1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* dir.c: AFS filesystem directory handling 3 * 4 * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved. 5 * Written by David Howells (dhowells@redhat.com) 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/fs.h> 10 #include <linux/namei.h> 11 #include <linux/pagemap.h> 12 #include <linux/swap.h> 13 #include <linux/ctype.h> 14 #include <linux/sched.h> 15 #include <linux/task_io_accounting_ops.h> 16 #include "internal.h" 17 #include "afs_fs.h" 18 #include "xdr_fs.h" 19 20 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 21 unsigned int flags); 22 static int afs_dir_open(struct inode *inode, struct file *file); 23 static int afs_readdir(struct file *file, struct dir_context *ctx); 24 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 25 static int afs_d_delete(const struct dentry *dentry); 26 static void afs_d_iput(struct dentry *dentry, struct inode *inode); 27 static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 28 loff_t fpos, u64 ino, unsigned dtype); 29 static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 30 loff_t fpos, u64 ino, unsigned dtype); 31 static int afs_create(struct mnt_idmap *idmap, struct inode *dir, 32 struct dentry *dentry, umode_t mode, bool excl); 33 static int afs_mkdir(struct mnt_idmap *idmap, struct inode *dir, 34 struct dentry *dentry, umode_t mode); 35 static int afs_rmdir(struct inode *dir, struct dentry *dentry); 36 static int afs_unlink(struct inode *dir, struct dentry *dentry); 37 static int afs_link(struct dentry *from, struct inode *dir, 38 struct dentry *dentry); 39 static int afs_symlink(struct mnt_idmap *idmap, struct inode *dir, 40 struct dentry *dentry, const char *content); 41 static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir, 42 struct dentry *old_dentry, struct inode *new_dir, 43 struct dentry *new_dentry, unsigned int flags); 44 static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags); 45 static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, 46 size_t length); 47 48 static bool afs_dir_dirty_folio(struct address_space *mapping, 49 struct folio *folio) 50 { 51 BUG(); /* This should never happen. */ 52 } 53 54 const struct file_operations afs_dir_file_operations = { 55 .open = afs_dir_open, 56 .release = afs_release, 57 .iterate_shared = afs_readdir, 58 .lock = afs_lock, 59 .llseek = generic_file_llseek, 60 }; 61 62 const struct inode_operations afs_dir_inode_operations = { 63 .create = afs_create, 64 .lookup = afs_lookup, 65 .link = afs_link, 66 .unlink = afs_unlink, 67 .symlink = afs_symlink, 68 .mkdir = afs_mkdir, 69 .rmdir = afs_rmdir, 70 .rename = afs_rename, 71 .permission = afs_permission, 72 .getattr = afs_getattr, 73 .setattr = afs_setattr, 74 }; 75 76 const struct address_space_operations afs_dir_aops = { 77 .dirty_folio = afs_dir_dirty_folio, 78 .release_folio = afs_dir_release_folio, 79 .invalidate_folio = afs_dir_invalidate_folio, 80 .migrate_folio = filemap_migrate_folio, 81 }; 82 83 const struct dentry_operations afs_fs_dentry_operations = { 84 .d_revalidate = afs_d_revalidate, 85 .d_delete = afs_d_delete, 86 .d_release = afs_d_release, 87 .d_automount = afs_d_automount, 88 .d_iput = afs_d_iput, 89 }; 90 91 struct afs_lookup_one_cookie { 92 struct dir_context ctx; 93 struct qstr name; 94 bool found; 95 struct afs_fid fid; 96 }; 97 98 struct afs_lookup_cookie { 99 struct dir_context ctx; 100 struct qstr name; 101 bool found; 102 bool one_only; 103 unsigned short nr_fids; 104 struct afs_fid fids[50]; 105 }; 106 107 /* 108 * Drop the refs that we're holding on the folios we were reading into. We've 109 * got refs on the first nr_pages pages. 110 */ 111 static void afs_dir_read_cleanup(struct afs_read *req) 112 { 113 struct address_space *mapping = req->vnode->netfs.inode.i_mapping; 114 struct folio *folio; 115 pgoff_t last = req->nr_pages - 1; 116 117 XA_STATE(xas, &mapping->i_pages, 0); 118 119 if (unlikely(!req->nr_pages)) 120 return; 121 122 rcu_read_lock(); 123 xas_for_each(&xas, folio, last) { 124 if (xas_retry(&xas, folio)) 125 continue; 126 BUG_ON(xa_is_value(folio)); 127 ASSERTCMP(folio_file_mapping(folio), ==, mapping); 128 129 folio_put(folio); 130 } 131 132 rcu_read_unlock(); 133 } 134 135 /* 136 * check that a directory folio is valid 137 */ 138 static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio, 139 loff_t i_size) 140 { 141 union afs_xdr_dir_block *block; 142 size_t offset, size; 143 loff_t pos; 144 145 /* Determine how many magic numbers there should be in this folio, but 146 * we must take care because the directory may change size under us. 147 */ 148 pos = folio_pos(folio); 149 if (i_size <= pos) 150 goto checked; 151 152 size = min_t(loff_t, folio_size(folio), i_size - pos); 153 for (offset = 0; offset < size; offset += sizeof(*block)) { 154 block = kmap_local_folio(folio, offset); 155 if (block->hdr.magic != AFS_DIR_MAGIC) { 156 printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n", 157 __func__, dvnode->netfs.inode.i_ino, 158 pos, offset, size, ntohs(block->hdr.magic)); 159 trace_afs_dir_check_failed(dvnode, pos + offset, i_size); 160 kunmap_local(block); 161 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 162 goto error; 163 } 164 165 /* Make sure each block is NUL terminated so we can reasonably 166 * use string functions on it. The filenames in the folio 167 * *should* be NUL-terminated anyway. 168 */ 169 ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0; 170 171 kunmap_local(block); 172 } 173 checked: 174 afs_stat_v(dvnode, n_read_dir); 175 return true; 176 177 error: 178 return false; 179 } 180 181 /* 182 * Dump the contents of a directory. 183 */ 184 static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req) 185 { 186 union afs_xdr_dir_block *block; 187 struct address_space *mapping = dvnode->netfs.inode.i_mapping; 188 struct folio *folio; 189 pgoff_t last = req->nr_pages - 1; 190 size_t offset, size; 191 192 XA_STATE(xas, &mapping->i_pages, 0); 193 194 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n", 195 dvnode->fid.vid, dvnode->fid.vnode, 196 req->file_size, req->len, req->actual_len); 197 pr_warn("DIR %llx %x %zx %zx\n", 198 req->pos, req->nr_pages, 199 req->iter->iov_offset, iov_iter_count(req->iter)); 200 201 xas_for_each(&xas, folio, last) { 202 if (xas_retry(&xas, folio)) 203 continue; 204 205 BUG_ON(folio_file_mapping(folio) != mapping); 206 207 size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio)); 208 for (offset = 0; offset < size; offset += sizeof(*block)) { 209 block = kmap_local_folio(folio, offset); 210 pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block); 211 kunmap_local(block); 212 } 213 } 214 } 215 216 /* 217 * Check all the blocks in a directory. All the folios are held pinned. 218 */ 219 static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req) 220 { 221 struct address_space *mapping = dvnode->netfs.inode.i_mapping; 222 struct folio *folio; 223 pgoff_t last = req->nr_pages - 1; 224 int ret = 0; 225 226 XA_STATE(xas, &mapping->i_pages, 0); 227 228 if (unlikely(!req->nr_pages)) 229 return 0; 230 231 rcu_read_lock(); 232 xas_for_each(&xas, folio, last) { 233 if (xas_retry(&xas, folio)) 234 continue; 235 236 BUG_ON(folio_file_mapping(folio) != mapping); 237 238 if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) { 239 afs_dir_dump(dvnode, req); 240 ret = -EIO; 241 break; 242 } 243 } 244 245 rcu_read_unlock(); 246 return ret; 247 } 248 249 /* 250 * open an AFS directory file 251 */ 252 static int afs_dir_open(struct inode *inode, struct file *file) 253 { 254 _enter("{%lu}", inode->i_ino); 255 256 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 257 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 258 259 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 260 return -ENOENT; 261 262 return afs_open(inode, file); 263 } 264 265 /* 266 * Read the directory into the pagecache in one go, scrubbing the previous 267 * contents. The list of folios is returned, pinning them so that they don't 268 * get reclaimed during the iteration. 