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/fs.h> 16#include <linux/namei.h> 17#include <linux/pagemap.h> 18#include <linux/ctype.h> 19#include <linux/sched.h> 20#include "internal.h" 21 22static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 23 unsigned int flags); 24static int afs_dir_open(struct inode *inode, struct file *file); 25static int afs_readdir(struct file *file, struct dir_context *ctx); 26static int afs_d_revalidate(struct dentry *dentry, unsigned int flags); 27static int afs_d_delete(const struct dentry *dentry); 28static void afs_d_release(struct dentry *dentry); 29static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen, 30 loff_t fpos, u64 ino, unsigned dtype); 31static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 32 bool excl); 33static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 34static int afs_rmdir(struct inode *dir, struct dentry *dentry); 35static int afs_unlink(struct inode *dir, struct dentry *dentry); 36static int afs_link(struct dentry *from, struct inode *dir, 37 struct dentry *dentry); 38static int afs_symlink(struct inode *dir, struct dentry *dentry, 39 const char *content); 40static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 41 struct inode *new_dir, struct dentry *new_dentry); 42 43const struct file_operations afs_dir_file_operations = { 44 .open = afs_dir_open, 45 .release = afs_release, 46 .iterate = afs_readdir, 47 .lock = afs_lock, 48 .llseek = generic_file_llseek, 49}; 50 51const struct inode_operations afs_dir_inode_operations = { 52 .create = afs_create, 53 .lookup = afs_lookup, 54 .link = afs_link, 55 .unlink = afs_unlink, 56 .symlink = afs_symlink, 57 .mkdir = afs_mkdir, 58 .rmdir = afs_rmdir, 59 .rename = afs_rename, 60 .permission = afs_permission, 61 .getattr = afs_getattr, 62 .setattr = afs_setattr, 63}; 64 65const struct dentry_operations afs_fs_dentry_operations = { 66 .d_revalidate = afs_d_revalidate, 67 .d_delete = afs_d_delete, 68 .d_release = afs_d_release, 69 .d_automount = afs_d_automount, 70}; 71 72#define AFS_DIR_HASHTBL_SIZE 128 73#define AFS_DIR_DIRENT_SIZE 32 74#define AFS_DIRENT_PER_BLOCK 64 75 76union afs_dirent { 77 struct { 78 uint8_t valid; 79 uint8_t unused[1]; 80 __be16 hash_next; 81 __be32 vnode; 82 __be32 unique; 83 uint8_t name[16]; 84 uint8_t overflow[4]; /* if any char of the name (inc 85 * NUL) reaches here, consume 86 * the next dirent too */ 87 } u; 88 uint8_t extended_name[32]; 89}; 90 91/* AFS directory page header (one at the beginning of every 2048-byte chunk) */ 92struct afs_dir_pagehdr { 93 __be16 npages; 94 __be16 magic; 95#define AFS_DIR_MAGIC htons(1234) 96 uint8_t nentries; 97 uint8_t bitmap[8]; 98 uint8_t pad[19]; 99}; 100 101/* directory block layout */ 102union afs_dir_block { 103 104 struct afs_dir_pagehdr pagehdr; 105 106 struct { 107 struct afs_dir_pagehdr pagehdr; 108 uint8_t alloc_ctrs[128]; 109 /* dir hash table */ 110 uint16_t hashtable[AFS_DIR_HASHTBL_SIZE]; 111 } hdr; 112 113 union afs_dirent dirents[AFS_DIRENT_PER_BLOCK]; 114}; 115 116/* layout on a linux VM page */ 117struct afs_dir_page { 118 union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)]; 119}; 120 121struct afs_lookup_cookie { 122 struct dir_context ctx; 123 struct afs_fid fid; 124 struct qstr name; 125 int found; 126}; 127 128/* 129 * check that a directory page is valid 130 */ 131static inline void afs_dir_check_page(struct inode *dir, struct page *page) 132{ 133 struct afs_dir_page *dbuf; 134 loff_t latter; 135 int tmp, qty; 136 137#if 0 138 /* check the page