1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * namei.c 4 * 5 * PURPOSE 6 * Inode name handling routines for the OSTA-UDF(tm) filesystem. 7 * 8 * COPYRIGHT 9 * (C) 1998-2004 Ben Fennema 10 * (C) 1999-2000 Stelias Computing Inc 11 * 12 * HISTORY 13 * 14 * 12/12/98 blf Created. Split out the lookup code from dir.c 15 * 04/19/99 blf link, mknod, symlink support 16 */ 17 18 #include "udfdecl.h" 19 20 #include "udf_i.h" 21 #include "udf_sb.h" 22 #include <linux/string.h> 23 #include <linux/errno.h> 24 #include <linux/mm.h> 25 #include <linux/slab.h> 26 #include <linux/sched.h> 27 #include <linux/crc-itu-t.h> 28 #include <linux/exportfs.h> 29 #include <linux/iversion.h> 30 31 static inline int udf_match(int len1, const unsigned char *name1, int len2, 32 const unsigned char *name2) 33 { 34 if (len1 != len2) 35 return 0; 36 37 return !memcmp(name1, name2, len1); 38 } 39 40 /** 41 * udf_fiiter_find_entry - find entry in given directory. 42 * 43 * @dir: directory inode to search in 44 * @child: qstr of the name 45 * @iter: iter to use for searching 46 * 47 * This function searches in the directory @dir for a file name @child. When 48 * found, @iter points to the position in the directory with given entry. 49 * 50 * Returns 0 on success, < 0 on error (including -ENOENT). 51 */ 52 static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child, 53 struct udf_fileident_iter *iter) 54 { 55 int flen; 56 unsigned char *fname = NULL; 57 struct super_block *sb = dir->i_sb; 58 int isdotdot = child->len == 2 && 59 child->name[0] == '.' && child->name[1] == '.'; 60 int ret; 61 62 fname = kmalloc(UDF_NAME_LEN, GFP_KERNEL); 63 if (!fname) 64 return -ENOMEM; 65 66 for (ret = udf_fiiter_init(iter, dir, 0); 67 !ret && iter->pos < dir->i_size; 68 ret = udf_fiiter_advance(iter)) { 69 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 70 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 71 continue; 72 } 73 74 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) { 75 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 76 continue; 77 } 78 79 if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) && 80 isdotdot) 81 goto out_ok; 82 83 if (!iter->fi.lengthFileIdent) 84 continue; 85 86 flen = udf_get_filename(sb, iter->name, 87 iter->fi.lengthFileIdent, fname, UDF_NAME_LEN); 88 if (flen < 0) { 89 ret = flen; 90 goto out_err; 91 } 92 93 if (udf_match(flen, fname, child->len, child->name)) 94 goto out_ok; 95 } 96 if (!ret) 97 ret = -ENOENT; 98 99 out_err: 100 udf_fiiter_release(iter); 101 out_ok: 102 kfree(fname); 103 104 return ret; 105 } 106 107 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 108 unsigned int flags) 109 { 110 struct inode *inode = NULL; 111 struct udf_fileident_iter iter; 112 int err; 113 114 if (dentry->d_name.len > UDF_NAME_LEN) 115 return ERR_PTR(-ENAMETOOLONG); 116 117 err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 118 if (err < 0 && err != -ENOENT) 119 return ERR_PTR(err); 120 121 if (err == 0) { 122 struct kernel_lb_addr loc; 123 124 loc = lelb_to_cpu(iter.fi.icb.extLocation); 125 udf_fiiter_release(&iter); 126 127 inode = udf_iget(dir->i_sb, &loc); 128 } 129 130 return d_splice_alias(inode, dentry); 131 } 132 133 static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block) 134 { 135 udf_pblk_t newblock; 136 struct buffer_head *dbh = NULL; 137 struct kernel_lb_addr eloc; 138 struct extent_position epos; 139 uint8_t alloctype; 140 struct udf_inode_info *iinfo = UDF_I(inode); 141 struct udf_fileident_iter iter; 142 uint8_t *impuse; 143 int ret; 144 145 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 146 alloctype = ICBTAG_FLAG_AD_SHORT; 147 else 148 alloctype = ICBTAG_FLAG_AD_LONG; 149 150 if (!inode->i_size) { 151 iinfo->i_alloc_type = alloctype; 152 mark_inode_dirty(inode); 153 return 0; 154 } 155 156 /* alloc block, and copy data to it */ 157 *block = udf_new_block(inode->i_sb, inode, 158 iinfo->i_location.partitionReferenceNum, 159 iinfo->i_location.logicalBlockNum, &ret); 160 if (!