269 */ 270 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 271 __acquires(&dvnode->validate_lock) 272 { 273 struct address_space *mapping = dvnode->netfs.inode.i_mapping; 274 struct afs_read *req; 275 loff_t i_size; 276 int nr_pages, i; 277 int ret; 278 loff_t remote_size = 0; 279 280 _enter(""); 281 282 req = kzalloc(sizeof(*req), GFP_KERNEL); 283 if (!req) 284 return ERR_PTR(-ENOMEM); 285 286 refcount_set(&req->usage, 1); 287 req->vnode = dvnode; 288 req->key = key_get(key); 289 req->cleanup = afs_dir_read_cleanup; 290 291 expand: 292 i_size = i_size_read(&dvnode->netfs.inode); 293 if (i_size < remote_size) 294 i_size = remote_size; 295 if (i_size < 2048) { 296 ret = afs_bad(dvnode, afs_file_error_dir_small); 297 goto error; 298 } 299 if (i_size > 2048 * 1024) { 300 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 301 ret = -EFBIG; 302 goto error; 303 } 304 305 _enter("%llu", i_size); 306 307 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 308 309 req->actual_len = i_size; /* May change */ 310 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 311 req->data_version = dvnode->status.data_version; /* May change */ 312 iov_iter_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages, 313 0, i_size); 314 req->iter = &req->def_iter; 315 316 /* Fill in any gaps that we might find where the memory reclaimer has 317 * been at work and pin all the folios. If there are any gaps, we will 318 * need to reread the entire directory contents. 319 */ 320 i = req->nr_pages; 321 while (i < nr_pages) { 322 struct folio *folio; 323 324 folio = filemap_get_folio(mapping, i); 325 if (IS_ERR(folio)) { 326 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 327 afs_stat_v(dvnode, n_inval); 328 folio = __filemap_get_folio(mapping, 329 i, FGP_LOCK | FGP_CREAT, 330 mapping->gfp_mask); 331 if (IS_ERR(folio)) { 332 ret = PTR_ERR(folio); 333 goto error; 334 } 335 folio_attach_private(folio, (void *)1); 336 folio_unlock(folio); 337 } 338 339 req->nr_pages += folio_nr_pages(folio); 340 i += folio_nr_pages(folio); 341 } 342 343 /* If we're going to reload, we need to lock all the pages to prevent 344 * races. 345 */ 346 ret = -ERESTARTSYS; 347 if (down_read_killable(&dvnode->validate_lock) < 0) 348 goto error; 349 350 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 351 goto success; 352 353 up_read(&dvnode->validate_lock); 354 if (down_write_killable(&dvnode->validate_lock) < 0) 355 goto error; 356 357 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 358 trace_afs_reload_dir(dvnode); 359 ret = afs_fetch_data(dvnode, req); 360 if (ret < 0) 361 goto error_unlock; 362 363 task_io_account_read(PAGE_SIZE * req->nr_pages); 364 365 if (req->len < req->file_size) { 366 /* The content has grown, so we need to expand the 367 * buffer. 368 */ 369 up_write(&dvnode->validate_lock); 370 remote_size = req->file_size; 371 goto expand; 372 } 373 374 /* Validate the data we just read. */ 375 ret = afs_dir_check(dvnode, req); 376 if (ret < 0) 377 goto error_unlock; 378 379 // TODO: Trim excess pages 380 381 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 382 } 383 384 downgrade_write(&dvnode->validate_lock); 385 success: 386 return req; 387 388 error_unlock: 389 up_write(&dvnode->validate_lock); 390 error: 391 afs_put_read(req); 392 _leave(" = %d", ret); 393 return ERR_PTR(ret); 394 } 395 396 /* 397 * deal with one block in an AFS directory 398 */ 399 static int afs_dir_iterate_block(struct afs_vnode *dvnode, 400 struct dir_context *ctx, 401 union afs_xdr_dir_block *block, 402 unsigned blkoff) 403 { 404 union afs_xdr_dirent *dire; 405 unsigned offset, next, curr, nr_slots; 406 size_t nlen; 407 int tmp; 408 409 _enter("%llx,%x", ctx->pos, blkoff); 410 411 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 412 413 /* walk through the block, an entry at a time */ 414 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 415 offset < AFS_DIR_SLOTS_PER_BLOCK; 416 offset = next 417 ) { 418 /* skip entries marked unused in the bitmap */ 419 if (!(block->hdr.bitmap[offset / 8] & 420 (1 << (offset % 8)))) { 421 _debug("ENT[%zu.%u]: unused", 422 blkoff / sizeof(union afs_xdr_dir_block), offset); 423 next = offset + 1; 424 if (offset >= curr) 425 ctx->pos = blkoff + 426 next * sizeof(union afs_xdr_dirent); 427 continue; 428 } 429 430 /* got a valid entry */ 431 dire = &block->dirents[offset]; 432 nlen = strnlen(dire->u.name, 433 sizeof(*block) - 434 offset * sizeof(union afs_xdr_dirent)); 435 if (nlen > AFSNAMEMAX - 1) { 436 _debug("ENT[%zu]: name too long (len %u/%zu)", 437 blkoff / sizeof(union afs_xdr_dir_block), 438 offset, nlen); 439 return afs_bad(dvnode, afs_file_error_dir_name_too_long); 440 } 441 442 _debug("ENT[%zu.%u]: %s %zu \"%s\"", 443 blkoff / sizeof(union afs_xdr_dir_block), offset, 444 (offset < curr ? "skip" : "fill"), 445 nlen, dire->u.name); 446 447 nr_slots = afs_dir_calc_slots(nlen); 448 next = offset + nr_slots; 449 if (next > AFS_DIR_SLOTS_PER_BLOCK) { 450 _debug("ENT[%zu.%u]:" 451 " %u extends beyond end dir block" 452 " (len %zu)", 453 blkoff / sizeof(union afs_xdr_dir_block), 454 offset, next, nlen); 455 return afs_bad(dvnode, afs_file_error_dir_over_end); 456 } 457 458 /* Check that the name-extension dirents are all allocated */ 459 for (tmp = 1; tmp < nr_slots; tmp++) { 460 unsigned int ix = offset + tmp; 461 if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) { 462 _debug("ENT[%zu.u]:" 463 " %u unmarked extension (%u/%u)", 464 blkoff / sizeof(union afs_xdr_dir_block), 465 offset, tmp, nr_slots); 466 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 467 } 468 } 469 470 /* skip if starts before the current position */ 471 if (offset < curr) { 472 if (next > curr) 473 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 474 continue; 475 } 476 477 /* found the next entry */ 478 if (!dir_emit(ctx, dire->u.name, nlen, 479 ntohl(dire->u.vnode), 480 (ctx->actor == afs_lookup_filldir || 481 ctx->actor == afs_lookup_one_filldir)? 