1 /* dir.c: AFS filesystem directory handling 2 * 3 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/slab.h> 16 #include <linux/fs.h> 17 #include <linux/pagemap.h> 18 #include <linux/ctype.h> 19 #include <linux/sched.h> 20 #include "internal.h" 21 22 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 23 struct nameidata *nd); 24 static int afs_dir_open(struct inode *inode, struct file *file); 25 static int afs_readdir(struct file *file, void *dirent, filldir_t filldir); 26 static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd); 27 static int afs_d_delete(struct dentry *dentry); 28 static void afs_d_release(struct dentry *dentry); 29 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 30 loff_t fpos, u64 ino, unsigned dtype); 31 static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 32 struct nameidata *nd); 33 static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode); 34 static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35 static int afs_unlink(struct inode *dir, struct dentry *dentry); 36 static int afs_link(struct dentry *from, struct inode *dir, 37 struct dentry *dentry); 38 static int afs_symlink(struct inode *dir, struct dentry *dentry, 39 const char *content); 40 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 41 struct inode *new_dir, struct dentry *new_dentry); 42 43 const struct file_operations afs_dir_file_operations = { 44 .open = afs_dir_open, 45 .release = afs_release, 46 .readdir = afs_readdir, 47 .lock = afs_lock, 48 }; 49 50 const struct inode_operations afs_dir_inode_operations = { 51 .create = afs_create, 52 .lookup = afs_lookup, 53 .link = afs_link, 54 .unlink = afs_unlink, 55 .symlink = afs_symlink, 56 .mkdir = afs_mkdir, 57 .rmdir = afs_rmdir, 58 .rename = afs_rename, 59 .permission = afs_permission, 60 .getattr = afs_getattr, 61 .setattr = afs_setattr, 62 }; 63 64 static struct dentry_operations afs_fs_dentry_operations = { 65 .d_revalidate = afs_d_revalidate, 66 .d_delete = afs_d_delete, 67 .d_release = afs_d_release, 68 }; 69 70 #define AFS_DIR_HASHTBL_SIZE 128 71 #define AFS_DIR_DIRENT_SIZE 32 72 #define AFS_DIRENT_PER_BLOCK 64 73 74 union afs_dirent { 75 struct { 76 uint8_t valid; 77 uint8_t unused[1]; 78 __be16 hash_next; 79 __be32 vnode; 80 __be32 unique; 81 uint8_t name[16]; 82 uint8_t overflow[4]; /* if any char of the name (inc 83 * NUL) reaches here, consume 84 * the next dirent too */ 85 } u; 86 uint8_t extended_name[32]; 87 }; 88 89 /* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 90 struct afs_dir_pagehdr { 91 __be16 npages; 92 __be16 magic; 93 #define AFS_DIR_MAGIC htons(1234) 94 uint8_t nentries; 95 uint8_t bitmap[8]; 96 uint8_t pad[19]; 97 }; 98 99 /* directory block layout */ 100 union afs_dir_block { 101 102 struct afs_dir_pagehdr pagehdr; 103 104 struct { 105 struct afs_dir_pagehdr pagehdr; 106 uint8_t alloc_ctrs[128]; 107 /* dir hash table */ 108 uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 109 } hdr; 110 111 union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 112 }; 113 114 /* layout on a linux VM page */ 115 struct afs_dir_page { 116 union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 117 }; 118 119 struct afs_lookup_cookie { 120 struct afs_fid fid; 121 const char *name; 122 size_t nlen; 123 int found; 124 }; 125 126 /* 127 * check that a directory page is valid 128 */ 129 static inline void afs_dir_check_page(struct inode *dir, struct page *page) 130 { 131 struct afs_dir_page *dbuf; 132 loff_t latter; 133 int tmp, qty; 134 135 #if 0 136 /* check the page count */ 137 qty = desc.size / sizeof(dbuf->blocks[0]); 138 if (qty == 0) 139 goto error; 140 141 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 142 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 143 __FUNCTION__, dir->i_ino, qty, 144 ntohs(dbuf->blocks[0].pagehdr.npages)); 145 goto error; 146 } 147 #endif 148 149 /* determine how many magic numbers there should be in this page */ 150 latter = dir->i_size - page_offset(page); 151 if (latter >= PAGE_SIZE) 152 qty = PAGE_SIZE; 153 else 154 qty = latter; 155 qty /= sizeof(union afs_dir_block); 156 157 /* check them */ 158 dbuf = page_address(page); 159 for (tmp = 0; tmp < qty; tmp++) { 160 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 161 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 162 __FUNCTION__, dir->i_ino, tmp, qty, 163 ntohs(dbuf->blocks[tmp].pagehdr.magic)); 164 goto error; 165 } 166 } 167 168 SetPageChecked(page); 169 return; 170 171 error: 172 SetPageChecked(page); 173 SetPageError(page); 174 } 175 176 /* 177 * discard a page cached in the pagecache 178 */ 179 static inline void afs_dir_put_page(struct page *page) 180 { 181 kunmap(page); 182 page_cache_release(page); 183 } 184 185 /* 186 * get a page into the pagecache 187 */ 188 static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 189 struct key *key) 190 { 191 struct page *page; 192 struct file file = { 193 .private_data = key, 194 }; 195 196 _enter("{%lu},%lu", dir->i_ino, index); 197 198 page = read_mapping_page(dir->i_mapping, index, &file); 199 if (!IS_ERR(page)) { 200 kmap(page); 201 if (!PageChecked(page)) 202 afs_dir_check_page(dir, page); 203 if (PageError(page)) 204 goto fail; 205 } 206 return page; 207 208 fail: 209 afs_dir_put_page(page); 210 _leave(" = -EIO"); 211 return ERR_PTR(-EIO); 212 } 213 214 /* 215 * open an AFS directory file 216 */ 217 static int afs_dir_open(struct inode *inode, struct file *file) 218 { 219 _enter("{%lu}", inode->i_ino); 220 221 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 222 BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 223 224 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 225 return -ENOENT; 226 227 return afs_open(inode, file); 228 } 229 230 /* 231 * deal with one block in an AFS directory 232 */ 233 static int afs_dir_iterate_block(unsigned *fpos, 234 union afs_dir_block *block, 235 unsigned blkoff, 236 void *cookie, 237 filldir_t filldir) 238 { 239 union afs_dirent *dire; 240 unsigned offset, next, curr; 241 size_t nlen; 242 int tmp, ret; 243 244 _enter("%u,%x,%p,,",*fpos,blkoff,block); 245 246 curr = (*fpos - blkoff) / sizeof(union afs_dirent); 247 248 /* walk through the block, an entry at a time */ 249 for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 250 offset < AFS_DIRENT_PER_BLOCK; 251 offset = next 252 ) { 253 next = offset + 1; 254 255 /* skip entries marked unused in the bitmap */ 256 if (!(block->pagehdr.bitmap[offset / 8] & 257 (1 << (offset % 8)))) { 258 _debug("ENT[%Zu.%u]: unused", 259 blkoff / sizeof(union afs_dir_block), offset); 260 if (offset >= curr) 261 *fpos = blkoff + 262 next * sizeof(union afs_dirent); 263 continue; 264 } 265 266 /* got a valid entry */ 267 dire = &block->dirents[offset]; 268 nlen = strnlen(dire->u.name, 269 sizeof(*block) - 270 offset * sizeof(union afs_dirent)); 271 272 _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", 273 blkoff / sizeof(union afs_dir_block), offset, 274 (offset < curr ? "skip" : "fill"), 275 nlen, dire->u.name); 276 277 /* work out where the next possible entry is */ 278 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 279 if (next >= AFS_DIRENT_PER_BLOCK) { 280 _debug("ENT[%Zu.