1 /* 2 * Copyright (c) 2002 Red Hat, Inc. All rights reserved. 3 * 4 * This software may be freely redistributed under the terms of the 5 * GNU General Public License. 6 * 7 * You should have received a copy of the GNU General Public License 8 * along with this program; if not, write to the Free Software 9 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 10 * 11 * Authors: David Woodhouse <dwmw2@infradead.org> 12 * David Howells <dhowells@redhat.com> 13 * 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/fs.h> 20 #include <linux/pagemap.h> 21 #include <linux/sched.h> 22 #include <linux/mount.h> 23 #include <linux/namei.h> 24 #include <linux/iversion.h> 25 #include "internal.h" 26 #include "afs_fs.h" 27 28 static const struct inode_operations afs_symlink_inode_operations = { 29 .get_link = page_get_link, 30 }; 31 32 static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode) 33 { 34 static unsigned long once_only; 35 36 pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type); 37 pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n", 38 vnode->status.abort_code, 39 vnode->status.mode, 40 vnode->status.size, 41 vnode->status.data_version); 42 pr_warn("kAFS: vnode %llx:%llx:%x\n", 43 vnode->fid.vid, 44 vnode->fid.vnode, 45 vnode->fid.unique); 46 if (parent_vnode) 47 pr_warn("kAFS: dir %llx:%llx:%x\n", 48 parent_vnode->fid.vid, 49 parent_vnode->fid.vnode, 50 parent_vnode->fid.unique); 51 52 if (!test_and_set_bit(0, &once_only)) 53 dump_stack(); 54 } 55 56 /* 57 * Set parameters for the netfs library 58 */ 59 static void afs_set_netfs_context(struct afs_vnode *vnode) 60 { 61 netfs_inode_init(&vnode->netfs, &afs_req_ops, true); 62 } 63 64 /* 65 * Initialise an inode from the vnode status. 66 */ 67 static int afs_inode_init_from_status(struct afs_operation *op, 68 struct afs_vnode_param *vp, 69 struct afs_vnode *vnode) 70 { 71 struct afs_file_status *status = &vp->scb.status; 72 struct inode *inode = AFS_VNODE_TO_I(vnode); 73 struct timespec64 t; 74 75 _enter("{%llx:%llu.%u} %s", 76 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 77 op->type ? op->type->name : "???"); 78 79 _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", 80 status->type, 81 status->nlink, 82 (unsigned long long) status->size, 83 status->data_version, 84 status->mode); 85 86 write_seqlock(&vnode->cb_lock); 87 88 vnode->cb_v_check = op->cb_v_break; 89 vnode->status = *status; 90 91 t = status->mtime_client; 92 inode_set_ctime_to_ts(inode, t); 93 inode_set_mtime_to_ts(inode, t); 94 inode_set_atime_to_ts(inode, t); 95 inode->i_flags |= S_NOATIME; 96 inode->i_uid = make_kuid(&init_user_ns, status->owner); 97 inode->i_gid = make_kgid(&init_user_ns, status->group); 98 set_nlink(&vnode->netfs.inode, status->nlink); 99 100 switch (status->type) { 101 case AFS_FTYPE_FILE: 102 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO); 103 inode->i_op = &afs_file_inode_operations; 104 inode->i_fop = &afs_file_operations; 105 inode->i_mapping->a_ops = &afs_file_aops; 106 mapping_set_large_folios(inode->i_mapping); 107 break; 108 case AFS_FTYPE_DIR: 109 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO); 110 inode->i_op = &afs_dir_inode_operations; 111 inode->i_fop = &afs_dir_file_operations; 112 inode->i_mapping->a_ops = &afs_dir_aops; 113 mapping_set_large_folios(inode->i_mapping); 114 break; 115 case AFS_FTYPE_SYMLINK: 116 /* Symlinks with a mode of 0644 are actually mountpoints. */ 117 if ((status->mode & 0777) == 0644) { 118 inode->i_flags |= S_AUTOMOUNT; 119 120 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 121 122 inode->i_mode = S_IFDIR | 0555; 123 inode->i_op = &afs_mntpt_inode_operations; 124 inode->i_fop = &afs_mntpt_file_operations; 125 inode->i_mapping->a_ops = &afs_symlink_aops; 126 } else { 127 inode->i_mode = S_IFLNK | status->mode; 128 inode->i_op = &afs_symlink_inode_operations; 129 inode->i_mapping->a_ops = &afs_symlink_aops; 130 } 131 inode_nohighmem(inode); 132 break; 133 default: 134 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL); 135 write_sequnlock(&vnode->cb_lock); 136 return afs_protocol_error(NULL, afs_eproto_file_type); 137 } 138 139 afs_set_i_size(vnode, status->size); 140 afs_set_netfs_context(vnode); 141 142 vnode->invalid_before = status->data_version; 143 inode_set_iversion_raw(&vnode->netfs.inode, status->data_version); 144 145 if (!vp->scb.have_cb) { 146 /* it's a symlink we just created (the fileserver 147 * didn't give us a callback) */ 148 atomic64_set(&vnode->cb_expires_at, AFS_NO_CB_PROMISE); 149 } else { 150 vnode->cb_server = op->server; 151 atomic64_set(&vnode->cb_expires_at, vp->scb.callback.expires_at); 152 } 153 154 write_sequnlock(&vnode->cb_lock); 155 return 0; 156 } 157 158 /* 159 * Update the core inode struct from a returned status record. 160 */ 161 static void afs_apply_status(struct afs_operation *op, 162 struct afs_vnode_param *vp) 163 { 164 struct afs_file_status *status = &vp->scb.status; 165 struct afs_vnode *vnode = vp->vnode; 166 struct inode *inode = &vnode->netfs.inode; 167 struct timespec64 t; 168 umode_t mode; 169 bool unexpected_jump = false; 170 bool data_changed = false; 171 bool change_size = vp->set_size; 172 173 _enter("{%llx:%llu.%u} %s", 174 vp->fid.vid, vp->fid.vnode, vp->fid.unique, 175 op->type ? op->type->name : "???"); 176 177 BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags)); 178 179 if (status->type != vnode->status.type) { 180 pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n", 181 vnode->fid.vid, 182 vnode->fid.vnode, 183 vnode->fid.unique, 184 status->type, vnode->status.type); 185 afs_protocol_error(NULL, afs_eproto_bad_status); 186 return; 187 } 188 189 if (status->nlink != vnode->status.nlink) 190 set_nlink(inode, status->nlink); 191 192 if (status->owner != vnode->status.owner) 193 inode->i_uid = make_kuid(&init_user_ns, status->owner); 194 195 if (status->group != vnode->status.group) 196 inode->i_gid = make_kgid(&init_user_ns, status->group); 197 198 if (status->mode != vnode->status.mode) { 199 mode = inode->i_mode; 200 mode &= ~S_IALLUGO; 201 mode |= status->mode & S_IALLUGO; 202 WRITE_ONCE(inode->i_mode, mode); 203 } 204 205 t = status->mtime_client; 206 inode_set_mtime_to_ts(inode, t); 207 if (vp->update_ctime) 208 inode_set_ctime_to_ts(inode, op->ctime); 209 210 if (vnode->status.data_version != status->data_version) 211 data_changed = true; 212 213 vnode->status = *status; 214 215 if (vp->dv_before + vp->dv_delta != status->data_version) { 216 if (vnode->cb_ro_snapshot == atomic_read(&vnode->volume->cb_ro_snapshot) && 217 atomic64_read(&vnode->cb_expires_at) != AFS_NO_CB_PROMISE) 218 pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\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 op->debug_id); 224 225 vnode->invalid_before = status->data_version; 226 if (vnode->status.type == AFS_FTYPE_DIR) { 227 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 228 afs_stat_v(vnode, n_inval); 229 } else { 230 set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags); 231 } 232 change_size = true; 233 data_changed = true; 234 unexpected_jump = true; 235 } else if (vnode->status.type == AFS_FTYPE_DIR) { 236 /* Expected directory change is handled elsewhere so 237 * that we can locally edit the directory and save on a 238 * download. 239 */ 240 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 241 data_changed = false; 242 change_size = true; 243 } 244 245 if (data_changed) { 246 inode_set_iversion_raw(inode, status->data_version); 247 248 /* Only update the size if the data version jumped. If the 249 * file is being modified locally, then we might have our own 250 * idea of what the size should be that's not the same as 251 * what's on the server. 