482 ntohl(dire->u.unique) : DT_UNKNOWN)) { 483 _leave(" = 0 [full]"); 484 return 0; 485 } 486 487 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 488 } 489 490 _leave(" = 1 [more]"); 491 return 1; 492 } 493 494 /* 495 * iterate through the data blob that lists the contents of an AFS directory 496 */ 497 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 498 struct key *key, afs_dataversion_t *_dir_version) 499 { 500 struct afs_vnode *dvnode = AFS_FS_I(dir); 501 union afs_xdr_dir_block *dblock; 502 struct afs_read *req; 503 struct folio *folio; 504 unsigned offset, size; 505 int ret; 506 507 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 508 509 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 510 _leave(" = -ESTALE"); 511 return -ESTALE; 512 } 513 514 req = afs_read_dir(dvnode, key); 515 if (IS_ERR(req)) 516 return PTR_ERR(req); 517 *_dir_version = req->data_version; 518 519 /* round the file position up to the next entry boundary */ 520 ctx->pos += sizeof(union afs_xdr_dirent) - 1; 521 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 522 523 /* walk through the blocks in sequence */ 524 ret = 0; 525 while (ctx->pos < req->actual_len) { 526 /* Fetch the appropriate folio from the directory and re-add it 527 * to the LRU. We have all the pages pinned with an extra ref. 528 */ 529 folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE, 530 FGP_ACCESSED, 0); 531 if (IS_ERR(folio)) { 532 ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 533 break; 534 } 535 536 offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio); 537 size = min_t(loff_t, folio_size(folio), 538 req->actual_len - folio_file_pos(folio)); 539 540 do { 541 dblock = kmap_local_folio(folio, offset); 542 ret = afs_dir_iterate_block(dvnode, ctx, dblock, 543 folio_file_pos(folio) + offset); 544 kunmap_local(dblock); 545 if (ret != 1) 546 goto out; 547 548 } while (offset += sizeof(*dblock), offset < size); 549 550 ret = 0; 551 } 552 553 out: 554 up_read(&dvnode->validate_lock); 555 afs_put_read(req); 556 _leave(" = %d", ret); 557 return ret; 558 } 559 560 /* 561 * read an AFS directory 562 */ 563 static int afs_readdir(struct file *file, struct dir_context *ctx) 564 { 565 afs_dataversion_t dir_version; 566 567 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 568 &dir_version); 569 } 570 571 /* 572 * Search the directory for a single name 573 * - if afs_dir_iterate_block() spots this function, it'll pass the FID 574 * uniquifier through dtype 575 */ 576 static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 577 int nlen, loff_t fpos, u64 ino, unsigned dtype) 578 { 579 struct afs_lookup_one_cookie *cookie = 580 container_of(ctx, struct afs_lookup_one_cookie, ctx); 581 582 _enter("{%s,%u},%s,%u,,%llu,%u", 583 cookie->name.name, cookie->name.len, name, nlen, 584 (unsigned long long) ino, dtype); 585 586 /* insanity checks first */ 587 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 588 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 589 590 if (cookie->name.len != nlen || 591 memcmp(cookie->name.name, name, nlen) != 0) { 592 _leave(" = true [keep looking]"); 593 return true; 594 } 595 596 cookie->fid.vnode = ino; 597 cookie->fid.unique = dtype; 598 cookie->found = 1; 599 600 _leave(" = false [found]"); 601 return false; 602 } 603 604 /* 605 * Do a lookup of a single name in a directory 606 * - just returns the FID the dentry name maps to if found 607 */ 608 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 609 struct afs_fid *fid, struct key *key, 610 afs_dataversion_t *_dir_version) 611 { 612 struct afs_super_info *as = dir->i_sb->s_fs_info; 613 struct afs_lookup_one_cookie cookie = { 614 .ctx.actor = afs_lookup_one_filldir, 615 .name = dentry->d_name, 616 .fid.vid = as->volume->vid 617 }; 618 int ret; 619 620 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 621 622 /* search the directory */ 623 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 624 if (ret < 0) { 625 _leave(" = %d [iter]", ret); 626 return ret; 627 } 628 629 if (!cookie.found) { 630 _leave(" = -ENOENT [not found]"); 631 return -ENOENT; 632 } 633 634 *fid = cookie.fid; 635 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 636 return 0; 637 } 638 639 /* 640 * search the directory for a name 641 * - if afs_dir_iterate_block() spots this function, it'll pass the FID 642 * uniquifier through dtype 643 */ 644 static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, 645 int nlen, loff_t fpos, u64 ino, unsigned dtype) 646 { 647 struct afs_lookup_cookie *cookie = 648 container_of(ctx, struct afs_lookup_cookie, ctx); 649 650 _enter("{%s,%u},%s,%u,,%llu,%u", 651 cookie->name.name, cookie->name.len, name, nlen, 652 (unsigned long long) ino, dtype); 653 654 /* insanity checks first */ 655 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 656 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 657 658 if (cookie->found) { 659 if (cookie->nr_fids < 50) { 660 cookie->fids[cookie->nr_fids].vnode = ino; 661 cookie->fids[cookie->nr_fids].unique = dtype; 662 cookie->nr_fids++; 663 } 664 } else if (cookie->name.len == nlen && 665 memcmp(cookie->name.name, name, nlen) == 0) { 666 cookie->fids[1].vnode = ino; 667 cookie->fids[1].unique = dtype; 668 cookie->found = 1; 669 if (cookie->one_only) 670 return false; 671 } 672 673 return cookie->nr_fids < 50; 674 } 675 676 /* 677 * Deal with the result of a successful lookup operation. Turn all the files 678 * into inodes and save the first one - which is the one we actually want. 679 */ 680 static void afs_do_lookup_success(struct afs_operation *op) 681 { 682 struct afs_vnode_param *vp; 683 struct afs_vnode *vnode; 684 struct inode *inode; 685 u32 abort_code; 686 int i; 687 688 _enter(""); 689 690 for (i = 0; i < op->nr_files; i++) { 691 switch (i) { 692 case 0: 693 vp = &op->file[0]; 694 abort_code = vp->scb.status.abort_code; 695 if (abort_code != 0) { 696 op->ac.abort_code = abort_code; 697 op->error = afs_abort_to_error(abort_code); 698 } 699 break; 700 701 case 1: 702 vp = &op->file[1]; 703 break; 704 705 default: 706 vp = &op->more_files[i - 2]; 707 break; 708 } 709 710 if (!vp->scb.have_status && !vp->scb.have_error) 711 continue; 712 713 _debug("do [%u]", i); 714 if (vp->vnode) { 715 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) 716 afs_vnode_commit_status(op, vp); 717 } else if (vp->scb.status.abort_code == 0) { 718 inode = afs_iget(op, vp); 719 if (!IS_ERR(inode)) { 720 vnode = AFS_FS_I(inode); 721 afs_cache_permit(vnode, op->key, 722 0 /* Assume vnode->cb_break is 0 */ + 723 op->cb_v_break, 724 &vp->scb); 725 vp->vnode = vnode; 726 vp->put_vnode = true; 727 } 728 } else { 729 _debug("- abort %d %llx:%llx.%x", 730 vp->scb.status.abort_code, 731 vp->fid.vid, vp->fid.vnode, vp->fid.unique); 732 } 733 } 734 735 _leave(""); 736 } 737 738 static const struct afs_operation_ops afs_inline_bulk_status_operation = { 739 .issue_afs_rpc = afs_fs_inline_bulk_status, 740 .issue_yfs_rpc = yfs_fs_inline_bulk_status, 741 .success = afs_do_lookup_success, 742 }; 743 744 static const struct afs_operation_ops afs_lookup_fetch_status_operation = { 745 .issue_afs_rpc = afs_fs_fetch_status, 746 .issue_yfs_rpc = yfs_fs_fetch_status, 747 .success = afs_do_lookup_success, 748 .aborted = afs_check_for_remote_deletion, 749 }; 750 751 /* 752 * See if we know that the server we expect to use doesn't support 753 * FS.InlineBulkStatus. 754 */ 755 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) 756 { 757 struct afs_server_list *slist; 758 struct afs_volume *volume = dvnode->volume; 759 struct afs_server *server; 760 bool ret = true; 761 int i; 762 763 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) 764 return true; 765 766 rcu_read_lock(); 767 slist = rcu_dereference(volume->servers); 768 769 for (i = 0; i < slist->nr_servers; i++) { 770 server = slist->servers[i].server; 771 if (server == dvnode->cb_server) { 772 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 773 ret = false; 774 break; 775 } 776 } 777 778 rcu_read_unlock(); 779 return ret; 780 } 781 782 /* 783 * Do a lookup in a directory. We make use of bulk lookup to query a slew of 784 * files in one go and create inodes for them. The inode of the file we were 785 * asked for is returned. 