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 int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen, 28 loff_t fpos, u64 ino, unsigned dtype); 29 static int 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 user_namespace *mnt_userns, struct inode *dir, 32 struct dentry *dentry, umode_t mode, bool excl); 33 static int afs_mkdir(struct user_namespace *mnt_userns, 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 user_namespace *mnt_userns, struct inode *dir, 40 struct dentry *dentry, const char *content); 41 static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 42 struct dentry *old_dentry, struct inode *new_dir, 43 struct dentry *new_dentry, unsigned int flags); 44 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags); 45 static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 46 unsigned int length); 47 48 static int afs_dir_set_page_dirty(struct page *page) 49 { 50 BUG(); /* This should never happen. */ 51 } 52 53 const struct file_operations afs_dir_file_operations = { 54 .open = afs_dir_open, 55 .release = afs_release, 56 .iterate_shared = afs_readdir, 57 .lock = afs_lock, 58 .llseek = generic_file_llseek, 59 }; 60 61 const struct inode_operations afs_dir_inode_operations = { 62 .create = afs_create, 63 .lookup = afs_lookup, 64 .link = afs_link, 65 .unlink = afs_unlink, 66 .symlink = afs_symlink, 67 .mkdir = afs_mkdir, 68 .rmdir = afs_rmdir, 69 .rename = afs_rename, 70 .permission = afs_permission, 71 .getattr = afs_getattr, 72 .setattr = afs_setattr, 73 }; 74 75 const struct address_space_operations afs_dir_aops = { 76 .set_page_dirty = afs_dir_set_page_dirty, 77 .releasepage = afs_dir_releasepage, 78 .invalidatepage = afs_dir_invalidatepage, 79 }; 80 81 const struct dentry_operations afs_fs_dentry_operations = { 82 .d_revalidate = afs_d_revalidate, 83 .d_delete = afs_d_delete, 84 .d_release = afs_d_release, 85 .d_automount = afs_d_automount, 86 .d_iput = afs_d_iput, 87 }; 88 89 struct afs_lookup_one_cookie { 90 struct dir_context ctx; 91 struct qstr name; 92 bool found; 93 struct afs_fid fid; 94 }; 95 96 struct afs_lookup_cookie { 97 struct dir_context ctx; 98 struct qstr name; 99 bool found; 100 bool one_only; 101 unsigned short nr_fids; 102 struct afs_fid fids[50]; 103 }; 104 105 /* 106 * Drop the refs that we're holding on the pages we were reading into. We've 107 * got refs on the first nr_pages pages. 108 */ 109 static void afs_dir_read_cleanup(struct afs_read *req) 110 { 111 struct address_space *mapping = req->vnode->vfs_inode.i_mapping; 112 struct page *page; 113 pgoff_t last = req->nr_pages - 1; 114 115 XA_STATE(xas, &mapping->i_pages, 0); 116 117 if (unlikely(!req->nr_pages)) 118 return; 119 120 rcu_read_lock(); 121 xas_for_each(&xas, page, last) { 122 if (xas_retry(&xas, page)) 123 continue; 124 BUG_ON(xa_is_value(page)); 125 BUG_ON(PageCompound(page)); 126 ASSERTCMP(page->mapping, ==, mapping); 127 128 put_page(page); 129 } 130 131 rcu_read_unlock(); 132 } 133 134 /* 135 * check that a directory page is valid 136 */ 137 static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page, 138 loff_t i_size) 139 { 140 struct afs_xdr_dir_page *dbuf; 141 loff_t latter, off; 142 int tmp, qty; 143 144 /* Determine how many magic numbers there should be in this page, but 145 * we must take care because the directory may change size under us. 146 */ 147 off = page_offset(page); 148 if (i_size <= off) 149 goto checked; 150 151 latter = i_size - off; 152 if (latter >= PAGE_SIZE) 153 qty = PAGE_SIZE; 154 else 155 qty = latter; 156 qty /= sizeof(union afs_xdr_dir_block); 157 158 /* check them */ 159 dbuf = kmap_atomic(page); 160 for (tmp = 0; tmp < qty; tmp++) { 161 if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) { 162 printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n", 163 __func__, dvnode->vfs_inode.i_ino, tmp, qty, 164 ntohs(dbuf->blocks[tmp].hdr.magic)); 165 trace_afs_dir_check_failed(dvnode, off, i_size); 166 kunmap(page); 167 trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic); 168 goto error; 169 } 170 171 /* Make sure each block is NUL terminated so we can reasonably 172 * use string functions on it. The filenames in the page 173 * *should* be NUL-terminated anyway. 174 */ 175 ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0; 176 } 177 178 kunmap_atomic(dbuf); 179 180 checked: 181 afs_stat_v(dvnode, n_read_dir); 182 return true; 183 184 error: 185 return false; 186 } 187 188 /* 189 * Dump the contents of a directory. 190 */ 191 static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req) 192 { 193 struct afs_xdr_dir_page *dbuf; 194 struct address_space *mapping = dvnode->vfs_inode.i_mapping; 195 struct page *page; 196 unsigned int i, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block); 197 pgoff_t last = req->nr_pages - 1; 198 199 XA_STATE(xas, &mapping->i_pages, 0); 200 201 pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n", 202 dvnode->fid.vid, dvnode->fid.vnode, 203 req->file_size, req->len, req->actual_len); 204 pr_warn("DIR %llx %x %zx %zx\n", 205 req->pos, req->nr_pages, 206 req->iter->iov_offset, iov_iter_count(req->iter)); 207 208 xas_for_each(&xas, page, last) { 209 if (xas_retry(&xas, page)) 210 continue; 211 212 BUG_ON(PageCompound(page)); 213 BUG_ON(page->mapping != mapping); 214 215 dbuf = kmap_atomic(page); 216 for (i = 0; i < qty; i++) { 217 union afs_xdr_dir_block *block = &dbuf->blocks[i]; 218 219 pr_warn("[%02lx] %32phN\n", page->index * qty + i, block); 220 } 221 kunmap_atomic(dbuf); 222 } 223 } 224 225 /* 226 * Check all the pages in a directory. All the pages are held pinned. 227 */ 228 static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req) 229 { 230 struct address_space *mapping = dvnode->vfs_inode.i_mapping; 231 struct page *page; 232 pgoff_t last = req->nr_pages - 1; 233 int ret = 0; 234 235 XA_STATE(xas, &mapping->i_pages, 0); 236 237 if (unlikely(!req->nr_pages)) 238 return 0; 239 240 rcu_read_lock(); 241 xas_for_each(&xas, page, last) { 242 if (xas_retry(&xas, page)) 243 continue; 244 245 BUG_ON(PageCompound(page)); 246 BUG_ON(page->mapping != mapping); 247 248 if (!afs_dir_check_page(dvnode, page, req->file_size)) { 249 afs_dir_dump(dvnode, req); 250 ret = -EIO; 251 break; 252 } 253 } 254 255 rcu_read_unlock(); 256 return ret; 257 } 258 259 /* 260 * open an AFS directory file 261 */ 262 static int afs_dir_open(struct inode *inode, struct file *file) 263 { 264 _enter("{%lu}", inode->i_ino); 265 266 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 267 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 268 269 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 270 return -ENOENT; 271 272 return afs_open(inode, file); 273 } 274 275 /* 276 * Read the directory into the pagecache in one go, scrubbing the previous 277 * contents. The list of pages is returned, pinning them so that they don't 278 * get reclaimed during the iteration. 