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 .listxattr = afs_listxattr, 31 }; 32 33 static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode) 34 { 35 static unsigned long once_only; 36 37 pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type); 38 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n", 39 vnode->status.abort_code, 40 vnode->status.mode, 41 vnode->status.size, 42 vnode->status.data_version); 43 pr_warn("kAFS: vnode %llx:%llx:%x\n", 44 vnode->fid.vid, 45 vnode->fid.vnode, 46 vnode->fid.unique); 47 if (parent_vnode) 48 pr_warn("kAFS: dir %llx:%llx:%x\n", 49 parent_vnode->fid.vid, 50 parent_vnode->fid.vnode, 51 parent_vnode->fid.unique); 52 53 if (!test_and_set_bit(0, &once_only)) 54 dump_stack(); 55 } 56 57 /* 58 * Set the file size and block count. Estimate the number of 512 bytes blocks 59 * used, rounded up to nearest 1K for consistency with other AFS clients. 60 */ 61 static void afs_set_i_size(struct afs_vnode *vnode, u64 size) 62 { 63 i_size_write(&vnode->vfs_inode, size); 64 vnode->vfs_inode.i_blocks = ((size + 1023) >> 10) << 1; 65 } 66 67 /* 68 * Initialise an inode from the vnode status. 69 */ 70 static int afs_inode_init_from_status(struct afs_operation *op, 71 struct afs_vnode_param *vp, 72 struct afs_vnode *vnode) 73 { 74 struct afs_file_status *status = &vp->scb.status; 75 struct inode *inode = AFS_VNODE_TO_I(vnode); 76 struct timespec64 t; 77 78 _enter("{%llx:%llu.%u} %s", 79 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 80 op->type ? op->type->name : "???"); 81 82 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", 83 status->type, 84 status->nlink, 85 (unsigned long long) status->size, 86 status->data_version, 87 status->mode); 88 89 write_seqlock(&vnode->cb_lock); 90 91 vnode->cb_v_break = op->cb_v_break; 92 vnode->cb_s_break = op->cb_s_break; 93 vnode->status = *status; 94 95 t = status->mtime_client; 96 inode->i_ctime = t; 97 inode->i_mtime = t; 98 inode->i_atime = t; 99 inode->i_flags |= S_NOATIME; 100 inode->i_uid = make_kuid(&init_user_ns, status->owner); 101 inode->i_gid = make_kgid(&init_user_ns, status->group); 102 set_nlink(&vnode->vfs_inode, status->nlink); 103 104 switch (status->type) { 105 case AFS_FTYPE_FILE: 106 inode->i_mode = S_IFREG | status->mode; 107 inode->i_op = &afs_file_inode_operations; 108 inode->i_fop = &afs_file_operations; 109 inode->i_mapping->a_ops = &afs_fs_aops; 110 break; 111 case AFS_FTYPE_DIR: 112 inode->i_mode = S_IFDIR | status->mode; 113 inode->i_op = &afs_dir_inode_operations; 114 inode->i_fop = &afs_dir_file_operations; 115 inode->i_mapping->a_ops = &afs_dir_aops; 116 break; 117 case AFS_FTYPE_SYMLINK: 118 /* Symlinks with a mode of 0644 are actually mountpoints. */ 119 if ((status->mode & 0777) == 0644) { 120 inode->i_flags |= S_AUTOMOUNT; 121 122 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 123 124 inode->i_mode = S_IFDIR | 0555; 125 inode->i_op = &afs_mntpt_inode_operations; 126 inode->i_fop = &afs_mntpt_file_operations; 127 inode->i_mapping->a_ops = &afs_fs_aops; 128 } else { 129 inode->i_mode = S_IFLNK | status->mode; 130 inode->i_op = &afs_symlink_inode_operations; 131 inode->i_mapping->a_ops = &afs_fs_aops; 132 } 133 inode_nohighmem(inode); 134 break; 135 default: 136 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL); 137 write_sequnlock(&vnode->cb_lock); 138 return afs_protocol_error(NULL, afs_eproto_file_type); 139 } 140 141 afs_set_i_size(vnode, status->size); 142 143 vnode->invalid_before = status->data_version; 144 inode_set_iversion_raw(&vnode->vfs_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->vfs_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; 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\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 : "???"); 223 224 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->dv_before + vp->dv_delta != vp->scb.status.data_version && 298 vp->speculative) 299 /* Ignore the result of a speculative bulk status fetch 300 * if it splits around a modification op, thereby 301 * appearing to regress the data version. 