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", 38 vnode->status.type); 39 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n", 40 vnode->status.abort_code, 41 vnode->status.mode, 42 vnode->status.size, 43 vnode->status.data_version); 44 pr_warn("kAFS: vnode %llx:%llx:%x\n", 45 vnode->fid.vid, 46 vnode->fid.vnode, 47 vnode->fid.unique); 48 if (parent_vnode) 49 pr_warn("kAFS: dir %llx:%llx:%x\n", 50 parent_vnode->fid.vid, 51 parent_vnode->fid.vnode, 52 parent_vnode->fid.unique); 53 54 if (!test_and_set_bit(0, &once_only)) 55 dump_stack(); 56 } 57 58 /* 59 * Initialise an inode from the vnode status. 60 */ 61 static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key, 62 struct afs_cb_interest *cbi, 63 struct afs_vnode *parent_vnode, 64 struct afs_status_cb *scb) 65 { 66 struct afs_cb_interest *old_cbi = NULL; 67 struct afs_file_status *status = &scb->status; 68 struct inode *inode = AFS_VNODE_TO_I(vnode); 69 struct timespec64 t; 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->status = *status; 81 82 t = status->mtime_client; 83 inode->i_ctime = t; 84 inode->i_mtime = t; 85 inode->i_atime = t; 86 inode->i_uid = make_kuid(&init_user_ns, status->owner); 87 inode->i_gid = make_kgid(&init_user_ns, status->group); 88 set_nlink(&vnode->vfs_inode, status->nlink); 89 90 switch (status->type) { 91 case AFS_FTYPE_FILE: 92 inode->i_mode = S_IFREG | status->mode; 93 inode->i_op = &afs_file_inode_operations; 94 inode->i_fop = &afs_file_operations; 95 inode->i_mapping->a_ops = &afs_fs_aops; 96 break; 97 case AFS_FTYPE_DIR: 98 inode->i_mode = S_IFDIR | status->mode; 99 inode->i_op = &afs_dir_inode_operations; 100 inode->i_fop = &afs_dir_file_operations; 101 inode->i_mapping->a_ops = &afs_dir_aops; 102 break; 103 case AFS_FTYPE_SYMLINK: 104 /* Symlinks with a mode of 0644 are actually mountpoints. */ 105 if ((status->mode & 0777) == 0644) { 106 inode->i_flags |= S_AUTOMOUNT; 107 108 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 109 110 inode->i_mode = S_IFDIR | 0555; 111 inode->i_op = &afs_mntpt_inode_operations; 112 inode->i_fop = &afs_mntpt_file_operations; 113 inode->i_mapping->a_ops = &afs_fs_aops; 114 } else { 115 inode->i_mode = S_IFLNK | status->mode; 116 inode->i_op = &afs_symlink_inode_operations; 117 inode->i_mapping->a_ops = &afs_fs_aops; 118 } 119 inode_nohighmem(inode); 120 break; 121 default: 122 dump_vnode(vnode, parent_vnode); 123 write_sequnlock(&vnode->cb_lock); 124 return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type); 125 } 126 127 /* 128 * Estimate 512 bytes blocks used, rounded up to nearest 1K 129 * for consistency with other AFS clients. 130 */ 131 inode->i_blocks = ((i_size_read(inode) + 1023) >> 10) << 1; 132 i_size_write(&vnode->vfs_inode, status->size); 133 134 vnode->invalid_before = status->data_version; 135 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); 136 137 if (!scb->have_cb) { 138 /* it's a symlink we just created (the fileserver 139 * didn't give us a callback) */ 140 vnode->cb_expires_at = ktime_get_real_seconds(); 141 } else { 142 vnode->cb_expires_at = scb->callback.expires_at; 143 old_cbi = rcu_dereference_protected(vnode->cb_interest, 144 lockdep_is_held(&vnode->cb_lock.lock)); 145 if (cbi != old_cbi) 146 rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(cbi)); 147 else 148 old_cbi = NULL; 149 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 150 } 151 152 write_sequnlock(&vnode->cb_lock); 153 afs_put_cb_interest(afs_v2net(vnode), old_cbi); 154 return 0; 155 } 156 157 /* 158 * Update the core inode struct from a returned status record. 