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 * Set parameters for the netfs library 58 */ 59static void afs_set_netfs_context(struct afs_vnode *vnode) 60{ 61 netfs_inode_init(&vnode->netfs, &afs_req_ops); 62} 63 64/* 65 * Initialise an inode from the vnode status. 66 */ 67static 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_break = op->cb_v_break; 89 vnode->cb_s_break = op->cb_s_break; 90 vnode->status = *status; 91 92 t = status->mtime_client; 93 inode_set_ctime_to_ts(inode, t); 94 inode->i_mtime = t; 95 inode->i_atime = t; 96 inode->i_flags |= S_NOATIME; 97 inode->i_uid = make_kuid(&init_user_ns, status->owner); 98 inode->i_gid = make_kgid(&init_user_ns, status->group); 99 set_nlink(&vnode->netfs.inode, status->nlink); 100 101 switch (status->type) { 102 case AFS_FTYPE_FILE: 103 inode->i_mode = S_IFREG | (status->mode & S_IALLUGO); 104 inode->i_op = &afs_file_inode_operations; 105 inode->i_fop = &afs_file_operations; 106 inode->i_mapping->a_ops = &afs_file_aops; 107 mapping_set_large_folios(inode->i_mapping); 108 break; 109 case AFS_FTYPE_DIR: 110 inode->i_mode = S_IFDIR | (status->mode & S_IALLUGO); 111 inode->i_op = &afs_dir_inode_operations; 112 inode->i_fop = &afs_dir_file_operations; 113 inode->i_mapping->a_ops = &afs_dir_aops; 114 mapping_set_large_folios(inode->i_mapping); 115 break; 116 case AFS_FTYPE_SYMLINK: 117 /* Symlinks with a mode of 0644 are actually mountpoints. */ 118 if ((status->mode & 0777) == 0644) { 119 inode->i_flags |= S_AUTOMOUNT; 120 121 set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); 122 123 inode->i_mode = S_IFDIR | 0555; 124 inode->i_op = &afs_mntpt_inode_operations; 125 inode->i_fop = &afs_mntpt_file_operations; 126 inode->i_mapping->a_ops = &afs_symlink_aops; 127 } else { 128 inode->i_mode = S_IFLNK | status->mode; 129 inode->i_op = &afs_symlink_inode_operations; 130 inode->i_mapping->a_ops = &afs_symlink_aops; 131 } 132 inode_nohighmem(inode); 133 break; 134 default: 135 dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL); 136 write_sequnlock(&vnode->cb_lock); 137 return afs_protocol_error(NULL, afs_eproto_file_type); 138 } 139 140 afs_set_i_size(vnode, status->size); 141 afs_set_netfs_context(vnode); 142 143 vnode->invalid_before = status->data_version; 144 inode_set_iversion_raw(&vnode->netfs.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 */ 163static 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->netfs.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 & S_IALLUGO; 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_set_ctime_to_ts(inode, 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 (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 } else if (vnode->status.type == AFS_FTYPE_DIR) { 235 /* Expected directory change is handled elsewhere so 236 * that we can locally edit the directory and save on a 237 * download. 238 */ 239 if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags)) 240 data_changed = false; 241 change_size = true; 242 } 243 244 if (data_changed) { 245 inode_set_iversion_raw(inode, status->data_version); 246 247 /* Only update the size if the data version jumped. If the 248 * file is being modified locally, then we might have our own 249 * idea of what the size should be that's not the same as 250 * what's on the server. 251 */ 252 vnode->netfs.remote_i_size = status->size; 253 if (change_size) { 254 afs_set_i_size(vnode, status->size); 255 inode_set_ctime_to_ts(inode, t); 256 inode->i_atime = t; 257 } 258 } 259} 260 261/* 262 * Apply a callback to a vnode. 263 */ 264static void afs_apply_callback(struct afs_operation *op, 265 struct afs_vnode_param *vp) 266{ 267 struct afs_callback *cb = &vp->scb.callback; 268 struct afs_vnode *vnode = vp->vnode; 269 270 if (!afs_cb_is_broken(vp->cb_break_before, vnode)) { 271 vnode->cb_expires_at = cb->expires_at; 272 vnode->cb_server = op->server; 273 set_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 274 } 275} 276 277/* 278 * Apply the received status and callback to an inode all in the same critical 279 * section to avoid races with afs_validate(). 