302 */ 303 goto out; 304 afs_apply_status(op, vp); 305 if (vp->scb.have_cb) 306 afs_apply_callback(op, vp); 307 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) { 308 drop_nlink(&vnode->vfs_inode); 309 if (vnode->vfs_inode.i_nlink == 0) { 310 set_bit(AFS_VNODE_DELETED, &vnode->flags); 311 __afs_break_callback(vnode, afs_cb_break_for_deleted); 312 } 313 } 314 315 out: 316 write_sequnlock(&vnode->cb_lock); 317 318 if (vp->scb.have_status) 319 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 320 } 321 322 static void afs_fetch_status_success(struct afs_operation *op) 323 { 324 struct afs_vnode_param *vp = &op->file[op->fetch_status.which]; 325 struct afs_vnode *vnode = vp->vnode; 326 int ret; 327 328 if (vnode->vfs_inode.i_state & I_NEW) { 329 ret = afs_inode_init_from_status(op, vp, vnode); 330 op->error = ret; 331 if (ret == 0) 332 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 333 } else { 334 afs_vnode_commit_status(op, vp); 335 } 336 } 337 338 const struct afs_operation_ops afs_fetch_status_operation = { 339 .issue_afs_rpc = afs_fs_fetch_status, 340 .issue_yfs_rpc = yfs_fs_fetch_status, 341 .success = afs_fetch_status_success, 342 .aborted = afs_check_for_remote_deletion, 343 }; 344 345 /* 346 * Fetch file status from the volume. 347 */ 348 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, 349 afs_access_t *_caller_access) 350 { 351 struct afs_operation *op; 352 353 _enter("%s,{%llx:%llu.%u,S=%lx}", 354 vnode->volume->name, 355 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, 356 vnode->flags); 357 358 op = afs_alloc_operation(key, vnode->volume); 359 if (IS_ERR(op)) 360 return PTR_ERR(op); 361 362 afs_op_set_vnode(op, 0, vnode); 363 364 op->nr_files = 1; 365 op->ops = &afs_fetch_status_operation; 366 afs_begin_vnode_operation(op); 367 afs_wait_for_operation(op); 368 369 if (_caller_access) 370 *_caller_access = op->file[0].scb.status.caller_access; 371 return afs_put_operation(op); 372 } 373 374 /* 375 * ilookup() comparator 376 */ 377 int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque) 378 { 379 struct afs_vnode *vnode = AFS_FS_I(inode); 380 struct afs_fid *fid = opaque; 381 382 return (fid->vnode == vnode->fid.vnode && 383 fid->vnode_hi == vnode->fid.vnode_hi && 384 fid->unique == vnode->fid.unique); 385 } 386 387 /* 388 * iget5() comparator 389 */ 390 static int afs_iget5_test(struct inode *inode, void *opaque) 391 { 392 struct afs_vnode_param *vp = opaque; 393 //struct afs_vnode *vnode = AFS_FS_I(inode); 394 395 return afs_ilookup5_test_by_fid(inode, &vp->fid); 396 } 397 398 /* 399 * iget5() inode initialiser 400 */ 401 static int afs_iget5_set(struct inode *inode, void *opaque) 402 { 403 struct afs_vnode_param *vp = opaque; 404 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 405 struct afs_vnode *vnode = AFS_FS_I(inode); 406 407 vnode->volume = as->volume; 408 vnode->fid = vp->fid; 409 410 /* YFS supports 96-bit vnode IDs, but Linux only supports 411 * 64-bit inode numbers. 412 */ 413 inode->i_ino = vnode->fid.vnode; 414 inode->i_generation = vnode->fid.unique; 415 return 0; 416 } 417 418 /* 419 * Get a cache cookie for an inode. 420 */ 421 static void afs_get_inode_cache(struct afs_vnode *vnode) 422 { 423 #ifdef CONFIG_AFS_FSCACHE 424 struct { 425 u32 vnode_id; 426 u32 unique; 427 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */ 428 } __packed key; 429 struct afs_vnode_cache_aux aux; 430 431 if (vnode->status.type == AFS_FTYPE_DIR) { 432 vnode->cache = NULL; 433 return; 434 } 435 436 key.vnode_id = vnode->fid.vnode; 437 key.unique = vnode->fid.unique; 438 key.vnode_id_ext[0] = vnode->fid.vnode >> 32; 439 key.vnode_id_ext[1] = vnode->fid.vnode_hi; 440 aux.data_version = vnode->status.data_version; 441 442 vnode->cache = fscache_acquire_cookie(vnode->volume->cache, 443 &afs_vnode_cache_index_def, 444 &key, sizeof(key), 445 &aux, sizeof(aux), 446 vnode, vnode->status.size, true); 447 #endif 448 } 449 450 /* 451 * inode retrieval 452 */ 453 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 454 { 455 struct afs_vnode_param *dvp = &op->file[0]; 456 struct super_block *sb = dvp->vnode->vfs_inode.i_sb; 457 struct afs_vnode *vnode; 458 struct inode *inode; 459 int ret; 460 461 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 462 463 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 464 if (!inode) { 465 _leave(" = -ENOMEM"); 466 return ERR_PTR(-ENOMEM); 467 } 468 469 vnode = AFS_FS_I(inode); 470 471 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 472 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 473 474 /* deal with an existing inode */ 475 if (!