159 */ 160 static void afs_apply_status(struct afs_fs_cursor *fc, 161 struct afs_vnode *vnode, 162 struct afs_status_cb *scb, 163 const afs_dataversion_t *expected_version) 164 { 165 struct afs_file_status *status = &scb->status; 166 struct timespec64 t; 167 umode_t mode; 168 bool data_changed = false; 169 170 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); 171 172 if (status->type != vnode->status.type) { 173 pr_warning("Vnode %llx:%llx:%x changed type %u to %u\n", 174 vnode->fid.vid, 175 vnode->fid.vnode, 176 vnode->fid.unique, 177 status->type, vnode->status.type); 178 afs_protocol_error(NULL, -EBADMSG, afs_eproto_bad_status); 179 return; 180 } 181 182 if (status->nlink != vnode->status.nlink) 183 set_nlink(&vnode->vfs_inode, status->nlink); 184 185 if (status->owner != vnode->status.owner) 186 vnode->vfs_inode.i_uid = make_kuid(&init_user_ns, status->owner); 187 188 if (status->group != vnode->status.group) 189 vnode->vfs_inode.i_gid = make_kgid(&init_user_ns, status->group); 190 191 if (status->mode != vnode->status.mode) { 192 mode = vnode->vfs_inode.i_mode; 193 mode &= ~S_IALLUGO; 194 mode |= status->mode; 195 WRITE_ONCE(vnode->vfs_inode.i_mode, mode); 196 } 197 198 t = status->mtime_client; 199 vnode->vfs_inode.i_ctime = t; 200 vnode->vfs_inode.i_mtime = t; 201 vnode->vfs_inode.i_atime = t; 202 203 if (vnode->status.data_version != status->data_version) 204 data_changed = true; 205 206 vnode->status = *status; 207 208 if (expected_version && 209 *expected_version != status->data_version) { 210 kdebug("vnode modified %llx on {%llx:%llu} [exp %llx] %s", 211 (unsigned long long) status->data_version, 212 vnode->fid.vid, vnode->fid.vnode, 213 (unsigned long long) *expected_version, 214 fc->type ? fc->type->name : "???"); 215 vnode->invalid_before = status->data_version; 216 if (vnode->status.type == AFS_FTYPE_DIR) { 217 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 218 afs_stat_v(vnode, n_inval); 219 } else { 220 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 221 } 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 } 230 231 if (data_changed) { 232 inode_set_iversion_raw(&vnode->vfs_inode, status->data_version); 233 i_size_write(&vnode->vfs_inode, status->size); 234 } 235 } 236 237 /* 238 * Apply a callback to a vnode. 239 */ 240 static void afs_apply_callback(struct afs_fs_cursor *fc, 241 struct afs_vnode *vnode, 242 struct afs_status_cb *scb, 243 unsigned int cb_break) 244 { 245 struct afs_cb_interest *old; 246 struct afs_callback *cb = &scb->callback; 247 248 if (!afs_cb_is_broken(cb_break, vnode, fc->cbi)) { 249 vnode->cb_expires_at = cb->expires_at; 250 old = rcu_dereference_protected(vnode->cb_interest, 251 lockdep_is_held(&vnode->cb_lock.lock)); 252 if (old != fc->cbi) { 253 rcu_assign_pointer(vnode->cb_interest, afs_get_cb_interest(fc->cbi)); 254 afs_put_cb_interest(afs_v2net(vnode), old); 255 } 256 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 257 } 258 } 259 260 /* 261 * Apply the received status and callback to an inode all in the same critical 262 * section to avoid races with afs_validate(). 263 */ 264 void afs_vnode_commit_status(struct afs_fs_cursor *fc, 265 struct afs_vnode *vnode, 266 unsigned int cb_break, 267 const afs_dataversion_t *expected_version, 268 struct afs_status_cb *scb) 269 { 270 if (fc->ac.error != 0) 271 return; 272 273 write_seqlock(&vnode->cb_lock); 274 275 if (scb->have_error) { 276 if (scb->status.abort_code == VNOVNODE) { 277 set_bit(AFS_VNODE_DELETED, &vnode->flags); 278 clear_nlink(&vnode->vfs_inode); 279 __afs_break_callback(vnode); 280 } 281 } else { 282 if (scb->have_status) 283 afs_apply_status(fc, vnode, scb, expected_version); 284 if (scb->have_cb) 285 afs_apply_callback(fc, vnode, scb, cb_break); 286 } 287 288 write_sequnlock(&vnode->cb_lock); 289 290 if (fc->ac.error == 0 && scb->have_status) 291 afs_cache_permit(vnode, fc->key, cb_break, scb); 292 } 293 294 /* 295 * Fetch file status from the volume. 