1 /* 2 * namei.c 3 * 4 * PURPOSE 5 * Inode name handling routines for the OSTA-UDF(tm) filesystem. 6 * 7 * COPYRIGHT 8 * This file is distributed under the terms of the GNU General Public 9 * License (GPL). Copies of the GPL can be obtained from: 10 * ftp://prep.ai.mit.edu/pub/gnu/GPL 11 * Each contributing author retains all rights to their own work. 12 * 13 * (C) 1998-2004 Ben Fennema 14 * (C) 1999-2000 Stelias Computing Inc 15 * 16 * HISTORY 17 * 18 * 12/12/98 blf Created. Split out the lookup code from dir.c 19 * 04/19/99 blf link, mknod, symlink support 20 */ 21 22 #include "udfdecl.h" 23 24 #include "udf_i.h" 25 #include "udf_sb.h" 26 #include <linux/string.h> 27 #include <linux/errno.h> 28 #include <linux/mm.h> 29 #include <linux/slab.h> 30 #include <linux/sched.h> 31 #include <linux/crc-itu-t.h> 32 #include <linux/exportfs.h> 33 #include <linux/iversion.h> 34 35 static inline int udf_match(int len1, const unsigned char *name1, int len2, 36 const unsigned char *name2) 37 { 38 if (len1 != len2) 39 return 0; 40 41 return !memcmp(name1, name2, len1); 42 } 43 44 /** 45 * udf_fiiter_find_entry - find entry in given directory. 46 * 47 * @dir: directory inode to search in 48 * @child: qstr of the name 49 * @iter: iter to use for searching 50 * 51 * This function searches in the directory @dir for a file name @child. When 52 * found, @iter points to the position in the directory with given entry. 53 * 54 * Returns 0 on success, < 0 on error (including -ENOENT). 55 */ 56 static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child, 57 struct udf_fileident_iter *iter) 58 { 59 int flen; 60 unsigned char *fname = NULL; 61 struct super_block *sb = dir->i_sb; 62 int isdotdot = child->len == 2 && 63 child->name[0] == '.' && child->name[1] == '.'; 64 int ret; 65 66 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 67 if (!fname) 68 return -ENOMEM; 69 70 for (ret = udf_fiiter_init(iter, dir, 0); 71 !ret && iter->pos < dir->i_size; 72 ret = udf_fiiter_advance(iter)) { 73 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 74 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 75 continue; 76 } 77 78 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) { 79 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 80 continue; 81 } 82 83 if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) && 84 isdotdot) 85 goto out_ok; 86 87 if (!iter->fi.lengthFileIdent) 88 continue; 89 90 flen = udf_get_filename(sb, iter->name, 91 iter->fi.lengthFileIdent, fname, UDF_NAME_LEN); 92 if (flen < 0) { 93 ret = flen; 94 goto out_err; 95 } 96 97 if (udf_match(flen, fname, child->len, child->name)) 98 goto out_ok; 99 } 100 if (!ret) 101 ret = -ENOENT; 102 103 out_err: 104 udf_fiiter_release(iter); 105 out_ok: 106 kfree(fname); 107 108 return ret; 109 } 110 111 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 112 unsigned int flags) 113 { 114 struct inode *inode = NULL; 115 struct udf_fileident_iter iter; 116 int err; 117 118 if (dentry->d_name.len > UDF_NAME_LEN) 119 return ERR_PTR(-ENAMETOOLONG); 120 121 err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 122 if (err < 0 && err != -ENOENT) 123 return ERR_PTR(err); 124 125 if (err == 0) { 126 struct kernel_lb_addr loc; 127 128 loc = lelb_to_cpu(iter.fi.icb.extLocation); 129 udf_fiiter_release(&iter); 130 131 inode = udf_iget(dir->i_sb, &loc); 132 if (IS_ERR(inode)) 133 return ERR_CAST(inode); 134 } 135 136 return d_splice_alias(inode, dentry); 137 } 138 139 static struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, 140 udf_pblk_t *block, int *err) 141 { 142 udf_pblk_t newblock; 143 struct buffer_head *dbh = NULL; 144 struct kernel_lb_addr eloc; 145 struct extent_position epos; 146 uint8_t alloctype; 147 struct udf_inode_info *iinfo = UDF_I(inode); 148 struct udf_fileident_iter iter; 149 uint8_t *impuse; 150 int ret; 151 152 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 153 alloctype = ICBTAG_FLAG_AD_SHORT; 154 else 155 alloctype = ICBTAG_FLAG_AD_LONG; 156 157 if (!inode->i_size) { 158 iinfo->i_alloc_type = alloctype; 159 mark_inode_dirty(inode); 160 return NULL; 161 } 162 163 /* alloc block, and copy data to it */ 164 *block = udf_new_block(inode->i_sb, inode, 165 iinfo->i_location.partitionReferenceNum, 166 iinfo->i_location.logicalBlockNum, err); 167 if (!