(inode->i_state & I_NEW)) { 476 _leave(" = %p", inode); 477 return inode; 478 } 479 480 ret = afs_inode_init_from_status(op, vp, vnode); 481 if (ret < 0) 482 goto bad_inode; 483 484 afs_get_inode_cache(vnode); 485 486 /* success */ 487 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 488 unlock_new_inode(inode); 489 _leave(" = %p", inode); 490 return inode; 491 492 /* failure */ 493 bad_inode: 494 iget_failed(inode); 495 _leave(" = %d [bad]", ret); 496 return ERR_PTR(ret); 497 } 498 499 static int afs_iget5_set_root(struct inode *inode, void *opaque) 500 { 501 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 502 struct afs_vnode *vnode = AFS_FS_I(inode); 503 504 vnode->volume = as->volume; 505 vnode->fid.vid = as->volume->vid, 506 vnode->fid.vnode = 1; 507 vnode->fid.unique = 1; 508 inode->i_ino = 1; 509 inode->i_generation = 1; 510 return 0; 511 } 512 513 /* 514 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 515 * the volume. 516 */ 517 struct inode *afs_root_iget(struct super_block *sb, struct key *key) 518 { 519 struct afs_super_info *as = AFS_FS_S(sb); 520 struct afs_operation *op; 521 struct afs_vnode *vnode; 522 struct inode *inode; 523 int ret; 524 525 _enter(",{%llx},,", as->volume->vid); 526 527 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 528 if (!inode) { 529 _leave(" = -ENOMEM"); 530 return ERR_PTR(-ENOMEM); 531 } 532 533 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 534 535 BUG_ON(!(inode->i_state & I_NEW)); 536 537 vnode = AFS_FS_I(inode); 538 vnode->cb_v_break = as->volume->cb_v_break, 539 540 op = afs_alloc_operation(key, as->volume); 541 if (IS_ERR(op)) { 542 ret = PTR_ERR(op); 543 goto error; 544 } 545 546 afs_op_set_vnode(op, 0, vnode); 547 548 op->nr_files = 1; 549 op->ops = &afs_fetch_status_operation; 550 ret = afs_do_sync_operation(op); 551 if (ret < 0) 552 goto error; 553 554 afs_get_inode_cache(vnode); 555 556 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 557 unlock_new_inode(inode); 558 _leave(" = %p", inode); 559 return inode; 560 561 error: 562 iget_failed(inode); 563 _leave(" = %d [bad]", ret); 564 return ERR_PTR(ret); 565 } 566 567 /* 568 * mark the data attached to an inode as obsolete due to a write on the server 569 * - might also want to ditch all the outstanding writes and dirty pages 570 */ 571 static void afs_zap_data(struct afs_vnode *vnode) 572 { 573 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 574 575 #ifdef CONFIG_AFS_FSCACHE 576 fscache_invalidate(vnode->cache); 577 #endif 578 579 /* nuke all the non-dirty pages that aren't locked, mapped or being 580 * written back in a regular file and completely discard the pages in a 581 * directory or symlink */ 582 if (S_ISREG(vnode->vfs_inode.i_mode)) 583 invalidate_remote_inode(&vnode->vfs_inode); 584 else 585 invalidate_inode_pages2(vnode->vfs_inode.i_mapping); 586 } 587 588 /* 589 * Get the server reinit counter for a vnode's current server. 590 */ 591 static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break) 592 { 593 struct afs_server_list *slist = rcu_dereference(vnode->volume->servers); 594 struct afs_server *server; 595 int i; 596 597 for (i = 0; i < slist->nr_servers; i++) { 598 server = slist->servers[i].server; 599 if (server == vnode->cb_server) { 600 *_s_break = READ_ONCE(server->cb_s_break); 601 return true; 602 } 603 } 604 605 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 struct afs_volume *volume = vnode->volume; 614 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 615 time64_t now = ktime_get_real_seconds(); 616 bool valid; 617 unsigned int cb_break, cb_s_break, cb_v_break; 618 int seq = 0; 