279 */ 280 static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key) 281 __acquires(&dvnode->validate_lock) 282 { 283 struct afs_read *req; 284 loff_t i_size; 285 int nr_pages, i, n; 286 int ret; 287 288 _enter(""); 289 290 req = kzalloc(sizeof(*req), GFP_KERNEL); 291 if (!req) 292 return ERR_PTR(-ENOMEM); 293 294 refcount_set(&req->usage, 1); 295 req->vnode = dvnode; 296 req->key = key_get(key); 297 req->cleanup = afs_dir_read_cleanup; 298 299 expand: 300 i_size = i_size_read(&dvnode->vfs_inode); 301 if (i_size < 2048) { 302 ret = afs_bad(dvnode, afs_file_error_dir_small); 303 goto error; 304 } 305 if (i_size > 2048 * 1024) { 306 trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big); 307 ret = -EFBIG; 308 goto error; 309 } 310 311 _enter("%llu", i_size); 312 313 nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE; 314 315 req->actual_len = i_size; /* May change */ 316 req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */ 317 req->data_version = dvnode->status.data_version; /* May change */ 318 iov_iter_xarray(&req->def_iter, READ, &dvnode->vfs_inode.i_mapping->i_pages, 319 0, i_size); 320 req->iter = &req->def_iter; 321 322 /* Fill in any gaps that we might find where the memory reclaimer has 323 * been at work and pin all the pages. If there are any gaps, we will 324 * need to reread the entire directory contents. 325 */ 326 i = req->nr_pages; 327 while (i < nr_pages) { 328 struct page *pages[8], *page; 329 330 n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i, 331 min_t(unsigned int, nr_pages - i, 332 ARRAY_SIZE(pages)), 333 pages); 334 _debug("find %u at %u/%u", n, i, nr_pages); 335 336 if (n == 0) { 337 gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask; 338 339 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 340 afs_stat_v(dvnode, n_inval); 341 342 ret = -ENOMEM; 343 page = __page_cache_alloc(gfp); 344 if (!page) 345 goto error; 346 ret = add_to_page_cache_lru(page, 347 dvnode->vfs_inode.i_mapping, 348 i, gfp); 349 if (ret < 0) 350 goto error; 351 352 attach_page_private(page, (void *)1); 353 unlock_page(page); 354 req->nr_pages++; 355 i++; 356 } else { 357 req->nr_pages += n; 358 i += n; 359 } 360 } 361 362 /* If we're going to reload, we need to lock all the pages to prevent 363 * races. 364 */ 365 ret = -ERESTARTSYS; 366 if (down_read_killable(&dvnode->validate_lock) < 0) 367 goto error; 368 369 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 370 goto success; 371 372 up_read(&dvnode->validate_lock); 373 if (down_write_killable(&dvnode->validate_lock) < 0) 374 goto error; 375 376 if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 377 trace_afs_reload_dir(dvnode); 378 ret = afs_fetch_data(dvnode, req); 379 if (ret < 0) 380 goto error_unlock; 381 382 task_io_account_read(PAGE_SIZE * req->nr_pages); 383 384 if (req->len < req->file_size) { 385 /* The content has grown, so we need to expand the 386 * buffer. 387 */ 388 up_write(&dvnode->validate_lock); 389 goto expand; 390 } 391 392 /* Validate the data we just read. */ 393 ret = afs_dir_check(dvnode, req); 394 if (ret < 0) 395 goto error_unlock; 396 397 // TODO: Trim excess pages 398 399 set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags); 400 } 401 402 downgrade_write(&dvnode->validate_lock); 403 success: 404 return req; 405 406 error_unlock: 407 up_write(&dvnode->validate_lock); 408 error: 409 afs_put_read(req); 410 _leave(" = %d", ret); 411 return ERR_PTR(ret); 412 } 413 414 /* 415 * deal with one block in an AFS directory 416 */ 417 static int afs_dir_iterate_block(struct afs_vnode *dvnode, 418 struct dir_context *ctx, 419 union afs_xdr_dir_block *block, 420 unsigned blkoff) 421 { 422 union afs_xdr_dirent *dire; 423 unsigned offset, next, curr, nr_slots; 424 size_t nlen; 425 int tmp; 426 427 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 428 429 curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent); 430 431 /* walk through the block, an entry at a time */ 432 for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS); 433 offset < AFS_DIR_SLOTS_PER_BLOCK; 434 offset = next 435 ) { 436 /* skip entries marked unused in the bitmap */ 437 if (!(block->hdr.bitmap[offset / 8] & 438 (1 << (offset % 8)))) { 439 _debug("ENT[%zu.%u]: unused", 440 blkoff / sizeof(union afs_xdr_dir_block), offset); 441 next = offset + 1; 442 if (offset >= curr) 443 ctx->pos = blkoff + 444 next * sizeof(union afs_xdr_dirent); 445 continue; 446 } 447 448 /* got a valid entry */ 449 dire = &block->dirents[offset]; 450 nlen = strnlen(dire->u.name, 451 sizeof(*block) - 452 offset * sizeof(union afs_xdr_dirent)); 453 if (nlen > AFSNAMEMAX - 1) { 454 _debug("ENT[%zu]: name too long (len %u/%zu)", 455 blkoff / sizeof(union afs_xdr_dir_block), 456 offset, nlen); 457 return afs_bad(dvnode, afs_file_error_dir_name_too_long); 458 } 459 460 _debug("ENT[%zu.%u]: %s %zu \"%s\"", 461 blkoff / sizeof(union afs_xdr_dir_block), offset, 462 (offset < curr ? "skip" : "fill"), 463 nlen, dire->u.name); 464 465 nr_slots = afs_dir_calc_slots(nlen); 466 next = offset + nr_slots; 467 if (next > AFS_DIR_SLOTS_PER_BLOCK) { 468 _debug("ENT[%zu.%u]:" 469 " %u extends beyond end dir block" 470 " (len %zu)", 471 blkoff / sizeof(union afs_xdr_dir_block), 472 offset, next, nlen); 473 return afs_bad(dvnode, afs_file_error_dir_over_end); 474 } 475 476 /* Check that the name-extension dirents are all allocated */ 477 for (tmp = 1; tmp < nr_slots; tmp++) { 478 unsigned int ix = offset + tmp; 479 if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) { 480 _debug("ENT[%zu.u]:" 481 " %u unmarked extension (%u/%u)", 482 blkoff / sizeof(union afs_xdr_dir_block), 483 offset, tmp, nr_slots); 484 return afs_bad(dvnode, afs_file_error_dir_unmarked_ext); 485 } 486 } 487 488 /* skip if starts before the current position */ 489 if (offset < curr) { 490 if (next > curr) 491 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 492 continue; 493 } 494 495 /* found the next entry */ 496 if (!dir_emit(ctx, dire->u.name, nlen, 497 ntohl(dire->u.vnode), 498 (ctx->actor == afs_lookup_filldir || 499 ctx->actor == afs_lookup_one_filldir)? 500 ntohl(dire->u.unique) : DT_UNKNOWN)) { 501 _leave(" = 0 [full]"); 502 return 0; 503 } 504 505 ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent); 506 } 507 508 _leave(" = 1 [more]"); 509 return 1; 510 } 511 512 /* 513 * iterate through the data blob that lists the contents of an AFS directory 514 */ 515 static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 516 struct key *key, afs_dataversion_t *_dir_version) 517 { 518 struct afs_vnode *dvnode = AFS_FS_I(dir); 519 struct afs_xdr_dir_page *dbuf; 520 union afs_xdr_dir_block *dblock; 521 struct afs_read *req; 522 struct page *page; 523 unsigned blkoff, limit; 524 void __rcu **slot; 525 int ret; 526 527 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 528 529 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 530 _leave(" = -ESTALE"); 531 return -ESTALE; 532 } 533 534 req = afs_read_dir(dvnode, key); 535 if (IS_ERR(req)) 536 return PTR_ERR(req); 537 *_dir_version = req->data_version; 538 539 /* round the file position up to the next entry boundary */ 540 ctx->pos += sizeof(union afs_xdr_dirent) - 1; 541 ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1); 542 543 /* walk through the blocks in sequence */ 544 ret = 0; 545 while (ctx->pos < req->actual_len) { 546 blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1); 547 548 /* Fetch the appropriate page from the directory and re-add it 549 * to the LRU. We have all the pages pinned with an extra ref. 550 */ 551 rcu_read_lock(); 552 page = NULL; 553 slot = radix_tree_lookup_slot(&dvnode->vfs_inode.i_mapping->i_pages, 554 blkoff / PAGE_SIZE); 555 if (slot) 556 page = radix_tree_deref_slot(slot); 557 rcu_read_unlock(); 558 if (!page) { 559 ret = afs_bad(dvnode, afs_file_error_dir_missing_page); 560 break; 