280 */ 281void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp) 282{ 283 struct afs_vnode *vnode = vp->vnode; 284 285 _enter(""); 286 287 write_seqlock(&vnode->cb_lock); 288 289 if (vp->scb.have_error) { 290 /* A YFS server will return this from RemoveFile2 and AFS and 291 * YFS will return this from InlineBulkStatus. 292 */ 293 if (vp->scb.status.abort_code == VNOVNODE) { 294 set_bit(AFS_VNODE_DELETED, &vnode->flags); 295 clear_nlink(&vnode->netfs.inode); 296 __afs_break_callback(vnode, afs_cb_break_for_deleted); 297 op->flags &= ~AFS_OPERATION_DIR_CONFLICT; 298 } 299 } else if (vp->scb.have_status) { 300 if (vp->speculative && 301 (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) || 302 vp->dv_before != vnode->status.data_version)) 303 /* Ignore the result of a speculative bulk status fetch 304 * if it splits around a modification op, thereby 305 * appearing to regress the data version. 306 */ 307 goto out; 308 afs_apply_status(op, vp); 309 if (vp->scb.have_cb) 310 afs_apply_callback(op, vp); 311 } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) { 312 drop_nlink(&vnode->netfs.inode); 313 if (vnode->netfs.inode.i_nlink == 0) { 314 set_bit(AFS_VNODE_DELETED, &vnode->flags); 315 __afs_break_callback(vnode, afs_cb_break_for_deleted); 316 } 317 } 318 319out: 320 write_sequnlock(&vnode->cb_lock); 321 322 if (vp->scb.have_status) 323 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 324} 325 326static void afs_fetch_status_success(struct afs_operation *op) 327{ 328 struct afs_vnode_param *vp = &op->file[op->fetch_status.which]; 329 struct afs_vnode *vnode = vp->vnode; 330 int ret; 331 332 if (vnode->netfs.inode.i_state & I_NEW) { 333 ret = afs_inode_init_from_status(op, vp, vnode); 334 op->error = ret; 335 if (ret == 0) 336 afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb); 337 } else { 338 afs_vnode_commit_status(op, vp); 339 } 340} 341 342const struct afs_operation_ops afs_fetch_status_operation = { 343 .issue_afs_rpc = afs_fs_fetch_status, 344 .issue_yfs_rpc = yfs_fs_fetch_status, 345 .success = afs_fetch_status_success, 346 .aborted = afs_check_for_remote_deletion, 347}; 348 349/* 350 * Fetch file status from the volume. 351 */ 352int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new, 353 afs_access_t *_caller_access) 354{ 355 struct afs_operation *op; 356 357 _enter("%s,{%llx:%llu.%u,S=%lx}", 358 vnode->volume->name, 359 vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique, 360 vnode->flags); 361 362 op = afs_alloc_operation(key, vnode->volume); 363 if (IS_ERR(op)) 364 return PTR_ERR(op); 365 366 afs_op_set_vnode(op, 0, vnode); 367 368 op->nr_files = 1; 369 op->ops = &afs_fetch_status_operation; 370 afs_begin_vnode_operation(op); 371 afs_wait_for_operation(op); 372 373 if (_caller_access) 374 *_caller_access = op->file[0].scb.status.caller_access; 375 return afs_put_operation(op); 376} 377 378/* 379 * ilookup() comparator 380 */ 381int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque) 382{ 383 struct afs_vnode *vnode = AFS_FS_I(inode); 384 struct afs_fid *fid = opaque; 385 386 return (fid->vnode == vnode->fid.vnode && 387 fid->vnode_hi == vnode->fid.vnode_hi && 388 fid->unique == vnode->fid.unique); 389} 390 391/* 392 * iget5() comparator 393 */ 394static int afs_iget5_test(struct inode *inode, void *opaque) 395{ 396 struct afs_vnode_param *vp = opaque; 397 //struct afs_vnode *vnode = AFS_FS_I(inode); 398 399 return afs_ilookup5_test_by_fid(inode, &vp->fid); 400} 401 402/* 403 * iget5() inode initialiser 404 */ 405static int afs_iget5_set(struct inode *inode, void *opaque) 406{ 407 struct afs_vnode_param *vp = opaque; 408 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 409 struct afs_vnode *vnode = AFS_FS_I(inode); 410 411 vnode->volume = as->volume; 412 vnode->fid = vp->fid; 413 414 /* YFS supports 96-bit vnode IDs, but Linux only supports 415 * 64-bit inode numbers. 