619 620 do { 621 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 622 cb_v_break = READ_ONCE(volume->cb_v_break); 623 cb_break = vnode->cb_break; 624 625 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 626 afs_get_s_break_rcu(vnode, &cb_s_break)) { 627 if (vnode->cb_s_break != cb_s_break || 628 vnode->cb_v_break != cb_v_break) { 629 vnode->cb_s_break = cb_s_break; 630 vnode->cb_v_break = cb_v_break; 631 need_clear = afs_cb_break_for_vsbreak; 632 valid = false; 633 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { 634 need_clear = afs_cb_break_for_zap; 635 valid = false; 636 } else if (vnode->cb_expires_at - 10 <= now) { 637 need_clear = afs_cb_break_for_lapsed; 638 valid = false; 639 } else { 640 valid = true; 641 } 642 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 643 valid = true; 644 } else { 645 vnode->cb_v_break = cb_v_break; 646 valid = false; 647 } 648 649 } while (need_seqretry(&vnode->cb_lock, seq)); 650 651 done_seqretry(&vnode->cb_lock, seq); 652 653 if (need_clear != afs_cb_break_no_break) { 654 write_seqlock(&vnode->cb_lock); 655 if (cb_break == vnode->cb_break) 656 __afs_break_callback(vnode, need_clear); 657 else 658 trace_afs_cb_miss(&vnode->fid, need_clear); 659 write_sequnlock(&vnode->cb_lock); 660 valid = false; 661 } 662 663 return valid; 664 } 665 666 /* 667 * validate a vnode/inode 668 * - there are several things we need to check 669 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 670 * symlink) 671 * - parent dir metadata changed (security changes) 672 * - dentry data changed (write, truncate) 673 * - dentry metadata changed (security changes) 674 */ 675 int afs_validate(struct afs_vnode *vnode, struct key *key) 676 { 677 bool valid; 678 int ret; 679 680 _enter("{v={%llx:%llu} fl=%lx},%x", 681 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 682 key_serial(key)); 683 684 rcu_read_lock(); 685 valid = afs_check_validity(vnode); 686 rcu_read_unlock(); 687 688 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 689 clear_nlink(&vnode->vfs_inode); 690 691 if (valid) 692 goto valid; 693 694 down_write(&vnode->validate_lock); 695 696 /* if the promise has expired, we need to check the server again to get 697 * a new promise - note that if the (parent) directory's metadata was 698 * changed then the security may be different and we may no longer have 699 * access */ 700 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 701 _debug("not promised"); 702 ret = afs_fetch_status(vnode, key, false, NULL); 703 if (ret < 0) { 704 if (ret == -ENOENT) { 705 set_bit(AFS_VNODE_DELETED, &vnode->flags); 706 ret = -ESTALE; 707 } 708 goto error_unlock; 709 } 710 _debug("new promise [fl=%lx]", vnode->flags); 711 } 712 713 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 714 _debug("file already deleted"); 715 ret = -ESTALE; 716 goto error_unlock; 717 } 718 719 /* if the vnode's data version number changed then its contents are 720 * different */ 721 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 722 afs_zap_data(vnode); 723 up_write(&vnode->validate_lock); 724 valid: 725 _leave(" = 0"); 726 return 0; 727 728 error_unlock: 729 up_write(&vnode->validate_lock); 730 _leave(" = %d", ret); 731 return ret; 732 } 733 734 /* 735 * read the attributes of an inode 736 */ 737 int afs_getattr(const struct path *path, struct kstat *stat, 738 u32 request_mask, unsigned int query_flags) 739 { 740 struct inode *inode = d_inode(path->dentry); 741 struct afs_vnode *vnode = AFS_FS_I(inode); 742 int seq = 0; 743 744 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 745 746 do { 747 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 748 generic_fillattr(inode, stat); 749 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 750 stat->nlink > 0) 751 stat->nlink -= 1; 752 } while (need_seqretry(&vnode->cb_lock, seq)); 753 754 done_seqretry(&vnode->cb_lock, seq); 755 return 0; 756 } 757 758 /* 759 * discard an AFS inode 760 */ 761 int afs_drop_inode(struct inode *inode) 762 { 763 _enter(""); 764 765 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 766 return generic_delete_inode(inode); 767 else 768 return generic_drop_inode(inode); 769 } 770 771 /* 772 * clear an AFS inode 773 */ 774 void afs_evict_inode(struct inode *inode) 775 { 776 struct afs_vnode *vnode; 777 778 vnode = AFS_FS_I(inode); 779 780 _enter("{%llx:%llu.