count */ 139 qty = desc.size / sizeof(dbuf->blocks[0]); 140 if (qty == 0) 141 goto error; 142 143 if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) { 144 printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n", 145 __func__, dir->i_ino, qty, 146 ntohs(dbuf->blocks[0].pagehdr.npages)); 147 goto error; 148 } 149#endif 150 151 /* determine how many magic numbers there should be in this page */ 152 latter = dir->i_size - page_offset(page); 153 if (latter >= PAGE_SIZE) 154 qty = PAGE_SIZE; 155 else 156 qty = latter; 157 qty /= sizeof(union afs_dir_block); 158 159 /* check them */ 160 dbuf = page_address(page); 161 for (tmp = 0; tmp < qty; tmp++) { 162 if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) { 163 printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n", 164 __func__, dir->i_ino, tmp, qty, 165 ntohs(dbuf->blocks[tmp].pagehdr.magic)); 166 goto error; 167 } 168 } 169 170 SetPageChecked(page); 171 return; 172 173error: 174 SetPageChecked(page); 175 SetPageError(page); 176} 177 178/* 179 * discard a page cached in the pagecache 180 */ 181static inline void afs_dir_put_page(struct page *page) 182{ 183 kunmap(page); 184 page_cache_release(page); 185} 186 187/* 188 * get a page into the pagecache 189 */ 190static struct page *afs_dir_get_page(struct inode *dir, unsigned long index, 191 struct key *key) 192{ 193 struct page *page; 194 _enter("{%lu},%lu", dir->i_ino, index); 195 196 page = read_cache_page(dir->i_mapping, index, afs_page_filler, key); 197 if (!IS_ERR(page)) { 198 kmap(page); 199 if (!PageChecked(page)) 200 afs_dir_check_page(dir, page); 201 if (PageError(page)) 202 goto fail; 203 } 204 return page; 205 206fail: 207 afs_dir_put_page(page); 208 _leave(" = -EIO"); 209 return ERR_PTR(-EIO); 210} 211 212/* 213 * open an AFS directory file 214 */ 215static int afs_dir_open(struct inode *inode, struct file *file) 216{ 217 _enter("{%lu}", inode->i_ino); 218 219 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 220 BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 221 222 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags)) 223 return -ENOENT; 224 225 return afs_open(inode, file); 226} 227 228/* 229 * deal with one block in an AFS directory 230 */ 231static int afs_dir_iterate_block(struct dir_context *ctx, 232 union afs_dir_block *block, 233 unsigned blkoff) 234{ 235 union afs_dirent *dire; 236 unsigned offset, next, curr; 237 size_t nlen; 238 int tmp; 239 240 _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block); 241 242 curr = (ctx->pos - blkoff) / sizeof(union afs_dirent); 243 244 /* walk through the block, an entry at a time */ 245 for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries; 246 offset < AFS_DIRENT_PER_BLOCK; 247 offset = next 248 ) { 249 next = offset + 1; 250 251 /* skip entries marked unused in the bitmap */ 252 if (!(block->pagehdr.bitmap[offset / 8] & 253 (1 << (offset % 8)))) { 254 _debug("ENT[%Zu.%u]: unused", 255 blkoff / sizeof(union afs_dir_block), offset); 256 if (offset >= curr) 257 ctx->pos = blkoff + 258 next * sizeof(union afs_dirent); 259 continue; 260 } 261 262 /* got a valid entry */ 263 dire = &block->dirents[offset]; 264 nlen = strnlen(dire->u.name, 265 sizeof(*block) - 266 offset * sizeof(union afs_dirent)); 267 268 _debug("ENT[%Zu.%u]: %s %Zu \"%s\"", 269 blkoff / sizeof(union afs_dir_block), offset, 270 (offset < curr ? "skip" : "fill"), 271 nlen, dire->u.name); 272 273 /* work out where the next possible entry is */ 274 for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) { 275 if (next >= AFS_DIRENT_PER_BLOCK) { 276 _debug("ENT[%Zu.