416 */ 417 inode->i_ino = vnode->fid.vnode; 418 inode->i_generation = vnode->fid.unique; 419 return 0; 420} 421 422/* 423 * Get a cache cookie for an inode. 424 */ 425static void afs_get_inode_cache(struct afs_vnode *vnode) 426{ 427#ifdef CONFIG_AFS_FSCACHE 428 struct { 429 __be32 vnode_id; 430 __be32 unique; 431 __be32 vnode_id_ext[2]; /* Allow for a 96-bit key */ 432 } __packed key; 433 struct afs_vnode_cache_aux aux; 434 435 if (vnode->status.type != AFS_FTYPE_FILE) { 436 vnode->netfs.cache = NULL; 437 return; 438 } 439 440 key.vnode_id = htonl(vnode->fid.vnode); 441 key.unique = htonl(vnode->fid.unique); 442 key.vnode_id_ext[0] = htonl(vnode->fid.vnode >> 32); 443 key.vnode_id_ext[1] = htonl(vnode->fid.vnode_hi); 444 afs_set_cache_aux(vnode, &aux); 445 446 afs_vnode_set_cache(vnode, 447 fscache_acquire_cookie( 448 vnode->volume->cache, 449 vnode->status.type == AFS_FTYPE_FILE ? 450 0 : FSCACHE_ADV_SINGLE_CHUNK, 451 &key, sizeof(key), 452 &aux, sizeof(aux), 453 i_size_read(&vnode->netfs.inode))); 454#endif 455} 456 457/* 458 * inode retrieval 459 */ 460struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp) 461{ 462 struct afs_vnode_param *dvp = &op->file[0]; 463 struct super_block *sb = dvp->vnode->netfs.inode.i_sb; 464 struct afs_vnode *vnode; 465 struct inode *inode; 466 int ret; 467 468 _enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique); 469 470 inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp); 471 if (!inode) { 472 _leave(" = -ENOMEM"); 473 return ERR_PTR(-ENOMEM); 474 } 475 476 vnode = AFS_FS_I(inode); 477 478 _debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }", 479 inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); 480 481 /* deal with an existing inode */ 482 if (!(inode->i_state & I_NEW)) { 483 _leave(" = %p", inode); 484 return inode; 485 } 486 487 ret = afs_inode_init_from_status(op, vp, vnode); 488 if (ret < 0) 489 goto bad_inode; 490 491 afs_get_inode_cache(vnode); 492 493 /* success */ 494 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 495 unlock_new_inode(inode); 496 _leave(" = %p", inode); 497 return inode; 498 499 /* failure */ 500bad_inode: 501 iget_failed(inode); 502 _leave(" = %d [bad]", ret); 503 return ERR_PTR(ret); 504} 505 506static int afs_iget5_set_root(struct inode *inode, void *opaque) 507{ 508 struct afs_super_info *as = AFS_FS_S(inode->i_sb); 509 struct afs_vnode *vnode = AFS_FS_I(inode); 510 511 vnode->volume = as->volume; 512 vnode->fid.vid = as->volume->vid, 513 vnode->fid.vnode = 1; 514 vnode->fid.unique = 1; 515 inode->i_ino = 1; 516 inode->i_generation = 1; 517 return 0; 518} 519 520/* 521 * Set up the root inode for a volume. This is always vnode 1, unique 1 within 522 * the volume. 523 */ 524struct inode *afs_root_iget(struct super_block *sb, struct key *key) 525{ 526 struct afs_super_info *as = AFS_FS_S(sb); 527 struct afs_operation *op; 528 struct afs_vnode *vnode; 529 struct inode *inode; 530 int ret; 531 532 _enter(",{%llx},,", as->volume->vid); 533 534 inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL); 535 if (!inode) { 536 _leave(" = -ENOMEM"); 537 return ERR_PTR(-ENOMEM); 538 } 539 540 _debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid); 541 542 BUG_ON(!(inode->i_state & I_NEW)); 543 544 vnode = AFS_FS_I(inode); 545 vnode->cb_v_break = as->volume->cb_v_break, 546 afs_set_netfs_context(vnode); 547 548 op = afs_alloc_operation(key, as->volume); 549 if (IS_ERR(op)) { 550 ret = PTR_ERR(op); 551 goto error; 552 } 553 554 afs_op_set_vnode(op, 0, vnode); 555 556 op->nr_files = 1; 557 op->ops = &afs_fetch_status_operation; 558 ret = afs_do_sync_operation(op); 559 if (ret < 0) 560 goto error; 561 562 afs_get_inode_cache(vnode); 563 564 clear_bit(AFS_VNODE_UNSET, &vnode->flags); 565 unlock_new_inode(inode); 566 _leave(" = %p", inode); 567 return inode; 568 569error: 570 iget_failed(inode); 