786 */ 787 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 788 struct key *key) 789 { 790 struct afs_lookup_cookie *cookie; 791 struct afs_vnode_param *vp; 792 struct afs_operation *op; 793 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 794 struct inode *inode = NULL, *ti; 795 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 796 long ret; 797 int i; 798 799 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 800 801 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 802 if (!cookie) 803 return ERR_PTR(-ENOMEM); 804 805 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) 806 cookie->fids[i].vid = dvnode->fid.vid; 807 cookie->ctx.actor = afs_lookup_filldir; 808 cookie->name = dentry->d_name; 809 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want 810 * and slot 1 for the directory */ 811 812 if (!afs_server_supports_ibulk(dvnode)) 813 cookie->one_only = true; 814 815 /* search the directory */ 816 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 817 if (ret < 0) 818 goto out; 819 820 dentry->d_fsdata = (void *)(unsigned long)data_version; 821 822 ret = -ENOENT; 823 if (!cookie->found) 824 goto out; 825 826 /* Check to see if we already have an inode for the primary fid. */ 827 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, 828 afs_ilookup5_test_by_fid, &cookie->fids[1]); 829 if (inode) 830 goto out; /* We do */ 831 832 /* Okay, we didn't find it. We need to query the server - and whilst 833 * we're doing that, we're going to attempt to look up a bunch of other 834 * vnodes also. 835 */ 836 op = afs_alloc_operation(NULL, dvnode->volume); 837 if (IS_ERR(op)) { 838 ret = PTR_ERR(op); 839 goto out; 840 } 841 842 afs_op_set_vnode(op, 0, dvnode); 843 afs_op_set_fid(op, 1, &cookie->fids[1]); 844 845 op->nr_files = cookie->nr_fids; 846 _debug("nr_files %u", op->nr_files); 847 848 /* Need space for examining all the selected files */ 849 op->error = -ENOMEM; 850 if (op->nr_files > 2) { 851 op->more_files = kvcalloc(op->nr_files - 2, 852 sizeof(struct afs_vnode_param), 853 GFP_KERNEL); 854 if (!op->more_files) 855 goto out_op; 856 857 for (i = 2; i < op->nr_files; i++) { 858 vp = &op->more_files[i - 2]; 859 vp->fid = cookie->fids[i]; 860 861 /* Find any inodes that already exist and get their 862 * callback counters. 863 */ 864 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, 865 afs_ilookup5_test_by_fid, &vp->fid); 866 if (!IS_ERR_OR_NULL(ti)) { 867 vnode = AFS_FS_I(ti); 868 vp->dv_before = vnode->status.data_version; 869 vp->cb_break_before = afs_calc_vnode_cb_break(vnode); 870 vp->vnode = vnode; 871 vp->put_vnode = true; 872 vp->speculative = true; /* vnode not locked */ 873 } 874 } 875 } 876 877 /* Try FS.InlineBulkStatus first. Abort codes for the individual 878 * lookups contained therein are stored in the reply without aborting 879 * the whole operation. 880 */ 881 op->error = -ENOTSUPP; 882 if (!cookie->one_only) { 883 op->ops = &afs_inline_bulk_status_operation; 884 afs_begin_vnode_operation(op); 885 afs_wait_for_operation(op); 886 } 887 888 if (op->error == -ENOTSUPP) { 889 /* We could try FS.BulkStatus next, but this aborts the entire 890 * op if any of the lookups fails - so, for the moment, revert 891 * to FS.FetchStatus for op->file[1]. 892 */ 893 op->fetch_status.which = 1; 894 op->ops = &afs_lookup_fetch_status_operation; 895 afs_begin_vnode_operation(op); 896 afs_wait_for_operation(op); 897 } 898 inode = ERR_PTR(op->error); 899 900 out_op: 901 if (op->error == 0) { 902 inode = &op->file[1].vnode->netfs.inode; 903 op->file[1].vnode = NULL; 904 } 905 906 if (op->file[0].scb.have_status) 907 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; 908 else 909 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; 910 ret = afs_put_operation(op); 911 out: 912 kfree(cookie); 913 _leave(""); 914 return inode ?: ERR_PTR(ret); 915 } 916 917 /* 918 * Look up an entry in a directory with @sys substitution. 919 */ 920 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 921 struct key *key) 922 { 923 struct afs_sysnames *subs; 924 struct afs_net *net = afs_i2net(dir); 925 struct dentry *ret; 926 char *buf, *p, *name; 927 int len, i; 928 929 _enter(""); 930 931 ret = ERR_PTR(-ENOMEM); 932 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 933 if (!buf) 934 goto out_p; 935 if (dentry->d_name.len > 4) { 936 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 937 p += dentry->d_name.len - 4; 938 } 939 940 /* There is an ordered list of substitutes that we have to try. */ 941 read_lock(&net->sysnames_lock); 942 subs = net->sysnames; 943 refcount_inc(&subs->usage); 944 read_unlock(&net->sysnames_lock); 945 946 for (i = 0; i < subs->nr; i++) { 947 name = subs->subs[i]; 948 len = dentry->d_name.len - 4 + strlen(name); 949 if (len >= AFSNAMEMAX) { 950 ret = ERR_PTR(-ENAMETOOLONG); 951 goto out_s; 952 } 953 954 strcpy(p, name); 955 ret = lookup_one_len(buf, dentry->d_parent, len); 956 if (IS_ERR(ret) || d_is_positive(ret)) 957 goto out_s; 958 dput(ret); 959 } 960 961 /* We don't want to d_add() the @sys dentry here as we don't want to 962 * the cached dentry to hide changes to the sysnames list. 963 */ 964 ret = NULL; 965 out_s: 966 afs_put_sysnames(subs); 967 kfree(buf); 968 out_p: 969 key_put(key); 970 return ret; 971 } 972 973 /* 974 * look up an entry in a directory 975 */ 976 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 977 unsigned int flags) 978 { 979 struct afs_vnode *dvnode = AFS_FS_I(dir); 980 struct afs_fid fid = {}; 981 struct inode *inode; 982 struct dentry *d; 983 struct key *key; 984 int ret; 985 986 _enter("{%llx:%llu},%p{%pd},", 987 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 988 989 ASSERTCMP(d_inode(dentry), ==, NULL); 990 991 if (dentry->d_name.len >= AFSNAMEMAX) { 992 _leave(" = -ENAMETOOLONG"); 993 return ERR_PTR(-ENAMETOOLONG); 994 } 995 996 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 997 _leave(" = -ESTALE"); 998 return ERR_PTR(-ESTALE); 999 } 1000 1001 key = afs_request_key(dvnode->volume->cell); 1002 if (IS_ERR(key)) { 1003 _leave(" = %ld [key]", PTR_ERR(key)); 1004 return ERR_CAST(key); 1005 } 1006 1007 ret = afs_validate(dvnode, key); 1008 if (ret < 0) { 1009 key_put(key); 1010 _leave(" = %d [val]", ret); 1011 return ERR_PTR(ret); 1012 } 1013 1014 if (dentry->d_name.len >= 4 && 1015 dentry->d_name.name[dentry->d_name.len - 4] == '@' && 1016 dentry->d_name.name[dentry->d_name.len - 3] == 's' && 1017 dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 1018 dentry->d_name.name[dentry->d_name.len - 1] == 's') 1019 return afs_lookup_atsys(dir, dentry, key); 1020 1021 afs_stat_v(dvnode, n_lookup); 1022 inode = afs_do_lookup(dir, dentry, key); 1023 key_put(key); 1024 if (inode == ERR_PTR(-ENOENT)) 1025 inode = afs_try_auto_mntpt(dentry, dir); 1026 1027 if (!IS_ERR_OR_NULL(inode)) 1028 fid = AFS_FS_I(inode)->fid; 1029 1030 _debug("splice %p", dentry->d_inode); 1031 d = d_splice_alias(inode, dentry); 1032 if (!IS_ERR_OR_NULL(d)) { 1033 d->d_fsdata = dentry->d_fsdata; 1034 trace_afs_lookup(dvnode, &d->d_name, &fid); 1035 } else { 1036 trace_afs_lookup(dvnode, &dentry->d_name, &fid); 1037 } 1038 _leave(""); 1039 return d; 1040 } 1041 1042 /* 1043 * Check the validity of a dentry under RCU conditions. 