296 */ 297 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, 298 afs_access_t *_caller_access) 299 { 300 struct afs_status_cb *scb; 301 struct afs_fs_cursor fc; 302 int ret; 303 304 _enter("%s,{%llx:%llu.%u,S=%lx}", 305 vnode->volume->name, 306 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, 307 vnode->flags); 308 309 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); 310 if (!scb) 311 return -ENOMEM; 312 313 ret = -ERESTARTSYS; 314 if (afs_begin_vnode_operation(&fc, vnode, key, true)) { 315 afs_dataversion_t data_version = vnode->status.data_version; 316 317 while (afs_select_fileserver(&fc)) { 318 fc.cb_break = afs_calc_vnode_cb_break(vnode); 319 afs_fs_fetch_file_status(&fc, scb, NULL); 320 } 321 322 if (fc.error) { 323 /* Do nothing. */ 324 } else if (is_new) { 325 ret = afs_inode_init_from_status(vnode, key, fc.cbi, 326 NULL, scb); 327 fc.error = ret; 328 if (ret == 0) 329 afs_cache_permit(vnode, key, fc.cb_break, scb); 330 } else { 331 afs_vnode_commit_status(&fc, vnode, fc.cb_break, 332 &data_version, scb); 333 } 334 afs_check_for_remote_deletion(&fc, vnode); 335 ret = afs_end_vnode_operation(&fc); 336 } 337 338 if (ret == 0 && _caller_access) 339 *_caller_access = scb->status.caller_access; 340 kfree(scb); 341 _leave(" = %d", ret); 342 return ret; 343 } 344 345 /* 346 * iget5() comparator 347 */ 348 int afs_iget5_test(struct inode *inode, void *opaque) 349 { 350 struct afs_iget_data *iget_data = opaque; 351 struct afs_vnode *vnode = AFS_FS_I(inode); 352 353 return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0; 354 } 355 356 /* 357 * iget5() comparator for inode created by autocell operations 358 * 359 * These pseudo inodes don't match anything. 360 */ 361 static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque) 362 { 363 return 0; 364 } 365 366 /* 367 * iget5() inode initialiser 368 */ 369 static int afs_iget5_set(struct inode *inode, void *opaque) 370 { 371 struct afs_iget_data *iget_data = opaque; 372 struct afs_vnode *vnode = AFS_FS_I(inode); 373 374 vnode->fid = iget_data->fid; 375 vnode->volume = iget_data->volume; 376 vnode->cb_v_break = iget_data->cb_v_break; 377 vnode->cb_s_break = iget_data->cb_s_break; 378 379 /* YFS supports 96-bit vnode IDs, but Linux only supports 380 * 64-bit inode numbers. 381 */ 382 inode->i_ino = iget_data->fid.vnode; 383 inode->i_generation = iget_data->fid.unique; 384 return 0; 385 } 386 387 /* 388 * Create an inode for a dynamic root directory or an autocell dynamic 389 * automount dir. 390 */ 391 struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root) 392 { 393 struct afs_super_info *as; 394 struct afs_vnode *vnode; 395 struct inode *inode; 396 static atomic_t afs_autocell_ino; 397 398 struct afs_iget_data iget_data = { 399 .cb_v_break = 0, 400 .cb_s_break = 0, 401 }; 402 403 _enter(""); 404 405 as = sb->s_fs_info; 406 if (as->volume) { 407 iget_data.volume = as->volume; 408 iget_data.fid.vid = as->volume->vid; 409 } 410 if (root) { 411 iget_data.fid.vnode = 1; 412 iget_data.fid.unique = 1; 413 } else { 414 iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino); 415 iget_data.fid.unique = 0; 416 } 417 418 inode = iget5_locked(sb, iget_data.fid.vnode, 419 afs_iget5_pseudo_dir_test, afs_iget5_set, 420 &iget_data); 421 if (!inode) { 422 _leave(" = -ENOMEM"); 423 return ERR_PTR(-ENOMEM); 424 } 425 426 _debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }", 427 inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode, 428 iget_data.fid.unique); 429 430 vnode = AFS_FS_I(inode); 431 432 /* there shouldn't be an existing inode */ 433 BUG_ON(!