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_file_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_symlink_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_symlink_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 __be32 vnode_id; 417 __be32 unique; 418 __be32 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 = htonl(vnode->fid.vnode); 428 key.unique = htonl(vnode->fid.unique); 429 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32); 430 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi); 431 afs_set_cache_aux(vnode, &aux); 432 433 vnode->cache = fscache_acquire_cookie( 434 vnode->volume->cache, 435 vnode->status.type == AFS_FTYPE_FILE ? 0 : FSCACHE_ADV_SINGLE_CHUNK, 436 &key, sizeof(key), 437 &aux, sizeof(aux), 438 vnode->status.size); 439 #endif 440 } 441 442 /* 443 * inode retrieval 444 */ 445 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 446 { 447 struct afs_vnode_param *dvp = &op->file[0]; 448 struct super_block *sb = dvp->vnode->vfs_inode.i_sb; 449 struct afs_vnode *vnode; 450 struct inode *inode; 451 int ret; 452 453 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 454 455 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 456 if (!inode) { 457 _leave(" = -ENOMEM"); 458 return ERR_PTR(-ENOMEM); 459 } 460 461 vnode = AFS_FS_I(inode); 462 463 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 464 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 465 466 /* deal with an existing inode */ 467 if (!(inode->i_state & I_NEW)) { 468 _leave(" = %p", inode); 469 return inode; 470 } 471 472 ret = afs_inode_init_from_status(op, vp, vnode); 473 if (ret < 0) 474 goto bad_inode; 475 476 afs_get_inode_cache(vnode); 477 478 /* success */ 479 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 480 unlock_new_inode(inode); 481 _leave(" = %p", inode); 482 return inode; 483 484 /* failure */ 485 bad_inode: 486 iget_failed(inode); 487 _leave(" = %d [bad]", ret); 488 return ERR_PTR(ret); 489 } 490 491 static int afs_iget5_set_root(struct inode *inode, void *opaque) 492 { 493 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 494 struct afs_vnode *vnode = AFS_FS_I(inode); 495 496 vnode->volume = as->volume; 497 vnode->fid.vid = as->volume->vid, 498 vnode->fid.vnode = 1; 499 vnode->fid.unique = 1; 500 inode->i_ino = 1; 501 inode->i_generation = 1; 502 return 0; 503 } 504 505 /* 506 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 507 * the volume. 508 */ 509 struct inode *afs_root_iget(struct super_block *sb, struct key *key) 510 { 511 struct afs_super_info *as = AFS_FS_S(sb); 512 struct afs_operation *op; 513 struct afs_vnode *vnode; 514 struct inode *inode; 515 int ret; 516 517 _enter(",{%llx},,", as->volume->vid); 518 519 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 520 if (!inode) { 521 _leave(" = -ENOMEM"); 522 return ERR_PTR(-ENOMEM); 523 } 524 525 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 526 527 BUG_ON(!(inode->i_state & I_NEW)); 528 529 vnode = AFS_FS_I(inode); 530 vnode->cb_v_break = as->volume->cb_v_break, 531 532 op = afs_alloc_operation(key, as->volume); 533 if (IS_ERR(op)) { 534 ret = PTR_ERR(op); 535 goto error; 536 } 537 538 afs_op_set_vnode(op, 0, vnode); 539 540 op->nr_files = 1; 541 op->ops = &afs_fetch_status_operation; 542 ret = afs_do_sync_operation(op); 543 if (ret < 0) 544 goto error; 545 546 afs_get_inode_cache(vnode); 547 548 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 549 unlock_new_inode(inode); 550 _leave(" = %p", inode); 551 return inode; 552 553 error: 554 iget_failed(inode); 555 _leave(" = %d [bad]", ret); 556 return ERR_PTR(ret); 557 } 558 559 /* 560 * mark the data attached to an inode as obsolete due to a write on the server 561 * - might also want to ditch all the outstanding writes and dirty pages 562 */ 563 static void afs_zap_data(struct afs_vnode *vnode) 564 { 565 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 566 567 afs_invalidate_cache(vnode, 0); 568 569 /* nuke all the non-dirty pages that aren't locked, mapped or being 570 * written back in a regular file and completely discard the pages in a 571 * directory or symlink */ 572 if (S_ISREG(vnode->vfs_inode.i_mode)) 573 invalidate_remote_inode(&vnode->vfs_inode); 574 else 575 invalidate_inode_pages2(vnode->vfs_inode.i_mapping); 576 } 577 578 /* 579 * Check to see if we have a server currently serving this volume and that it 580 * hasn't been reinitialised or dropped from the list. 581 */ 582 static bool afs_check_server_good(struct afs_vnode *vnode) 583 { 584 struct afs_server_list *slist; 585 struct afs_server *server; 586 bool good; 587 int i; 588 589 if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break)) 590 return true; 591 592 rcu_read_lock(); 593 594 slist = rcu_dereference(vnode->volume->servers); 595 for (i = 0; i < slist->nr_servers; i++) { 596 server = slist->servers[i].server; 597 if (server == vnode->cb_server) { 598 good = (vnode->cb_s_break == server->cb_s_break); 599 rcu_read_unlock(); 600 return good; 601 } 602 } 603 604 rcu_read_unlock(); 605 return false; 606 } 607 608 /* 609 * Check the validity of a vnode/inode. 