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 28static const struct inode_operations afs_symlink_inode_operations = { 29 .get_link = page_get_link, 30}; 31 32static 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 */ 59static 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_fs_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_fs_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_fs_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 */ 152static 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\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 : "???"); 212 213 vnode->invalid_before = status->data_version; 214 if (vnode->status.type == AFS_FTYPE_DIR) { 215 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 216 afs_stat_v(vnode, n_inval); 217 } else { 218 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 219 } 220 change_size = true; 221 data_changed = 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 */ 251static 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 */ 268void 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 306out: 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 313static 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 329const 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 */ 339int 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 */ 368int 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 */ 381static 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 */ 392static 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 */ 412static void afs_get_inode_cache(struct afs_vnode *vnode) 413{ 414#ifdef CONFIG_AFS_FSCACHE 415 struct { 416 u32 vnode_id; 417 u32 unique; 418 u32 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_DIR) { 423 vnode->cache = NULL; 424 return; 425 } 426 427 key.vnode_id = vnode->fid.vnode; 428 key.unique = vnode->fid.unique; 429 key.vnode_id_ext[0] = vnode->fid.vnode >> 32; 430 key.vnode_id_ext[1] = vnode->fid.vnode_hi; 431 aux.data_version = vnode->status.data_version; 432 433 vnode->cache = fscache_acquire_cookie(vnode->volume->cache, 434 &afs_vnode_cache_index_def, 435 &key, sizeof(key), 436 &aux, sizeof(aux), 437 vnode, vnode->status.size, true); 438#endif 439} 440 441/* 442 * inode retrieval 443 */ 444struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 445{ 446 struct afs_vnode_param *dvp = &op->file[0]; 447 struct super_block *sb = dvp->vnode->vfs_inode.i_sb; 448 struct afs_vnode *vnode; 449 struct inode *inode; 450 int ret; 451 452 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 453 454 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 455 if (!inode) { 456 _leave(" = -ENOMEM"); 457 return ERR_PTR(-ENOMEM); 458 } 459 460 vnode = AFS_FS_I(inode); 461 462 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 463 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 464 465 /* deal with an existing inode */ 466 if (!(inode->i_state & I_NEW)) { 467 _leave(" = %p", inode); 468 return inode; 469 } 470 471 ret = afs_inode_init_from_status(op, vp, vnode); 472 if (ret < 0) 473 goto bad_inode; 474 475 afs_get_inode_cache(vnode); 476 477 /* success */ 478 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 479 unlock_new_inode(inode); 480 _leave(" = %p", inode); 481 return inode; 482 483 /* failure */ 484bad_inode: 485 iget_failed(inode); 486 _leave(" = %d [bad]", ret); 487 return ERR_PTR(ret); 488} 489 490static int afs_iget5_set_root(struct inode *inode, void *opaque) 491{ 492 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 493 struct afs_vnode *vnode = AFS_FS_I(inode); 494 495 vnode->volume = as->volume; 496 vnode->fid.vid = as->volume->vid, 497 vnode->fid.vnode = 1; 498 vnode->fid.unique = 1; 499 inode->i_ino = 1; 500 inode->i_generation = 1; 501 return 0; 502} 503 504/* 505 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 506 * the volume. 