%u]:" 277 " %u travelled beyond end dir block" 278 " (len %u/%Zu)", 279 blkoff / sizeof(union afs_dir_block), 280 offset, next, tmp, nlen); 281 return -EIO; 282 } 283 if (!(block->pagehdr.bitmap[next / 8] & 284 (1 << (next % 8)))) { 285 _debug("ENT[%Zu.%u]:" 286 " %u unmarked extension (len %u/%Zu)", 287 blkoff / sizeof(union afs_dir_block), 288 offset, next, tmp, nlen); 289 return -EIO; 290 } 291 292 _debug("ENT[%Zu.%u]: ext %u/%Zu", 293 blkoff / sizeof(union afs_dir_block), 294 next, tmp, nlen); 295 next++; 296 } 297 298 /* skip if starts before the current position */ 299 if (offset < curr) 300 continue; 301 302 /* found the next entry */ 303 if (!dir_emit(ctx, dire->u.name, nlen, 304 ntohl(dire->u.vnode), 305 ctx->actor == afs_lookup_filldir ? 306 ntohl(dire->u.unique) : DT_UNKNOWN)) { 307 _leave(" = 0 [full]"); 308 return 0; 309 } 310 311 ctx->pos = blkoff + next * sizeof(union afs_dirent); 312 } 313 314 _leave(" = 1 [more]"); 315 return 1; 316} 317 318/* 319 * iterate through the data blob that lists the contents of an AFS directory 320 */ 321static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx, 322 struct key *key) 323{ 324 union afs_dir_block *dblock; 325 struct afs_dir_page *dbuf; 326 struct page *page; 327 unsigned blkoff, limit; 328 int ret; 329 330 _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos); 331 332 if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) { 333 _leave(" = -ESTALE"); 334 return -ESTALE; 335 } 336 337 /* round the file position up to the next entry boundary */ 338 ctx->pos += sizeof(union afs_dirent) - 1; 339 ctx->pos &= ~(sizeof(union afs_dirent) - 1); 340 341 /* walk through the blocks in sequence */ 342 ret = 0; 343 while (ctx->pos < dir->i_size) { 344 blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1); 345 346 /* fetch the appropriate page from the directory */ 347 page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key); 348 if (IS_ERR(page)) { 349 ret = PTR_ERR(page); 350 break; 351 } 352 353 limit = blkoff & ~(PAGE_SIZE - 1); 354 355 dbuf = page_address(page); 356 357 /* deal with the individual blocks stashed on this page */ 358 do { 359 dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) / 360 sizeof(union afs_dir_block)]; 361 ret = afs_dir_iterate_block(ctx, dblock, blkoff); 362 if (ret != 1) { 363 afs_dir_put_page(page); 364 goto out; 365 } 366 367 blkoff += sizeof(union afs_dir_block); 368 369 } while (ctx->pos < dir->i_size && blkoff < limit); 370 371 afs_dir_put_page(page); 372 ret = 0; 373 } 374 375out: 376 _leave(" = %d", ret); 377 return ret; 378} 379 380/* 381 * read an AFS directory 382 */ 383static int afs_readdir(struct file *file, struct dir_context *ctx) 384{ 385 return afs_dir_iterate(file_inode(file), 386 ctx, file->private_data); 387} 388 389/* 390 * search the directory for a name 391 * - if afs_dir_iterate_block() spots this function, it'll pass the FID 392 * uniquifier through dtype 393 */ 394static int afs_lookup_filldir(struct dir_context *ctx, const char *name, 395 int nlen, loff_t fpos, u64 ino, unsigned dtype) 396{ 397 struct afs_lookup_cookie *cookie = 398 container_of(ctx, struct afs_lookup_cookie, ctx); 399 400 _enter("{%s,%u},%s,%u,,%llu,%u", 401 cookie->name.name, cookie->name.len, name, nlen, 402 (unsigned long long) ino, dtype); 403 404 /* insanity checks first */ 405 BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048); 406 BUILD_BUG_ON(sizeof(union afs_dirent) != 32); 407 408 if (cookie->name.len != nlen || 