561 } 562 mark_page_accessed(page); 563 564 limit = blkoff & ~(PAGE_SIZE - 1); 565 566 dbuf = kmap(page); 567 568 /* deal with the individual blocks stashed on this page */ 569 do { 570 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 571 sizeof(union afs_xdr_dir_block)]; 572 ret = afs_dir_iterate_block(dvnode, ctx, dblock, blkoff); 573 if (ret != 1) { 574 kunmap(page); 575 goto out; 576 } 577 578 blkoff += sizeof(union afs_xdr_dir_block); 579 580 } while (ctx->pos < dir->i_size && blkoff < limit); 581 582 kunmap(page); 583 ret = 0; 584 } 585 586 out: 587 up_read(&dvnode->validate_lock); 588 afs_put_read(req); 589 _leave(" = %d", ret); 590 return ret; 591 } 592 593 /* 594 * read an AFS directory 595 */ 596 static int afs_readdir(struct file *file, struct dir_context *ctx) 597 { 598 afs_dataversion_t dir_version; 599 600 return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file), 601 &dir_version); 602 } 603 604 /* 605 * Search the directory for a single name 606 * - if afs_dir_iterate_block() spots this function, it'll pass the FID 607 * uniquifier through dtype 608 */ 609 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, 610 int nlen, loff_t fpos, u64 ino, unsigned dtype) 611 { 612 struct afs_lookup_one_cookie *cookie = 613 container_of(ctx, struct afs_lookup_one_cookie, ctx); 614 615 _enter("{%s,%u},%s,%u,,%llu,%u", 616 cookie->name.name, cookie->name.len, name, nlen, 617 (unsigned long long) ino, dtype); 618 619 /* insanity checks first */ 620 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 621 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 622 623 if (cookie->name.len != nlen || 624 memcmp(cookie->name.name, name, nlen) != 0) { 625 _leave(" = 0 [no]"); 626 return 0; 627 } 628 629 cookie->fid.vnode = ino; 630 cookie->fid.unique = dtype; 631 cookie->found = 1; 632 633 _leave(" = -1 [found]"); 634 return -1; 635 } 636 637 /* 638 * Do a lookup of a single name in a directory 639 * - just returns the FID the dentry name maps to if found 640 */ 641 static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry, 642 struct afs_fid *fid, struct key *key, 643 afs_dataversion_t *_dir_version) 644 { 645 struct afs_super_info *as = dir->i_sb->s_fs_info; 646 struct afs_lookup_one_cookie cookie = { 647 .ctx.actor = afs_lookup_one_filldir, 648 .name = dentry->d_name, 649 .fid.vid = as->volume->vid 650 }; 651 int ret; 652 653 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 654 655 /* search the directory */ 656 ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version); 657 if (ret < 0) { 658 _leave(" = %d [iter]", ret); 659 return ret; 660 } 661 662 if (!cookie.found) { 663 _leave(" = -ENOENT [not found]"); 664 return -ENOENT; 665 } 666 667 *fid = cookie.fid; 668 _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique); 669 return 0; 670 } 671 672 /* 673 * search the directory for a name 674 * - if afs_dir_iterate_block() spots this function, it'll pass the FID 675 * uniquifier through dtype 676 */ 677 static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 678 int nlen, loff_t fpos, u64 ino, unsigned dtype) 679 { 680 struct afs_lookup_cookie *cookie = 681 container_of(ctx, struct afs_lookup_cookie, ctx); 682 int ret; 683 684 _enter("{%s,%u},%s,%u,,%llu,%u", 685 cookie->name.name, cookie->name.len, name, nlen, 686 (unsigned long long) ino, dtype); 687 688 /* insanity checks first */ 689 BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048); 690 BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32); 691 692 if (cookie->found) { 693 if (cookie->nr_fids < 50) { 694 cookie->fids[cookie->nr_fids].vnode = ino; 695 cookie->fids[cookie->nr_fids].unique = dtype; 696 cookie->nr_fids++; 697 } 698 } else if (cookie->name.len == nlen && 699 memcmp(cookie->name.name, name, nlen) == 0) { 700 cookie->fids[1].vnode = ino; 701 cookie->fids[1].unique = dtype; 702 cookie->found = 1; 703 if (cookie->one_only) 704 return -1; 705 } 706 707 ret = cookie->nr_fids >= 50 ? -1 : 0; 708 _leave(" = %d", ret); 709 return ret; 710 } 711 712 /* 713 * Deal with the result of a successful lookup operation. Turn all the files 714 * into inodes and save the first one - which is the one we actually want. 715 */ 716 static void afs_do_lookup_success(struct afs_operation *op) 717 { 718 struct afs_vnode_param *vp; 719 struct afs_vnode *vnode; 720 struct inode *inode; 721 u32 abort_code; 722 int i; 723 724 _enter(""); 725 726 for (i = 0; i < op->nr_files; i++) { 727 switch (i) { 728 case 0: 729 vp = &op->file[0]; 730 abort_code = vp->scb.status.abort_code; 731 if (abort_code != 0) { 732 op->ac.abort_code = abort_code; 733 op->error = afs_abort_to_error(abort_code); 734 } 735 break; 736 737 case 1: 738 vp = &op->file[1]; 739 break; 740 741 default: 742 vp = &op->more_files[i - 2]; 743 break; 744 } 745 746 if (!vp->scb.have_status && !vp->scb.have_error) 747 continue; 748 749 _debug("do [%u]", i); 750 if (vp->vnode) { 751 if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags)) 752 afs_vnode_commit_status(op, vp); 753 } else if (vp->scb.status.abort_code == 0) { 754 inode = afs_iget(op, vp); 755 if (!IS_ERR(inode)) { 756 vnode = AFS_FS_I(inode); 757 afs_cache_permit(vnode, op->key, 758 0 /* Assume vnode->cb_break is 0 */ + 759 op->cb_v_break, 760 &vp->scb); 761 vp->vnode = vnode; 762 vp->put_vnode = true; 763 } 764 } else { 765 _debug("- abort %d %llx:%llx.%x", 766 vp->scb.status.abort_code, 767 vp->fid.vid, vp->fid.vnode, vp->fid.unique); 768 } 769 } 770 771 _leave(""); 772 } 773 774 static const struct afs_operation_ops afs_inline_bulk_status_operation = { 775 .issue_afs_rpc = afs_fs_inline_bulk_status, 776 .issue_yfs_rpc = yfs_fs_inline_bulk_status, 777 .success = afs_do_lookup_success, 778 }; 779 780 static const struct afs_operation_ops afs_lookup_fetch_status_operation = { 781 .issue_afs_rpc = afs_fs_fetch_status, 782 .issue_yfs_rpc = yfs_fs_fetch_status, 783 .success = afs_do_lookup_success, 784 .aborted = afs_check_for_remote_deletion, 785 }; 786 787 /* 788 * See if we know that the server we expect to use doesn't support 789 * FS.InlineBulkStatus. 790 */ 791 static bool afs_server_supports_ibulk(struct afs_vnode *dvnode) 792 { 793 struct afs_server_list *slist; 794 struct afs_volume *volume = dvnode->volume; 795 struct afs_server *server; 796 bool ret = true; 797 int i; 798 799 if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags)) 800 return true; 801 802 rcu_read_lock(); 803 slist = rcu_dereference(volume->servers); 804 805 for (i = 0; i < slist->nr_servers; i++) { 806 server = slist->servers[i].server; 807 if (server == dvnode->cb_server) { 808 if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags)) 809 ret = false; 810 break; 811 } 812 } 813 814 rcu_read_unlock(); 815 return ret; 816 } 817 818 /* 819 * Do a lookup in a directory. We make use of bulk lookup to query a slew of 820 * files in one go and create inodes for them. The inode of the file we were 821 * asked for is returned. 