(*block)) 161 return ret; 162 newblock = udf_get_pblock(inode->i_sb, *block, 163 iinfo->i_location.partitionReferenceNum, 164 0); 165 if (newblock == 0xffffffff) 166 return -EFSCORRUPTED; 167 dbh = sb_getblk(inode->i_sb, newblock); 168 if (!dbh) 169 return -ENOMEM; 170 lock_buffer(dbh); 171 memcpy(dbh->b_data, iinfo->i_data, inode->i_size); 172 memset(dbh->b_data + inode->i_size, 0, 173 inode->i_sb->s_blocksize - inode->i_size); 174 set_buffer_uptodate(dbh); 175 unlock_buffer(dbh); 176 177 /* Drop inline data, add block instead */ 178 iinfo->i_alloc_type = alloctype; 179 memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc); 180 iinfo->i_lenAlloc = 0; 181 eloc.logicalBlockNum = *block; 182 eloc.partitionReferenceNum = 183 iinfo->i_location.partitionReferenceNum; 184 iinfo->i_lenExtents = inode->i_size; 185 epos.bh = NULL; 186 epos.block = iinfo->i_location; 187 epos.offset = udf_file_entry_alloc_offset(inode); 188 ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); 189 brelse(epos.bh); 190 if (ret < 0) { 191 brelse(dbh); 192 udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1); 193 return ret; 194 } 195 mark_inode_dirty(inode); 196 197 /* Now fixup tags in moved directory entries */ 198 for (ret = udf_fiiter_init(&iter, inode, 0); 199 !ret && iter.pos < inode->i_size; 200 ret = udf_fiiter_advance(&iter)) { 201 iter.fi.descTag.tagLocation = cpu_to_le32(*block); 202 if (iter.fi.lengthOfImpUse != cpu_to_le16(0)) 203 impuse = dbh->b_data + iter.pos + 204 sizeof(struct fileIdentDesc); 205 else 206 impuse = NULL; 207 udf_fiiter_write_fi(&iter, impuse); 208 } 209 brelse(dbh); 210 /* 211 * We don't expect the iteration to fail as the directory has been 212 * already verified to be correct 213 */ 214 WARN_ON_ONCE(ret); 215 udf_fiiter_release(&iter); 216 217 return 0; 218 } 219 220 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry, 221 struct udf_fileident_iter *iter) 222 { 223 struct udf_inode_info *dinfo = UDF_I(dir); 224 int nfidlen, namelen = 0; 225 int ret; 226 int off, blksize = 1 << dir->i_blkbits; 227 udf_pblk_t block; 228 char name[UDF_NAME_LEN_CS0]; 229 230 if (dentry) { 231 namelen = udf_put_filename(dir->i_sb, dentry->d_name.name, 232 dentry->d_name.len, 233 name, UDF_NAME_LEN_CS0); 234 if (!namelen) 235 return -ENAMETOOLONG; 236 } 237 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 238 239 for (ret = udf_fiiter_init(iter, dir, 0); 240 !ret && iter->pos < dir->i_size; 241 ret = udf_fiiter_advance(iter)) { 242 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 243 if (udf_dir_entry_len(&iter->fi) == nfidlen) { 244 iter->fi.descTag.tagSerialNum = cpu_to_le16(1); 245 iter->fi.fileVersionNum = cpu_to_le16(1); 246 iter->fi.fileCharacteristics = 0; 247 iter->fi.lengthFileIdent = namelen; 248 iter->fi.lengthOfImpUse = cpu_to_le16(0); 249 memcpy(iter->namebuf, name, namelen); 250 iter->name = iter->namebuf; 251 return 0; 252 } 253 } 254 } 255 if (ret) { 256 udf_fiiter_release(iter); 257 return ret; 258 } 259 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 260 blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) { 261 udf_fiiter_release(iter); 262 ret = udf_expand_dir_adinicb(dir, &block); 263 if (ret) 264 return ret; 265 ret = udf_fiiter_init(iter, dir, dir->i_size); 266 if (ret < 0) 267 return ret; 268 } 269 270 /* Get blocknumber to use for entry