(*block)) 168 return NULL; 169 newblock = udf_get_pblock(inode->i_sb, *block, 170 iinfo->i_location.partitionReferenceNum, 171 0); 172 if (!newblock) 173 return NULL; 174 dbh = udf_tgetblk(inode->i_sb, newblock); 175 if (!dbh) 176 return NULL; 177 lock_buffer(dbh); 178 memcpy(dbh->b_data, iinfo->i_data, inode->i_size); 179 memset(dbh->b_data + inode->i_size, 0, 180 inode->i_sb->s_blocksize - inode->i_size); 181 set_buffer_uptodate(dbh); 182 unlock_buffer(dbh); 183 184 /* Drop inline data, add block instead */ 185 iinfo->i_alloc_type = alloctype; 186 memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc); 187 iinfo->i_lenAlloc = 0; 188 eloc.logicalBlockNum = *block; 189 eloc.partitionReferenceNum = 190 iinfo->i_location.partitionReferenceNum; 191 iinfo->i_lenExtents = inode->i_size; 192 epos.bh = NULL; 193 epos.block = iinfo->i_location; 194 epos.offset = udf_file_entry_alloc_offset(inode); 195 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); 196 brelse(epos.bh); 197 mark_inode_dirty(inode); 198 199 /* Now fixup tags in moved directory entries */ 200 for (ret = udf_fiiter_init(&iter, inode, 0); 201 !ret && iter.pos < inode->i_size; 202 ret = udf_fiiter_advance(&iter)) { 203 iter.fi.descTag.tagLocation = cpu_to_le32(*block); 204 if (iter.fi.lengthOfImpUse != cpu_to_le16(0)) 205 impuse = dbh->b_data + iter.pos + 206 sizeof(struct fileIdentDesc); 207 else 208 impuse = NULL; 209 udf_fiiter_write_fi(&iter, impuse); 210 } 211 /* 212 * We don't expect the iteration to fail as the directory has been 213 * already verified to be correct 214 */ 215 WARN_ON_ONCE(ret); 216 udf_fiiter_release(&iter); 217 218 return dbh; 219 } 220 221 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry, 222 struct udf_fileident_iter *iter) 223 { 224 struct udf_inode_info *dinfo = UDF_I(dir); 225 int nfidlen, namelen = 0; 226 int ret; 227 int off, blksize = 1 << dir->i_blkbits; 228 udf_pblk_t block; 229 char name[UDF_NAME_LEN_CS0]; 230 231 if (dentry) { 232 if (!dentry->d_name.len) 233 return -EINVAL; 234 namelen = udf_put_filename(dir->i_sb, dentry->d_name.name, 235 dentry->d_name.len, 236 name, UDF_NAME_LEN_CS0); 237 if (!namelen) 238 return -ENAMETOOLONG; 239 } 240 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 241 242 for (ret = udf_fiiter_init(iter, dir, 0); 243 !ret && iter->pos < dir->i_size; 244 ret = udf_fiiter_advance(iter)) { 245 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 246 if (udf_dir_entry_len(&iter->fi) == nfidlen) { 247 iter->fi.descTag.tagSerialNum = cpu_to_le16(1); 248 iter->fi.fileVersionNum = cpu_to_le16(1); 249 iter->fi.fileCharacteristics = 0; 250 iter->fi.lengthFileIdent = namelen; 251 iter->fi.lengthOfImpUse = cpu_to_le16(0); 252 memcpy(iter->namebuf, name, namelen); 253 iter->name = iter->namebuf; 254 return 0; 255 } 256 } 257 } 258 if (ret) { 259 udf_fiiter_release(iter); 260 return ret; 261 } 262 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 263 blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) { 264 struct buffer_head *retbh; 265 266 udf_fiiter_release(iter); 267 /* 268 * FIXME: udf_expand_dir_adinicb does not need to return bh 269 * once other users are gone 270 */ 271 retbh = udf_expand_dir_adinicb(dir, &block, &ret); 272 if (!retbh) 273 return ret; 274 brelse(retbh); 275 ret = udf_fiiter_init(iter, dir, dir->i_size); 276 if (ret < 0) 277 return ret; 278 } 279 280 /* Get blocknumber to use for entry tag */ 281 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 282 block = dinfo->i_location.logicalBlockNum; 283 } else { 284 block = iter->eloc.logicalBlockNum + 285 ((iter->elen - 1) >> dir->i_blkbits); 286 } 287 off = iter->pos & (blksize - 1); 288 if (!off) 289 off = blksize; 290 /* Entry fits into current block? */ 291 if (blksize - udf_ext0_offset(dir) - off >= nfidlen) 292 goto store_fi; 293 294 ret = udf_fiiter_append_blk(iter); 295 if (ret) { 296 udf_fiiter_release(iter); 297 return ret; 298 } 299 300 /* Entry will be completely in the new block? Update tag location... */ 301 if (!