(inode->i_state & I_NEW)); 434 435 inode->i_size = 0; 436 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; 437 if (root) { 438 inode->i_op = &afs_dynroot_inode_operations; 439 inode->i_fop = &afs_dynroot_file_operations; 440 } else { 441 inode->i_op = &afs_autocell_inode_operations; 442 } 443 set_nlink(inode, 2); 444 inode->i_uid = GLOBAL_ROOT_UID; 445 inode->i_gid = GLOBAL_ROOT_GID; 446 inode->i_ctime = inode->i_atime = inode->i_mtime = current_time(inode); 447 inode->i_blocks = 0; 448 inode_set_iversion_raw(inode, 0); 449 inode->i_generation = 0; 450 451 set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags); 452 if (!root) { 453 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 454 inode->i_flags |= S_AUTOMOUNT; 455 } 456 457 inode->i_flags |= S_NOATIME; 458 unlock_new_inode(inode); 459 _leave(" = %p", inode); 460 return inode; 461 } 462 463 /* 464 * Get a cache cookie for an inode. 465 */ 466 static void afs_get_inode_cache(struct afs_vnode *vnode) 467 { 468 #ifdef CONFIG_AFS_FSCACHE 469 struct { 470 u32 vnode_id; 471 u32 unique; 472 u32 vnode_id_ext[2]; /* Allow for a 96-bit key */ 473 } __packed key; 474 struct afs_vnode_cache_aux aux; 475 476 if (vnode->status.type == AFS_FTYPE_DIR) { 477 vnode->cache = NULL; 478 return; 479 } 480 481 key.vnode_id = vnode->fid.vnode; 482 key.unique = vnode->fid.unique; 483 key.vnode_id_ext[0] = vnode->fid.vnode >> 32; 484 key.vnode_id_ext[1] = vnode->fid.vnode_hi; 485 aux.data_version = vnode->status.data_version; 486 487 vnode->cache = fscache_acquire_cookie(vnode->volume->cache, 488 &afs_vnode_cache_index_def, 489 &key, sizeof(key), 490 &aux, sizeof(aux), 491 vnode, vnode->status.size, true); 492 #endif 493 } 494 495 /* 496 * inode retrieval 497 */ 498 struct inode *afs_iget(struct super_block *sb, struct key *key, 499 struct afs_iget_data *iget_data, 500 struct afs_status_cb *scb, 501 struct afs_cb_interest *cbi, 502 struct afs_vnode *parent_vnode) 503 { 504 struct afs_super_info *as; 505 struct afs_vnode *vnode; 506 struct afs_fid *fid = &iget_data->fid; 507 struct inode *inode; 508 int ret; 509 510 _enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique); 511 512 as = sb->s_fs_info; 513 iget_data->volume = as->volume; 514 515 inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, 516 iget_data); 517 if (!inode) { 518 _leave(" = -ENOMEM"); 519 return ERR_PTR(-ENOMEM); 520 } 521 522 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 523 inode, fid->vid, fid->vnode, fid->unique); 524 525 vnode = AFS_FS_I(inode); 526 527 /* deal with an existing inode */ 528 if (!(inode->i_state & I_NEW)) { 529 _leave(" = %p", inode); 530 return inode; 531 } 532 533 if (!scb) { 534 /* it's a remotely extant inode */ 535 ret = afs_fetch_status(vnode, key, true, NULL); 536 if (ret < 0) 537 goto bad_inode; 538 } else { 539 ret = afs_inode_init_from_status(vnode, key, cbi, parent_vnode, 540 scb); 541 if (ret < 0) 542 goto bad_inode; 543 } 544 545 afs_get_inode_cache(vnode); 546 547 /* success */ 548 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 549 inode->i_flags |= S_NOATIME; 550 unlock_new_inode(inode); 551 _leave(" = %p", inode); 552 return inode; 553 554 /* failure */ 555 bad_inode: 556 iget_failed(inode); 557 _leave(" = %d [bad]", ret); 558 return ERR_PTR(ret); 559 } 560 561 /* 562 * mark the data attached to an inode as obsolete due to a write on the server 563 * - might also want to ditch all the outstanding writes and dirty pages 564 */ 565 void afs_zap_data(struct afs_vnode *vnode) 566 { 567 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 568 569 #ifdef CONFIG_AFS_FSCACHE 570 fscache_invalidate(vnode->cache); 571 #endif 572 573 /* nuke all the non-dirty pages that aren't locked, mapped or being 574 * written back in a regular file and completely discard the pages in a 575 * directory or symlink */ 576 if (S_ISREG(vnode->vfs_inode.i_mode)) 577 invalidate_remote_inode(&vnode->vfs_inode); 578 else 579 invalidate_inode_pages2(vnode->vfs_inode.i_mapping); 580 } 581 582 /* 583 * Check the validity of a vnode/inode. 