%d}", 781 vnode->fid.vid, 782 vnode->fid.vnode, 783 vnode->fid.unique); 784 785 _debug("CLEAR INODE %p", inode); 786 787 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 788 789 truncate_inode_pages_final(&inode->i_data); 790 clear_inode(inode); 791 792 while (!list_empty(&vnode->wb_keys)) { 793 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 794 struct afs_wb_key, vnode_link); 795 list_del(&wbk->vnode_link); 796 afs_put_wb_key(wbk); 797 } 798 799 #ifdef CONFIG_AFS_FSCACHE 800 { 801 struct afs_vnode_cache_aux aux; 802 803 aux.data_version = vnode->status.data_version; 804 fscache_relinquish_cookie(vnode->cache, &aux, 805 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 806 vnode->cache = NULL; 807 } 808 #endif 809 810 afs_prune_wb_keys(vnode); 811 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 812 key_put(vnode->silly_key); 813 vnode->silly_key = NULL; 814 key_put(vnode->lock_key); 815 vnode->lock_key = NULL; 816 _leave(""); 817 } 818 819 static void afs_setattr_success(struct afs_operation *op) 820 { 821 struct afs_vnode_param *vp = &op->file[0]; 822 struct inode *inode = &vp->vnode->vfs_inode; 823 loff_t old_i_size = i_size_read(inode); 824 825 op->setattr.old_i_size = old_i_size; 826 afs_vnode_commit_status(op, vp); 827 /* inode->i_size has now been changed. */ 828 829 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 830 loff_t size = op->setattr.attr->ia_size; 831 if (size > old_i_size) 832 pagecache_isize_extended(inode, old_i_size, size); 833 } 834 } 835 836 static void afs_setattr_edit_file(struct afs_operation *op) 837 { 838 struct afs_vnode_param *vp = &op->file[0]; 839 struct inode *inode = &vp->vnode->vfs_inode; 840 841 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 842 loff_t size = op->setattr.attr->ia_size; 843 loff_t i_size = op->setattr.old_i_size; 844 845 if (size < i_size) 846 truncate_pagecache(inode, size); 847 } 848 } 849 850 static const struct afs_operation_ops afs_setattr_operation = { 851 .issue_afs_rpc = afs_fs_setattr, 852 .issue_yfs_rpc = yfs_fs_setattr, 853 .success = afs_setattr_success, 854 .edit_dir = afs_setattr_edit_file, 855 }; 856 857 /* 858 * set the attributes of an inode 859 */ 860 int afs_setattr(struct dentry *dentry, struct iattr *attr) 861 { 862 struct afs_operation *op; 863 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 864 int ret; 865 866 _enter("{%llx:%llu},{n=%pd},%x", 867 vnode->fid.vid, vnode->fid.vnode, dentry, 868 attr->ia_valid); 869 870 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 871 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | 872 ATTR_TOUCH))) { 873 _leave(" = 0 [unsupported]"); 874 return 0; 875 } 876 877 if (attr->ia_valid & ATTR_SIZE) { 878 if (!S_ISREG(vnode->vfs_inode.i_mode)) 879 return -EISDIR; 880 881 ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size); 882 if (ret) 883 return ret; 884 885 if (attr->ia_size == i_size_read(&vnode->vfs_inode)) 886 attr->ia_valid &= ~ATTR_SIZE; 887 } 888 889 /* flush any dirty data outstanding on a regular file */ 890 if (S_ISREG(vnode->vfs_inode.i_mode)) 891 filemap_write_and_wait(vnode->vfs_inode.i_mapping); 892 893 /* Prevent any new writebacks from starting whilst we do this. */ 894 down_write(&vnode->validate_lock); 895 896 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 897 afs_file_key(attr->ia_file) : NULL), 898 vnode->volume); 899 if (IS_ERR(op)) { 900 ret = PTR_ERR(op); 901 goto out_unlock; 902 } 903 904 afs_op_set_vnode(op, 0, vnode); 905 op->setattr.attr = attr; 906 907 if (attr->ia_valid & ATTR_SIZE) { 908 op->file[0].dv_delta = 1; 909 op->file[0].set_size = true; 910 } 911 op->ctime = attr->ia_ctime; 912 op->file[0].update_ctime = 1; 913 914 op->ops = &afs_setattr_operation; 915 ret = afs_do_sync_operation(op); 916 917 out_unlock: 918 up_write(&vnode->validate_lock); 919 _leave(" = %d", ret); 920 return ret; 921 } 922