(iter->pos & (blksize - 1))) 302 block = iter->eloc.logicalBlockNum + 303 ((iter->elen - 1) >> dir->i_blkbits); 304 store_fi: 305 memset(&iter->fi, 0, sizeof(struct fileIdentDesc)); 306 if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200) 307 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block, 308 sizeof(struct tag)); 309 else 310 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block, 311 sizeof(struct tag)); 312 iter->fi.fileVersionNum = cpu_to_le16(1); 313 iter->fi.lengthFileIdent = namelen; 314 iter->fi.lengthOfImpUse = cpu_to_le16(0); 315 memcpy(iter->namebuf, name, namelen); 316 iter->name = iter->namebuf; 317 318 dir->i_size += nfidlen; 319 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 320 dinfo->i_lenAlloc += nfidlen; 321 } else { 322 /* Truncate last extent to proper size */ 323 udf_fiiter_update_elen(iter, iter->elen - 324 (dinfo->i_lenExtents - dir->i_size)); 325 } 326 mark_inode_dirty(dir); 327 328 return 0; 329 } 330 331 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter) 332 { 333 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED; 334 335 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT)) 336 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad)); 337 338 udf_fiiter_write_fi(iter, NULL); 339 } 340 341 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 342 { 343 struct udf_inode_info *iinfo = UDF_I(inode); 344 struct inode *dir = d_inode(dentry->d_parent); 345 struct udf_fileident_iter iter; 346 int err; 347 348 err = udf_fiiter_add_entry(dir, dentry, &iter); 349 if (err) { 350 inode_dec_link_count(inode); 351 discard_new_inode(inode); 352 return err; 353 } 354 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 355 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 356 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 357 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 358 udf_fiiter_write_fi(&iter, NULL); 359 dir->i_ctime = dir->i_mtime = current_time(dir); 360 mark_inode_dirty(dir); 361 udf_fiiter_release(&iter); 362 d_instantiate_new(dentry, inode); 363 364 return 0; 365 } 366 367 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 368 struct dentry *dentry, umode_t mode, bool excl) 369 { 370 struct inode *inode = udf_new_inode(dir, mode); 371 372 if (IS_ERR(inode)) 373 return PTR_ERR(inode); 374 375 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 376 inode->i_data.a_ops = &udf_adinicb_aops; 377 else 378 inode->i_data.a_ops = &udf_aops; 379 inode->i_op = &udf_file_inode_operations; 380 inode->i_fop = &udf_file_operations; 381 mark_inode_dirty(inode); 382 383 return udf_add_nondir(dentry, inode); 384 } 385 386 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 387 struct file *file, umode_t mode) 388 { 389 struct inode *inode = udf_new_inode(dir, mode); 390 391 if (IS_ERR(inode)) 392 return PTR_ERR(inode); 393 394 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 395 inode->i_data.a_ops = &udf_adinicb_aops; 396 else 397 inode->i_data.a_ops = &udf_aops; 398 inode->i_op = &udf_file_inode_operations; 399 inode->i_fop = &udf_file_operations; 400 mark_inode_dirty(inode); 401 d_tmpfile(file, inode); 402 unlock_new_inode(inode); 403 return finish_open_simple(file, 0); 404 } 405 406 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 407 struct dentry *dentry, umode_t mode, dev_t rdev) 408 { 409 struct inode *inode; 410 411 if (!old_valid_dev(rdev)) 412 return -EINVAL; 413 414 inode = udf_new_inode(dir, mode); 415 if (IS_ERR(inode)) 416 return PTR_ERR(inode); 417 418 init_special_inode(inode, mode, rdev); 419 return udf_add_nondir(dentry, inode); 420 } 421 422 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 423 struct dentry *dentry, umode_t mode) 424 { 425 struct inode *inode; 426 struct udf_fileident_iter iter; 427 int err; 428 struct udf_inode_info *dinfo = UDF_I(dir); 429 struct udf_inode_info *iinfo; 430 431 inode = udf_new_inode(dir, S_IFDIR | mode); 432 if (IS_ERR(inode)) 433 return PTR_ERR(inode); 434 435 iinfo = UDF_I(inode); 436 inode->i_op = &udf_dir_inode_operations; 437 inode->i_fop = &udf_dir_operations; 438 err = udf_fiiter_add_entry(inode, NULL, &iter); 439 if (err) { 440 clear_nlink(inode); 441 discard_new_inode(inode); 442 return err; 443 } 444 set_nlink(inode, 2); 445 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 446 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 447 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 448 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 449 iter.fi.fileCharacteristics = 450 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 451 udf_fiiter_write_fi(&iter, NULL); 452 udf_fiiter_release(&iter); 453 mark_inode_dirty(inode); 454 455 err = udf_fiiter_add_entry(dir, dentry, &iter); 456 if (err) { 457 clear_nlink(inode); 458 discard_new_inode(inode); 459 return err; 460 } 461 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 462 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 463 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 464 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 465 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 466 udf_fiiter_write_fi(&iter, NULL); 467 udf_fiiter_release(&iter); 468 inc_nlink(dir); 469 dir->i_ctime = dir->i_mtime = current_time(dir); 470 mark_inode_dirty(dir); 471 d_instantiate_new(dentry, inode); 472 473 return 0; 474 } 475 476 static int empty_dir(struct inode *dir) 477 { 478 struct udf_fileident_iter iter; 479 int ret; 480 481 for (ret = udf_fiiter_init(&iter, dir, 0); 482 !ret && iter.pos < dir->i_size; 483 ret = udf_fiiter_advance(&iter)) { 484 if (iter.fi.lengthFileIdent && 485 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 486 udf_fiiter_release(&iter); 487 return 0; 488 } 489 } 490 udf_fiiter_release(&iter); 491 492 return 1; 493 } 494 495 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 496 { 497 int ret; 498 struct inode *inode = d_inode(dentry); 499 struct udf_fileident_iter iter; 500 struct kernel_lb_addr tloc; 501 502 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 503 if (ret) 504 goto out; 505 506 ret = -EFSCORRUPTED; 507 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 508 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 509 goto end_rmdir; 510 ret = -ENOTEMPTY; 511 if (!empty_dir(inode)) 512 goto end_rmdir; 513 udf_fiiter_delete_entry(&iter); 514 if (inode->i_nlink != 2) 515 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 516 inode->i_nlink); 517 clear_nlink(inode); 518 inode->i_size = 0; 519 inode_dec_link_count(dir); 520 inode->i_ctime = dir->i_ctime = dir->i_mtime = 521 current_time(inode); 522 mark_inode_dirty(dir); 523 ret = 0; 524 end_rmdir: 525 udf_fiiter_release(&iter); 526 out: 527 return ret; 528 } 529 530 static int udf_unlink(struct inode *dir, struct dentry *dentry) 531 { 532 int ret; 533 struct inode *inode = d_inode(dentry); 534 struct udf_fileident_iter iter; 535 struct kernel_lb_addr tloc; 536 537 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 538 if (ret) 539 goto out; 540 541 ret = -EFSCORRUPTED; 542 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 543 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 544 goto end_unlink; 545 546 if (!inode->i_nlink) { 547 udf_debug("Deleting nonexistent file (%lu), %u\n", 548 inode->i_ino, inode->i_nlink); 549 set_nlink(inode, 1); 550 } 551 udf_fiiter_delete_entry(&iter); 552 dir->i_ctime = dir->i_mtime = current_time(dir); 553 mark_inode_dirty(dir); 554 inode_dec_link_count(inode); 555 inode->i_ctime = dir->i_ctime; 556 ret = 0; 557 end_unlink: 558 udf_fiiter_release(&iter); 559 out: 