1044 */ 1045 static int afs_d_revalidate_rcu(struct dentry *dentry) 1046 { 1047 struct afs_vnode *dvnode; 1048 struct dentry *parent; 1049 struct inode *dir; 1050 long dir_version, de_version; 1051 1052 _enter("%p", dentry); 1053 1054 /* Check the parent directory is still valid first. */ 1055 parent = READ_ONCE(dentry->d_parent); 1056 dir = d_inode_rcu(parent); 1057 if (!dir) 1058 return -ECHILD; 1059 dvnode = AFS_FS_I(dir); 1060 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 1061 return -ECHILD; 1062 1063 if (!afs_check_validity(dvnode)) 1064 return -ECHILD; 1065 1066 /* We only need to invalidate a dentry if the server's copy changed 1067 * behind our back. If we made the change, it's no problem. Note that 1068 * on a 32-bit system, we only have 32 bits in the dentry to store the 1069 * version. 1070 */ 1071 dir_version = (long)READ_ONCE(dvnode->status.data_version); 1072 de_version = (long)READ_ONCE(dentry->d_fsdata); 1073 if (de_version != dir_version) { 1074 dir_version = (long)READ_ONCE(dvnode->invalid_before); 1075 if (de_version - dir_version < 0) 1076 return -ECHILD; 1077 } 1078 1079 return 1; /* Still valid */ 1080 } 1081 1082 /* 1083 * check that a dentry lookup hit has found a valid entry 1084 * - NOTE! the hit can be a negative hit too, so we can't assume we have an 1085 * inode 1086 */ 1087 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 1088 { 1089 struct afs_vnode *vnode, *dir; 1090 struct afs_fid fid; 1091 struct dentry *parent; 1092 struct inode *inode; 1093 struct key *key; 1094 afs_dataversion_t dir_version, invalid_before; 1095 long de_version; 1096 int ret; 1097 1098 if (flags & LOOKUP_RCU) 1099 return afs_d_revalidate_rcu(dentry); 1100 1101 if (d_really_is_positive(dentry)) { 1102 vnode = AFS_FS_I(d_inode(dentry)); 1103 _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1104 vnode->fid.vid, vnode->fid.vnode, dentry, 1105 vnode->flags); 1106 } else { 1107 _enter("{neg n=%pd}", dentry); 1108 } 1109 1110 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 1111 if (IS_ERR(key)) 1112 key = NULL; 1113 1114 /* Hold the parent dentry so we can peer at it */ 1115 parent = dget_parent(dentry); 1116 dir = AFS_FS_I(d_inode(parent)); 1117 1118 /* validate the parent directory */ 1119 afs_validate(dir, key); 1120 1121 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1122 _debug("%pd: parent dir deleted", dentry); 1123 goto not_found; 1124 } 1125 1126 /* We only need to invalidate a dentry if the server's copy changed 1127 * behind our back. If we made the change, it's no problem. Note that 1128 * on a 32-bit system, we only have 32 bits in the dentry to store the 1129 * version. 1130 */ 1131 dir_version = dir->status.data_version; 1132 de_version = (long)dentry->d_fsdata; 1133 if (de_version == (long)dir_version) 1134 goto out_valid_noupdate; 1135 1136 invalid_before = dir->invalid_before; 1137 if (de_version - (long)invalid_before >= 0) 1138 goto out_valid; 1139 1140 _debug("dir modified"); 1141 afs_stat_v(dir, n_reval); 1142 1143 /* search the directory for this vnode */ 1144 ret = afs_do_lookup_one(&dir->netfs.inode, dentry, &fid, key, &dir_version); 1145 switch (ret) { 1146 case 0: 1147 /* the filename maps to something */ 1148 if (d_really_is_negative(dentry)) 1149 goto not_found; 1150 inode = d_inode(dentry); 1151 if (is_bad_inode(inode)) { 1152 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1153 dentry); 1154 goto not_found; 1155 } 1156 1157 vnode = AFS_FS_I(inode); 1158 1159 /* if the vnode ID has changed, then the dirent points to a 1160 * different file */ 1161 if (fid.vnode != vnode->fid.vnode) { 1162 _debug("%pd: dirent changed [%llu != %llu]", 1163 dentry, fid.vnode, 1164 vnode->fid.vnode); 1165 goto not_found; 1166 } 1167 1168 /* if the vnode ID uniqifier has changed, then the file has 1169 * been deleted and replaced, and the original vnode ID has 1170 * been reused */ 1171 if (fid.unique != vnode->fid.unique) { 1172 _debug("%pd: file deleted (uq %u -> %u I:%u)", 1173 dentry, fid.unique, 1174 vnode->fid.unique, 1175 vnode->netfs.inode.i_generation); 1176 goto not_found; 1177 } 1178 goto out_valid; 1179 1180 case -ENOENT: 1181 /* the filename is unknown */ 1182 _debug("%pd: dirent not found", dentry); 1183 if (d_really_is_positive(dentry)) 1184 goto not_found; 1185 goto out_valid; 1186 1187 default: 1188 _debug("failed to iterate dir %pd: %d", 1189 parent, ret); 1190 goto not_found; 1191 } 1192 1193 out_valid: 1194 dentry->d_fsdata = (void *)(unsigned long)dir_version; 1195 out_valid_noupdate: 1196 dput(parent); 1197 key_put(key); 1198 _leave(" = 1 [valid]"); 1199 return 1; 1200 1201 not_found: 1202 _debug("dropping dentry %pd2", dentry); 1203 dput(parent); 1204 key_put(key); 1205 1206 _leave(" = 0 [bad]"); 1207 return 0; 1208 } 1209 1210 /* 1211 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 1212 * sleep) 1213 * - called from dput() when d_count is going to 0. 1214 * - return 1 to request dentry be unhashed, 0 otherwise 1215 */ 1216 static int afs_d_delete(const struct dentry *dentry) 1217 { 1218 _enter("%pd", dentry); 1219 1220 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1221 goto zap; 1222 1223 if (d_really_is_positive(dentry) && 1224 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 1225 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 1226 goto zap; 1227 1228 _leave(" = 0 [keep]"); 1229 return 0; 1230 1231 zap: 1232 _leave(" = 1 [zap]"); 1233 return 1; 1234 } 1235 1236 /* 1237 * Clean up sillyrename files on dentry removal. 1238 */ 1239 static void afs_d_iput(struct dentry *dentry, struct inode *inode) 1240 { 1241 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1242 afs_silly_iput(dentry, inode); 1243 iput(inode); 1244 } 1245 1246 /* 1247 * handle dentry release 1248 */ 1249 void afs_d_release(struct dentry *dentry) 1250 { 1251 _enter("%pd", dentry); 1252 } 1253 1254 void afs_check_for_remote_deletion(struct afs_operation *op) 1255 { 1256 struct afs_vnode *vnode = op->file[0].vnode; 1257 1258 switch (op->ac.abort_code) { 1259 case VNOVNODE: 1260 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1261 afs_break_callback(vnode, afs_cb_break_for_deleted); 1262 } 1263 } 1264 1265 /* 1266 * Create a new inode for create/mkdir/symlink 1267 */ 1268 static void afs_vnode_new_inode(struct afs_operation *op) 1269 { 1270 struct afs_vnode_param *vp = &op->file[1]; 1271 struct afs_vnode *vnode; 1272 struct inode *inode; 1273 1274 _enter(""); 1275 1276 ASSERTCMP(op->error, ==, 0); 1277 1278 inode = afs_iget(op, vp); 1279 if (IS_ERR(inode)) { 1280 /* ENOMEM or EINTR at a really inconvenient time - just abandon 1281 * the new directory on the server. 