409 memcmp(cookie->name.name, name, nlen) != 0) { 410 _leave(" = 0 [no]"); 411 return 0; 412 } 413 414 cookie->fid.vnode = ino; 415 cookie->fid.unique = dtype; 416 cookie->found = 1; 417 418 _leave(" = -1 [found]"); 419 return -1; 420} 421 422/* 423 * do a lookup in a directory 424 * - just returns the FID the dentry name maps to if found 425 */ 426static int afs_do_lookup(struct inode *dir, struct dentry *dentry, 427 struct afs_fid *fid, struct key *key) 428{ 429 struct afs_super_info *as = dir->i_sb->s_fs_info; 430 struct afs_lookup_cookie cookie = { 431 .ctx.actor = afs_lookup_filldir, 432 .name = dentry->d_name, 433 .fid.vid = as->volume->vid 434 }; 435 int ret; 436 437 _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry); 438 439 /* search the directory */ 440 ret = afs_dir_iterate(dir, &cookie.ctx, key); 441 if (ret < 0) { 442 _leave(" = %d [iter]", ret); 443 return ret; 444 } 445 446 ret = -ENOENT; 447 if (!cookie.found) { 448 _leave(" = -ENOENT [not found]"); 449 return -ENOENT; 450 } 451 452 *fid = cookie.fid; 453 _leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique); 454 return 0; 455} 456 457/* 458 * Try to auto mount the mountpoint with pseudo directory, if the autocell 459 * operation is setted. 460 */ 461static struct inode *afs_try_auto_mntpt( 462 int ret, struct dentry *dentry, struct inode *dir, struct key *key, 463 struct afs_fid *fid) 464{ 465 const char *devname = dentry->d_name.name; 466 struct afs_vnode *vnode = AFS_FS_I(dir); 467 struct inode *inode; 468 469 _enter("%d, %p{%pd}, {%x:%u}, %p", 470 ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key); 471 472 if (ret != -ENOENT || 473 !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags)) 474 goto out; 475 476 inode = afs_iget_autocell(dir, devname, strlen(devname), key); 477 if (IS_ERR(inode)) { 478 ret = PTR_ERR(inode); 479 goto out; 480 } 481 482 *fid = AFS_FS_I(inode)->fid; 483 _leave("= %p", inode); 484 return inode; 485 486out: 487 _leave("= %d", ret); 488 return ERR_PTR(ret); 489} 490 491/* 492 * look up an entry in a directory 493 */ 494static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 495 unsigned int flags) 496{ 497 struct afs_vnode *vnode; 498 struct afs_fid fid; 499 struct inode *inode; 500 struct key *key; 501 int ret; 502 503 vnode = AFS_FS_I(dir); 504 505 _enter("{%x:%u},%p{%pd},", 506 vnode->fid.vid, vnode->fid.vnode, dentry, dentry); 507 508 ASSERTCMP(d_inode(dentry), ==, NULL); 509 510 if (dentry->d_name.len >= AFSNAMEMAX) { 511 _leave(" = -ENAMETOOLONG"); 512 return ERR_PTR(-ENAMETOOLONG); 513 } 514 515 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { 516 _leave(" = -ESTALE"); 517 return ERR_PTR(-ESTALE); 518 } 519 520 key = afs_request_key(vnode->volume->cell); 521 if (IS_ERR(key)) { 522 _leave(" = %ld [key]", PTR_ERR(key)); 523 return ERR_CAST(key); 524 } 525 526 ret = afs_validate(vnode, key); 527 if (ret < 0) { 528 key_put(key); 529 _leave(" = %d [val]", ret); 530 return ERR_PTR(ret); 531 } 532 533 ret = afs_do_lookup(dir, dentry, &fid, key); 534 if (ret < 0) { 535 inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid); 536 if (!IS_ERR(inode)) { 537 key_put(key); 538 goto success; 539 } 540 541 ret = PTR_ERR(inode); 542 key_put(key); 543 if (ret == -ENOENT) { 544 d_add(dentry, NULL); 545 _leave(" = NULL [negative]"); 546 return NULL; 547 } 548 _leave(" = %d [do]", ret); 549 return ERR_PTR(ret); 550 } 551 dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version; 552 553 /* instantiate the dentry */ 554 inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL); 