tag */ 271 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 272 block = dinfo->i_location.logicalBlockNum; 273 } else { 274 block = iter->eloc.logicalBlockNum + 275 ((iter->elen - 1) >> dir->i_blkbits); 276 } 277 off = iter->pos & (blksize - 1); 278 if (!off) 279 off = blksize; 280 /* Entry fits into current block? */ 281 if (blksize - udf_ext0_offset(dir) - off >= nfidlen) 282 goto store_fi; 283 284 ret = udf_fiiter_append_blk(iter); 285 if (ret) { 286 udf_fiiter_release(iter); 287 return ret; 288 } 289 290 /* Entry will be completely in the new block? Update tag location... */ 291 if (!(iter->pos & (blksize - 1))) 292 block = iter->eloc.logicalBlockNum + 293 ((iter->elen - 1) >> dir->i_blkbits); 294 store_fi: 295 memset(&iter->fi, 0, sizeof(struct fileIdentDesc)); 296 if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200) 297 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block, 298 sizeof(struct tag)); 299 else 300 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block, 301 sizeof(struct tag)); 302 iter->fi.fileVersionNum = cpu_to_le16(1); 303 iter->fi.lengthFileIdent = namelen; 304 iter->fi.lengthOfImpUse = cpu_to_le16(0); 305 memcpy(iter->namebuf, name, namelen); 306 iter->name = iter->namebuf; 307 308 dir->i_size += nfidlen; 309 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 310 dinfo->i_lenAlloc += nfidlen; 311 } else { 312 /* Truncate last extent to proper size */ 313 udf_fiiter_update_elen(iter, iter->elen - 314 (dinfo->i_lenExtents - dir->i_size)); 315 } 316 mark_inode_dirty(dir); 317 318 return 0; 319 } 320 321 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter) 322 { 323 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED; 324 325 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT)) 326 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad)); 327 328 udf_fiiter_write_fi(iter, NULL); 329 } 330 331 static void udf_add_fid_counter(struct super_block *sb, bool dir, int val) 332 { 333 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb); 334 335 if (!lvidiu) 336 return; 337 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 338 if (dir) 339 le32_add_cpu(&lvidiu->numDirs, val); 340 else 341 le32_add_cpu(&lvidiu->numFiles, val); 342 udf_updated_lvid(sb); 343 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 344 } 345 346 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 347 { 348 struct udf_inode_info *iinfo = UDF_I(inode); 349 struct inode *dir = d_inode(dentry->d_parent); 350 struct udf_fileident_iter iter; 351 int err; 352 353 err = udf_fiiter_add_entry(dir, dentry, &iter); 354 if (err) { 355 inode_dec_link_count(inode); 356 discard_new_inode(inode); 357 return err; 358 } 359 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 360 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 361 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 362 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 363 udf_fiiter_write_fi(&iter, NULL); 364 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 365 mark_inode_dirty(dir); 366 udf_fiiter_release(&iter); 367 udf_add_fid_counter(dir->i_sb, false, 1); 368 d_instantiate_new(dentry, inode); 369 370 return 0; 371 } 372 373 static int udf_create(struct mnt_idmap *idmap, struct inode *dir, 374 struct dentry *dentry, umode_t mode, bool excl) 375 { 376 struct inode *inode = udf_new_inode(dir, mode); 377 378 if (IS_ERR(inode)) 379 return PTR_ERR(inode); 380 381 inode->i_data.a_ops = &udf_aops; 382 inode->i_op = &udf_file_inode_operations; 383 inode->i_fop = &udf_file_operations; 384 mark_inode_dirty(inode); 385 386 return udf_add_nondir(dentry, inode); 387 } 388 389 static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir, 