822 */ 823 static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry, 824 struct key *key) 825 { 826 struct afs_lookup_cookie *cookie; 827 struct afs_vnode_param *vp; 828 struct afs_operation *op; 829 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode; 830 struct inode *inode = NULL, *ti; 831 afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version); 832 long ret; 833 int i; 834 835 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 836 837 cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL); 838 if (!cookie) 839 return ERR_PTR(-ENOMEM); 840 841 for (i = 0; i < ARRAY_SIZE(cookie->fids); i++) 842 cookie->fids[i].vid = dvnode->fid.vid; 843 cookie->ctx.actor = afs_lookup_filldir; 844 cookie->name = dentry->d_name; 845 cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want 846 * and slot 1 for the directory */ 847 848 if (!afs_server_supports_ibulk(dvnode)) 849 cookie->one_only = true; 850 851 /* search the directory */ 852 ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version); 853 if (ret < 0) 854 goto out; 855 856 dentry->d_fsdata = (void *)(unsigned long)data_version; 857 858 ret = -ENOENT; 859 if (!cookie->found) 860 goto out; 861 862 /* Check to see if we already have an inode for the primary fid. */ 863 inode = ilookup5(dir->i_sb, cookie->fids[1].vnode, 864 afs_ilookup5_test_by_fid, &cookie->fids[1]); 865 if (inode) 866 goto out; /* We do */ 867 868 /* Okay, we didn't find it. We need to query the server - and whilst 869 * we're doing that, we're going to attempt to look up a bunch of other 870 * vnodes also. 871 */ 872 op = afs_alloc_operation(NULL, dvnode->volume); 873 if (IS_ERR(op)) { 874 ret = PTR_ERR(op); 875 goto out; 876 } 877 878 afs_op_set_vnode(op, 0, dvnode); 879 afs_op_set_fid(op, 1, &cookie->fids[1]); 880 881 op->nr_files = cookie->nr_fids; 882 _debug("nr_files %u", op->nr_files); 883 884 /* Need space for examining all the selected files */ 885 op->error = -ENOMEM; 886 if (op->nr_files > 2) { 887 op->more_files = kvcalloc(op->nr_files - 2, 888 sizeof(struct afs_vnode_param), 889 GFP_KERNEL); 890 if (!op->more_files) 891 goto out_op; 892 893 for (i = 2; i < op->nr_files; i++) { 894 vp = &op->more_files[i - 2]; 895 vp->fid = cookie->fids[i]; 896 897 /* Find any inodes that already exist and get their 898 * callback counters. 899 */ 900 ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode, 901 afs_ilookup5_test_by_fid, &vp->fid); 902 if (!IS_ERR_OR_NULL(ti)) { 903 vnode = AFS_FS_I(ti); 904 vp->dv_before = vnode->status.data_version; 905 vp->cb_break_before = afs_calc_vnode_cb_break(vnode); 906 vp->vnode = vnode; 907 vp->put_vnode = true; 908 vp->speculative = true; /* vnode not locked */ 909 } 910 } 911 } 912 913 /* Try FS.InlineBulkStatus first. Abort codes for the individual 914 * lookups contained therein are stored in the reply without aborting 915 * the whole operation. 916 */ 917 op->error = -ENOTSUPP; 918 if (!cookie->one_only) { 919 op->ops = &afs_inline_bulk_status_operation; 920 afs_begin_vnode_operation(op); 921 afs_wait_for_operation(op); 922 } 923 924 if (op->error == -ENOTSUPP) { 925 /* We could try FS.BulkStatus next, but this aborts the entire 926 * op if any of the lookups fails - so, for the moment, revert 927 * to FS.FetchStatus for op->file[1]. 928 */ 929 op->fetch_status.which = 1; 930 op->ops = &afs_lookup_fetch_status_operation; 931 afs_begin_vnode_operation(op); 932 afs_wait_for_operation(op); 933 } 934 inode = ERR_PTR(op->error); 935 936 out_op: 937 if (op->error == 0) { 938 inode = &op->file[1].vnode->vfs_inode; 939 op->file[1].vnode = NULL; 940 } 941 942 if (op->file[0].scb.have_status) 943 dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version; 944 else 945 dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before; 946 ret = afs_put_operation(op); 947 out: 948 kfree(cookie); 949 _leave(""); 950 return inode ?: ERR_PTR(ret); 951 } 952 953 /* 954 * Look up an entry in a directory with @sys substitution. 955 */ 956 static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry, 957 struct key *key) 958 { 959 struct afs_sysnames *subs; 960 struct afs_net *net = afs_i2net(dir); 961 struct dentry *ret; 962 char *buf, *p, *name; 963 int len, i; 964 965 _enter(""); 966 967 ret = ERR_PTR(-ENOMEM); 968 p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL); 969 if (!buf) 970 goto out_p; 971 if (dentry->d_name.len > 4) { 972 memcpy(p, dentry->d_name.name, dentry->d_name.len - 4); 973 p += dentry->d_name.len - 4; 974 } 975 976 /* There is an ordered list of substitutes that we have to try. */ 977 read_lock(&net->sysnames_lock); 978 subs = net->sysnames; 979 refcount_inc(&subs->usage); 980 read_unlock(&net->sysnames_lock); 981 982 for (i = 0; i < subs->nr; i++) { 983 name = subs->subs[i]; 984 len = dentry->d_name.len - 4 + strlen(name); 985 if (len >= AFSNAMEMAX) { 986 ret = ERR_PTR(-ENAMETOOLONG); 987 goto out_s; 988 } 989 990 strcpy(p, name); 991 ret = lookup_one_len(buf, dentry->d_parent, len); 992 if (IS_ERR(ret) || d_is_positive(ret)) 993 goto out_s; 994 dput(ret); 995 } 996 997 /* We don't want to d_add() the @sys dentry here as we don't want to 998 * the cached dentry to hide changes to the sysnames list. 999 */ 1000 ret = NULL; 1001 out_s: 1002 afs_put_sysnames(subs); 1003 kfree(buf); 1004 out_p: 1005 key_put(key); 1006 return ret; 1007 } 1008 1009 /* 1010 * look up an entry in a directory 1011 */ 1012 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 1013 unsigned int flags) 1014 { 1015 struct afs_vnode *dvnode = AFS_FS_I(dir); 1016 struct afs_fid fid = {}; 1017 struct inode *inode; 1018 struct dentry *d; 1019 struct key *key; 1020 int ret; 1021 1022 _enter("{%llx:%llu},%p{%pd},", 1023 dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry); 1024 1025 ASSERTCMP(d_inode(dentry), ==, NULL); 1026 1027 if (dentry->d_name.len >= AFSNAMEMAX) { 1028 _leave(" = -ENAMETOOLONG"); 1029 return ERR_PTR(-ENAMETOOLONG); 1030 } 1031 1032 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) { 1033 _leave(" = -ESTALE"); 1034 return ERR_PTR(-ESTALE); 1035 } 1036 1037 key = afs_request_key(dvnode->volume->cell); 1038 if (IS_ERR(key)) { 1039 _leave(" = %ld [key]", PTR_ERR(key)); 1040 return ERR_CAST(key); 1041 } 1042 1043 ret = afs_validate(dvnode, key); 1044 if (ret < 0) { 1045 key_put(key); 1046 _leave(" = %d [val]", ret); 1047 return ERR_PTR(ret); 1048 } 1049 1050 if (dentry->d_name.len >= 4 && 1051 dentry->d_name.name[dentry->d_name.len - 4] == '@' && 1052 dentry->d_name.name[dentry->d_name.len - 3] == 's' && 1053 dentry->d_name.name[dentry->d_name.len - 2] == 'y' && 1054 dentry->d_name.name[dentry->d_name.len - 1] == 's') 1055 return afs_lookup_atsys(dir, dentry, key); 1056 1057 afs_stat_v(dvnode, n_lookup); 1058 inode = afs_do_lookup(dir, dentry, key); 1059 key_put(key); 1060 if (inode == ERR_PTR(-ENOENT)) 1061 inode = afs_try_auto_mntpt(dentry, dir); 1062 1063 if (!IS_ERR_OR_NULL(inode)) 1064 fid = AFS_FS_I(inode)->fid; 1065 1066 _debug("splice %p", dentry->d_inode); 1067 d = d_splice_alias(inode, dentry); 1068 if (!IS_ERR_OR_NULL(d)) { 1069 d->d_fsdata = dentry->d_fsdata; 1070 trace_afs_lookup(dvnode, &d->d_name, &fid); 1071 } else { 1072 trace_afs_lookup(dvnode, &dentry->d_name, &fid); 1073 } 1074 _leave(""); 1075 return d; 1076 } 1077 1078 /* 1079 * Check the validity of a dentry under RCU conditions. 1080 */ 1081 static int afs_d_revalidate_rcu(struct dentry *dentry) 1082 { 1083 struct afs_vnode *dvnode; 1084 struct dentry *parent; 1085 struct inode *dir; 1086 long dir_version, de_version; 1087 1088 _enter("%p", dentry); 1089 1090 /* Check the parent directory is still valid first. */ 1091 parent = READ_ONCE(dentry->d_parent); 1092 dir = d_inode_rcu(parent); 1093 if (!dir) 1094 return -ECHILD; 1095 dvnode = AFS_FS_I(dir); 1096 if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) 1097 return -ECHILD; 1098 1099 if (!afs_check_validity(dvnode)) 1100 return -ECHILD; 1101 1102 /* We only need to invalidate a dentry if the server's copy changed 1103 * behind our back. If we made the change, it's no problem. Note that 1104 * on a 32-bit system, we only have 32 bits in the dentry to store the 1105 * version. 