%u]:" 281 " %u travelled beyond end dir block" 282 " (len %u/%Zu)", 283 blkoff / sizeof(union afs_dir_block), 284 offset, next, tmp, nlen); 285 return -EIO; 286 } 287 if (!(block->pagehdr.bitmap[next / 8] & 288 (1 << (next % 8)))) { 289 _debug("ENT[%Zu.%u]:" 290 " %u unmarked extension (len %u/%Zu)", 291 blkoff / sizeof(union afs_dir_block), 292 offset, next, tmp, nlen); 293 return -EIO; 294 } 295 296 _debug("ENT[%Zu.%u]: ext %u/%Zu", 297 blkoff / sizeof(union afs_dir_block), 298 next, tmp, nlen); 299 next++; 300 } 301 302 /* skip if starts before the current position */ 303 if (offset < curr) 304 continue; 305 306 /* found the next entry */ 307 ret = filldir(cookie, 308 dire->u.name, 309 nlen, 310 blkoff + offset * sizeof(union afs_dirent), 311 ntohl(dire->u.vnode), 312 filldir == afs_lookup_filldir ? 313 ntohl(dire->u.unique) : DT_UNKNOWN); 314 if (ret < 0) { 315 _leave(" = 0 [full]"); 316 return 0; 317 } 318 319 *fpos = blkoff + next * sizeof(union afs_dirent); 320 } 321 322 _leave(" = 1 [more]"); 323 return 1; 324 } 325 326 /* 327 * iterate through the data blob that lists the contents of an AFS directory 328 */ 329 static int afs_dir_iterate(struct inode *dir, unsigned *fpos, void *cookie, 330 filldir_t filldir, struct key *key) 331 { 332 union afs_dir_block *dblock; 333 struct afs_dir_page *dbuf; 334 struct page *page; 335 unsigned blkoff, limit; 336 int ret; 337 338 _enter("{%lu},%u,,", dir->i_ino, *fpos); 339 340 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 341 _leave(" = -ESTALE"); 342 return -ESTALE; 343 } 344 345 /* round the file position up to the next entry boundary */ 346 *fpos += sizeof(union afs_dirent) - 1; 347 *fpos &= ~(sizeof(union afs_dirent) - 1); 348 349 /* walk through the blocks in sequence */ 350 ret = 0; 351 while (*fpos < dir->i_size) { 352 blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1); 353 354 /* fetch the appropriate page from the directory */ 355 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 356 if (IS_ERR(page)) { 357 ret = PTR_ERR(page); 358 break; 359 } 360 361 limit = blkoff & ~(PAGE_SIZE - 1); 362 363 dbuf = page_address(page); 364 365 /* deal with the individual blocks stashed on this page */ 366 do { 367 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 368 sizeof(union afs_dir_block)]; 369 ret = afs_dir_iterate_block(fpos, dblock, blkoff, 370 cookie, filldir); 371 if (ret != 1) { 372 afs_dir_put_page(page); 373 goto out; 374 } 375 376 blkoff += sizeof(union afs_dir_block); 377 378 } while (*fpos < dir->i_size && blkoff < limit); 379 380 afs_dir_put_page(page); 381 ret = 0; 382 } 383 384 out: 385 _leave(" = %d", ret); 386 return ret; 387 } 388 389 /* 390 * read an AFS directory 391 */ 392 static int afs_readdir(struct file *file, void *cookie, filldir_t filldir) 393 { 394 unsigned fpos; 395 int ret; 396 397 _enter("{%Ld,{%lu}}", 398 file->f_pos, file->f_path.dentry->d_inode->i_ino); 399 400 ASSERT(file->private_data != NULL); 401 402 fpos = file->f_pos; 403 ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos, 404 cookie, filldir, file->private_data); 405 file->f_pos = fpos; 406 407 _leave(" = %d", ret); 408 return ret; 409 } 410 411 /* 412 * search the directory for a name 413 * - if afs_dir_iterate_block() spots this function, it'll pass the FID 414 * uniquifier through dtype 415 */ 416 static int afs_lookup_filldir(void *_cookie, const char *name, int nlen, 417 loff_t fpos, u64 ino, unsigned dtype) 418 { 419 struct afs_lookup_cookie *cookie = _cookie; 420 421 _enter("{%s,%Zu},%s,%u,,%llu,%u", 422 