390 struct file *file, umode_t mode) 391 { 392 struct inode *inode = udf_new_inode(dir, mode); 393 394 if (IS_ERR(inode)) 395 return PTR_ERR(inode); 396 397 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 mnt_idmap *idmap, 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 mnt_idmap *idmap, 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 udf_add_fid_counter(dir->i_sb, true, 1); 469 inc_nlink(dir); 470 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 471 mark_inode_dirty(dir); 472 d_instantiate_new(dentry, inode); 473 474 return 0; 475 } 476 477 static int empty_dir(struct inode *dir) 478 { 479 struct udf_fileident_iter iter; 480 int ret; 481 482 for (ret = udf_fiiter_init(&iter, dir, 0); 483 !ret && iter.pos < dir->i_size; 484 ret = udf_fiiter_advance(&iter)) { 485 if (iter.fi.lengthFileIdent && 486 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 487 udf_fiiter_release(&iter); 488 return 0; 489 } 490 } 491 udf_fiiter_release(&iter); 492 493 return 1; 494 } 495 496 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 497 { 498 int ret; 499 struct inode *inode = d_inode(dentry); 500 struct udf_fileident_iter iter; 501 struct kernel_lb_addr tloc; 502 503 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 504 if (ret) 505 goto out; 506 507 ret = -EFSCORRUPTED; 508 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 509 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 510 goto end_rmdir; 511 ret = -ENOTEMPTY; 512 if (!empty_dir(inode)) 513 goto end_rmdir; 514 udf_fiiter_delete_entry(&iter); 515 if (inode->i_nlink != 2) 516 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 517 inode->i_nlink); 518 clear_nlink(inode); 519 inode->i_size = 0; 520 inode_dec_link_count(dir); 521 udf_add_fid_counter(dir->i_sb, true, -1); 522 inode_set_mtime_to_ts(dir, 523 inode_set_ctime_to_ts(dir, inode_set_ctime_current(inode))); 524 mark_inode_dirty(dir); 525 ret = 0; 526 end_rmdir: 527 udf_fiiter_release(&iter); 528 out: 529 return ret; 530 } 531 532 static int udf_unlink(struct inode *dir, struct dentry *dentry) 533 { 534 int ret; 535 struct inode *inode = d_inode(dentry); 536 struct udf_fileident_iter iter; 537 struct kernel_lb_addr tloc; 538 539 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 540 if (ret) 541 goto out; 542 543 ret = -EFSCORRUPTED; 544 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 545 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 546 goto end_unlink; 547 548 if (!inode->i_nlink) { 549 udf_debug("Deleting nonexistent file (%lu), %u\n", 550 inode->i_ino, inode->i_nlink); 551 set_nlink(inode, 1); 552 } 553 udf_fiiter_delete_entry(&iter); 554 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 555 mark_inode_dirty(dir); 556 inode_dec_link_count(inode); 557 udf_add_fid_counter(dir->i_sb, false, -1); 558 inode_set_ctime_to_ts(inode, inode_get_ctime(dir)); 559 ret = 0; 560 end_unlink: 561 udf_fiiter_release(&iter); 562 out: 563 return ret; 564 } 565 566 static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir, 567 struct dentry *dentry, const char *symname) 568 { 569 struct inode *inode; 570 struct pathComponent *pc; 571 const char *compstart; 572 struct extent_position epos = {}; 573 int eoffset, elen = 0; 574 uint8_t *ea; 575 int err; 576 udf_pblk_t block; 577 unsigned char *name = NULL; 578 int namelen; 579 struct udf_inode_info *iinfo; 580 struct super_block *sb = dir->i_sb; 581 582 name = kmalloc(UDF_NAME_LEN_CS0, GFP_KERNEL); 583 if (!name) { 584 err = -ENOMEM; 585 goto out; 586 } 587 588 inode = udf_new_inode(dir, S_IFLNK | 0777); 589 if (IS_ERR(inode)) { 590 err = PTR_ERR(inode); 591 goto out; 592 } 593 594 iinfo = UDF_I(inode); 595 down_write(&iinfo->i_data_sem); 596 inode->i_data.a_ops = &udf_symlink_aops; 597 inode->i_op = &udf_symlink_inode_operations; 598 inode_nohighmem(inode); 599 600 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 601 struct kernel_lb_addr eloc; 602 uint32_t bsize; 603 604 block = udf_new_block(sb, inode, 605 iinfo->i_location.partitionReferenceNum, 606 iinfo->i_location.logicalBlockNum, &err); 607 if (!block) 608 goto out_no_entry; 609 epos.block = iinfo->i_location; 610 epos.offset = udf_file_entry_alloc_offset(inode); 611 epos.bh = NULL; 612 eloc.logicalBlockNum = block; 613 eloc.partitionReferenceNum = 614 iinfo->i_location.partitionReferenceNum; 615 bsize = sb->s_blocksize; 616 iinfo->i_lenExtents = bsize; 617 err = udf_add_aext(inode, &epos, &eloc, bsize, 0); 618 brelse(epos.bh); 619 if (err < 0) { 620 udf_free_blocks(sb, inode, &eloc, 0, 1); 621 goto out_no_entry; 622 } 623 624 block = udf_get_pblock(sb, block, 625 iinfo->i_location.partitionReferenceNum, 626 0); 627 epos.bh = sb_getblk(sb, block); 628 if (unlikely(!epos.bh)) { 629 err = -ENOMEM; 630 udf_free_blocks(sb, inode, &eloc, 0, 1); 631 goto out_no_entry; 632 } 633 lock_buffer(epos.bh); 634 memset(epos.bh->b_data, 0x00, bsize); 635 set_buffer_uptodate(epos.bh); 636 unlock_buffer(epos.bh); 637 mark_buffer_dirty_inode(epos.bh, inode); 638 ea = epos.bh->b_data + udf_ext0_offset(inode); 639 } else 640 ea = iinfo->i_data + iinfo->i_lenEAttr; 641 642 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 643 pc = (struct pathComponent *)ea; 644 645 if (*symname == '/') { 646 do { 647 symname++; 648 } while (*symname == '/'); 649 650 pc->componentType = 1; 651 pc->lengthComponentIdent = 0; 652 pc->componentFileVersionNum = 0; 653 elen += sizeof(struct pathComponent); 654 } 655 656 err = -ENAMETOOLONG; 657 658 while (*symname) { 659 if (elen + sizeof(struct pathComponent) > eoffset) 660 goto out_no_entry; 661 662 pc = (struct pathComponent *)(ea + elen); 663 664 compstart = symname; 665 666 do { 667 symname++; 668 } while (*symname && *symname != '/'); 669 670 pc->componentType = 5; 671 pc->lengthComponentIdent = 0; 672 pc->componentFileVersionNum = 0; 673 if (compstart[0] == '.') { 674 if ((symname - compstart) == 1) 675 pc->componentType = 4; 676 else if ((symname - compstart) == 2 && 677 compstart[1] == '.') 678 pc->componentType = 3; 679 } 680 681 if (pc->componentType == 5) { 682 namelen = udf_put_filename(sb, compstart, 683 symname - compstart, 684 name, UDF_NAME_LEN_CS0); 685 if (!namelen) 686 goto out_no_entry; 687 688 if (elen + sizeof(struct pathComponent) + namelen > 689 eoffset) 690 goto out_no_entry; 691 else 692 pc->lengthComponentIdent = namelen; 693 694 memcpy(pc->componentIdent, name, namelen); 695 } 696 697 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 698 699 if (*symname) { 700 do { 701 symname++; 702 } while (*symname == '/'); 703 } 704 } 705 706 brelse(epos.bh); 707 inode->i_size = elen; 708 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 709 iinfo->i_lenAlloc = inode->i_size; 710 else 711 udf_truncate_tail_extent(inode); 712 mark_inode_dirty(inode); 713 up_write(&iinfo->i_data_sem); 714 715 err = udf_add_nondir(dentry, inode); 716 out: 717 kfree(name); 718 return err; 719 720 out_no_entry: 721 up_write(&iinfo->i_data_sem); 722 inode_dec_link_count(inode); 723 discard_new_inode(inode); 724 goto out; 725 } 726 727 static int udf_link(struct dentry *old_dentry, struct inode *dir, 728 struct dentry *dentry) 729 { 730 struct inode *inode = d_inode(old_dentry); 731 struct udf_fileident_iter iter; 732 int err; 733 734 err = udf_fiiter_add_entry(dir, dentry, &iter); 735 if (err) 736 return err; 