1282 */ 1283 op->error = PTR_ERR(inode); 1284 return; 1285 } 1286 1287 vnode = AFS_FS_I(inode); 1288 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1289 if (!op->error) 1290 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); 1291 d_instantiate(op->dentry, inode); 1292 } 1293 1294 static void afs_create_success(struct afs_operation *op) 1295 { 1296 _enter("op=%08x", op->debug_id); 1297 op->ctime = op->file[0].scb.status.mtime_client; 1298 afs_vnode_commit_status(op, &op->file[0]); 1299 afs_update_dentry_version(op, &op->file[0], op->dentry); 1300 afs_vnode_new_inode(op); 1301 } 1302 1303 static void afs_create_edit_dir(struct afs_operation *op) 1304 { 1305 struct afs_vnode_param *dvp = &op->file[0]; 1306 struct afs_vnode_param *vp = &op->file[1]; 1307 struct afs_vnode *dvnode = dvp->vnode; 1308 1309 _enter("op=%08x", op->debug_id); 1310 1311 down_write(&dvnode->validate_lock); 1312 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1313 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1314 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, 1315 op->create.reason); 1316 up_write(&dvnode->validate_lock); 1317 } 1318 1319 static void afs_create_put(struct afs_operation *op) 1320 { 1321 _enter("op=%08x", op->debug_id); 1322 1323 if (op->error) 1324 d_drop(op->dentry); 1325 } 1326 1327 static const struct afs_operation_ops afs_mkdir_operation = { 1328 .issue_afs_rpc = afs_fs_make_dir, 1329 .issue_yfs_rpc = yfs_fs_make_dir, 1330 .success = afs_create_success, 1331 .aborted = afs_check_for_remote_deletion, 1332 .edit_dir = afs_create_edit_dir, 1333 .put = afs_create_put, 1334 }; 1335 1336 /* 1337 * create a directory on an AFS filesystem 1338 */ 1339 static int afs_mkdir(struct mnt_idmap *idmap, struct inode *dir, 1340 struct dentry *dentry, umode_t mode) 1341 { 1342 struct afs_operation *op; 1343 struct afs_vnode *dvnode = AFS_FS_I(dir); 1344 1345 _enter("{%llx:%llu},{%pd},%ho", 1346 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1347 1348 op = afs_alloc_operation(NULL, dvnode->volume); 1349 if (IS_ERR(op)) { 1350 d_drop(dentry); 1351 return PTR_ERR(op); 1352 } 1353 1354 afs_op_set_vnode(op, 0, dvnode); 1355 op->file[0].dv_delta = 1; 1356 op->file[0].modification = true; 1357 op->file[0].update_ctime = true; 1358 op->dentry = dentry; 1359 op->create.mode = S_IFDIR | mode; 1360 op->create.reason = afs_edit_dir_for_mkdir; 1361 op->ops = &afs_mkdir_operation; 1362 return afs_do_sync_operation(op); 1363 } 1364 1365 /* 1366 * Remove a subdir from a directory. 1367 */ 1368 static void afs_dir_remove_subdir(struct dentry *dentry) 1369 { 1370 if (d_really_is_positive(dentry)) { 1371 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1372 1373 clear_nlink(&vnode->netfs.inode); 1374 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1375 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1376 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1377 } 1378 } 1379 1380 static void afs_rmdir_success(struct afs_operation *op) 1381 { 1382 _enter("op=%08x", op->debug_id); 1383 op->ctime = op->file[0].scb.status.mtime_client; 1384 afs_vnode_commit_status(op, &op->file[0]); 1385 afs_update_dentry_version(op, &op->file[0], op->dentry); 1386 } 1387 1388 static void afs_rmdir_edit_dir(struct afs_operation *op) 1389 { 1390 struct afs_vnode_param *dvp = &op->file[0]; 1391 struct afs_vnode *dvnode = dvp->vnode; 1392 1393 _enter("op=%08x", op->debug_id); 1394 afs_dir_remove_subdir(op->dentry); 1395 1396 down_write(&dvnode->validate_lock); 1397 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1398 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1399 afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1400 afs_edit_dir_for_rmdir); 1401 up_write(&dvnode->validate_lock); 1402 } 1403 1404 static void afs_rmdir_put(struct afs_operation *op) 1405 { 1406 _enter("op=%08x", op->debug_id); 1407 if (op->file[1].vnode) 1408 up_write(&op->file[1].vnode->rmdir_lock); 1409 } 1410 1411 static const struct afs_operation_ops afs_rmdir_operation = { 1412 .issue_afs_rpc = afs_fs_remove_dir, 1413 .issue_yfs_rpc = yfs_fs_remove_dir, 1414 .success = afs_rmdir_success, 1415 .aborted = afs_check_for_remote_deletion, 1416 .edit_dir = afs_rmdir_edit_dir, 1417 .put = afs_rmdir_put, 1418 }; 1419 1420 /* 1421 * remove a directory from an AFS filesystem 1422 */ 1423 static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1424 { 1425 struct afs_operation *op; 1426 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1427 int ret; 1428 1429 _enter("{%llx:%llu},{%pd}", 1430 dvnode->fid.vid, dvnode->fid.vnode, dentry); 1431 1432 op = afs_alloc_operation(NULL, dvnode->volume); 1433 if (IS_ERR(op)) 1434 return PTR_ERR(op); 1435 1436 afs_op_set_vnode(op, 0, dvnode); 1437 op->file[0].dv_delta = 1; 1438 op->file[0].modification = true; 1439 op->file[0].update_ctime = true; 1440 1441 op->dentry = dentry; 1442 op->ops = &afs_rmdir_operation; 1443 1444 /* Try to make sure we have a callback promise on the victim. */ 1445 if (d_really_is_positive(dentry)) { 1446 vnode = AFS_FS_I(d_inode(dentry)); 1447 ret = afs_validate(vnode, op->key); 1448 if (ret < 0) 1449 goto error; 1450 } 1451 1452 if (vnode) { 1453 ret = down_write_killable(&vnode->rmdir_lock); 1454 if (ret < 0) 1455 goto error; 1456 op->file[1].vnode = vnode; 1457 } 1458 1459 return afs_do_sync_operation(op); 1460 1461 error: 1462 return afs_put_operation(op); 1463 } 1464 1465 /* 1466 * Remove a link to a file or symlink from a directory. 1467 * 1468 * If the file was not deleted due to excess hard links, the fileserver will 1469 * break the callback promise on the file - if it had one - before it returns 1470 * to us, and if it was deleted, it won't 1471 * 1472 * However, if we didn't have a callback promise outstanding, or it was 1473 * outstanding on a different server, then it won't break it either... 1474 */ 1475 static void afs_dir_remove_link(struct afs_operation *op) 1476 { 1477 struct afs_vnode *dvnode = op->file[0].vnode; 1478 struct afs_vnode *vnode = op->file[1].vnode; 1479 struct dentry *dentry = op->dentry; 1480 int ret; 1481 1482 if (op->error != 0 || 1483 (op->file[1].scb.have_status && op->file[1].scb.have_error)) 1484 return; 1485 if (d_really_is_positive(dentry)) 1486 return; 1487 1488 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 1489 /* Already done */ 1490 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1491 write_seqlock(&vnode->cb_lock); 1492 drop_nlink(&vnode->netfs.inode); 1493 if (vnode->netfs.inode.i_nlink == 0) { 1494 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1495 __afs_break_callback(vnode, afs_cb_break_for_unlink); 1496 } 1497 write_sequnlock(&vnode->cb_lock); 1498 } else { 1499 afs_break_callback(vnode, afs_cb_break_for_unlink); 1500 1501 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1502 _debug("AFS_VNODE_DELETED"); 1503 1504 ret = afs_validate(vnode, op->key); 1505 if (ret != -ESTALE) 1506 op->error = ret; 1507 } 1508 1509 _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error); 1510 } 1511 1512 static void afs_unlink_success(struct afs_operation *op) 1513 { 1514 _enter("op=%08x", op->debug_id); 1515 op->ctime = op->file[0].scb.status.mtime_client; 1516 afs_check_dir_conflict(op, &op->file[0]); 1517 afs_vnode_commit_status(op, &op->file[0]); 1518 afs_vnode_commit_status(op, &op->file[1]); 1519 afs_update_dentry_version(op, &op->file[0], op->dentry); 1520 afs_dir_remove_link(op); 1521 } 1522 1523 static void afs_unlink_edit_dir(struct afs_operation *op) 1524 { 1525 struct afs_vnode_param *dvp = &op->file[0]; 1526 struct afs_vnode *dvnode = dvp->vnode; 1527 1528 _enter("op=%08x", op->debug_id); 1529 down_write(&dvnode->validate_lock); 1530 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1531 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1532 afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1533 afs_edit_dir_for_unlink); 1534 up_write(&dvnode->validate_lock); 1535 } 1536 1537 static void afs_unlink_put(struct afs_operation *op) 1538 { 1539 _enter("op=%08x", op->debug_id); 1540 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) 1541 d_rehash(op->dentry); 1542 } 1543 1544 static const struct afs_operation_ops afs_unlink_operation = { 1545 .issue_afs_rpc = afs_fs_remove_file, 1546 .issue_yfs_rpc = yfs_fs_remove_file, 1547 .success = afs_unlink_success, 1548 .aborted = afs_check_for_remote_deletion, 1549 .edit_dir = afs_unlink_edit_dir, 1550 .put = afs_unlink_put, 1551 }; 1552 1553 /* 1554 * Remove a file or symlink from an AFS filesystem. 