1106 */ 1107 dir_version = (long)READ_ONCE(dvnode->status.data_version); 1108 de_version = (long)READ_ONCE(dentry->d_fsdata); 1109 if (de_version != dir_version) { 1110 dir_version = (long)READ_ONCE(dvnode->invalid_before); 1111 if (de_version - dir_version < 0) 1112 return -ECHILD; 1113 } 1114 1115 return 1; /* Still valid */ 1116 } 1117 1118 /* 1119 * check that a dentry lookup hit has found a valid entry 1120 * - NOTE! the hit can be a negative hit too, so we can't assume we have an 1121 * inode 1122 */ 1123 static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 1124 { 1125 struct afs_vnode *vnode, *dir; 1126 struct afs_fid fid; 1127 struct dentry *parent; 1128 struct inode *inode; 1129 struct key *key; 1130 afs_dataversion_t dir_version, invalid_before; 1131 long de_version; 1132 int ret; 1133 1134 if (flags & LOOKUP_RCU) 1135 return afs_d_revalidate_rcu(dentry); 1136 1137 if (d_really_is_positive(dentry)) { 1138 vnode = AFS_FS_I(d_inode(dentry)); 1139 _enter("{v={%llx:%llu} n=%pd fl=%lx},", 1140 vnode->fid.vid, vnode->fid.vnode, dentry, 1141 vnode->flags); 1142 } else { 1143 _enter("{neg n=%pd}", dentry); 1144 } 1145 1146 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 1147 if (IS_ERR(key)) 1148 key = NULL; 1149 1150 /* Hold the parent dentry so we can peer at it */ 1151 parent = dget_parent(dentry); 1152 dir = AFS_FS_I(d_inode(parent)); 1153 1154 /* validate the parent directory */ 1155 afs_validate(dir, key); 1156 1157 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 1158 _debug("%pd: parent dir deleted", dentry); 1159 goto not_found; 1160 } 1161 1162 /* We only need to invalidate a dentry if the server's copy changed 1163 * behind our back. If we made the change, it's no problem. Note that 1164 * on a 32-bit system, we only have 32 bits in the dentry to store the 1165 * version. 1166 */ 1167 dir_version = dir->status.data_version; 1168 de_version = (long)dentry->d_fsdata; 1169 if (de_version == (long)dir_version) 1170 goto out_valid_noupdate; 1171 1172 invalid_before = dir->invalid_before; 1173 if (de_version - (long)invalid_before >= 0) 1174 goto out_valid; 1175 1176 _debug("dir modified"); 1177 afs_stat_v(dir, n_reval); 1178 1179 /* search the directory for this vnode */ 1180 ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key, &dir_version); 1181 switch (ret) { 1182 case 0: 1183 /* the filename maps to something */ 1184 if (d_really_is_negative(dentry)) 1185 goto not_found; 1186 inode = d_inode(dentry); 1187 if (is_bad_inode(inode)) { 1188 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 1189 dentry); 1190 goto not_found; 1191 } 1192 1193 vnode = AFS_FS_I(inode); 1194 1195 /* if the vnode ID has changed, then the dirent points to a 1196 * different file */ 1197 if (fid.vnode != vnode->fid.vnode) { 1198 _debug("%pd: dirent changed [%llu != %llu]", 1199 dentry, fid.vnode, 1200 vnode->fid.vnode); 1201 goto not_found; 1202 } 1203 1204 /* if the vnode ID uniqifier has changed, then the file has 1205 * been deleted and replaced, and the original vnode ID has 1206 * been reused */ 1207 if (fid.unique != vnode->fid.unique) { 1208 _debug("%pd: file deleted (uq %u -> %u I:%u)", 1209 dentry, fid.unique, 1210 vnode->fid.unique, 1211 vnode->vfs_inode.i_generation); 1212 goto not_found; 1213 } 1214 goto out_valid; 1215 1216 case -ENOENT: 1217 /* the filename is unknown */ 1218 _debug("%pd: dirent not found", dentry); 1219 if (d_really_is_positive(dentry)) 1220 goto not_found; 1221 goto out_valid; 1222 1223 default: 1224 _debug("failed to iterate dir %pd: %d", 1225 parent, ret); 1226 goto not_found; 1227 } 1228 1229 out_valid: 1230 dentry->d_fsdata = (void *)(unsigned long)dir_version; 1231 out_valid_noupdate: 1232 dput(parent); 1233 key_put(key); 1234 _leave(" = 1 [valid]"); 1235 return 1; 1236 1237 not_found: 1238 _debug("dropping dentry %pd2", dentry); 1239 dput(parent); 1240 key_put(key); 1241 1242 _leave(" = 0 [bad]"); 1243 return 0; 1244 } 1245 1246 /* 1247 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 1248 * sleep) 1249 * - called from dput() when d_count is going to 0. 1250 * - return 1 to request dentry be unhashed, 0 otherwise 1251 */ 1252 static int afs_d_delete(const struct dentry *dentry) 1253 { 1254 _enter("%pd", dentry); 1255 1256 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1257 goto zap; 1258 1259 if (d_really_is_positive(dentry) && 1260 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 1261 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 1262 goto zap; 1263 1264 _leave(" = 0 [keep]"); 1265 return 0; 1266 1267 zap: 1268 _leave(" = 1 [zap]"); 1269 return 1; 1270 } 1271 1272 /* 1273 * Clean up sillyrename files on dentry removal. 1274 */ 1275 static void afs_d_iput(struct dentry *dentry, struct inode *inode) 1276 { 1277 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1278 afs_silly_iput(dentry, inode); 1279 iput(inode); 1280 } 1281 1282 /* 1283 * handle dentry release 1284 */ 1285 void afs_d_release(struct dentry *dentry) 1286 { 1287 _enter("%pd", dentry); 1288 } 1289 1290 void afs_check_for_remote_deletion(struct afs_operation *op) 1291 { 1292 struct afs_vnode *vnode = op->file[0].vnode; 1293 1294 switch (op->ac.abort_code) { 1295 case VNOVNODE: 1296 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1297 afs_break_callback(vnode, afs_cb_break_for_deleted); 1298 } 1299 } 1300 1301 /* 1302 * Create a new inode for create/mkdir/symlink 1303 */ 1304 static void afs_vnode_new_inode(struct afs_operation *op) 1305 { 1306 struct afs_vnode_param *vp = &op->file[1]; 1307 struct afs_vnode *vnode; 1308 struct inode *inode; 1309 1310 _enter(""); 1311 1312 ASSERTCMP(op->error, ==, 0); 1313 1314 inode = afs_iget(op, vp); 1315 if (IS_ERR(inode)) { 1316 /* ENOMEM or EINTR at a really inconvenient time - just abandon 1317 * the new directory on the server. 1318 */ 1319 op->error = PTR_ERR(inode); 1320 return; 1321 } 1322 1323 vnode = AFS_FS_I(inode); 1324 set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); 1325 if (!op->error) 1326 afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); 1327 d_instantiate(op->dentry, inode); 1328 } 1329 1330 static void afs_create_success(struct afs_operation *op) 1331 { 1332 _enter("op=%08x", op->debug_id); 1333 op->ctime = op->file[0].scb.status.mtime_client; 1334 afs_vnode_commit_status(op, &op->file[0]); 1335 afs_update_dentry_version(op, &op->file[0], op->dentry); 1336 afs_vnode_new_inode(op); 1337 } 1338 1339 static void afs_create_edit_dir(struct afs_operation *op) 1340 { 1341 struct afs_vnode_param *dvp = &op->file[0]; 1342 struct afs_vnode_param *vp = &op->file[1]; 1343 struct afs_vnode *dvnode = dvp->vnode; 1344 1345 _enter("op=%08x", op->debug_id); 1346 1347 down_write(&dvnode->validate_lock); 1348 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1349 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1350 afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid, 1351 op->create.reason); 1352 up_write(&dvnode->validate_lock); 1353 } 1354 1355 static void afs_create_put(struct afs_operation *op) 1356 { 