584 */ 585 bool afs_check_validity(struct afs_vnode *vnode) 586 { 587 struct afs_cb_interest *cbi; 588 struct afs_server *server; 589 struct afs_volume *volume = vnode->volume; 590 time64_t now = ktime_get_real_seconds(); 591 bool valid, need_clear = false; 592 unsigned int cb_break, cb_s_break, cb_v_break; 593 int seq = 0; 594 595 do { 596 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 597 cb_v_break = READ_ONCE(volume->cb_v_break); 598 cb_break = vnode->cb_break; 599 600 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 601 cbi = rcu_dereference(vnode->cb_interest); 602 server = rcu_dereference(cbi->server); 603 cb_s_break = READ_ONCE(server->cb_s_break); 604 605 if (vnode->cb_s_break != cb_s_break || 606 vnode->cb_v_break != cb_v_break) { 607 vnode->cb_s_break = cb_s_break; 608 vnode->cb_v_break = cb_v_break; 609 need_clear = true; 610 valid = false; 611 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { 612 need_clear = true; 613 valid = false; 614 } else if (vnode->cb_expires_at - 10 <= now) { 615 need_clear = true; 616 valid = false; 617 } else { 618 valid = true; 619 } 620 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 621 valid = true; 622 } else { 623 vnode->cb_v_break = cb_v_break; 624 valid = false; 625 } 626 627 } while (need_seqretry(&vnode->cb_lock, seq)); 628 629 done_seqretry(&vnode->cb_lock, seq); 630 631 if (need_clear) { 632 write_seqlock(&vnode->cb_lock); 633 if (cb_break == vnode->cb_break) 634 __afs_break_callback(vnode); 635 write_sequnlock(&vnode->cb_lock); 636 valid = false; 637 } 638 639 return valid; 640 } 641 642 /* 643 * validate a vnode/inode 644 * - there are several things we need to check 645 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 646 * symlink) 647 * - parent dir metadata changed (security changes) 648 * - dentry data changed (write, truncate) 649 * - dentry metadata changed (security changes) 650 */ 651 int afs_validate(struct afs_vnode *vnode, struct key *key) 652 { 653 bool valid; 654 int ret; 655 656 _enter("{v={%llx:%llu} fl=%lx},%x", 657 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 658 key_serial(key)); 659 660 rcu_read_lock(); 661 valid = afs_check_validity(vnode); 662 rcu_read_unlock(); 663 664 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 665 clear_nlink(&vnode->vfs_inode); 666 667 if (valid) 668 goto valid; 669 670 down_write(&vnode->validate_lock); 671 672 /* if the promise has expired, we need to check the server again to get 673 * a new promise - note that if the (parent) directory's metadata was 674 * changed then the security may be different and we may no longer have 675 * access */ 676 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 677 _debug("not promised"); 678 ret = afs_fetch_status(vnode, key, false, NULL); 679 if (ret < 0) { 680 if (ret == -ENOENT) { 681 set_bit(AFS_VNODE_DELETED, &vnode->flags); 682 ret = -ESTALE; 683 } 684 goto error_unlock; 685 } 686 _debug("new promise [fl=%lx]", vnode->flags); 687 } 688 689 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 690 _debug("file already deleted"); 691 ret = -ESTALE; 692 goto error_unlock; 693 } 694 695 /* if the vnode's data version number changed then its contents are 696 * different */ 697 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 698 afs_zap_data(vnode); 699 up_write(&vnode->validate_lock); 700 valid: 701 _leave(" = 0"); 702 return 0; 703 704 error_unlock: 705 up_write(&vnode->validate_lock); 706 _leave(" = %d", ret); 707 return ret; 708 } 709 710 /* 711 * read the attributes of an inode 712 */ 713 int afs_getattr(const struct path *path, struct kstat *stat, 714 u32 request_mask, unsigned int query_flags) 715 { 716 struct inode *inode = d_inode(path->dentry); 717 