1555 */ 1556 static int afs_unlink(struct inode *dir, struct dentry *dentry) 1557 { 1558 struct afs_operation *op; 1559 struct afs_vnode *dvnode = AFS_FS_I(dir); 1560 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1561 int ret; 1562 1563 _enter("{%llx:%llu},{%pd}", 1564 dvnode->fid.vid, dvnode->fid.vnode, dentry); 1565 1566 if (dentry->d_name.len >= AFSNAMEMAX) 1567 return -ENAMETOOLONG; 1568 1569 op = afs_alloc_operation(NULL, dvnode->volume); 1570 if (IS_ERR(op)) 1571 return PTR_ERR(op); 1572 1573 afs_op_set_vnode(op, 0, dvnode); 1574 op->file[0].dv_delta = 1; 1575 op->file[0].modification = true; 1576 op->file[0].update_ctime = true; 1577 1578 /* Try to make sure we have a callback promise on the victim. */ 1579 ret = afs_validate(vnode, op->key); 1580 if (ret < 0) { 1581 op->error = ret; 1582 goto error; 1583 } 1584 1585 spin_lock(&dentry->d_lock); 1586 if (d_count(dentry) > 1) { 1587 spin_unlock(&dentry->d_lock); 1588 /* Start asynchronous writeout of the inode */ 1589 write_inode_now(d_inode(dentry), 0); 1590 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); 1591 goto error; 1592 } 1593 if (!d_unhashed(dentry)) { 1594 /* Prevent a race with RCU lookup. */ 1595 __d_drop(dentry); 1596 op->unlink.need_rehash = true; 1597 } 1598 spin_unlock(&dentry->d_lock); 1599 1600 op->file[1].vnode = vnode; 1601 op->file[1].update_ctime = true; 1602 op->file[1].op_unlinked = true; 1603 op->dentry = dentry; 1604 op->ops = &afs_unlink_operation; 1605 afs_begin_vnode_operation(op); 1606 afs_wait_for_operation(op); 1607 1608 /* If there was a conflict with a third party, check the status of the 1609 * unlinked vnode. 1610 */ 1611 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) { 1612 op->file[1].update_ctime = false; 1613 op->fetch_status.which = 1; 1614 op->ops = &afs_fetch_status_operation; 1615 afs_begin_vnode_operation(op); 1616 afs_wait_for_operation(op); 1617 } 1618 1619 return afs_put_operation(op); 1620 1621 error: 1622 return afs_put_operation(op); 1623 } 1624 1625 static const struct afs_operation_ops afs_create_operation = { 1626 .issue_afs_rpc = afs_fs_create_file, 1627 .issue_yfs_rpc = yfs_fs_create_file, 1628 .success = afs_create_success, 1629 .aborted = afs_check_for_remote_deletion, 1630 .edit_dir = afs_create_edit_dir, 1631 .put = afs_create_put, 1632 }; 1633 1634 /* 1635 * create a regular file on an AFS filesystem 1636 */ 1637 static int afs_create(struct mnt_idmap *idmap, struct inode *dir, 1638 struct dentry *dentry, umode_t mode, bool excl) 1639 { 1640 struct afs_operation *op; 1641 struct afs_vnode *dvnode = AFS_FS_I(dir); 1642 int ret = -ENAMETOOLONG; 1643 1644 _enter("{%llx:%llu},{%pd},%ho", 1645 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1646 1647 if (dentry->d_name.len >= AFSNAMEMAX) 1648 goto error; 1649 1650 op = afs_alloc_operation(NULL, dvnode->volume); 1651 if (IS_ERR(op)) { 1652 ret = PTR_ERR(op); 1653 goto error; 1654 } 1655 1656 afs_op_set_vnode(op, 0, dvnode); 1657 op->file[0].dv_delta = 1; 1658 op->file[0].modification = true; 1659 op->file[0].update_ctime = true; 1660 1661 op->dentry = dentry; 1662 op->create.mode = S_IFREG | mode; 1663 op->create.reason = afs_edit_dir_for_create; 1664 op->ops = &afs_create_operation; 1665 return afs_do_sync_operation(op); 1666 1667 error: 1668 d_drop(dentry); 1669 _leave(" = %d", ret); 1670 return ret; 1671 } 1672 1673 static void afs_link_success(struct afs_operation *op) 1674 { 1675 struct afs_vnode_param *dvp = &op->file[0]; 1676 struct afs_vnode_param *vp = &op->file[1]; 1677 1678 _enter("op=%08x", op->debug_id); 1679 op->ctime = dvp->scb.status.mtime_client; 1680 afs_vnode_commit_status(op, dvp); 1681 afs_vnode_commit_status(op, vp); 1682 afs_update_dentry_version(op, dvp, op->dentry); 1683 if (op->dentry_2->d_parent == op->dentry->d_parent) 1684 afs_update_dentry_version(op, dvp, op->dentry_2); 1685 ihold(&vp->vnode->netfs.inode); 1686 d_instantiate(op->dentry, &vp->vnode->netfs.inode); 1687 } 1688 1689 static void afs_link_put(struct afs_operation *op) 1690 { 1691 _enter("op=%08x", op->debug_id); 1692 if (op->error) 1693 d_drop(op->dentry); 1694 } 1695 1696 static const struct afs_operation_ops afs_link_operation = { 1697 .issue_afs_rpc = afs_fs_link, 1698 .issue_yfs_rpc = yfs_fs_link, 1699 .success = afs_link_success, 1700 .aborted = afs_check_for_remote_deletion, 1701 .edit_dir = afs_create_edit_dir, 1702 .put = afs_link_put, 1703 }; 1704 1705 /* 1706 * create a hard link between files in an AFS filesystem 1707 */ 1708 static int afs_link(struct dentry *from, struct inode *dir, 1709 struct dentry *dentry) 1710 { 1711 struct afs_operation *op; 1712 struct afs_vnode *dvnode = AFS_FS_I(dir); 1713 struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1714 int ret = -ENAMETOOLONG; 1715 1716 _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1717 vnode->fid.vid, vnode->fid.vnode, 1718 dvnode->fid.vid, dvnode->fid.vnode, 1719 dentry); 1720 1721 if (dentry->d_name.len >= AFSNAMEMAX) 1722 goto error; 1723 1724 op = afs_alloc_operation(NULL, dvnode->volume); 1725 if (IS_ERR(op)) { 1726 ret = PTR_ERR(op); 1727 goto error; 1728 } 1729 1730 ret = afs_validate(vnode, op->key); 1731 if (ret < 0) 1732 goto error_op; 1733 1734 afs_op_set_vnode(op, 0, dvnode); 1735 afs_op_set_vnode(op, 1, vnode); 1736 op->file[0].dv_delta = 1; 1737 op->file[0].modification = true; 1738 op->file[0].update_ctime = true; 1739 op->file[1].update_ctime = true; 1740 1741 op->dentry = dentry; 1742 op->dentry_2 = from; 1743 op->ops = &afs_link_operation; 1744 op->create.reason = afs_edit_dir_for_link; 1745 return afs_do_sync_operation(op); 1746 1747 error_op: 1748 afs_put_operation(op); 1749 error: 1750 d_drop(dentry); 1751 _leave(" = %d", ret); 1752 return ret; 1753 } 1754 1755 static const struct afs_operation_ops afs_symlink_operation = { 1756 .issue_afs_rpc = afs_fs_symlink, 1757 .issue_yfs_rpc = yfs_fs_symlink, 1758 .success = afs_create_success, 1759 .aborted = afs_check_for_remote_deletion, 1760 .edit_dir = afs_create_edit_dir, 1761 .put = afs_create_put, 1762 }; 1763 1764 /* 1765 * create a symlink in an AFS filesystem 1766 */ 1767 static int afs_symlink(struct mnt_idmap *idmap, struct inode *dir, 1768 struct dentry *dentry, const char *content) 1769 { 1770 struct afs_operation *op; 1771 struct afs_vnode *dvnode = AFS_FS_I(dir); 1772 int ret; 1773 1774 _enter("{%llx:%llu},{%pd},%s", 1775 dvnode->fid.vid, dvnode->fid.vnode, dentry, 1776 content); 1777 1778 ret = -ENAMETOOLONG; 1779 if (dentry->d_name.len >= AFSNAMEMAX) 1780 goto error; 1781 1782 ret = -EINVAL; 1783 if (strlen(content) >= AFSPATHMAX) 1784 goto error; 1785 1786 op = afs_alloc_operation(NULL, dvnode->volume); 1787 if (IS_ERR(op)) { 1788 ret = PTR_ERR(op); 1789 goto error; 1790 } 1791 1792 afs_op_set_vnode(op, 0, dvnode); 1793 op->file[0].dv_delta = 1; 1794 1795 op->dentry = dentry; 1796 op->ops = &afs_symlink_operation; 1797 op->create.reason = afs_edit_dir_for_symlink; 1798 op->create.symlink = content; 1799 return afs_do_sync_operation(op); 1800 1801 error: 1802 d_drop(dentry); 1803 _leave(" = %d", ret); 1804 return ret; 1805 } 1806 1807 static void afs_rename_success(struct afs_operation *op) 1808 { 1809 _enter("op=%08x", op->debug_id); 1810 1811 op->ctime = op->file[0].scb.status.mtime_client; 1812 