560 return ret; 561 } 562 563 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 564 struct dentry *dentry, const char *symname) 565 { 566 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 567 struct pathComponent *pc; 568 const char *compstart; 569 struct extent_position epos = {}; 570 int eoffset, elen = 0; 571 uint8_t *ea; 572 int err; 573 udf_pblk_t block; 574 unsigned char *name = NULL; 575 int namelen; 576 struct udf_inode_info *iinfo; 577 struct super_block *sb = dir->i_sb; 578 579 if (IS_ERR(inode)) 580 return PTR_ERR(inode); 581 582 iinfo = UDF_I(inode); 583 down_write(&iinfo->i_data_sem); 584 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 585 if (!name) { 586 err = -ENOMEM; 587 goto out_no_entry; 588 } 589 590 inode->i_data.a_ops = &udf_symlink_aops; 591 inode->i_op = &udf_symlink_inode_operations; 592 inode_nohighmem(inode); 593 594 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 595 struct kernel_lb_addr eloc; 596 uint32_t bsize; 597 598 block = udf_new_block(sb, inode, 599 iinfo->i_location.partitionReferenceNum, 600 iinfo->i_location.logicalBlockNum, &err); 601 if (!block) 602 goto out_no_entry; 603 epos.block = iinfo->i_location; 604 epos.offset = udf_file_entry_alloc_offset(inode); 605 epos.bh = NULL; 606 eloc.logicalBlockNum = block; 607 eloc.partitionReferenceNum = 608 iinfo->i_location.partitionReferenceNum; 609 bsize = sb->s_blocksize; 610 iinfo->i_lenExtents = bsize; 611 udf_add_aext(inode, &epos, &eloc, bsize, 0); 612 brelse(epos.bh); 613 614 block = udf_get_pblock(sb, block, 615 iinfo->i_location.partitionReferenceNum, 616 0); 617 epos.bh = udf_tgetblk(sb, block); 618 if (unlikely(!epos.bh)) { 619 err = -ENOMEM; 620 goto out_no_entry; 621 } 622 lock_buffer(epos.bh); 623 memset(epos.bh->b_data, 0x00, bsize); 624 set_buffer_uptodate(epos.bh); 625 unlock_buffer(epos.bh); 626 mark_buffer_dirty_inode(epos.bh, inode); 627 ea = epos.bh->b_data + udf_ext0_offset(inode); 628 } else 629 ea = iinfo->i_data + iinfo->i_lenEAttr; 630 631 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 632 pc = (struct pathComponent *)ea; 633 634 if (*symname == '/') { 635 do { 636 symname++; 637 } while (*symname == '/'); 638 639 pc->componentType = 1; 640 pc->lengthComponentIdent = 0; 641 pc->componentFileVersionNum = 0; 642 elen += sizeof(struct pathComponent); 643 } 644 645 err = -ENAMETOOLONG; 646 647 while (*symname) { 648 if (elen + sizeof(struct pathComponent) > eoffset) 649 goto out_no_entry; 650 651 pc = (struct pathComponent *)(ea + elen); 652 653 compstart = symname; 654 655 do { 656 symname++; 657 } while (*symname && *symname != '/'); 658 659 pc->componentType = 5; 660 pc->lengthComponentIdent = 0; 661 pc->componentFileVersionNum = 0; 662 if (compstart[0] == '.') { 663 if ((symname - compstart) == 1) 664 pc->componentType = 4; 665 else if ((symname - compstart) == 2 && 666 compstart[1] == '.') 667 pc->componentType = 3; 668 } 669 670 if (pc->componentType == 5) { 671 namelen = udf_put_filename(sb, compstart, 672 symname - compstart, 673 name, UDF_NAME_LEN_CS0); 674 if (!namelen) 675 goto out_no_entry; 676 677 if (elen + sizeof(struct pathComponent) + namelen > 678 eoffset) 679 goto out_no_entry; 680 else 681 pc->lengthComponentIdent = namelen; 682 683 memcpy(pc->componentIdent, name, namelen); 684 } 685 686 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 687 688 if (*symname) { 689 do { 690 symname++; 691 } while (*symname == '/'); 692 } 693 } 694 695 brelse(epos.bh); 696 inode->i_size = elen; 697 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 698 iinfo->i_lenAlloc = inode->i_size; 699 else 700 udf_truncate_tail_extent(inode); 701 mark_inode_dirty(inode); 702 up_write(&iinfo->i_data_sem); 703 704 err = udf_add_nondir(dentry, inode); 705 out: 706 kfree(name); 707 return err; 708 709 out_no_entry: 710 up_write(&iinfo->i_data_sem); 711 inode_dec_link_count(inode); 712 discard_new_inode(inode); 713 goto out; 714 } 715 716 static int udf_link(struct dentry *old_dentry, struct inode *dir, 717 struct dentry *dentry) 718 { 719 struct inode *inode = d_inode(old_dentry); 720 struct udf_fileident_iter iter; 721 int err; 722 723 err = udf_fiiter_add_entry(dir, dentry, &iter); 724 if (err) 725 return err; 726 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 727 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 728 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 729 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 730 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 731 } 732 udf_fiiter_write_fi(&iter, NULL); 733 udf_fiiter_release(&iter); 734 735 inc_nlink(inode); 736 inode->i_ctime = current_time(inode); 737 mark_inode_dirty(inode); 738 dir->i_ctime = dir->i_mtime = current_time(dir); 739 mark_inode_dirty(dir); 740 ihold(inode); 741 d_instantiate(dentry, inode); 742 743 return 0; 744 } 745 746 /* Anybody can rename anything with this: the permission checks are left to the 747 * higher-level routines. 748 */ 749 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 750 struct dentry *old_dentry, struct inode *new_dir, 751 struct dentry *new_dentry, unsigned int flags) 752 { 753 struct inode *old_inode = d_inode(old_dentry); 754 struct inode *new_inode = d_inode(new_dentry); 755 struct udf_fileident_iter oiter, niter, diriter; 756 bool has_diriter = false; 757 int retval; 758 struct kernel_lb_addr tloc; 759 760 if (flags & ~RENAME_NOREPLACE) 761 return -EINVAL; 762 763 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 764 if (retval) 765 return retval; 766 767 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 768 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 769 retval = -ENOENT; 770 goto out_oiter; 771 } 772 773 if (S_ISDIR(old_inode->i_mode)) { 774 if (new_inode) { 775 retval = -ENOTEMPTY; 776 if (!empty_dir(new_inode)) 777 goto out_oiter; 778 } 779 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 780 &diriter); 781 if (retval == -ENOENT) { 782 udf_err(old_inode->i_sb, 783 "directory (ino %lu) has no '..' entry\n", 784 old_inode->i_ino); 785 retval = -EFSCORRUPTED; 786 } 787 if (retval) 788 goto out_oiter; 789 has_diriter = true; 790 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 791 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 792 old_dir->i_ino) { 793 retval = -EFSCORRUPTED; 794 udf_err(old_inode->i_sb, 795 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 796 old_inode->i_ino, old_dir->i_ino, 797 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 798 goto out_oiter; 799 } 800 } 801 802 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 803 if (retval && retval != -ENOENT) 804 goto out_oiter; 805 /* Entry found but not passed by VFS? */ 806 if (!retval && !new_inode) { 807 retval = -EFSCORRUPTED; 808 udf_fiiter_release(&niter); 809 goto out_oiter; 810 } 811 /* Entry not found? Need to add one... */ 812 if (retval) { 813 udf_fiiter_release(&niter); 814 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 815 if (retval) 816 goto out_oiter; 817 } 818 819 /* 820 * Like most other Unix systems, set the ctime for inodes on a 821 * rename. 822 */ 823 old_inode->i_ctime = current_time(old_inode); 824 mark_inode_dirty(old_inode); 825 826 /* 827 * ok, that's it 828 */ 829 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 830 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 831 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 832 udf_fiiter_write_fi(&niter, NULL); 833 udf_fiiter_release(&niter); 834 835 /* 836 * The old entry may have moved due to new entry allocation. Find it 837 * again. 