555 key_put(key); 556 if (IS_ERR(inode)) { 557 _leave(" = %ld", PTR_ERR(inode)); 558 return ERR_CAST(inode); 559 } 560 561success: 562 d_add(dentry, inode); 563 _leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }", 564 fid.vnode, 565 fid.unique, 566 d_inode(dentry)->i_ino, 567 d_inode(dentry)->i_generation); 568 569 return NULL; 570} 571 572/* 573 * check that a dentry lookup hit has found a valid entry 574 * - NOTE! the hit can be a negative hit too, so we can't assume we have an 575 * inode 576 */ 577static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 578{ 579 struct afs_vnode *vnode, *dir; 580 struct afs_fid uninitialized_var(fid); 581 struct dentry *parent; 582 struct key *key; 583 void *dir_version; 584 int ret; 585 586 if (flags & LOOKUP_RCU) 587 return -ECHILD; 588 589 vnode = AFS_FS_I(d_inode(dentry)); 590 591 if (d_really_is_positive(dentry)) 592 _enter("{v={%x:%u} n=%pd fl=%lx},", 593 vnode->fid.vid, vnode->fid.vnode, dentry, 594 vnode->flags); 595 else 596 _enter("{neg n=%pd}", dentry); 597 598 key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell); 599 if (IS_ERR(key)) 600 key = NULL; 601 602 /* lock down the parent dentry so we can peer at it */ 603 parent = dget_parent(dentry); 604 dir = AFS_FS_I(d_inode(parent)); 605 606 /* validate the parent directory */ 607 if (test_bit(AFS_VNODE_MODIFIED, &dir->flags)) 608 afs_validate(dir, key); 609 610 if (test_bit(AFS_VNODE_DELETED, &dir->flags)) { 611 _debug("%pd: parent dir deleted", dentry); 612 goto out_bad; 613 } 614 615 dir_version = (void *) (unsigned long) dir->status.data_version; 616 if (dentry->d_fsdata == dir_version) 617 goto out_valid; /* the dir contents are unchanged */ 618 619 _debug("dir modified"); 620 621 /* search the directory for this vnode */ 622 ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key); 623 switch (ret) { 624 case 0: 625 /* the filename maps to something */ 626 if (d_really_is_negative(dentry)) 627 goto out_bad; 628 if (is_bad_inode(d_inode(dentry))) { 629 printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n", 630 dentry); 631 goto out_bad; 632 } 633 634 /* if the vnode ID has changed, then the dirent points to a 635 * different file */ 636 if (fid.vnode != vnode->fid.vnode) { 637 _debug("%pd: dirent changed [%u != %u]", 638 dentry, fid.vnode, 639 vnode->fid.vnode); 640 goto not_found; 641 } 642 643 /* if the vnode ID uniqifier has changed, then the file has 644 * been deleted and replaced, and the original vnode ID has 645 * been reused */ 646 if (fid.unique != vnode->fid.unique) { 647 _debug("%pd: file deleted (uq %u -> %u I:%u)", 648 dentry, fid.unique, 649 vnode->fid.unique, 650 d_inode(dentry)->i_generation); 651 spin_lock(&vnode->lock); 652 set_bit(AFS_VNODE_DELETED, &vnode->flags); 653 spin_unlock(&vnode->lock); 654 goto not_found; 655 } 656 goto out_valid; 657 658 case -ENOENT: 659 /* the filename is unknown */ 660 _debug("%pd: dirent not found", dentry); 661 if (d_really_is_positive(dentry)) 662 goto not_found; 663 goto out_valid; 664 665 default: 666 _debug("failed to iterate dir %pd: %d", 667 parent, ret); 668 goto out_bad; 669 } 670 671out_valid: 672 dentry->d_fsdata = dir_version; 673 dput(parent); 674 key_put(key); 675 _leave(" = 1 [valid]"); 676 return 1; 677 678 /* the dirent, if it exists, now points to a different vnode */ 679not_found: 680 spin_lock(&dentry->d_lock); 681 dentry->d_flags |= DCACHE_NFSFS_RENAMED; 682 spin_unlock(&dentry->d_lock); 683 684out_bad: 685 _debug("dropping dentry %pd2", dentry); 686 dput(parent); 687 key_put(key); 688 689 _leave(" = 0 [bad]"); 690 return 0; 691} 692 693/* 694 * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't 695 * sleep) 696 * - called from dput() when d_count is going to 0. 