507 */ 508struct inode *afs_root_iget(struct super_block *sb, struct key *key) 509{ 510 struct afs_super_info *as = AFS_FS_S(sb); 511 struct afs_operation *op; 512 struct afs_vnode *vnode; 513 struct inode *inode; 514 int ret; 515 516 _enter(",{%llx},,", as->volume->vid); 517 518 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 519 if (!inode) { 520 _leave(" = -ENOMEM"); 521 return ERR_PTR(-ENOMEM); 522 } 523 524 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 525 526 BUG_ON(!(inode->i_state & I_NEW)); 527 528 vnode = AFS_FS_I(inode); 529 vnode->cb_v_break = as->volume->cb_v_break, 530 531 op = afs_alloc_operation(key, as->volume); 532 if (IS_ERR(op)) { 533 ret = PTR_ERR(op); 534 goto error; 535 } 536 537 afs_op_set_vnode(op, 0, vnode); 538 539 op->nr_files = 1; 540 op->ops = &afs_fetch_status_operation; 541 ret = afs_do_sync_operation(op); 542 if (ret < 0) 543 goto error; 544 545 afs_get_inode_cache(vnode); 546 547 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 548 unlock_new_inode(inode); 549 _leave(" = %p", inode); 550 return inode; 551 552error: 553 iget_failed(inode); 554 _leave(" = %d [bad]", ret); 555 return ERR_PTR(ret); 556} 557 558/* 559 * mark the data attached to an inode as obsolete due to a write on the server 560 * - might also want to ditch all the outstanding writes and dirty pages 561 */ 562static void afs_zap_data(struct afs_vnode *vnode) 563{ 564 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 565 566#ifdef CONFIG_AFS_FSCACHE 567 fscache_invalidate(vnode->cache); 568#endif 569 570 /* nuke all the non-dirty pages that aren't locked, mapped or being 571 * written back in a regular file and completely discard the pages in a 572 * directory or symlink */ 573 if (S_ISREG(vnode->vfs_inode.i_mode)) 574 invalidate_remote_inode(&vnode->vfs_inode); 575 else 576 invalidate_inode_pages2(vnode->vfs_inode.i_mapping); 577} 578 579/* 580 * Get the server reinit counter for a vnode's current server. 581 */ 582static bool afs_get_s_break_rcu(struct afs_vnode *vnode, unsigned int *_s_break) 583{ 584 struct afs_server_list *slist = rcu_dereference(vnode->volume->servers); 585 struct afs_server *server; 586 int i; 587 588 for (i = 0; i < slist->nr_servers; i++) { 589 server = slist->servers[i].server; 590 if (server == vnode->cb_server) { 591 *_s_break = READ_ONCE(server->cb_s_break); 592 return true; 593 } 594 } 595 596 return false; 597} 598 599/* 600 * Check the validity of a vnode/inode. 601 */ 602bool afs_check_validity(struct afs_vnode *vnode) 603{ 604 struct afs_volume *volume = vnode->volume; 605 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 606 time64_t now = ktime_get_real_seconds(); 607 bool valid; 608 unsigned int cb_break, cb_s_break, cb_v_break; 609 int seq = 0; 610 611 do { 612 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 613 cb_v_break = READ_ONCE(volume->cb_v_break); 614 cb_break = vnode->cb_break; 615 616 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 617 afs_get_s_break_rcu(vnode, &cb_s_break)) { 618 if (vnode->cb_s_break != cb_s_break || 619 vnode->cb_v_break != cb_v_break) { 620 vnode->cb_s_break = cb_s_break; 621 vnode->cb_v_break = cb_v_break; 622 need_clear = afs_cb_break_for_vsbreak; 623 valid = false; 624 } else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { 625 need_clear = afs_cb_break_for_zap; 626 valid = false; 627 } else if (vnode->cb_expires_at - 10 <= now) { 628 need_clear = afs_cb_break_for_lapsed; 629 valid = false; 630 } else { 631 valid = true; 632 } 633 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 634 valid = true; 635 } else { 636 vnode->cb_v_break = cb_v_break; 637 valid = false; 638 } 639 640 } while (need_seqretry(&vnode->cb_lock, seq)); 641 642 