1357 _enter("op=%08x", op->debug_id); 1358 1359 if (op->error) 1360 d_drop(op->dentry); 1361 } 1362 1363 static const struct afs_operation_ops afs_mkdir_operation = { 1364 .issue_afs_rpc = afs_fs_make_dir, 1365 .issue_yfs_rpc = yfs_fs_make_dir, 1366 .success = afs_create_success, 1367 .aborted = afs_check_for_remote_deletion, 1368 .edit_dir = afs_create_edit_dir, 1369 .put = afs_create_put, 1370 }; 1371 1372 /* 1373 * create a directory on an AFS filesystem 1374 */ 1375 static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 1376 struct dentry *dentry, umode_t mode) 1377 { 1378 struct afs_operation *op; 1379 struct afs_vnode *dvnode = AFS_FS_I(dir); 1380 1381 _enter("{%llx:%llu},{%pd},%ho", 1382 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1383 1384 op = afs_alloc_operation(NULL, dvnode->volume); 1385 if (IS_ERR(op)) { 1386 d_drop(dentry); 1387 return PTR_ERR(op); 1388 } 1389 1390 afs_op_set_vnode(op, 0, dvnode); 1391 op->file[0].dv_delta = 1; 1392 op->file[0].modification = true; 1393 op->file[0].update_ctime = true; 1394 op->dentry = dentry; 1395 op->create.mode = S_IFDIR | mode; 1396 op->create.reason = afs_edit_dir_for_mkdir; 1397 op->ops = &afs_mkdir_operation; 1398 return afs_do_sync_operation(op); 1399 } 1400 1401 /* 1402 * Remove a subdir from a directory. 1403 */ 1404 static void afs_dir_remove_subdir(struct dentry *dentry) 1405 { 1406 if (d_really_is_positive(dentry)) { 1407 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1408 1409 clear_nlink(&vnode->vfs_inode); 1410 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1411 clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags); 1412 clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags); 1413 } 1414 } 1415 1416 static void afs_rmdir_success(struct afs_operation *op) 1417 { 1418 _enter("op=%08x", op->debug_id); 1419 op->ctime = op->file[0].scb.status.mtime_client; 1420 afs_vnode_commit_status(op, &op->file[0]); 1421 afs_update_dentry_version(op, &op->file[0], op->dentry); 1422 } 1423 1424 static void afs_rmdir_edit_dir(struct afs_operation *op) 1425 { 1426 struct afs_vnode_param *dvp = &op->file[0]; 1427 struct afs_vnode *dvnode = dvp->vnode; 1428 1429 _enter("op=%08x", op->debug_id); 1430 afs_dir_remove_subdir(op->dentry); 1431 1432 down_write(&dvnode->validate_lock); 1433 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1434 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1435 afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1436 afs_edit_dir_for_rmdir); 1437 up_write(&dvnode->validate_lock); 1438 } 1439 1440 static void afs_rmdir_put(struct afs_operation *op) 1441 { 1442 _enter("op=%08x", op->debug_id); 1443 if (op->file[1].vnode) 1444 up_write(&op->file[1].vnode->rmdir_lock); 1445 } 1446 1447 static const struct afs_operation_ops afs_rmdir_operation = { 1448 .issue_afs_rpc = afs_fs_remove_dir, 1449 .issue_yfs_rpc = yfs_fs_remove_dir, 1450 .success = afs_rmdir_success, 1451 .aborted = afs_check_for_remote_deletion, 1452 .edit_dir = afs_rmdir_edit_dir, 1453 .put = afs_rmdir_put, 1454 }; 1455 1456 /* 1457 * remove a directory from an AFS filesystem 1458 */ 1459 static int afs_rmdir(struct inode *dir, struct dentry *dentry) 1460 { 1461 struct afs_operation *op; 1462 struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL; 1463 int ret; 1464 1465 _enter("{%llx:%llu},{%pd}", 1466 dvnode->fid.vid, dvnode->fid.vnode, dentry); 1467 1468 op = afs_alloc_operation(NULL, dvnode->volume); 1469 if (IS_ERR(op)) 1470 return PTR_ERR(op); 1471 1472 afs_op_set_vnode(op, 0, dvnode); 1473 op->file[0].dv_delta = 1; 1474 op->file[0].modification = true; 1475 op->file[0].update_ctime = true; 1476 1477 op->dentry = dentry; 1478 op->ops = &afs_rmdir_operation; 1479 1480 /* Try to make sure we have a callback promise on the victim. */ 1481 if (d_really_is_positive(dentry)) { 1482 vnode = AFS_FS_I(d_inode(dentry)); 1483 ret = afs_validate(vnode, op->key); 1484 if (ret < 0) 1485 goto error; 1486 } 1487 1488 if (vnode) { 1489 ret = down_write_killable(&vnode->rmdir_lock); 1490 if (ret < 0) 1491 goto error; 1492 op->file[1].vnode = vnode; 1493 } 1494 1495 return afs_do_sync_operation(op); 1496 1497 error: 1498 return afs_put_operation(op); 1499 } 1500 1501 /* 1502 * Remove a link to a file or symlink from a directory. 1503 * 1504 * If the file was not deleted due to excess hard links, the fileserver will 1505 * break the callback promise on the file - if it had one - before it returns 1506 * to us, and if it was deleted, it won't 1507 * 1508 * However, if we didn't have a callback promise outstanding, or it was 1509 * outstanding on a different server, then it won't break it either... 1510 */ 1511 static void afs_dir_remove_link(struct afs_operation *op) 1512 { 1513 struct afs_vnode *dvnode = op->file[0].vnode; 1514 struct afs_vnode *vnode = op->file[1].vnode; 1515 struct dentry *dentry = op->dentry; 1516 int ret; 1517 1518 if (op->error != 0 || 1519 (op->file[1].scb.have_status && op->file[1].scb.have_error)) 1520 return; 1521 if (d_really_is_positive(dentry)) 1522 return; 1523 1524 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 1525 /* Already done */ 1526 } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) { 1527 write_seqlock(&vnode->cb_lock); 1528 drop_nlink(&vnode->vfs_inode); 1529 if (vnode->vfs_inode.i_nlink == 0) { 1530 set_bit(AFS_VNODE_DELETED, &vnode->flags); 1531 __afs_break_callback(vnode, afs_cb_break_for_unlink); 1532 } 1533 write_sequnlock(&vnode->cb_lock); 1534 } else { 1535 afs_break_callback(vnode, afs_cb_break_for_unlink); 1536 1537 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 1538 _debug("AFS_VNODE_DELETED"); 1539 1540 ret = afs_validate(vnode, op->key); 1541 if (ret != -ESTALE) 1542 op->error = ret; 1543 } 1544 1545 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, op->error); 1546 } 1547 1548 static void afs_unlink_success(struct afs_operation *op) 1549 { 1550 _enter("op=%08x", op->debug_id); 1551 op->ctime = op->file[0].scb.status.mtime_client; 1552 afs_check_dir_conflict(op, &op->file[0]); 1553 afs_vnode_commit_status(op, &op->file[0]); 1554 afs_vnode_commit_status(op, &op->file[1]); 1555 afs_update_dentry_version(op, &op->file[0], op->dentry); 1556 afs_dir_remove_link(op); 1557 } 1558 1559 static void afs_unlink_edit_dir(struct afs_operation *op) 1560 { 1561 struct afs_vnode_param *dvp = &op->file[0]; 1562 struct afs_vnode *dvnode = dvp->vnode; 1563 1564 _enter("op=%08x", op->debug_id); 1565 down_write(&dvnode->validate_lock); 1566 if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) && 1567 dvnode->status.data_version == dvp->dv_before + dvp->dv_delta) 1568 afs_edit_dir_remove(dvnode, &op->dentry->d_name, 1569 afs_edit_dir_for_unlink); 1570 up_write(&dvnode->validate_lock); 1571 } 1572 1573 static void afs_unlink_put(struct afs_operation *op) 1574 { 1575 _enter("op=%08x", op->debug_id); 1576 if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT) 1577 d_rehash(op->dentry); 1578 } 1579 1580 static const struct afs_operation_ops afs_unlink_operation = { 1581 .issue_afs_rpc = afs_fs_remove_file, 1582 .issue_yfs_rpc = yfs_fs_remove_file, 1583 .success = afs_unlink_success, 1584 .aborted = afs_check_for_remote_deletion, 1585 .edit_dir = afs_unlink_edit_dir, 1586 .put = afs_unlink_put, 1587 }; 1588 1589 /* 1590 * Remove a file or symlink from an AFS filesystem. 