571 _leave(" = %d [bad]", ret); 572 return ERR_PTR(ret); 573} 574 575/* 576 * mark the data attached to an inode as obsolete due to a write on the server 577 * - might also want to ditch all the outstanding writes and dirty pages 578 */ 579static void afs_zap_data(struct afs_vnode *vnode) 580{ 581 _enter("{%llx:%llu}", vnode->fid.vid, vnode->fid.vnode); 582 583 afs_invalidate_cache(vnode, 0); 584 585 /* nuke all the non-dirty pages that aren't locked, mapped or being 586 * written back in a regular file and completely discard the pages in a 587 * directory or symlink */ 588 if (S_ISREG(vnode->netfs.inode.i_mode)) 589 invalidate_remote_inode(&vnode->netfs.inode); 590 else 591 invalidate_inode_pages2(vnode->netfs.inode.i_mapping); 592} 593 594/* 595 * Check to see if we have a server currently serving this volume and that it 596 * hasn't been reinitialised or dropped from the list. 597 */ 598static bool afs_check_server_good(struct afs_vnode *vnode) 599{ 600 struct afs_server_list *slist; 601 struct afs_server *server; 602 bool good; 603 int i; 604 605 if (vnode->cb_fs_s_break == atomic_read(&vnode->volume->cell->fs_s_break)) 606 return true; 607 608 rcu_read_lock(); 609 610 slist = rcu_dereference(vnode->volume->servers); 611 for (i = 0; i < slist->nr_servers; i++) { 612 server = slist->servers[i].server; 613 if (server == vnode->cb_server) { 614 good = (vnode->cb_s_break == server->cb_s_break); 615 rcu_read_unlock(); 616 return good; 617 } 618 } 619 620 rcu_read_unlock(); 621 return false; 622} 623 624/* 625 * Check the validity of a vnode/inode. 626 */ 627bool afs_check_validity(struct afs_vnode *vnode) 628{ 629 enum afs_cb_break_reason need_clear = afs_cb_break_no_break; 630 time64_t now = ktime_get_real_seconds(); 631 unsigned int cb_break; 632 int seq = 0; 633 634 do { 635 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 636 cb_break = vnode->cb_break; 637 638 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 639 if (vnode->cb_v_break != vnode->volume->cb_v_break) 640 need_clear = afs_cb_break_for_v_break; 641 else if (!afs_check_server_good(vnode)) 642 need_clear = afs_cb_break_for_s_reinit; 643 else if (test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 644 need_clear = afs_cb_break_for_zap; 645 else if (vnode->cb_expires_at - 10 <= now) 646 need_clear = afs_cb_break_for_lapsed; 647 } else if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 648 ; 649 } else { 650 need_clear = afs_cb_break_no_promise; 651 } 652 653 } while (need_seqretry(&vnode->cb_lock, seq)); 654 655 done_seqretry(&vnode->cb_lock, seq); 656 657 if (need_clear == afs_cb_break_no_break) 658 return true; 659 660 write_seqlock(&vnode->cb_lock); 661 if (need_clear == afs_cb_break_no_promise) 662 vnode->cb_v_break = vnode->volume->cb_v_break; 663 else if (cb_break == vnode->cb_break) 664 __afs_break_callback(vnode, need_clear); 665 else 666 trace_afs_cb_miss(&vnode->fid, need_clear); 667 write_sequnlock(&vnode->cb_lock); 668 return false; 669} 670 671/* 672 * Returns true if the pagecache is still valid. Does not sleep. 673 */ 674bool afs_pagecache_valid(struct afs_vnode *vnode) 675{ 676 if (unlikely(test_bit(AFS_VNODE_DELETED, &vnode->flags))) { 677 if (vnode->netfs.inode.i_nlink) 678 clear_nlink(&vnode->netfs.inode); 679 return true; 680 } 681 682 if (test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags) && 683 afs_check_validity(vnode)) 684 return true; 685 686 return false; 687} 688 689/* 690 * validate a vnode/inode 691 * - there are several things we need to check 692 * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, 693 * symlink) 694 * - parent dir metadata changed (security changes) 695 * - dentry data changed (write, truncate) 696 * - dentry metadata changed (security changes) 697 */ 698int afs_validate(struct afs_vnode *vnode, struct key *key) 699{ 700 int ret; 701 702 _enter("{v={%llx:%llu} fl=%lx},%x", 703 vnode->fid.vid, vnode->fid.vnode, vnode->flags, 