cookie->name, cookie->nlen, name, nlen, 423 (unsigned long long) ino, dtype); 424 425 /* insanity checks first */ 426 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 427 BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 428 429 if (cookie->nlen != nlen || memcmp(cookie->name, name, nlen) != 0) { 430 _leave(" = 0 [no]"); 431 return 0; 432 } 433 434 cookie->fid.vnode = ino; 435 cookie->fid.unique = dtype; 436 cookie->found = 1; 437 438 _leave(" = -1 [found]"); 439 return -1; 440 } 441 442 /* 443 * do a lookup in a directory 444 * - just returns the FID the dentry name maps to if found 445 */ 446 static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 447 struct afs_fid *fid, struct key *key) 448 { 449 struct afs_lookup_cookie cookie; 450 struct afs_super_info *as; 451 unsigned fpos; 452 int ret; 453 454 _enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name); 455 456 as = dir->i_sb->s_fs_info; 457 458 /* search the directory */ 459 cookie.name = dentry->d_name.name; 460 cookie.nlen = dentry->d_name.len; 461 cookie.fid.vid = as->volume->vid; 462 cookie.found = 0; 463 464 fpos = 0; 465 ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir, 466 key); 467 if (ret < 0) { 468 _leave(" = %d [iter]", ret); 469 return ret; 470 } 471 472 ret = -ENOENT; 473 if (!cookie.found) { 474 _leave(" = -ENOENT [not found]"); 475 return -ENOENT; 476 } 477 478 *fid = cookie.fid; 479 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 480 return 0; 481 } 482 483 /* 484 * look up an entry in a directory 485 */ 486 static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 487 struct nameidata *nd) 488 { 489 struct afs_vnode *vnode; 490 struct afs_fid fid; 491 struct inode *inode; 492 struct key *key; 493 int ret; 494 495 vnode = AFS_FS_I(dir); 496 497 _enter("{%x:%u},%p{%s},", 498 vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name); 499 500 ASSERTCMP(dentry->d_inode, ==, NULL); 501 502 if (dentry->d_name.len >= AFSNAMEMAX) { 503 _leave(" = -ENAMETOOLONG"); 504 return ERR_PTR(-ENAMETOOLONG); 505 } 506 507 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 508 _leave(" = -ESTALE"); 509 return ERR_PTR(-ESTALE); 510 } 511 512 key = afs_request_key(vnode->volume->cell); 513 if (IS_ERR(key)) { 514 _leave(" = %ld [key]", PTR_ERR(key)); 515 return ERR_PTR(PTR_ERR(key)); 516 } 517 518 ret = afs_validate(vnode, key); 519 if (ret < 0) { 520 key_put(key); 521 _leave(" = %d [val]", ret); 522 return ERR_PTR(ret); 523 } 524 525 ret = afs_do_lookup(dir, dentry, &fid, key); 526 if (ret < 0) { 527 key_put(key); 528 if (ret == -ENOENT) { 529 d_add(dentry, NULL); 530 _leave(" = NULL [negative]"); 531 return NULL; 532 } 533 _leave(" = %d [do]", ret); 534 return ERR_PTR(ret); 535 } 536 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 537 538 /* instantiate the dentry */ 539 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 540 key_put(key); 541 if (IS_ERR(inode)) { 542 _leave(" = %ld", PTR_ERR(inode)); 543 return ERR_PTR(PTR_ERR(inode)); 544 } 545 546 dentry->d_op = &afs_fs_dentry_operations; 547 548 d_add(dentry, inode); 549 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%lu }", 550 fid.vnode, 551 fid.unique, 552 dentry->d_inode->i_ino, 553 dentry->d_inode->i_version); 554 555 return NULL; 556 } 557 558 /* 559 * check that a dentry lookup hit has found a valid entry 560 * - NOTE! the hit can be a negative hit too, so we can't assume we have an 561 * inode 562 */ 563 static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd) 564 { 565 struct afs_vnode *vnode, *dir; 566 struct afs_fid fid; 567 struct dentry *parent; 