697 * - return 1 to request dentry be unhashed, 0 otherwise 698 */ 699static int afs_d_delete(const struct dentry *dentry) 700{ 701 _enter("%pd", dentry); 702 703 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 704 goto zap; 705 706 if (d_really_is_positive(dentry) && 707 (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) || 708 test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags))) 709 goto zap; 710 711 _leave(" = 0 [keep]"); 712 return 0; 713 714zap: 715 _leave(" = 1 [zap]"); 716 return 1; 717} 718 719/* 720 * handle dentry release 721 */ 722static void afs_d_release(struct dentry *dentry) 723{ 724 _enter("%pd", dentry); 725} 726 727/* 728 * create a directory on an AFS filesystem 729 */ 730static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 731{ 732 struct afs_file_status status; 733 struct afs_callback cb; 734 struct afs_server *server; 735 struct afs_vnode *dvnode, *vnode; 736 struct afs_fid fid; 737 struct inode *inode; 738 struct key *key; 739 int ret; 740 741 dvnode = AFS_FS_I(dir); 742 743 _enter("{%x:%u},{%pd},%ho", 744 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 745 746 key = afs_request_key(dvnode->volume->cell); 747 if (IS_ERR(key)) { 748 ret = PTR_ERR(key); 749 goto error; 750 } 751 752 mode |= S_IFDIR; 753 ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 754 mode, &fid, &status, &cb, &server); 755 if (ret < 0) 756 goto mkdir_error; 757 758 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 759 if (IS_ERR(inode)) { 760 /* ENOMEM at a really inconvenient time - just abandon the new 761 * directory on the server */ 762 ret = PTR_ERR(inode); 763 goto iget_error; 764 } 765 766 /* apply the status report we've got for the new vnode */ 767 vnode = AFS_FS_I(inode); 768 spin_lock(&vnode->lock); 769 vnode->update_cnt++; 770 spin_unlock(&vnode->lock); 771 afs_vnode_finalise_status_update(vnode, server); 772 afs_put_server(server); 773 774 d_instantiate(dentry, inode); 775 if (d_unhashed(dentry)) { 776 _debug("not hashed"); 777 d_rehash(dentry); 778 } 779 key_put(key); 780 _leave(" = 0"); 781 return 0; 782 783iget_error: 784 afs_put_server(server); 785mkdir_error: 786 key_put(key); 787error: 788 d_drop(dentry); 789 _leave(" = %d", ret); 790 return ret; 791} 792 793/* 794 * remove a directory from an AFS filesystem 795 */ 796static int afs_rmdir(struct inode *dir, struct dentry *dentry) 797{ 798 struct afs_vnode *dvnode, *vnode; 799 struct key *key; 800 int ret; 801 802 dvnode = AFS_FS_I(dir); 803 804 _enter("{%x:%u},{%pd}", 805 dvnode->fid.vid, dvnode->fid.vnode, dentry); 806 807 key = afs_request_key(dvnode->volume->cell); 808 if (IS_ERR(key)) { 809 ret = PTR_ERR(key); 810 goto error; 811 } 812 813 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true); 814 if (ret < 0) 815 goto rmdir_error; 816 817 if (d_really_is_positive(dentry)) { 818 vnode = AFS_FS_I(d_inode(dentry)); 819 clear_nlink(&vnode->vfs_inode); 820 set_bit(AFS_VNODE_DELETED, &vnode->flags); 821 afs_discard_callback_on_delete(vnode); 822 } 823 824 key_put(key); 825 _leave(" = 0"); 826 return 0; 827 828rmdir_error: 829 key_put(key); 830error: 831 _leave(" = %d", ret); 832 return ret; 833} 834 835/* 836 * remove a file from an AFS filesystem 837 */ 838static int afs_unlink(struct inode *dir, struct dentry *dentry) 839{ 840 struct afs_vnode *dvnode, *vnode; 841 struct key *key; 842 int ret; 843 844 dvnode = AFS_FS_I(dir); 845 846 _enter("{%x:%u},{%pd}", 847 dvnode->fid.vid, dvnode->fid.vnode, dentry); 848 849 ret = -ENAMETOOLONG; 850 if (dentry->d_name.len >= AFSNAMEMAX) 851 goto error; 852 853 key = afs_request_key(dvnode->volume->cell); 854 if (IS_ERR(key)) { 855 ret = PTR_ERR(key); 856 goto error; 857 } 858 859 if (d_really_is_positive(dentry)) { 860 vnode = AFS_FS_I(d_inode(dentry)); 861 862 /* make sure we have a callback promise on the victim */ 863 ret = afs_validate(vnode, key); 864 if (ret < 0) 865 goto error; 866 } 867 868 ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false); 869 if (ret < 0) 870 goto remove_error; 871 872 if (d_really_is_positive(dentry)) { 873 /* if the file wasn't deleted due to excess hard links, the 874 * fileserver will break the callback promise on the file - if 875 * it had one - before it returns to us, and if it was deleted, 876 * it won't 877 * 878 * however, if we didn't have a callback promise outstanding, 879 * or it was outstanding on a different server, then it won't 880 * break it either... 881 */ 882 vnode = AFS_FS_I(d_inode(dentry)); 883 if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) 884 _debug("AFS_VNODE_DELETED"); 885 if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) 886 _debug("AFS_VNODE_CB_BROKEN"); 887 set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); 888 ret = afs_validate(vnode, key); 889 _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret); 890 } 891 892 key_put(key); 893 _leave(" = 0"); 894 return 0; 895 896remove_error: 897 key_put(key); 898error: 899 _leave(" = %d", ret); 900 return ret; 901} 902 903/* 904 * create a regular file on an AFS filesystem 905 */ 906static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 907 bool excl) 908{ 909 struct afs_file_status status; 910 struct afs_callback cb; 911 struct afs_server *server; 912 struct afs_vnode *dvnode, *vnode; 913 struct afs_fid fid; 914 struct inode *inode; 915 struct key *key; 916 int ret; 917 918 dvnode = AFS_FS_I(dir); 919 920 _enter("{%x:%u},{%pd},%ho,", 921 dvnode->fid.vid, dvnode->fid.vnode, dentry, mode); 922 923 key = afs_request_key(dvnode->volume->cell); 924 if (IS_ERR(key)) { 925 ret = PTR_ERR(key); 926 goto error; 927 } 928 929 mode |= S_IFREG; 930 ret = afs_vnode_create(dvnode, key, dentry->d_name.name, 931 mode, &fid, &status, &cb, &server); 932 if (ret < 0) 933 goto create_error; 934 935 inode = afs_iget(dir->i_sb, key, &fid, &status, &cb); 936 if (IS_ERR(inode)) { 937 /* ENOMEM at a really inconvenient time - just abandon the new 938 * directory on the server */ 939 ret = PTR_ERR(inode); 940 goto iget_error; 941 } 942 943 /* apply the status report we've got for the new vnode */ 944 vnode = AFS_FS_I(inode); 945 spin_lock(&vnode->lock); 946 vnode->update_cnt++; 947 spin_unlock(&vnode->lock); 948 afs_vnode_finalise_status_update(vnode, server); 949 afs_put_server(server); 950 951 d_instantiate(dentry, inode); 952 if (d_unhashed(dentry)) { 953 _debug("not hashed"); 954 d_rehash(dentry); 955 } 956 key_put(key); 957 _leave(" = 0"); 958 return 0; 959 960iget_error: 961 afs_put_server(server); 962create_error: 963 key_put(key); 964error: 965 d_drop(dentry); 966 _leave(" = %d", ret); 967 return ret; 968} 969 970/* 971 * create a hard link between files in an AFS filesystem 972 */ 973static int afs_link(struct dentry *from, struct inode *dir, 974 struct dentry *dentry) 975{ 976 struct afs_vnode *dvnode, *vnode; 977 struct key *key; 978 int ret; 979 980 