done_seqretry(&vnode->cb_lock, seq); 643 644 if (need_clear != afs_cb_break_no_break) { 645 write_seqlock(&vnode->cb_lock); 646 if (cb_break == vnode->cb_break) 647 __afs_break_callback(vnode, need_clear); 648 else 649 trace_afs_cb_miss(&vnode->fid, need_clear); 650 write_sequnlock(&vnode->cb_lock); 651 valid = false; 652 } 653 654 return valid; 655} 656 657/* 658 * validate a vnode/inode 659 * - there are several things we need to check 660 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 661 * symlink) 662 * - parent dir metadata changed (security changes) 663 * - dentry data changed (write, truncate) 664 * - dentry metadata changed (security changes) 665 */ 666int afs_validate(struct afs_vnode *vnode, struct key *key) 667{ 668 bool valid; 669 int ret; 670 671 _enter("{v={%llx:%llu} fl=%lx},%x", 672 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 673 key_serial(key)); 674 675 rcu_read_lock(); 676 valid = afs_check_validity(vnode); 677 rcu_read_unlock(); 678 679 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 680 clear_nlink(&vnode->vfs_inode); 681 682 if (valid) 683 goto valid; 684 685 down_write(&vnode->validate_lock); 686 687 /* if the promise has expired, we need to check the server again to get 688 * a new promise - note that if the (parent) directory's metadata was 689 * changed then the security may be different and we may no longer have 690 * access */ 691 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 692 _debug("not promised"); 693 ret = afs_fetch_status(vnode, key, false, NULL); 694 if (ret < 0) { 695 if (ret == -ENOENT) { 696 set_bit(AFS_VNODE_DELETED, &vnode->flags); 697 ret = -ESTALE; 698 } 699 goto error_unlock; 700 } 701 _debug("new promise [fl=%lx]", vnode->flags); 702 } 703 704 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 705 _debug("file already deleted"); 706 ret = -ESTALE; 707 goto error_unlock; 708 } 709 710 /* if the vnode's data version number changed then its contents are 711 * different */ 712 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 713 afs_zap_data(vnode); 714 up_write(&vnode->validate_lock); 715valid: 716 _leave(" = 0"); 717 return 0; 718 719error_unlock: 720 up_write(&vnode->validate_lock); 721 _leave(" = %d", ret); 722 return ret; 723} 724 725/* 726 * read the attributes of an inode 727 */ 728int afs_getattr(const struct path *path, struct kstat *stat, 729 u32 request_mask, unsigned int query_flags) 730{ 731 struct inode *inode = d_inode(path->dentry); 732 struct afs_vnode *vnode = AFS_FS_I(inode); 733 struct key *key; 734 int ret, seq = 0; 735 736 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 737 738 if (vnode->volume && 739 !(query_flags & AT_STATX_DONT_SYNC) && 740 !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 741 key = afs_request_key(vnode->volume->cell); 742 if (IS_ERR(key)) 743 return PTR_ERR(key); 744 ret = afs_validate(vnode, key); 745 key_put(key); 746 if (ret < 0) 747 return ret; 748 } 749 750 do { 751 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 752 generic_fillattr(inode, stat); 753 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 754 stat->nlink > 0) 755 stat->nlink -= 1; 756 } while (need_seqretry(&vnode->cb_lock, seq)); 757 758 done_seqretry(&vnode->cb_lock, seq); 759 return 0; 760} 761 762/* 763 * discard an AFS inode 764 */ 765int afs_drop_inode(struct inode *inode) 766{ 767 _enter(""); 768 769 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 770 return generic_delete_inode(inode); 771 else 772 return generic_drop_inode(inode); 773} 774 775/* 776 * clear an AFS inode 777 */ 778void afs_evict_inode(struct inode *inode) 779{ 780 struct afs_vnode *vnode; 781 782 vnode = AFS_FS_I(inode); 783 784 _enter("{%llx:%llu.