568 struct key *key; 569 void *dir_version; 570 int ret; 571 572 vnode = AFS_FS_I(dentry->d_inode); 573 574 if (dentry->d_inode) 575 _enter("{v={%x:%u} n=%s fl=%lx},", 576 vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, 577 vnode->flags); 578 else 579 _enter("{neg n=%s}", dentry->d_name.name); 580 581 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 582 if (IS_ERR(key)) 583 key = NULL; 584 585 /* lock down the parent dentry so we can peer at it */ 586 parent = dget_parent(dentry); 587 if (!parent->d_inode) 588 goto out_bad; 589 590 dir = AFS_FS_I(parent->d_inode); 591 592 /* validate the parent directory */ 593 if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 594 afs_validate(dir, key); 595 596 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 597 _debug("%s: parent dir deleted", dentry->d_name.name); 598 goto out_bad; 599 } 600 601 dir_version = (void *) (unsigned long) dir->status.data_version; 602 if (dentry->d_fsdata == dir_version) 603 goto out_valid; /* the dir contents are unchanged */ 604 605 _debug("dir modified"); 606 607 /* search the directory for this vnode */ 608 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 609 switch (ret) { 610 case 0: 611 /* the filename maps to something */ 612 if (!dentry->d_inode) 613 goto out_bad; 614 if (is_bad_inode(dentry->d_inode)) { 615 printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n", 616 parent->d_name.name, dentry->d_name.name); 617 goto out_bad; 618 } 619 620 /* if the vnode ID has changed, then the dirent points to a 621 * different file */ 622 if (fid.vnode != vnode->fid.vnode) { 623 _debug("%s: dirent changed [%u != %u]", 624 dentry->d_name.name, fid.vnode, 625 vnode->fid.vnode); 626 goto not_found; 627 } 628 629 /* if the vnode ID uniqifier has changed, then the file has 630 * been deleted and replaced, and the original vnode ID has 631 * been reused */ 632 if (fid.unique != vnode->fid.unique) { 633 _debug("%s: file deleted (uq %u -> %u I:%lu)", 634 dentry->d_name.name, fid.unique, 635 vnode->fid.unique, dentry->d_inode->i_version); 636 spin_lock(&vnode->lock); 637 set_bit(AFS_VNODE_DELETED, &vnode->flags); 638 spin_unlock(&vnode->lock); 639 goto not_found; 640 } 641 goto out_valid; 642 643 case -ENOENT: 644 /* the filename is unknown */ 645 _debug("%s: dirent not found", dentry->d_name.name); 646 if (dentry->d_inode) 647 goto not_found; 648 goto out_valid; 649 650 default: 651 _debug("failed to iterate dir %s: %d", 652 parent->d_name.name, ret); 653 goto out_bad; 654 } 655 656 out_valid: 657 dentry->d_fsdata = dir_version; 658 out_skip: 659 dput(parent); 660 key_put(key); 661 _leave(" = 1 [valid]"); 662 return 1; 663 664 /* the dirent, if it exists, now points to a different vnode */ 665 not_found: 666 spin_lock(&dentry->d_lock); 667 dentry->d_flags |= DCACHE_NFSFS_RENAMED; 668 spin_unlock(&dentry->d_lock); 669 670 out_bad: 671 if (dentry->d_inode) { 672 /* don't unhash if we have submounts */ 673 if (have_submounts(dentry)) 674 goto out_skip; 675 } 676 677 _debug("dropping dentry %s/%s", 678 parent->d_name.name, dentry->d_name.name); 679 shrink_dcache_parent(dentry); 680 d_drop(dentry); 681 dput(parent); 682 key_put(key); 683 684 _leave(" = 0 [bad]"); 685 return 0; 686 } 687 688 /* 689 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 690 * sleep) 691 * - called from dput() when d_count is going to 0. 