737 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 738 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 739 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 740 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 741 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 742 } 743 udf_fiiter_write_fi(&iter, NULL); 744 udf_fiiter_release(&iter); 745 746 inc_nlink(inode); 747 udf_add_fid_counter(dir->i_sb, false, 1); 748 inode_set_ctime_current(inode); 749 mark_inode_dirty(inode); 750 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 751 mark_inode_dirty(dir); 752 ihold(inode); 753 d_instantiate(dentry, inode); 754 755 return 0; 756 } 757 758 /* Anybody can rename anything with this: the permission checks are left to the 759 * higher-level routines. 760 */ 761 static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, 762 struct dentry *old_dentry, struct inode *new_dir, 763 struct dentry *new_dentry, unsigned int flags) 764 { 765 struct inode *old_inode = d_inode(old_dentry); 766 struct inode *new_inode = d_inode(new_dentry); 767 struct udf_fileident_iter oiter, niter, diriter; 768 bool has_diriter = false, is_dir = false; 769 int retval; 770 struct kernel_lb_addr tloc; 771 772 if (flags & ~RENAME_NOREPLACE) 773 return -EINVAL; 774 775 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 776 if (retval) 777 return retval; 778 779 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 780 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 781 retval = -ENOENT; 782 goto out_oiter; 783 } 784 785 if (S_ISDIR(old_inode->i_mode)) { 786 if (new_inode) { 787 retval = -ENOTEMPTY; 788 if (!empty_dir(new_inode)) 789 goto out_oiter; 790 } 791 is_dir = true; 792 } 793 if (is_dir && old_dir != new_dir) { 794 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 795 &diriter); 796 if (retval == -ENOENT) { 797 udf_err(old_inode->i_sb, 798 "directory (ino %lu) has no '..' entry\n", 799 old_inode->i_ino); 800 retval = -EFSCORRUPTED; 801 } 802 if (retval) 803 goto out_oiter; 804 has_diriter = true; 805 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 806 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 807 old_dir->i_ino) { 808 retval = -EFSCORRUPTED; 809 udf_err(old_inode->i_sb, 810 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 811 old_inode->i_ino, old_dir->i_ino, 812 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 813 goto out_oiter; 814 } 815 } 816 817 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 818 if (retval && retval != -ENOENT) 819 goto out_oiter; 820 /* Entry found but not passed by VFS? */ 821 if (!retval && !new_inode) { 822 retval = -EFSCORRUPTED; 823 udf_fiiter_release(&niter); 824 goto out_oiter; 825 } 826 /* Entry not found? Need to add one... */ 827 if (retval) { 828 udf_fiiter_release(&niter); 829 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 830 if (retval) 831 goto out_oiter; 832 } 833 834 /* 835 * Like most other Unix systems, set the ctime for inodes on a 836 * rename. 837 */ 838 inode_set_ctime_current(old_inode); 839 mark_inode_dirty(old_inode); 840 841 /* 842 * ok, that's it 843 */ 844 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 845 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 846 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 847 udf_fiiter_write_fi(&niter, NULL); 848 udf_fiiter_release(&niter); 849 850 /* 851 * The old entry may have moved due to new entry allocation. Find it 852 * again. 