struct afs_vnode *vnode = AFS_FS_I(inode); 718 int seq = 0; 719 720 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 721 722 do { 723 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 724 generic_fillattr(inode, stat); 725 } while (need_seqretry(&vnode->cb_lock, seq)); 726 727 done_seqretry(&vnode->cb_lock, seq); 728 return 0; 729 } 730 731 /* 732 * discard an AFS inode 733 */ 734 int afs_drop_inode(struct inode *inode) 735 { 736 _enter(""); 737 738 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 739 return generic_delete_inode(inode); 740 else 741 return generic_drop_inode(inode); 742 } 743 744 /* 745 * clear an AFS inode 746 */ 747 void afs_evict_inode(struct inode *inode) 748 { 749 struct afs_cb_interest *cbi; 750 struct afs_vnode *vnode; 751 752 vnode = AFS_FS_I(inode); 753 754 _enter("{%llx:%llu.%d}", 755 vnode->fid.vid, 756 vnode->fid.vnode, 757 vnode->fid.unique); 758 759 _debug("CLEAR INODE %p", inode); 760 761 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 762 763 truncate_inode_pages_final(&inode->i_data); 764 clear_inode(inode); 765 766 write_seqlock(&vnode->cb_lock); 767 cbi = rcu_dereference_protected(vnode->cb_interest, 768 lockdep_is_held(&vnode->cb_lock.lock)); 769 if (cbi) { 770 afs_put_cb_interest(afs_i2net(inode), cbi); 771 rcu_assign_pointer(vnode->cb_interest, NULL); 772 } 773 write_sequnlock(&vnode->cb_lock); 774 775 while (!list_empty(&vnode->wb_keys)) { 776 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 777 struct afs_wb_key, vnode_link); 778 list_del(&wbk->vnode_link); 779 afs_put_wb_key(wbk); 780 } 781 782 #ifdef CONFIG_AFS_FSCACHE 783 { 784 struct afs_vnode_cache_aux aux; 785 786 aux.data_version = vnode->status.data_version; 787 fscache_relinquish_cookie(vnode->cache, &aux, 788 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 789 vnode->cache = NULL; 790 } 791 #endif 792 793 afs_prune_wb_keys(vnode); 794 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 795 key_put(vnode->silly_key); 796 vnode->silly_key = NULL; 797 key_put(vnode->lock_key); 798 vnode->lock_key = NULL; 799 _leave(""); 800 } 801 802 /* 803 * set the attributes of an inode 804 */ 805 int afs_setattr(struct dentry *dentry, struct iattr *attr) 806 { 807 struct afs_fs_cursor fc; 808 struct afs_status_cb *scb; 809 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 810 struct key *key; 811 int ret = -ENOMEM; 812 813 _enter("{%llx:%llu},{n=%pd},%x", 814 vnode->fid.vid, vnode->fid.vnode, dentry, 815 attr->ia_valid); 816 817 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 818 ATTR_MTIME))) { 819 _leave(" = 0 [unsupported]"); 820 return 0; 821 } 822 823 scb = kzalloc(sizeof(struct afs_status_cb), GFP_KERNEL); 824 if (!scb) 825 goto error; 826 827 /* flush any dirty data outstanding on a regular file */ 828 if (S_ISREG(vnode->vfs_inode.i_mode)) 829 filemap_write_and_wait(vnode->vfs_inode.i_mapping); 830 831 if (attr->ia_valid & ATTR_FILE) { 832 key = afs_file_key(attr->ia_file); 833 } else { 834 key = afs_request_key(vnode->volume->cell); 835 if (IS_ERR(key)) { 836 ret = PTR_ERR(key); 837 goto error_scb; 838 } 839 } 840 841 ret = -ERESTARTSYS; 842 if (afs_begin_vnode_operation(&fc, vnode, key, false)) { 843 afs_dataversion_t data_version = vnode->status.data_version; 844 845 if (attr->ia_valid & ATTR_SIZE) 846 data_version++; 847 848 while (afs_select_fileserver(&fc)) { 849 fc.cb_break = afs_calc_vnode_cb_break(vnode); 850 afs_fs_setattr(&fc, attr, scb); 851 } 852 853 afs_check_for_remote_deletion(&fc, vnode); 854 afs_vnode_commit_status(&fc, vnode, fc.cb_break, 855 &data_version, scb); 856 ret = afs_end_vnode_operation(&fc); 857 } 858 859 if (!(attr->ia_valid & ATTR_FILE)) 860 key_put(key); 861 862 error_scb: 863 kfree(scb); 864 error: 865 _leave(" = %d", ret); 866 return ret; 867 } 868