610 */ 611 bool afs_check_validity(struct afs_vnode *vnode) 612 { 613 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 614 time64_t now = ktime_get_real_seconds(); 615 unsigned int cb_break; 616 int seq = 0; 617 618 do { 619 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 620 cb_break = vnode->cb_break; 621 622 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 623 if (vnode->cb_v_break != vnode->volume->cb_v_break) 624 need_clear = afs_cb_break_for_v_break; 625 else if (!afs_check_server_good(vnode)) 626 need_clear = afs_cb_break_for_s_reinit; 627 else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 628 need_clear = afs_cb_break_for_zap; 629 else if (vnode->cb_expires_at - 10 <= now) 630 need_clear = afs_cb_break_for_lapsed; 631 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 632 ; 633 } else { 634 need_clear = afs_cb_break_no_promise; 635 } 636 637 } while (need_seqretry(&vnode->cb_lock, seq)); 638 639 done_seqretry(&vnode->cb_lock, seq); 640 641 if (need_clear == afs_cb_break_no_break) 642 return true; 643 644 write_seqlock(&vnode->cb_lock); 645 if (need_clear == afs_cb_break_no_promise) 646 vnode->cb_v_break = vnode->volume->cb_v_break; 647 else if (cb_break == vnode->cb_break) 648 __afs_break_callback(vnode, need_clear); 649 else 650 trace_afs_cb_miss(&vnode->fid, need_clear); 651 write_sequnlock(&vnode->cb_lock); 652 return false; 653 } 654 655 /* 656 * validate a vnode/inode 657 * - there are several things we need to check 658 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 659 * symlink) 660 * - parent dir metadata changed (security changes) 661 * - dentry data changed (write, truncate) 662 * - dentry metadata changed (security changes) 663 */ 664 int afs_validate(struct afs_vnode *vnode, struct key *key) 665 { 666 int ret; 667 668 _enter("{v={%llx:%llu} fl=%lx},%x", 669 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 670 key_serial(key)); 671 672 if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) { 673 if (vnode->vfs_inode.i_nlink) 674 clear_nlink(&vnode->vfs_inode); 675 goto valid; 676 } 677 678 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 679 afs_check_validity(vnode)) 680 goto valid; 681 682 down_write(&vnode->validate_lock); 683 684 /* if the promise has expired, we need to check the server again to get 685 * a new promise - note that if the (parent) directory's metadata was 686 * changed then the security may be different and we may no longer have 687 * access */ 688 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 689 _debug("not promised"); 690 ret = afs_fetch_status(vnode, key, false, NULL); 691 if (ret < 0) { 692 if (ret == -ENOENT) { 693 set_bit(AFS_VNODE_DELETED, &vnode->flags); 694 ret = -ESTALE; 695 } 696 goto error_unlock; 697 } 698 _debug("new promise [fl=%lx]", vnode->flags); 699 } 700 701 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 702 _debug("file already deleted"); 703 ret = -ESTALE; 704 goto error_unlock; 705 } 706 707 /* if the vnode's data version number changed then its contents are 708 * different */ 709 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 710 afs_zap_data(vnode); 711 up_write(&vnode->validate_lock); 712 valid: 713 _leave(" = 0"); 714 return 0; 715 716 error_unlock: 717 up_write(&vnode->validate_lock); 718 _leave(" = %d", ret); 719 return ret; 720 } 721 722 /* 723 * read the attributes of an inode 724 */ 725 int afs_getattr(struct user_namespace *mnt_userns, const struct path *path, 726 struct kstat *stat, u32 request_mask, unsigned int query_flags) 727 { 728 struct inode *inode = d_inode(path->dentry); 729 struct afs_vnode *vnode = AFS_FS_I(inode); 730 int seq = 0; 731 732 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 733 734 do { 735 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 736 generic_fillattr(&init_user_ns, inode, stat); 737 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 738 stat->nlink > 0) 739 stat->nlink -= 1; 740 } while (need_seqretry(&vnode->cb_lock, seq)); 741 742 done_seqretry(&vnode->cb_lock, seq); 743 return 0; 744 } 745 746 /* 747 * discard an AFS inode 748 */ 749 int afs_drop_inode(struct inode *inode) 750 { 751 _enter(""); 752 753 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 754 return generic_delete_inode(inode); 755 else 756 return generic_drop_inode(inode); 757 } 758 759 /* 760 * clear an AFS inode 761 */ 762 void afs_evict_inode(struct inode *inode) 763 { 764 struct afs_vnode_cache_aux aux; 765 struct afs_vnode *vnode = AFS_FS_I(inode); 766 767 _enter("{%llx:%llu.