252 */ 253 vnode->netfs.remote_i_size = status->size; 254 if (change_size || status->size > i_size_read(inode)) { 255 afs_set_i_size(vnode, status->size); 256 if (unexpected_jump) 257 vnode->netfs.zero_point = status->size; 258 inode_set_ctime_to_ts(inode, t); 259 inode_set_atime_to_ts(inode, t); 260 } 261 } 262 } 263 264 /* 265 * Apply a callback to a vnode. 266 */ 267 static void afs_apply_callback(struct afs_operation *op, 268 struct afs_vnode_param *vp) 269 { 270 struct afs_callback *cb = &vp->scb.callback; 271 struct afs_vnode *vnode = vp->vnode; 272 273 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) { 274 if (op->volume->type == AFSVL_RWVOL) 275 vnode->cb_server = op->server; 276 atomic64_set(&vnode->cb_expires_at, cb->expires_at); 277 } 278 } 279 280 /* 281 * Apply the received status and callback to an inode all in the same critical 282 * section to avoid races with afs_validate(). 283 */ 284 void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp) 285 { 286 struct afs_vnode *vnode = vp->vnode; 287 288 _enter(""); 289 290 write_seqlock(&vnode->cb_lock); 291 292 if (vp->scb.have_error) { 293 /* A YFS server will return this from RemoveFile2 and AFS and 294 * YFS will return this from InlineBulkStatus. 295 */ 296 if (vp->scb.status.abort_code == VNOVNODE) { 297 set_bit(AFS_VNODE_DELETED, &vnode->flags); 298 clear_nlink(&vnode->netfs.inode); 299 __afs_break_callback(vnode, afs_cb_break_for_deleted); 300 op->flags &= ~AFS_OPERATION_DIR_CONFLICT; 301 } 302 } else if (vp->scb.have_status) { 303 if (vp->speculative && 304 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) || 305 vp->dv_before != vnode->status.data_version)) 306 /* Ignore the result of a speculative bulk status fetch 307 * if it splits around a modification op, thereby 308 * appearing to regress the data version. 309 */ 310 goto out; 311 afs_apply_status(op, vp); 312 if (vp->scb.have_cb) 313 afs_apply_callback(op, vp); 314 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) { 315 drop_nlink(&vnode->netfs.inode); 316 if (vnode->netfs.inode.i_nlink == 0) { 317 set_bit(AFS_VNODE_DELETED, &vnode->flags); 318 __afs_break_callback(vnode, afs_cb_break_for_deleted); 319 } 320 } 321 322 out: 323 write_sequnlock(&vnode->cb_lock); 324 325 if (vp->scb.have_status) 326 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 327 } 328 329 static void afs_fetch_status_success(struct afs_operation *op) 330 { 331 struct afs_vnode_param *vp = &op->file[op->fetch_status.which]; 332 struct afs_vnode *vnode = vp->vnode; 333 int ret; 334 335 if (vnode->netfs.inode.i_state & I_NEW) { 336 ret = afs_inode_init_from_status(op, vp, vnode); 337 afs_op_set_error(op, ret); 338 if (ret == 0) 339 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 340 } else { 341 afs_vnode_commit_status(op, vp); 342 } 343 } 344 345 const struct afs_operation_ops afs_fetch_status_operation = { 346 .issue_afs_rpc = afs_fs_fetch_status, 347 .issue_yfs_rpc = yfs_fs_fetch_status, 348 .success = afs_fetch_status_success, 349 .aborted = afs_check_for_remote_deletion, 350 }; 351 352 /* 353 * Fetch file status from the volume. 354 */ 355 int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, 356 afs_access_t *_caller_access) 357 { 358 struct afs_operation *op; 359 360 _enter("%s,{%llx:%llu.%u,S=%lx}", 361 vnode->volume->name, 362 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, 363 vnode->flags); 364 365 op = afs_alloc_operation(key, vnode->volume); 366 if (IS_ERR(op)) 367 return PTR_ERR(op); 368 369 afs_op_set_vnode(op, 0, vnode); 370 371 op->nr_files = 1; 372 op->ops = &afs_fetch_status_operation; 373 afs_begin_vnode_operation(op); 374 afs_wait_for_operation(op); 375 376 if (_caller_access) 377 *_caller_access = op->file[0].scb.status.caller_access; 378 return afs_put_operation(op); 379 } 380 381 /* 382 * ilookup() comparator 383 */ 384 int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque) 385 { 386 struct