vnode = AFS_FS_I(d_inode(from)); 981 dvnode = AFS_FS_I(dir); 982 983 _enter("{%x:%u},{%x:%u},{%pd}", 984 vnode->fid.vid, vnode->fid.vnode, 985 dvnode->fid.vid, dvnode->fid.vnode, 986 dentry); 987 988 key = afs_request_key(dvnode->volume->cell); 989 if (IS_ERR(key)) { 990 ret = PTR_ERR(key); 991 goto error; 992 } 993 994 ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name); 995 if (ret < 0) 996 goto link_error; 997 998 ihold(&vnode->vfs_inode); 999 d_instantiate(dentry, &vnode->vfs_inode); 1000 key_put(key); 1001 _leave(" = 0"); 1002 return 0; 1003 1004link_error: 1005 key_put(key); 1006error: 1007 d_drop(dentry); 1008 _leave(" = %d", ret); 1009 return ret; 1010} 1011 1012/* 1013 * create a symlink in an AFS filesystem 1014 */ 1015static int afs_symlink(struct inode *dir, struct dentry *dentry, 1016 const char *content) 1017{ 1018 struct afs_file_status status; 1019 struct afs_server *server; 1020 struct afs_vnode *dvnode, *vnode; 1021 struct afs_fid fid; 1022 struct inode *inode; 1023 struct key *key; 1024 int ret; 1025 1026 dvnode = AFS_FS_I(dir); 1027 1028 _enter("{%x:%u},{%pd},%s", 1029 dvnode->fid.vid, dvnode->fid.vnode, dentry, 1030 content); 1031 1032 ret = -EINVAL; 1033 if (strlen(content) >= AFSPATHMAX) 1034 goto error; 1035 1036 key = afs_request_key(dvnode->volume->cell); 1037 if (IS_ERR(key)) { 1038 ret = PTR_ERR(key); 1039 goto error; 1040 } 1041 1042 ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content, 1043 &fid, &status, &server); 1044 if (ret < 0) 1045 goto create_error; 1046 1047 inode = afs_iget(dir->i_sb, key, &fid, &status, NULL); 1048 if (IS_ERR(inode)) { 1049 /* ENOMEM at a really inconvenient time - just abandon the new 1050 * directory on the server */ 1051 ret = PTR_ERR(inode); 1052 goto iget_error; 1053 } 1054 1055 /* apply the status report we've got for the new vnode */ 1056 vnode = AFS_FS_I(inode); 1057 spin_lock(&vnode->lock); 1058 vnode->update_cnt++; 1059 spin_unlock(&vnode->lock); 1060 afs_vnode_finalise_status_update(vnode, server); 1061 afs_put_server(server); 1062 1063 d_instantiate(dentry, inode); 1064 if (d_unhashed(dentry)) { 1065 _debug("not hashed"); 1066 d_rehash(dentry); 1067 } 1068 key_put(key); 1069 _leave(" = 0"); 1070 return 0; 1071 1072iget_error: 1073 afs_put_server(server); 1074create_error: 1075 key_put(key); 1076error: 1077 d_drop(dentry); 1078 _leave(" = %d", ret); 1079 return ret; 1080} 1081 1082/* 1083 * rename a file in an AFS filesystem and/or move it between directories 1084 */ 1085static int afs_rename(struct inode *old_dir, struct dentry *old_dentry, 1086 struct inode *new_dir, struct dentry *new_dentry) 1087{ 1088 struct afs_vnode *orig_dvnode, *new_dvnode, *vnode; 1089 struct key *key; 1090 int ret; 1091 1092 vnode = AFS_FS_I(d_inode(old_dentry)); 1093 orig_dvnode = AFS_FS_I(old_dir); 1094 new_dvnode = AFS_FS_I(new_dir); 1095 1096 _enter("{%x:%u},{%x:%u},{%x:%u},{%pd}", 1097 orig_dvnode->fid.vid, orig_dvnode->fid.vnode, 1098 vnode->fid.vid, vnode->fid.vnode, 1099 new_dvnode->fid.vid, new_dvnode->fid.vnode, 1100 new_dentry); 1101 1102 key = afs_request_key(orig_dvnode->volume->cell); 1103 if (IS_ERR(key)) { 1104 ret = PTR_ERR(key); 1105 goto error; 1106 } 1107 1108 ret = afs_vnode_rename(orig_dvnode, new_dvnode, key, 1109 old_dentry->d_name.name, 1110 new_dentry->d_name.name); 1111 if (ret < 0) 1112 goto rename_error; 1113 key_put(key); 1114 _leave(" = 0"); 1115 return 0; 1116 1117rename_error: 1118 key_put(key); 1119error: 1120 d_drop(new_dentry); 1121 _leave(" = %d", ret); 1122 return ret; 1123} 1124