704 key_serial(key)); 705 706 if (afs_pagecache_valid(vnode)) 707 goto valid; 708 709 down_write(&vnode->validate_lock); 710 711 /* if the promise has expired, we need to check the server again to get 712 * a new promise - note that if the (parent) directory's metadata was 713 * changed then the security may be different and we may no longer have 714 * access */ 715 if (!test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 716 _debug("not promised"); 717 ret = afs_fetch_status(vnode, key, false, NULL); 718 if (ret < 0) { 719 if (ret == -ENOENT) { 720 set_bit(AFS_VNODE_DELETED, &vnode->flags); 721 ret = -ESTALE; 722 } 723 goto error_unlock; 724 } 725 _debug("new promise [fl=%lx]", vnode->flags); 726 } 727 728 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 729 _debug("file already deleted"); 730 ret = -ESTALE; 731 goto error_unlock; 732 } 733 734 /* if the vnode's data version number changed then its contents are 735 * different */ 736 if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) 737 afs_zap_data(vnode); 738 up_write(&vnode->validate_lock); 739valid: 740 _leave(" = 0"); 741 return 0; 742 743error_unlock: 744 up_write(&vnode->validate_lock); 745 _leave(" = %d", ret); 746 return ret; 747} 748 749/* 750 * read the attributes of an inode 751 */ 752int afs_getattr(struct mnt_idmap *idmap, const struct path *path, 753 struct kstat *stat, u32 request_mask, unsigned int query_flags) 754{ 755 struct inode *inode = d_inode(path->dentry); 756 struct afs_vnode *vnode = AFS_FS_I(inode); 757 struct key *key; 758 int ret, seq = 0; 759 760 _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); 761 762 if (vnode->volume && 763 !(query_flags & AT_STATX_DONT_SYNC) && 764 !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) { 765 key = afs_request_key(vnode->volume->cell); 766 if (IS_ERR(key)) 767 return PTR_ERR(key); 768 ret = afs_validate(vnode, key); 769 key_put(key); 770 if (ret < 0) 771 return ret; 772 } 773 774 do { 775 read_seqbegin_or_lock(&vnode->cb_lock, &seq); 776 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 777 if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) && 778 stat->nlink > 0) 779 stat->nlink -= 1; 780 781 /* Lie about the size of directories. We maintain a locally 782 * edited copy and may make different allocation decisions on 783 * it, but we need to give userspace the server's size. 784 */ 785 if (S_ISDIR(inode->i_mode)) 786 stat->size = vnode->netfs.remote_i_size; 787 } while (need_seqretry(&vnode->cb_lock, seq)); 788 789 done_seqretry(&vnode->cb_lock, seq); 790 return 0; 791} 792 793/* 794 * discard an AFS inode 795 */ 796int afs_drop_inode(struct inode *inode) 797{ 798 _enter(""); 799 800 if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) 801 return generic_delete_inode(inode); 802 else 803 return generic_drop_inode(inode); 804} 805 806/* 807 * clear an AFS inode 808 */ 809void afs_evict_inode(struct inode *inode) 810{ 811 struct afs_vnode_cache_aux aux; 812 struct afs_vnode *vnode = AFS_FS_I(inode); 813 814 _enter("{%llx:%llu.%d}", 815 vnode->fid.vid, 816 vnode->fid.vnode, 817 vnode->fid.unique); 818 819 _debug("CLEAR INODE %p", inode); 820 821 ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); 822 823 truncate_inode_pages_final(&inode->i_data); 824 825 afs_set_cache_aux(vnode, &aux); 826 fscache_clear_inode_writeback(afs_vnode_cache(vnode), inode, &aux); 827 clear_inode(inode); 828 829 while (!list_empty(&vnode->wb_keys)) { 830 struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next, 831 struct afs_wb_key, vnode_link); 832 list_del(&wbk->vnode_link); 833 afs_put_wb_key(wbk); 834 } 835 836 fscache_relinquish_cookie(afs_vnode_cache(vnode), 837 test_bit(AFS_VNODE_DELETED, &vnode->flags)); 838 839 afs_prune_wb_keys(vnode); 840 afs_put_permits(rcu_access_pointer(vnode->permit_cache)); 841 key_put(vnode->silly_key); 842 vnode->silly_key = NULL; 843 key_put(vnode->lock_key); 844 vnode->lock_key = NULL; 845 _leave(""); 846} 847 848static void afs_setattr_success(struct afs_operation *op) 849{ 850 struct afs_vnode_param *vp = &op->file[0]; 851 struct inode *inode = &vp->vnode->netfs.inode; 852 loff_t old_i_size = i_size_read(inode); 853 854 op->setattr.old_i_size = old_i_size; 855 afs_vnode_commit_status(op, vp); 856 /* inode->i_size has now been changed. */ 857 858 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 859 loff_t size = op->setattr.attr->ia_size; 860 if (size > old_i_size) 861 pagecache_isize_extended(inode, old_i_size, size); 862 } 863} 864 865static void afs_setattr_edit_file(struct afs_operation *op) 866{ 867 struct afs_vnode_param *vp = &op->file[0]; 868 struct inode *inode = &vp->vnode->netfs.inode; 869 870 if (op->setattr.attr->ia_valid & ATTR_SIZE) { 871 loff_t size = op->setattr.attr->ia_size; 872 loff_t i_size = op->setattr.old_i_size; 873 874 if (size < i_size) 875 truncate_pagecache(inode, size); 876 if (size != i_size) 877 fscache_resize_cookie(afs_vnode_cache(vp->vnode), 878 vp->scb.status.size); 879 } 880} 881 882static const struct afs_operation_ops afs_setattr_operation = { 883 .issue_afs_rpc = afs_fs_setattr, 884 .issue_yfs_rpc = yfs_fs_setattr, 885 .success = afs_setattr_success, 886 .edit_dir = afs_setattr_edit_file, 887}; 888 889/* 890 * set the attributes of an inode 891 */ 892int afs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 893 struct iattr *attr) 894{ 895 const unsigned int supported = 896 ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | 897 ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH; 898 struct afs_operation *op; 899 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 900 struct inode *inode = &vnode->netfs.inode; 901 loff_t i_size; 902 int ret; 903 904 _enter("{%llx:%llu},{n=%pd},%x", 905 vnode->fid.vid, vnode->fid.vnode, dentry, 906 attr->ia_valid); 907 908 if (!(attr->ia_valid & supported)) { 909 _leave(" = 0 [unsupported]"); 910 return 0; 911 } 912 913 i_size = i_size_read(inode); 914 if (attr->ia_valid & ATTR_SIZE) { 915 if (!S_ISREG(inode->i_mode)) 916 return -EISDIR; 917 918 ret = inode_newsize_ok(inode, attr->ia_size); 919 if (ret) 920 return ret; 921 922 if (attr->ia_size == i_size) 923 attr->ia_valid &= ~ATTR_SIZE; 924 } 925 926 fscache_use_cookie(afs_vnode_cache(vnode), true); 927 928 /* Prevent any new writebacks from starting whilst we do this. */ 929 down_write(&vnode->validate_lock); 930 931 if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) { 932 loff_t size = attr->ia_size; 933 934 /* Wait for any outstanding writes to the server to complete */ 935 loff_t from = min(size, i_size); 936 loff_t to = max(size, i_size); 937 ret = filemap_fdatawait_range(inode->i_mapping, from, to); 938 if (ret < 0) 939 goto out_unlock; 940 941 /* Don't talk to the server if we're just shortening in-memory 942 * writes that haven't gone to the server yet. 943 */ 944 if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) && 945 attr->ia_size < i_size && 946 attr->ia_size > vnode->status.size) { 947 truncate_pagecache(inode, attr->ia_size); 948 fscache_resize_cookie(afs_vnode_cache(vnode), 949 attr->ia_size); 950 i_size_write(inode, attr->ia_size); 951 ret = 0; 952 goto out_unlock; 953 } 954 } 955 956 op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ? 957 afs_file_key(attr->ia_file) : NULL), 958 vnode->volume); 959 if (IS_ERR(op)) { 960 ret = PTR_ERR(op); 961 goto out_unlock; 962 } 963 964 afs_op_set_vnode(op, 0, vnode); 965 op->setattr.attr = attr; 966 967 if (attr->ia_valid & ATTR_SIZE) { 968 op->file[0].dv_delta = 1; 969 op->file[0].set_size = true; 970 } 971 op->ctime = attr->ia_ctime; 972 op->file[0].update_ctime = 1; 973 op->file[0].modification = true; 974 975 op->ops = &afs_setattr_operation; 976 ret = afs_do_sync_operation(op); 977 978out_unlock: 979 up_write(&vnode->validate_lock); 980 fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL); 981 _leave(" = %d", ret); 982 return ret; 983} 984