afs_vnode *vnode = AFS_FS_I(inode); 387 struct afs_fid *fid = opaque; 388 389 return (fid->vnode == vnode->fid.vnode && 390 fid->vnode_hi == vnode->fid.vnode_hi && 391 fid->unique == vnode->fid.unique); 392 } 393 394 /* 395 * iget5() comparator 396 */ 397 static int afs_iget5_test(struct inode *inode, void *opaque) 398 { 399 struct afs_vnode_param *vp = opaque; 400 //struct afs_vnode *vnode = AFS_FS_I(inode); 401 402 return afs_ilookup5_test_by_fid(inode, &vp->fid); 403 } 404 405 /* 406 * iget5() inode initialiser 407 */ 408 static int afs_iget5_set(struct inode *inode, void *opaque) 409 { 410 struct afs_vnode_param *vp = opaque; 411 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 412 struct afs_vnode *vnode = AFS_FS_I(inode); 413 414 vnode->volume = as->volume; 415 vnode->fid = vp->fid; 416 417 /* YFS supports 96-bit vnode IDs, but Linux only supports 418 * 64-bit inode numbers. 419 */ 420 inode->i_ino = vnode->fid.vnode; 421 inode->i_generation = vnode->fid.unique; 422 return 0; 423 } 424 425 /* 426 * Get a cache cookie for an inode. 427 */ 428 static void afs_get_inode_cache(struct afs_vnode *vnode) 429 { 430 #ifdef CONFIG_AFS_FSCACHE 431 struct { 432 __be32 vnode_id; 433 __be32 unique; 434 __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */ 435 } __packed key; 436 struct afs_vnode_cache_aux aux; 437 438 if (vnode->status.type != AFS_FTYPE_FILE) { 439 vnode->netfs.cache = NULL; 440 return; 441 } 442 443 key.vnode_id = htonl(vnode->fid.vnode); 444 key.unique = htonl(vnode->fid.unique); 445 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32); 446 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi); 447 afs_set_cache_aux(vnode, &aux); 448 449 afs_vnode_set_cache(vnode, 450 fscache_acquire_cookie( 451 vnode->volume->cache, 452 vnode->status.type == AFS_FTYPE_FILE ? 453 0 : FSCACHE_ADV_SINGLE_CHUNK, 454 &key, sizeof(key), 455 &aux, sizeof(aux), 456 i_size_read(&vnode->netfs.inode))); 457 #endif 458 } 459 460 /* 461 * inode retrieval 462 */ 463 struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 464 { 465 struct afs_vnode_param *dvp = &op->file[0]; 466 struct super_block *sb = dvp->vnode->netfs.inode.i_sb; 467 struct afs_vnode *vnode; 468 struct inode *inode; 469 int ret; 470 471 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 472 473 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 474 if (!inode) { 475 _leave(" = -ENOMEM"); 476 return ERR_PTR(-ENOMEM); 477 } 478 479 vnode = AFS_FS_I(inode); 480 481 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 482 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 483 484 /* deal with an existing inode */ 485 if (!(inode->i_state & I_NEW)) { 486 _leave(" = %p", inode); 487 return inode; 488 } 489 490 ret = afs_inode_init_from_status(op, vp, vnode); 491 if (ret < 0) 492 goto bad_inode; 493 494 afs_get_inode_cache(vnode); 495 496 /* success */ 497 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 498 unlock_new_inode(inode); 499 _leave(" = %p", inode); 500 return inode; 501 502 /* failure */ 503 bad_inode: 504 iget_failed(inode); 505 _leave(" = %d [bad]", ret); 506 return ERR_PTR(ret); 507 } 508 509 static int afs_iget5_set_root(struct inode *inode, void *opaque) 510 { 511 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 512 struct afs_vnode *vnode = AFS_FS_I(inode); 513 514 vnode->volume = as->volume; 515 vnode->fid.vid = as->volume->vid; 516 vnode->fid.vnode = 1; 517 vnode->fid.unique = 1; 518 inode->i_ino = 1; 519 inode->i_generation = 1; 520 return 0; 521 } 522 523 /* 524 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 525 * the volume. 526 */ 527 struct inode *afs_root_iget(struct super_block *sb, struct key *key) 528 { 529 struct afs_super_info *as = AFS_FS_S(sb); 530 struct afs_operation *op; 531 struct afs_vnode *vnode; 532 struct inode *inode; 533 int ret; 534 535 _enter(",{%llx},,", as->volume->vid); 536 537 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 538 if (!inode) { 539 _leave(" = -ENOMEM"); 540 return ERR_PTR(-ENOMEM); 541 } 542 543 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 544 545 BUG_ON(!