692 * - return 1 to request dentry be unhashed, 0 otherwise 693 */ 694 static int afs_d_delete(struct dentry *dentry) 695 { 696 _enter("%s", dentry->d_name.name); 697 698 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 699 goto zap; 700 701 if (dentry->d_inode && 702 test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags)) 703 goto zap; 704 705 _leave(" = 0 [keep]"); 706 return 0; 707 708 zap: 709 _leave(" = 1 [zap]"); 710 return 1; 711 } 712 713 /* 714 * handle dentry release 715 */ 716 static void afs_d_release(struct dentry *dentry) 717 { 718 _enter("%s", dentry->d_name.name); 719 } 720 721 /* 722 * create a directory on an AFS filesystem 723 */ 724 static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 725 { 726 struct afs_file_status status; 727 struct afs_callback cb; 728 struct afs_server *server; 729 struct afs_vnode *dvnode, *vnode; 730 struct afs_fid fid; 731 struct inode *inode; 732 struct key *key; 733 int ret; 734 735 dvnode = AFS_FS_I(dir); 736 737 _enter("{%x:%u},{%s},%o", 738 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 739 740 ret = -ENAMETOOLONG; 741 if (dentry->d_name.len >= AFSNAMEMAX) 742 goto error; 743 744 key = afs_request_key(dvnode->volume->cell); 745 if (IS_ERR(key)) { 746 ret = PTR_ERR(key); 747 goto error; 748 } 749 750 mode |= S_IFDIR; 751 ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 752 mode, &fid, &status, &cb, &server); 753 if (ret < 0) 754 goto mkdir_error; 755 756 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 757 if (IS_ERR(inode)) { 758 /* ENOMEM at a really inconvenient time - just abandon the new 759 * directory on the server */ 760 ret = PTR_ERR(inode); 761 goto iget_error; 762 } 763 764 /* apply the status report we've got for the new vnode */ 765 vnode = AFS_FS_I(inode); 766 spin_lock(&vnode->lock); 767 vnode->update_cnt++; 768 spin_unlock(&vnode->lock); 769 afs_vnode_finalise_status_update(vnode, server); 770 afs_put_server(server); 771 772 d_instantiate(dentry, inode); 773 if (d_unhashed(dentry)) { 774 _debug("not hashed"); 775 d_rehash(dentry); 776 } 777 key_put(key); 778 _leave(" = 0"); 779 return 0; 780 781 iget_error: 782 afs_put_server(server); 783 mkdir_error: 784 key_put(key); 785 error: 786 d_drop(dentry); 787 _leave(" = %d", ret); 788 return ret; 789 } 790 791 /* 792 * remove a directory from an AFS filesystem 793 */ 794 static int afs_rmdir(struct inode *dir, struct dentry *dentry) 795 { 796 struct afs_vnode *dvnode, *vnode; 797 struct key *key; 798 int ret; 799 800 dvnode = AFS_FS_I(dir); 801 802 _enter("{%x:%u},{%s}", 803 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 804 805 ret = -ENAMETOOLONG; 806 if (dentry->d_name.len >= AFSNAMEMAX) 807 goto error; 808 809 key = afs_request_key(dvnode->volume->cell); 810 if (IS_ERR(key)) { 811 ret = PTR_ERR(key); 812 goto error; 813 } 814 815 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 816 if (ret < 0) 817 goto rmdir_error; 818 819 if (dentry->d_inode) { 820 vnode = AFS_FS_I(dentry->d_inode); 821 clear_nlink(&vnode->vfs_inode); 822 set_bit(AFS_VNODE_DELETED, &vnode->flags); 823 afs_discard_callback_on_delete(vnode); 824 } 825 826 key_put(key); 827 _leave(" = 0"); 828 return 0; 829 830 rmdir_error: 831 key_put(key); 832 error: 833 _leave(" = %d", ret); 834 return ret; 835 } 836 837 /* 838 * remove a file from an AFS filesystem 839 */ 840 static int afs_unlink(struct inode *dir, struct dentry *dentry) 841 { 842 struct afs_vnode *dvnode, *vnode; 843 struct key *key; 844 int ret; 845 846 dvnode = AFS_FS_I(dir); 847 848 _enter("{%x:%u},{%s}", 849 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name); 850 851 ret = -ENAMETOOLONG; 852 if (dentry->d_name.len >= AFSNAMEMAX) 853 goto error; 854 855 key = afs_request_key(dvnode->volume->cell); 856 if (IS_ERR(key)) { 857 ret = PTR_ERR(key); 858 goto error; 859 } 860 861 if (dentry->d_inode) { 862 vnode = AFS_FS_I(dentry->d_inode); 863 864 /* make sure we have a callback promise on the victim */ 865 ret = afs_validate(vnode, key); 866 if (ret < 0) 867 goto error; 868 } 869 870 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 871 if (ret < 0) 872 goto remove_error; 873 874 if (dentry->d_inode) { 875 /* if the file wasn't deleted due to excess hard links, the 876 * fileserver will break the callback promise on the file - if 877 * it had one - before it returns to us, and if it was deleted, 878 * it won't 879 * 880 * however, if we didn't have a callback promise outstanding, 881 * or it was outstanding on a different server, then it won't 882 * break it either... 883 */ 884 vnode = AFS_FS_I(dentry->d_inode); 885 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 886 _debug("AFS_VNODE_DELETED"); 887 if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 888 _debug("AFS_VNODE_CB_BROKEN"); 889 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 890 ret = afs_validate(vnode, key); 891 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 892 } 893 894 key_put(key); 895 _leave(" = 0"); 896 return 0; 897 898 remove_error: 899 key_put(key); 900 error: 901 _leave(" = %d", ret); 902 return ret; 903 } 904 905 /* 906 * create a regular file on an AFS filesystem 907 */ 908 static int afs_create(struct inode *dir, struct dentry *dentry, int mode, 909 struct nameidata *nd) 910 { 911 struct afs_file_status status; 912 struct afs_callback cb; 913 struct afs_server *server; 914 struct afs_vnode *dvnode, *vnode; 915 struct afs_fid fid; 916 struct inode *inode; 917 struct key *key; 918 int ret; 919 920 dvnode = AFS_FS_I(dir); 921 922 _enter("{%x:%u},{%s},%o,", 923 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode); 924 925 ret = -ENAMETOOLONG; 926 if (dentry->d_name.len >= AFSNAMEMAX) 927 goto error; 928 929 key = afs_request_key(dvnode->volume->cell); 930 if (IS_ERR(key)) { 931 ret = PTR_ERR(key); 932 goto error; 933 } 934 935 mode |= S_IFREG; 936 ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 937 mode, &fid, &status, &cb, &server); 938 if (ret < 0) 939 goto create_error; 940 941 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 942 if (IS_ERR(inode)) { 943 /* ENOMEM at a really inconvenient time - just abandon the new 944 * directory on the server */ 945 ret = PTR_ERR(inode); 946 goto iget_error; 947 } 948 949 /* apply the status report we've got for the new vnode */ 950 vnode = AFS_FS_I(inode); 951 spin_lock(&vnode->lock); 952 vnode->update_cnt++; 953 spin_unlock(&vnode->lock); 954 afs_vnode_finalise_status_update(vnode, server); 955 afs_put_server(server); 956 957 d_instantiate(dentry, inode); 958 if (d_unhashed(dentry)) { 959 _debug("not hashed"); 960 d_rehash(dentry); 961 } 962 key_put(key); 963 _leave(" = 0"); 964 return 0; 965 966 iget_error: 967 afs_put_server(server); 968 create_error: 969 key_put(key); 970 error: 971 d_drop(dentry); 972 _leave(" = %d", ret); 973 return ret; 974 } 975 976 /* 977 * create a hard link between files in an AFS filesystem 978 */ 979 static int afs_link(struct dentry *from, struct inode *dir, 980 struct dentry *dentry) 981 { 982 struct afs_vnode *dvnode, *vnode; 983 struct key *key; 984 int ret; 985 986 vnode = AFS_FS_I(from->d_inode); 987 dvnode = AFS_FS_I(dir); 988 989 _enter("{%x:%u},{%x:%u},{%s}", 990 vnode->fid.vid, vnode->fid.vnode, 991 dvnode->fid.vid, dvnode->fid.vnode, 992 dentry->d_name.name); 993 994 ret = -ENAMETOOLONG; 995 if (dentry->d_name.len >= AFSNAMEMAX) 996 goto error; 