afs_check_dir_conflict(op, &op->file[1]); 1813 afs_vnode_commit_status(op, &op->file[0]); 1814 if (op->file[1].vnode != op->file[0].vnode) { 1815 op->ctime = op->file[1].scb.status.mtime_client; 1816 afs_vnode_commit_status(op, &op->file[1]); 1817 } 1818 } 1819 1820 static void afs_rename_edit_dir(struct afs_operation *op) 1821 { 1822 struct afs_vnode_param *orig_dvp = &op->file[0]; 1823 struct afs_vnode_param *new_dvp = &op->file[1]; 1824 struct afs_vnode *orig_dvnode = orig_dvp->vnode; 1825 struct afs_vnode *new_dvnode = new_dvp->vnode; 1826 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); 1827 struct dentry *old_dentry = op->dentry; 1828 struct dentry *new_dentry = op->dentry_2; 1829 struct inode *new_inode; 1830 1831 _enter("op=%08x", op->debug_id); 1832 1833 if (op->rename.rehash) { 1834 d_rehash(op->rename.rehash); 1835 op->rename.rehash = NULL; 1836 } 1837 1838 down_write(&orig_dvnode->validate_lock); 1839 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && 1840 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) 1841 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 1842 afs_edit_dir_for_rename_0); 1843 1844 if (new_dvnode != orig_dvnode) { 1845 up_write(&orig_dvnode->validate_lock); 1846 down_write(&new_dvnode->validate_lock); 1847 } 1848 1849 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && 1850 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { 1851 if (!op->rename.new_negative) 1852 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 1853 afs_edit_dir_for_rename_1); 1854 1855 afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 1856 &vnode->fid, afs_edit_dir_for_rename_2); 1857 } 1858 1859 new_inode = d_inode(new_dentry); 1860 if (new_inode) { 1861 spin_lock(&new_inode->i_lock); 1862 if (S_ISDIR(new_inode->i_mode)) 1863 clear_nlink(new_inode); 1864 else if (new_inode->i_nlink > 0) 1865 drop_nlink(new_inode); 1866 spin_unlock(&new_inode->i_lock); 1867 } 1868 1869 /* Now we can update d_fsdata on the dentries to reflect their 1870 * new parent's data_version. 1871 * 1872 * Note that if we ever implement RENAME_EXCHANGE, we'll have 1873 * to update both dentries with opposing dir versions. 1874 */ 1875 afs_update_dentry_version(op, new_dvp, op->dentry); 1876 afs_update_dentry_version(op, new_dvp, op->dentry_2); 1877 1878 d_move(old_dentry, new_dentry); 1879 1880 up_write(&new_dvnode->validate_lock); 1881 } 1882 1883 static void afs_rename_put(struct afs_operation *op) 1884 { 1885 _enter("op=%08x", op->debug_id); 1886 if (op->rename.rehash) 1887 d_rehash(op->rename.rehash); 1888 dput(op->rename.tmp); 1889 if (op->error) 1890 d_rehash(op->dentry); 1891 } 1892 1893 static const struct afs_operation_ops afs_rename_operation = { 1894 .issue_afs_rpc = afs_fs_rename, 1895 .issue_yfs_rpc = yfs_fs_rename, 1896 .success = afs_rename_success, 1897 .edit_dir = afs_rename_edit_dir, 1898 .put = afs_rename_put, 1899 }; 1900 1901 /* 1902 * rename a file in an AFS filesystem and/or move it between directories 1903 */ 1904 static int afs_rename(struct mnt_idmap *idmap, struct inode *old_dir, 1905 struct dentry *old_dentry, struct inode *new_dir, 1906 struct dentry *new_dentry, unsigned int flags) 1907 { 1908 struct afs_operation *op; 1909 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1910 int ret; 1911 1912 if (flags) 1913 return -EINVAL; 1914 1915 /* Don't allow silly-rename files be moved around. */ 1916 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 1917 return -EINVAL; 1918 1919 vnode = AFS_FS_I(d_inode(old_dentry)); 1920 orig_dvnode = AFS_FS_I(old_dir); 1921 new_dvnode = AFS_FS_I(new_dir); 1922 1923 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1924 orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1925 vnode->fid.vid, vnode->fid.vnode, 1926 new_dvnode->fid.vid, new_dvnode->fid.vnode, 1927 new_dentry); 1928 1929 op = afs_alloc_operation(NULL, orig_dvnode->volume); 1930 if (IS_ERR(op)) 1931 return PTR_ERR(op); 1932 1933 ret = afs_validate(vnode, op->key); 1934 op->error = ret; 1935 if (ret < 0) 1936 goto error; 1937 1938 afs_op_set_vnode(op, 0, orig_dvnode); 1939 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ 1940 op->file[0].dv_delta = 1; 1941 op->file[1].dv_delta = 1; 1942 op->file[0].modification = true; 1943 op->file[1].modification = true; 1944 op->file[0].update_ctime = true; 1945 op->file[1].update_ctime = true; 1946 1947 op->dentry = old_dentry; 1948 op->dentry_2 = new_dentry; 1949 op->rename.new_negative = d_is_negative(new_dentry); 1950 op->ops = &afs_rename_operation; 1951 1952 /* For non-directories, check whether the target is busy and if so, 1953 * make a copy of the dentry and then do a silly-rename. If the 1954 * silly-rename succeeds, the copied dentry is hashed and becomes the 1955 * new target. 1956 */ 1957 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 1958 /* To prevent any new references to the target during the 1959 * rename, we unhash the dentry in advance. 1960 */ 1961 if (!d_unhashed(new_dentry)) { 1962 d_drop(new_dentry); 1963 op->rename.rehash = new_dentry; 1964 } 1965 1966 if (d_count(new_dentry) > 2) { 1967 /* copy the target dentry's name */ 1968 op->rename.tmp = d_alloc(new_dentry->d_parent, 1969 &new_dentry->d_name); 1970 if (!op->rename.tmp) { 1971 op->error = -ENOMEM; 1972 goto error; 1973 } 1974 1975 ret = afs_sillyrename(new_dvnode, 1976 AFS_FS_I(d_inode(new_dentry)), 1977 new_dentry, op->key); 1978 if (ret) { 1979 op->error = ret; 1980 goto error; 1981 } 1982 1983 op->dentry_2 = op->rename.tmp; 1984 op->rename.rehash = NULL; 1985 op->rename.new_negative = true; 1986 } 1987 } 1988 1989 /* This bit is potentially nasty as there's a potential race with 1990 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 1991 * to reflect it's new parent's new data_version after the op, but 1992 * d_revalidate may see old_dentry between the op having taken place 1993 * and the version being updated. 1994 * 1995 * So drop the old_dentry for now to make other threads go through 1996 * lookup instead - which we hold a lock against. 1997 */ 1998 d_drop(old_dentry); 1999 2000 return afs_do_sync_operation(op); 2001 2002 error: 2003 return afs_put_operation(op); 2004 } 2005 2006 /* 2007 * Release a directory folio and clean up its private state if it's not busy 2008 * - return true if the folio can now be released, false if not 2009 */ 2010 static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags) 2011 { 2012 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); 2013 2014 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio)); 2015 2016 folio_detach_private(folio); 2017 2018 /* The directory will need reloading. */ 2019 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2020 afs_stat_v(dvnode, n_relpg); 2021 return true; 2022 } 2023 2024 /* 2025 * Invalidate part or all of a folio. 2026 */ 2027 static void afs_dir_invalidate_folio(struct folio *folio, size_t offset, 2028 size_t length) 2029 { 2030 struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio)); 2031 2032 _enter("{%lu},%zu,%zu", folio->index, offset, length); 2033 2034 BUG_ON(!folio_test_locked(folio)); 2035 2036 /* The directory will need reloading. */ 2037 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2038 afs_stat_v(dvnode, n_inval); 2039 2040 /* we clean up only if the entire folio is being invalidated */ 2041 if (offset == 0 && length == folio_size(folio)) 2042 folio_detach_private(folio); 2043 } 2044