%d}", 768 vnode->fid.vid, 769 vnode->fid.vnode, 770 vnode->fid.unique); 771 772 _debug("CLEAR INODE %p", inode); 773 774 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 775 776 truncate_inode_pages_final(&inode->i_data); 777 778 afs_set_cache_aux(vnode, &aux); 779 fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux); 780 clear_inode(inode); 781 782 while (!list_empty(&vnode->wb_keys)) { 783 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 784 struct afs_wb_key, vnode_link); 785 list_del(&wbk->vnode_link); 786 afs_put_wb_key(wbk); 787 } 788 789 #ifdef CONFIG_AFS_FSCACHE 790 fscache_relinquish_cookie(vnode->cache, 791 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 792 vnode->cache = NULL; 793 #endif 794 795 afs_prune_wb_keys(vnode); 796 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 797 key_put(vnode->silly_key); 798 vnode->silly_key = NULL; 799 key_put(vnode->lock_key); 800 vnode->lock_key = NULL; 801 _leave(""); 802 } 803 804 static void afs_setattr_success(struct afs_operation *op) 805 { 806 struct afs_vnode_param *vp = &op->file[0]; 807 struct inode *inode = &vp->vnode->vfs_inode; 808 loff_t old_i_size = i_size_read(inode); 809 810 op->setattr.old_i_size = old_i_size; 811 afs_vnode_commit_status(op, vp); 812 /* inode->i_size has now been changed. */ 813 814 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 815 loff_t size = op->setattr.attr->ia_size; 816 if (size > old_i_size) 817 pagecache_isize_extended(inode, old_i_size, size); 818 } 819 } 820 821 static void afs_setattr_edit_file(struct afs_operation *op) 822 { 823 struct afs_vnode_param *vp = &op->file[0]; 824 struct inode *inode = &vp->vnode->vfs_inode; 825 826 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 827 loff_t size = op->setattr.attr->ia_size; 828 loff_t i_size = op->setattr.old_i_size; 829 830 if (size < i_size) 831 truncate_pagecache(inode, size); 832 if (size != i_size) 833 fscache_resize_cookie(afs_vnode_cache(vp->vnode), 834 vp->scb.status.size); 835 } 836 } 837 838 static const struct afs_operation_ops afs_setattr_operation = { 839 .issue_afs_rpc = afs_fs_setattr, 840 .issue_yfs_rpc = yfs_fs_setattr, 841 .success = afs_setattr_success, 842 .edit_dir = afs_setattr_edit_file, 843 }; 844 845 /* 846 * set the attributes of an inode 847 */ 848 int afs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, 849 struct iattr *attr) 850 { 851 const unsigned int supported = 852 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 853 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH; 854 struct afs_operation *op; 855 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 856 struct inode *inode = &vnode->vfs_inode; 857 loff_t i_size; 858 int ret; 859 860 _enter("{%llx:%llu},{n=%pd},%x", 861 vnode->fid.vid, vnode->fid.vnode, dentry, 862 attr->ia_valid); 863 864 if (!(attr->ia_valid & supported)) { 865 _leave(" = 0 [unsupported]"); 866 return 0; 867 } 868 869 i_size = i_size_read(inode); 870 if (attr->ia_valid & ATTR_SIZE) { 871 if (!S_ISREG(inode->i_mode)) 872 return -EISDIR; 873 874 ret = inode_newsize_ok(inode, attr->ia_size); 875 if (ret) 876 return ret; 877 878 if (attr->ia_size == i_size) 879 attr->ia_valid &= ~ATTR_SIZE; 880 } 881 882 fscache_use_cookie(afs_vnode_cache(vnode), true); 883 884 /* Prevent any new writebacks from starting whilst we do this. */ 885 down_write(&vnode->validate_lock); 886 887 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) { 888 loff_t size = attr->ia_size; 889 890 /* Wait for any outstanding writes to the server to complete */ 891 loff_t from = min(size, i_size); 892 loff_t to = max(size, i_size); 893 ret = filemap_fdatawait_range(inode->i_mapping, from, to); 894 if (ret < 0) 895 goto out_unlock; 896 897 /* Don't talk to the server if we're just shortening in-memory 898 * writes that haven't gone to the server yet. 899 */ 900 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) && 901 attr->ia_size < i_size && 902 attr->ia_size > vnode->status.size) { 903 truncate_pagecache(inode, attr->ia_size); 904 fscache_resize_cookie(afs_vnode_cache(vnode), 905 attr->ia_size); 906 i_size_write(inode, attr->ia_size); 907 ret = 0; 908 goto out_unlock; 909 } 910 } 911 912 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 913 afs_file_key(attr->ia_file) : NULL), 914 vnode->volume); 915 if (IS_ERR(op)) { 916 ret = PTR_ERR(op); 917 goto out_unlock; 918 } 919 920 afs_op_set_vnode(op, 0, vnode); 921 op->setattr.attr = attr; 922 923 if (attr->ia_valid & ATTR_SIZE) { 924 op->file[0].dv_delta = 1; 925 op->file[0].set_size = true; 926 } 927 op->ctime = attr->ia_ctime; 928 op->file[0].update_ctime = 1; 929 op->file[0].modification = true; 930 931 op->ops = &afs_setattr_operation; 932 ret = afs_do_sync_operation(op); 933 934 out_unlock: 935 up_write(&vnode->validate_lock); 936 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL); 937 _leave(" = %d", ret); 938 return ret; 939 } 940