997 998 key = afs_request_key(dvnode->volume->cell); 999 if (IS_ERR(key)) { 1000 ret = PTR_ERR(key); 1001 goto error; 1002 } 1003 1004 ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 1005 if (ret < 0) 1006 goto link_error; 1007 1008 atomic_inc(&vnode->vfs_inode.i_count); 1009 d_instantiate(dentry, &vnode->vfs_inode); 1010 key_put(key); 1011 _leave(" = 0"); 1012 return 0; 1013 1014 link_error: 1015 key_put(key); 1016 error: 1017 d_drop(dentry); 1018 _leave(" = %d", ret); 1019 return ret; 1020 } 1021 1022 /* 1023 * create a symlink in an AFS filesystem 1024 */ 1025 static int afs_symlink(struct inode *dir, struct dentry *dentry, 1026 const char *content) 1027 { 1028 struct afs_file_status status; 1029 struct afs_server *server; 1030 struct afs_vnode *dvnode, *vnode; 1031 struct afs_fid fid; 1032 struct inode *inode; 1033 struct key *key; 1034 int ret; 1035 1036 dvnode = AFS_FS_I(dir); 1037 1038 _enter("{%x:%u},{%s},%s", 1039 dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 1040 content); 1041 1042 ret = -ENAMETOOLONG; 1043 if (dentry->d_name.len >= AFSNAMEMAX) 1044 goto error; 1045 1046 ret = -EINVAL; 1047 if (strlen(content) >= AFSPATHMAX) 1048 goto error; 1049 1050 key = afs_request_key(dvnode->volume->cell); 1051 if (IS_ERR(key)) { 1052 ret = PTR_ERR(key); 1053 goto error; 1054 } 1055 1056 ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1057 &fid, &status, &server); 1058 if (ret < 0) 1059 goto create_error; 1060 1061 inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1062 if (IS_ERR(inode)) { 1063 /* ENOMEM at a really inconvenient time - just abandon the new 1064 * directory on the server */ 1065 ret = PTR_ERR(inode); 1066 goto iget_error; 1067 } 1068 1069 /* apply the status report we've got for the new vnode */ 1070 vnode = AFS_FS_I(inode); 1071 spin_lock(&vnode->lock); 1072 vnode->update_cnt++; 1073 spin_unlock(&vnode->lock); 1074 afs_vnode_finalise_status_update(vnode, server); 1075 afs_put_server(server); 1076 1077 d_instantiate(dentry, inode); 1078 if (d_unhashed(dentry)) { 1079 _debug("not hashed"); 1080 d_rehash(dentry); 1081 } 1082 key_put(key); 1083 _leave(" = 0"); 1084 return 0; 1085 1086 iget_error: 1087 afs_put_server(server); 1088 create_error: 1089 key_put(key); 1090 error: 1091 d_drop(dentry); 1092 _leave(" = %d", ret); 1093 return ret; 1094 } 1095 1096 /* 1097 * rename a file in an AFS filesystem and/or move it between directories 1098 */ 1099 static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1100 struct inode *new_dir, struct dentry *new_dentry) 1101 { 1102 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1103 struct key *key; 1104 int ret; 1105 1106 vnode = AFS_FS_I(old_dentry->d_inode); 1107 orig_dvnode = AFS_FS_I(old_dir); 1108 new_dvnode = AFS_FS_I(new_dir); 1109 1110 _enter("{%x:%u},{%x:%u},{%x:%u},{%s}", 1111 orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1112 vnode->fid.vid, vnode->fid.vnode, 1113 new_dvnode->fid.vid, new_dvnode->fid.vnode, 1114 new_dentry->d_name.name); 1115 1116 ret = -ENAMETOOLONG; 1117 if (new_dentry->d_name.len >= AFSNAMEMAX) 1118 goto error; 1119 1120 key = afs_request_key(orig_dvnode->volume->cell); 1121 if (IS_ERR(key)) { 1122 ret = PTR_ERR(key); 1123 goto error; 1124 } 1125 1126 ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1127 old_dentry->d_name.name, 1128 new_dentry->d_name.name); 1129 if (ret < 0) 1130 goto rename_error; 1131 key_put(key); 1132 _leave(" = 0"); 1133 return 0; 1134 1135 rename_error: 1136 key_put(key); 1137 error: 1138 d_drop(new_dentry); 1139 _leave(" = %d", ret); 1140 return ret; 1141 } 1142