(inode->i_state & I_NEW)); 546 547 vnode = AFS_FS_I(inode); 548 vnode->cb_v_check = atomic_read(&as->volume->cb_v_break); 549 afs_set_netfs_context(vnode); 550 551 op = afs_alloc_operation(key, as->volume); 552 if (IS_ERR(op)) { 553 ret = PTR_ERR(op); 554 goto error; 555 } 556 557 afs_op_set_vnode(op, 0, vnode); 558 559 op->nr_files = 1; 560 op->ops = &afs_fetch_status_operation; 561 ret = afs_do_sync_operation(op); 562 if (ret < 0) 563 goto error; 564 565 afs_get_inode_cache(vnode); 566 567 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 568 unlock_new_inode(inode); 569 _leave(" = %p", inode); 570 return inode; 571 572 error: 573 iget_failed(inode); 574 _leave(" = %d [bad]", ret); 575 return ERR_PTR(ret); 576 } 577 578 /* 579 * read the attributes of an inode 580 */ 581 int afs_getattr(struct mnt_idmap *idmap, const struct path *path, 582 struct kstat *stat, u32 request_mask, unsigned int query_flags) 583 { 584 struct inode *inode = d_inode(path->dentry); 585 struct afs_vnode *vnode = AFS_FS_I(inode); 586 struct key *key; 587 int ret, seq; 588 589 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 590 591 if (vnode->volume && 592 !(query_flags & AT_STATX_DONT_SYNC) && 593 atomic64_read(&vnode->cb_expires_at) == AFS_NO_CB_PROMISE) { 594 key = afs_request_key(vnode->volume->cell); 595 if (IS_ERR(key)) 596 return PTR_ERR(key); 597 ret = afs_validate(vnode, key); 598 key_put(key); 599 if (ret < 0) 600 return ret; 601 } 602 603 do { 604 seq = read_seqbegin(&vnode->cb_lock); 605 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 606 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 607 stat->nlink > 0) 608 stat->nlink -= 1; 609 610 /* Lie about the size of directories. We maintain a locally 611 * edited copy and may make different allocation decisions on 612 * it, but we need to give userspace the server's size. 613 */ 614 if (S_ISDIR(inode->i_mode)) 615 stat->size = vnode->netfs.remote_i_size; 616 } while (read_seqretry(&vnode->cb_lock, seq)); 617 618 return 0; 619 } 620 621 /* 622 * discard an AFS inode 623 */ 624 int afs_drop_inode(struct inode *inode) 625 { 626 _enter(""); 627 628 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 629 return generic_delete_inode(inode); 630 else 631 return generic_drop_inode(inode); 632 } 633 634 /* 635 * clear an AFS inode 636 */ 637 void afs_evict_inode(struct inode *inode) 638 { 639 struct afs_vnode_cache_aux aux; 640 struct afs_vnode *vnode = AFS_FS_I(inode); 641 642 _enter("{%llx:%llu.%d}", 643 vnode->fid.vid, 644 vnode->fid.vnode, 645 vnode->fid.unique); 646 647 _debug("CLEAR INODE %p", inode); 648 649 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 650 651 netfs_wait_for_outstanding_io(inode); 652 truncate_inode_pages_final(&inode->i_data); 653 654 afs_set_cache_aux(vnode, &aux); 655 netfs_clear_inode_writeback(inode, &aux); 656 clear_inode(inode); 657 658 while (!list_empty(&vnode->wb_keys)) { 659 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 660 struct afs_wb_key, vnode_link); 661 list_del(&wbk->vnode_link); 662 afs_put_wb_key(wbk); 663 } 664 665 fscache_relinquish_cookie(afs_vnode_cache(vnode), 666 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 667 668 afs_prune_wb_keys(vnode); 669 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 670 key_put(vnode->silly_key); 671 vnode->silly_key = NULL; 672 key_put(vnode->lock_key); 673 vnode->lock_key = NULL; 674 _leave(""); 675 } 676 677 static void afs_setattr_success(struct afs_operation *op) 678 { 679 struct afs_vnode_param *vp = &op->file[0]; 680 struct inode *inode = &vp->vnode->netfs.inode; 681 loff_t old_i_size = i_size_read(inode); 682 683 op->setattr.old_i_size = old_i_size; 684 afs_vnode_commit_status(op, vp); 685 /* inode->i_size has now been changed. */ 686 687 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 688 loff_t size = op->setattr.attr->ia_size; 689 if (size > old_i_size) 690 pagecache_isize_extended(inode, old_i_size, size); 691 } 692 } 693 694 static void afs_setattr_edit_file(struct afs_operation *op) 695 { 696 struct afs_vnode_param *vp = &op->file[0]; 697 struct afs_vnode *vnode = vp->vnode; 698 struct inode *inode = &vnode->netfs.inode; 699 700 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 701 loff_t size = op->setattr.attr->ia_size; 702 loff_t old = op->setattr.old_i_size; 703 704 /* Note: inode->i_size was updated by afs_apply_status() inside 705 * the I/O and callback locks. 706 */ 707 708 if (size != old) { 709 truncate_pagecache(inode, size); 710 netfs_resize_file(&vnode->netfs, size, true); 711 fscache_resize_cookie(afs_vnode_cache(vnode), size); 712 } 713 } 714 } 715 716 static const struct afs_operation_ops afs_setattr_operation = { 717 .issue_afs_rpc = afs_fs_setattr, 718 .issue_yfs_rpc = yfs_fs_setattr, 719 .success = afs_setattr_success, 720 .edit_dir = afs_setattr_edit_file, 721 }; 722 723 /* 724 * set the attributes of an inode 725 */ 726 int afs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 727 struct iattr *attr) 728 { 729 const unsigned int supported = 730 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 731 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH; 732 struct afs_operation *op; 733 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 734 struct inode *inode = &vnode->netfs.inode; 735 loff_t i_size; 736 int ret; 737 738 _enter("{%llx:%llu},{n=%pd},%x", 739 vnode->fid.vid, vnode->fid.vnode, dentry, 740 attr->ia_valid); 741 742 if (!(attr->ia_valid & supported)) { 743 _leave(" = 0 [unsupported]"); 744 return 0; 745 } 746 747 i_size = i_size_read(inode); 748 if (attr->ia_valid & ATTR_SIZE) { 749 if (!S_ISREG(inode->i_mode)) 750 return -EISDIR; 751 752 ret = inode_newsize_ok(inode, attr->ia_size); 753 if (ret) 754 return ret; 755 756 if (attr->ia_size == i_size) 757 attr->ia_valid &= ~ATTR_SIZE; 758 } 759 760 fscache_use_cookie(afs_vnode_cache(vnode), true); 761 762 /* Prevent any new writebacks from starting whilst we do this. */ 763 down_write(&vnode->validate_lock); 764 765 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) { 766 loff_t size = attr->ia_size; 767 768 /* Wait for any outstanding writes to the server to complete */ 769 loff_t from = min(size, i_size); 770 loff_t to = max(size, i_size); 771 ret = filemap_fdatawait_range(inode->i_mapping, from, to); 772 if (ret < 0) 773 goto out_unlock; 774 775 /* Don't talk to the server if we're just shortening in-memory 776 * writes that haven't gone to the server yet. 777 */ 778 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) && 779 attr->ia_size < i_size && 780 attr->ia_size > vnode->netfs.remote_i_size) { 781 truncate_setsize(inode, attr->ia_size); 782 netfs_resize_file(&vnode->netfs, size, false); 783 fscache_resize_cookie(afs_vnode_cache(vnode), 784 attr->ia_size); 785 ret = 0; 786 goto out_unlock; 787 } 788 } 789 790 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 791 afs_file_key(attr->ia_file) : NULL), 792 vnode->volume); 793 if (IS_ERR(op)) { 794 ret = PTR_ERR(op); 795 goto out_unlock; 796 } 797 798 afs_op_set_vnode(op, 0, vnode); 799 op->setattr.attr = attr; 800 801 if (attr->ia_valid & ATTR_SIZE) { 802 op->file[0].dv_delta = 1; 803 op->file[0].set_size = true; 804 } 805 op->ctime = attr->ia_ctime; 806 op->file[0].update_ctime = 1; 807 op->file[0].modification = true; 808 809 op->ops = &afs_setattr_operation; 810 ret = afs_do_sync_operation(op); 811 812 out_unlock: 813 up_write(&vnode->validate_lock); 814 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL); 815 _leave(" = %d", ret); 816 return ret; 817 } 818