%d}", 785 vnode->fid.vid, 786 vnode->fid.vnode, 787 vnode->fid.unique); 788 789 _debug("CLEAR INODE %p", inode); 790 791 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 792 793 truncate_inode_pages_final(&inode->i_data); 794 clear_inode(inode); 795 796 while (!list_empty(&vnode->wb_keys)) { 797 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 798 struct afs_wb_key, vnode_link); 799 list_del(&wbk->vnode_link); 800 afs_put_wb_key(wbk); 801 } 802 803#ifdef CONFIG_AFS_FSCACHE 804 { 805 struct afs_vnode_cache_aux aux; 806 807 aux.data_version = vnode->status.data_version; 808 fscache_relinquish_cookie(vnode->cache, &aux, 809 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 810 vnode->cache = NULL; 811 } 812#endif 813 814 afs_prune_wb_keys(vnode); 815 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 816 key_put(vnode->silly_key); 817 vnode->silly_key = NULL; 818 key_put(vnode->lock_key); 819 vnode->lock_key = NULL; 820 _leave(""); 821} 822 823static void afs_setattr_success(struct afs_operation *op) 824{ 825 struct afs_vnode_param *vp = &op->file[0]; 826 struct inode *inode = &vp->vnode->vfs_inode; 827 loff_t old_i_size = i_size_read(inode); 828 829 op->setattr.old_i_size = old_i_size; 830 afs_vnode_commit_status(op, vp); 831 /* inode->i_size has now been changed. */ 832 833 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 834 loff_t size = op->setattr.attr->ia_size; 835 if (size > old_i_size) 836 pagecache_isize_extended(inode, old_i_size, size); 837 } 838} 839 840static void afs_setattr_edit_file(struct afs_operation *op) 841{ 842 struct afs_vnode_param *vp = &op->file[0]; 843 struct inode *inode = &vp->vnode->vfs_inode; 844 845 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 846 loff_t size = op->setattr.attr->ia_size; 847 loff_t i_size = op->setattr.old_i_size; 848 849 if (size < i_size) 850 truncate_pagecache(inode, size); 851 } 852} 853 854static const struct afs_operation_ops afs_setattr_operation = { 855 .issue_afs_rpc = afs_fs_setattr, 856 .issue_yfs_rpc = yfs_fs_setattr, 857 .success = afs_setattr_success, 858 .edit_dir = afs_setattr_edit_file, 859}; 860 861/* 862 * set the attributes of an inode 863 */ 864int afs_setattr(struct dentry *dentry, struct iattr *attr) 865{ 866 struct afs_operation *op; 867 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 868 int ret; 869 870 _enter("{%llx:%llu},{n=%pd},%x", 871 vnode->fid.vid, vnode->fid.vnode, dentry, 872 attr->ia_valid); 873 874 if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 875 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | 876 ATTR_TOUCH))) { 877 _leave(" = 0 [unsupported]"); 878 return 0; 879 } 880 881 if (attr->ia_valid & ATTR_SIZE) { 882 if (!S_ISREG(vnode->vfs_inode.i_mode)) 883 return -EISDIR; 884 885 ret = inode_newsize_ok(&vnode->vfs_inode, attr->ia_size); 886 if (ret) 887 return ret; 888 889 if (attr->ia_size == i_size_read(&vnode->vfs_inode)) 890 attr->ia_valid &= ~ATTR_SIZE; 891 } 892 893 /* flush any dirty data outstanding on a regular file */ 894 if (S_ISREG(vnode->vfs_inode.i_mode)) 895 filemap_write_and_wait(vnode->vfs_inode.i_mapping); 896 897 /* Prevent any new writebacks from starting whilst we do this. */ 898 down_write(&vnode->validate_lock); 899 900 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 901 afs_file_key(attr->ia_file) : NULL), 902 vnode->volume); 903 if (IS_ERR(op)) { 904 ret = PTR_ERR(op); 905 goto out_unlock; 906 } 907 908 afs_op_set_vnode(op, 0, vnode); 909 op->setattr.attr = attr; 910 911 if (attr->ia_valid & ATTR_SIZE) { 912 op->file[0].dv_delta = 1; 913 op->file[0].set_size = true; 914 } 915 op->ctime = attr->ia_ctime; 916 op->file[0].update_ctime = 1; 917 op->file[0].modification = true; 918 919 op->ops = &afs_setattr_operation; 920 ret = afs_do_sync_operation(op); 921 922out_unlock: 923 up_write(&vnode->validate_lock); 924 _leave(" = %d", ret); 925 return ret; 926} 927