1591 */ 1592 static int afs_unlink(struct inode *dir, struct dentry *dentry) 1593 { 1594 struct afs_operation *op; 1595 struct afs_vnode *dvnode = AFS_FS_I(dir); 1596 struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); 1597 int ret; 1598 1599 _enter("{%llx:%llu},{%pd}", 1600 dvnode->fid.vid, dvnode->fid.vnode, dentry); 1601 1602 if (dentry->d_name.len >= AFSNAMEMAX) 1603 return -ENAMETOOLONG; 1604 1605 op = afs_alloc_operation(NULL, dvnode->volume); 1606 if (IS_ERR(op)) 1607 return PTR_ERR(op); 1608 1609 afs_op_set_vnode(op, 0, dvnode); 1610 op->file[0].dv_delta = 1; 1611 op->file[0].modification = true; 1612 op->file[0].update_ctime = true; 1613 1614 /* Try to make sure we have a callback promise on the victim. */ 1615 ret = afs_validate(vnode, op->key); 1616 if (ret < 0) { 1617 op->error = ret; 1618 goto error; 1619 } 1620 1621 spin_lock(&dentry->d_lock); 1622 if (d_count(dentry) > 1) { 1623 spin_unlock(&dentry->d_lock); 1624 /* Start asynchronous writeout of the inode */ 1625 write_inode_now(d_inode(dentry), 0); 1626 op->error = afs_sillyrename(dvnode, vnode, dentry, op->key); 1627 goto error; 1628 } 1629 if (!d_unhashed(dentry)) { 1630 /* Prevent a race with RCU lookup. */ 1631 __d_drop(dentry); 1632 op->unlink.need_rehash = true; 1633 } 1634 spin_unlock(&dentry->d_lock); 1635 1636 op->file[1].vnode = vnode; 1637 op->file[1].update_ctime = true; 1638 op->file[1].op_unlinked = true; 1639 op->dentry = dentry; 1640 op->ops = &afs_unlink_operation; 1641 afs_begin_vnode_operation(op); 1642 afs_wait_for_operation(op); 1643 1644 /* If there was a conflict with a third party, check the status of the 1645 * unlinked vnode. 1646 */ 1647 if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) { 1648 op->file[1].update_ctime = false; 1649 op->fetch_status.which = 1; 1650 op->ops = &afs_fetch_status_operation; 1651 afs_begin_vnode_operation(op); 1652 afs_wait_for_operation(op); 1653 } 1654 1655 return afs_put_operation(op); 1656 1657 error: 1658 return afs_put_operation(op); 1659 } 1660 1661 static const struct afs_operation_ops afs_create_operation = { 1662 .issue_afs_rpc = afs_fs_create_file, 1663 .issue_yfs_rpc = yfs_fs_create_file, 1664 .success = afs_create_success, 1665 .aborted = afs_check_for_remote_deletion, 1666 .edit_dir = afs_create_edit_dir, 1667 .put = afs_create_put, 1668 }; 1669 1670 /* 1671 * create a regular file on an AFS filesystem 1672 */ 1673 static int afs_create(struct user_namespace *mnt_userns, struct inode *dir, 1674 struct dentry *dentry, umode_t mode, bool excl) 1675 { 1676 struct afs_operation *op; 1677 struct afs_vnode *dvnode = AFS_FS_I(dir); 1678 int ret = -ENAMETOOLONG; 1679 1680 _enter("{%llx:%llu},{%pd},%ho", 1681 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 1682 1683 if (dentry->d_name.len >= AFSNAMEMAX) 1684 goto error; 1685 1686 op = afs_alloc_operation(NULL, dvnode->volume); 1687 if (IS_ERR(op)) { 1688 ret = PTR_ERR(op); 1689 goto error; 1690 } 1691 1692 afs_op_set_vnode(op, 0, dvnode); 1693 op->file[0].dv_delta = 1; 1694 op->file[0].modification = true; 1695 op->file[0].update_ctime = true; 1696 1697 op->dentry = dentry; 1698 op->create.mode = S_IFREG | mode; 1699 op->create.reason = afs_edit_dir_for_create; 1700 op->ops = &afs_create_operation; 1701 return afs_do_sync_operation(op); 1702 1703 error: 1704 d_drop(dentry); 1705 _leave(" = %d", ret); 1706 return ret; 1707 } 1708 1709 static void afs_link_success(struct afs_operation *op) 1710 { 1711 struct afs_vnode_param *dvp = &op->file[0]; 1712 struct afs_vnode_param *vp = &op->file[1]; 1713 1714 _enter("op=%08x", op->debug_id); 1715 op->ctime = dvp->scb.status.mtime_client; 1716 afs_vnode_commit_status(op, dvp); 1717 afs_vnode_commit_status(op, vp); 1718 afs_update_dentry_version(op, dvp, op->dentry); 1719 if (op->dentry_2->d_parent == op->dentry->d_parent) 1720 afs_update_dentry_version(op, dvp, op->dentry_2); 1721 ihold(&vp->vnode->vfs_inode); 1722 d_instantiate(op->dentry, &vp->vnode->vfs_inode); 1723 } 1724 1725 static void afs_link_put(struct afs_operation *op) 1726 { 1727 _enter("op=%08x", op->debug_id); 1728 if (op->error) 1729 d_drop(op->dentry); 1730 } 1731 1732 static const struct afs_operation_ops afs_link_operation = { 1733 .issue_afs_rpc = afs_fs_link, 1734 .issue_yfs_rpc = yfs_fs_link, 1735 .success = afs_link_success, 1736 .aborted = afs_check_for_remote_deletion, 1737 .edit_dir = afs_create_edit_dir, 1738 .put = afs_link_put, 1739 }; 1740 1741 /* 1742 * create a hard link between files in an AFS filesystem 1743 */ 1744 static int afs_link(struct dentry *from, struct inode *dir, 1745 struct dentry *dentry) 1746 { 1747 struct afs_operation *op; 1748 struct afs_vnode *dvnode = AFS_FS_I(dir); 1749 struct afs_vnode *vnode = AFS_FS_I(d_inode(from)); 1750 int ret = -ENAMETOOLONG; 1751 1752 _enter("{%llx:%llu},{%llx:%llu},{%pd}", 1753 vnode->fid.vid, vnode->fid.vnode, 1754 dvnode->fid.vid, dvnode->fid.vnode, 1755 dentry); 1756 1757 if (dentry->d_name.len >= AFSNAMEMAX) 1758 goto error; 1759 1760 op = afs_alloc_operation(NULL, dvnode->volume); 1761 if (IS_ERR(op)) { 1762 ret = PTR_ERR(op); 1763 goto error; 1764 } 1765 1766 ret = afs_validate(vnode, op->key); 1767 if (ret < 0) 1768 goto error_op; 1769 1770 afs_op_set_vnode(op, 0, dvnode); 1771 afs_op_set_vnode(op, 1, vnode); 1772 op->file[0].dv_delta = 1; 1773 op->file[0].modification = true; 1774 op->file[0].update_ctime = true; 1775 op->file[1].update_ctime = true; 1776 1777 op->dentry = dentry; 1778 op->dentry_2 = from; 1779 op->ops = &afs_link_operation; 1780 op->create.reason = afs_edit_dir_for_link; 1781 return afs_do_sync_operation(op); 1782 1783 error_op: 1784 afs_put_operation(op); 1785 error: 1786 d_drop(dentry); 1787 _leave(" = %d", ret); 1788 return ret; 1789 } 1790 1791 static const struct afs_operation_ops afs_symlink_operation = { 1792 .issue_afs_rpc = afs_fs_symlink, 1793 .issue_yfs_rpc = yfs_fs_symlink, 1794 .success = afs_create_success, 1795 .aborted = afs_check_for_remote_deletion, 1796 .edit_dir = afs_create_edit_dir, 1797 .put = afs_create_put, 1798 }; 1799 1800 /* 1801 * create a symlink in an AFS filesystem 1802 */ 1803 static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1804 struct dentry *dentry, const char *content) 1805 { 1806 struct afs_operation *op; 1807 struct afs_vnode *dvnode = AFS_FS_I(dir); 1808 int ret; 1809 1810 _enter("{%llx:%llu},{%pd},%s", 1811 dvnode->fid.vid, dvnode->fid.vnode, dentry, 1812 content); 1813 1814 ret = -ENAMETOOLONG; 1815 if (dentry->d_name.len >= AFSNAMEMAX) 1816 goto error; 1817 1818 ret = -EINVAL; 1819 if (strlen(content) >= AFSPATHMAX) 1820 goto error; 1821 1822 op = afs_alloc_operation(NULL, dvnode->volume); 1823 if (IS_ERR(op)) { 1824 ret = PTR_ERR(op); 1825 goto error; 1826 } 1827 1828 afs_op_set_vnode(op, 0, dvnode); 1829 op->file[0].dv_delta = 1; 1830 1831 op->dentry = dentry; 1832 op->ops = &afs_symlink_operation; 1833 op->create.reason = afs_edit_dir_for_symlink; 1834 op->create.symlink = content; 1835 return afs_do_sync_operation(op); 1836 1837 error: 1838 d_drop(dentry); 1839 _leave(" = %d", ret); 1840 return ret; 1841 } 1842 1843 static void afs_rename_success(struct afs_operation *op) 1844 { 1845 _enter("op=%08x", op->debug_id); 1846 1847 op->ctime = op->file[0].scb.status.mtime_client; 1848 afs_check_dir_conflict(op, &op->file[1]); 1849 afs_vnode_commit_status(op, &op->file[0]); 1850 if (op->file[1].vnode != op->file[0].vnode) { 1851 op->ctime = op->file[1].scb.status.mtime_client; 1852 afs_vnode_commit_status(op, &op->file[1]); 1853 } 1854 } 1855 1856 static void afs_rename_edit_dir(struct afs_operation *op) 1857 { 1858 struct afs_vnode_param *orig_dvp = &op->file[0]; 1859 struct afs_vnode_param *new_dvp = &op->file[1]; 1860 struct afs_vnode *orig_dvnode = orig_dvp->vnode; 1861 struct afs_vnode *new_dvnode = new_dvp->vnode; 1862 struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry)); 1863 struct dentry *old_dentry = op->dentry; 1864 struct dentry *new_dentry = op->dentry_2; 1865 struct inode *new_inode; 1866 1867 _enter("op=%08x", op->debug_id); 1868 1869 if (op->rename.rehash) { 1870 d_rehash(op->rename.rehash); 1871 op->rename.rehash = NULL; 1872 } 1873 1874 down_write(&orig_dvnode->validate_lock); 1875 if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) && 1876 orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta) 1877 afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name, 1878 afs_edit_dir_for_rename_0); 1879 1880 if (new_dvnode != orig_dvnode) { 1881 up_write(&orig_dvnode->validate_lock); 1882 down_write(&new_dvnode->validate_lock); 1883 } 1884 1885 if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) && 1886 new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) { 1887 if (!op->rename.new_negative) 1888 afs_edit_dir_remove(new_dvnode, &new_dentry->d_name, 1889 afs_edit_dir_for_rename_1); 1890 1891 afs_edit_dir_add(new_dvnode, &new_dentry->d_name, 1892 &vnode->fid, afs_edit_dir_for_rename_2); 1893 } 1894 1895 new_inode = d_inode(new_dentry); 1896 if (new_inode) { 1897 spin_lock(&new_inode->i_lock); 1898 if (S_ISDIR(new_inode->i_mode)) 1899 clear_nlink(new_inode); 1900 else if (new_inode->i_nlink > 0) 1901 drop_nlink(new_inode); 1902 spin_unlock(&new_inode->i_lock); 1903 } 1904 1905 /* Now we can update d_fsdata on the dentries to reflect their 1906 * new parent's data_version. 1907 * 1908 * Note that if we ever implement RENAME_EXCHANGE, we'll have 1909 * to update both dentries with opposing dir versions. 1910 */ 1911 afs_update_dentry_version(op, new_dvp, op->dentry); 1912 afs_update_dentry_version(op, new_dvp, op->dentry_2); 1913 1914 d_move(old_dentry, new_dentry); 1915 1916 up_write(&new_dvnode->validate_lock); 1917 } 1918 1919 static void afs_rename_put(struct afs_operation *op) 1920 { 1921 _enter("op=%08x", op->debug_id); 1922 if (op->rename.rehash) 1923 d_rehash(op->rename.rehash); 1924 dput(op->rename.tmp); 1925 if (op->error) 1926 d_rehash(op->dentry); 1927 } 1928 1929 static const struct afs_operation_ops afs_rename_operation = { 1930 .issue_afs_rpc = afs_fs_rename, 1931 .issue_yfs_rpc = yfs_fs_rename, 1932 .success = afs_rename_success, 1933 .edit_dir = afs_rename_edit_dir, 1934 .put = afs_rename_put, 1935 }; 1936 1937 /* 1938 * rename a file in an AFS filesystem and/or move it between directories 1939 */ 1940 static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1941 struct dentry *old_dentry, struct inode *new_dir, 1942 struct dentry *new_dentry, unsigned int flags) 1943 { 1944 struct afs_operation *op; 1945 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1946 int ret; 1947 1948 if (flags) 1949 return -EINVAL; 1950 1951 /* Don't allow silly-rename files be moved around. */ 1952 if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED) 1953 return -EINVAL; 1954 1955 vnode = AFS_FS_I(d_inode(old_dentry)); 1956 orig_dvnode = AFS_FS_I(old_dir); 1957 new_dvnode = AFS_FS_I(new_dir); 1958 1959 _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}", 1960 orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1961 vnode->fid.vid, vnode->fid.vnode, 1962 new_dvnode->fid.vid, new_dvnode->fid.vnode, 1963 new_dentry); 1964 1965 op = afs_alloc_operation(NULL, orig_dvnode->volume); 1966 if (IS_ERR(op)) 1967 return PTR_ERR(op); 1968 1969 ret = afs_validate(vnode, op->key); 1970 op->error = ret; 1971 if (ret < 0) 1972 goto error; 1973 1974 afs_op_set_vnode(op, 0, orig_dvnode); 1975 afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */ 1976 op->file[0].dv_delta = 1; 1977 op->file[1].dv_delta = 1; 1978 op->file[0].modification = true; 1979 op->file[1].modification = true; 1980 op->file[0].update_ctime = true; 1981 op->file[1].update_ctime = true; 1982 1983 op->dentry = old_dentry; 1984 op->dentry_2 = new_dentry; 1985 op->rename.new_negative = d_is_negative(new_dentry); 1986 op->ops = &afs_rename_operation; 1987 1988 /* For non-directories, check whether the target is busy and if so, 1989 * make a copy of the dentry and then do a silly-rename. If the 1990 * silly-rename succeeds, the copied dentry is hashed and becomes the 1991 * new target. 1992 */ 1993 if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) { 1994 /* To prevent any new references to the target during the 1995 * rename, we unhash the dentry in advance. 1996 */ 1997 if (!d_unhashed(new_dentry)) { 1998 d_drop(new_dentry); 1999 op->rename.rehash = new_dentry; 2000 } 2001 2002 if (d_count(new_dentry) > 2) { 2003 /* copy the target dentry's name */ 2004 op->rename.tmp = d_alloc(new_dentry->d_parent, 2005 &new_dentry->d_name); 2006 if (!op->rename.tmp) { 2007 op->error = -ENOMEM; 2008 goto error; 2009 } 2010 2011 ret = afs_sillyrename(new_dvnode, 2012 AFS_FS_I(d_inode(new_dentry)), 2013 new_dentry, op->key); 2014 if (ret) { 2015 op->error = ret; 2016 goto error; 2017 } 2018 2019 op->dentry_2 = op->rename.tmp; 2020 op->rename.rehash = NULL; 2021 op->rename.new_negative = true; 2022 } 2023 } 2024 2025 /* This bit is potentially nasty as there's a potential race with 2026 * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry 2027 * to reflect it's new parent's new data_version after the op, but 2028 * d_revalidate may see old_dentry between the op having taken place 2029 * and the version being updated. 2030 * 2031 * So drop the old_dentry for now to make other threads go through 2032 * lookup instead - which we hold a lock against. 2033 */ 2034 d_drop(old_dentry); 2035 2036 return afs_do_sync_operation(op); 2037 2038 error: 2039 return afs_put_operation(op); 2040 } 2041 2042 /* 2043 * Release a directory page and clean up its private state if it's not busy 2044 * - return true if the page can now be released, false if not 2045 */ 2046 static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags) 2047 { 2048 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 2049 2050 _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index); 2051 2052 detach_page_private(page); 2053 2054 /* The directory will need reloading. */ 2055 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2056 afs_stat_v(dvnode, n_relpg); 2057 return 1; 2058 } 2059 2060 /* 2061 * invalidate part or all of a page 2062 * - release a page and clean up its private data if offset is 0 (indicating 2063 * the entire page) 2064 */ 2065 static void afs_dir_invalidatepage(struct page *page, unsigned int offset, 2066 unsigned int length) 2067 { 2068 struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host); 2069 2070 _enter("{%lu},%u,%u", page->index, offset, length); 2071 2072 BUG_ON(!PageLocked(page)); 2073 2074 /* The directory will need reloading. */ 2075 if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) 2076 afs_stat_v(dvnode, n_inval); 2077 2078 /* we clean up only if the entire page is being invalidated */ 2079 if (offset == 0 && length == thp_size(page)) 2080 detach_page_private(page); 2081 } 2082