838 */ 839 udf_fiiter_release(&oiter); 840 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 841 if (retval) { 842 udf_err(old_dir->i_sb, 843 "failed to find renamed entry again in directory (ino %lu)\n", 844 old_dir->i_ino); 845 } else { 846 udf_fiiter_delete_entry(&oiter); 847 udf_fiiter_release(&oiter); 848 } 849 850 if (new_inode) { 851 new_inode->i_ctime = current_time(new_inode); 852 inode_dec_link_count(new_inode); 853 } 854 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 855 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 856 mark_inode_dirty(old_dir); 857 mark_inode_dirty(new_dir); 858 859 if (has_diriter) { 860 diriter.fi.icb.extLocation = 861 cpu_to_lelb(UDF_I(new_dir)->i_location); 862 udf_update_tag((char *)&diriter.fi, 863 udf_dir_entry_len(&diriter.fi)); 864 udf_fiiter_write_fi(&diriter, NULL); 865 udf_fiiter_release(&diriter); 866 867 inode_dec_link_count(old_dir); 868 if (new_inode) 869 inode_dec_link_count(new_inode); 870 else { 871 inc_nlink(new_dir); 872 mark_inode_dirty(new_dir); 873 } 874 } 875 return 0; 876 out_oiter: 877 if (has_diriter) 878 udf_fiiter_release(&diriter); 879 udf_fiiter_release(&oiter); 880 881 return retval; 882 } 883 884 static struct dentry *udf_get_parent(struct dentry *child) 885 { 886 struct kernel_lb_addr tloc; 887 struct inode *inode = NULL; 888 struct udf_fileident_iter iter; 889 int err; 890 891 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 892 if (err) 893 return ERR_PTR(err); 894 895 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 896 udf_fiiter_release(&iter); 897 inode = udf_iget(child->d_sb, &tloc); 898 if (IS_ERR(inode)) 899 return ERR_CAST(inode); 900 901 return d_obtain_alias(inode); 902 } 903 904 905 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 906 u16 partref, __u32 generation) 907 { 908 struct inode *inode; 909 struct kernel_lb_addr loc; 910 911 if (block == 0) 912 return ERR_PTR(-ESTALE); 913 914 loc.logicalBlockNum = block; 915 loc.partitionReferenceNum = partref; 916 inode = udf_iget(sb, &loc); 917 918 if (IS_ERR(inode)) 919 return ERR_CAST(inode); 920 921 if (generation && inode->i_generation != generation) { 922 iput(inode); 923 return ERR_PTR(-ESTALE); 924 } 925 return d_obtain_alias(inode); 926 } 927 928 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 929 struct fid *fid, int fh_len, int fh_type) 930 { 931 if (fh_len < 3 || 932 (fh_type != FILEID_UDF_WITH_PARENT && 933 fh_type != FILEID_UDF_WITHOUT_PARENT)) 934 return NULL; 935 936 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 937 fid->udf.generation); 938 } 939 940 static struct dentry *udf_fh_to_parent(struct super_block *sb, 941 struct fid *fid, int fh_len, int fh_type) 942 { 943 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 944 return NULL; 945 946 return udf_nfs_get_inode(sb, fid->udf.parent_block, 947 fid->udf.parent_partref, 948 fid->udf.parent_generation); 949 } 950 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 951 struct inode *parent) 952 { 953 int len = *lenp; 954 struct kernel_lb_addr location = UDF_I(inode)->i_location; 955 struct fid *fid = (struct fid *)fh; 956 int type = FILEID_UDF_WITHOUT_PARENT; 957 958 if (parent && (len < 5)) { 959 *lenp = 5; 960 return FILEID_INVALID; 961 } else if (len < 3) { 962 *lenp = 3; 963 return FILEID_INVALID; 964 } 965 966 *lenp = 3; 967 fid->udf.block = location.logicalBlockNum; 968 fid->udf.partref = location.partitionReferenceNum; 969 fid->udf.parent_partref = 0; 970 fid->udf.generation = inode->i_generation; 971 972 if (parent) { 973 location = UDF_I(parent)->i_location; 974 fid->udf.parent_block = location.logicalBlockNum; 975 fid->udf.parent_partref = location.partitionReferenceNum; 976 fid->udf.parent_generation = inode->i_generation; 977 *lenp = 5; 978 type = FILEID_UDF_WITH_PARENT; 979 } 980 981 return type; 982 } 983 984 const struct export_operations udf_export_ops = { 985 .encode_fh = udf_encode_fh, 986 .fh_to_dentry = udf_fh_to_dentry, 987 .fh_to_parent = udf_fh_to_parent, 988 .get_parent = udf_get_parent, 989 }; 990 991 const struct inode_operations udf_dir_inode_operations = { 992 .lookup = udf_lookup, 993 .create = udf_create, 994 .link = udf_link, 995 .unlink = udf_unlink, 996 .symlink = udf_symlink, 997 .mkdir = udf_mkdir, 998 .rmdir = udf_rmdir, 999 .mknod = udf_mknod, 1000 .rename = udf_rename, 1001 .tmpfile = udf_tmpfile, 1002 }; 1003