853 */ 854 udf_fiiter_release(&oiter); 855 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 856 if (retval) { 857 udf_err(old_dir->i_sb, 858 "failed to find renamed entry again in directory (ino %lu)\n", 859 old_dir->i_ino); 860 } else { 861 udf_fiiter_delete_entry(&oiter); 862 udf_fiiter_release(&oiter); 863 } 864 865 if (new_inode) { 866 inode_set_ctime_current(new_inode); 867 inode_dec_link_count(new_inode); 868 udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode), 869 -1); 870 } 871 inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir)); 872 inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir)); 873 mark_inode_dirty(old_dir); 874 mark_inode_dirty(new_dir); 875 876 if (has_diriter) { 877 diriter.fi.icb.extLocation = 878 cpu_to_lelb(UDF_I(new_dir)->i_location); 879 udf_update_tag((char *)&diriter.fi, 880 udf_dir_entry_len(&diriter.fi)); 881 udf_fiiter_write_fi(&diriter, NULL); 882 udf_fiiter_release(&diriter); 883 } 884 885 if (is_dir) { 886 inode_dec_link_count(old_dir); 887 if (new_inode) 888 inode_dec_link_count(new_inode); 889 else { 890 inc_nlink(new_dir); 891 mark_inode_dirty(new_dir); 892 } 893 } 894 return 0; 895 out_oiter: 896 if (has_diriter) 897 udf_fiiter_release(&diriter); 898 udf_fiiter_release(&oiter); 899 900 return retval; 901 } 902 903 static struct dentry *udf_get_parent(struct dentry *child) 904 { 905 struct kernel_lb_addr tloc; 906 struct udf_fileident_iter iter; 907 int err; 908 909 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 910 if (err) 911 return ERR_PTR(err); 912 913 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 914 udf_fiiter_release(&iter); 915 return d_obtain_alias(udf_iget(child->d_sb, &tloc)); 916 } 917 918 919 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 920 u16 partref, __u32 generation) 921 { 922 struct inode *inode; 923 struct kernel_lb_addr loc; 924 925 if (block == 0) 926 return ERR_PTR(-ESTALE); 927 928 loc.logicalBlockNum = block; 929 loc.partitionReferenceNum = partref; 930 inode = udf_iget(sb, &loc); 931 932 if (IS_ERR(inode)) 933 return ERR_CAST(inode); 934 935 if (generation && inode->i_generation != generation) { 936 iput(inode); 937 return ERR_PTR(-ESTALE); 938 } 939 return d_obtain_alias(inode); 940 } 941 942 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 943 struct fid *fid, int fh_len, int fh_type) 944 { 945 if (fh_len < 3 || 946 (fh_type != FILEID_UDF_WITH_PARENT && 947 fh_type != FILEID_UDF_WITHOUT_PARENT)) 948 return NULL; 949 950 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 951 fid->udf.generation); 952 } 953 954 static struct dentry *udf_fh_to_parent(struct super_block *sb, 955 struct fid *fid, int fh_len, int fh_type) 956 { 957 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 958 return NULL; 959 960 return udf_nfs_get_inode(sb, fid->udf.parent_block, 961 fid->udf.parent_partref, 962 fid->udf.parent_generation); 963 } 964 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 965 struct inode *parent) 966 { 967 int len = *lenp; 968 struct kernel_lb_addr location = UDF_I(inode)->i_location; 969 struct fid *fid = (struct fid *)fh; 970 int type = FILEID_UDF_WITHOUT_PARENT; 971 972 if (parent && (len < 5)) { 973 *lenp = 5; 974 return FILEID_INVALID; 975 } else if (len < 3) { 976 *lenp = 3; 977 return FILEID_INVALID; 978 } 979 980 *lenp = 3; 981 fid->udf.block = location.logicalBlockNum; 982 fid->udf.partref = location.partitionReferenceNum; 983 fid->udf.parent_partref = 0; 984 fid->udf.generation = inode->i_generation; 985 986 if (parent) { 987 location = UDF_I(parent)->i_location; 988 fid->udf.parent_block = location.logicalBlockNum; 989 fid->udf.parent_partref = location.partitionReferenceNum; 990 fid->udf.parent_generation = inode->i_generation; 991 *lenp = 5; 992 type = FILEID_UDF_WITH_PARENT; 993 } 994 995 return type; 996 } 997 998 const struct export_operations udf_export_ops = { 999 .encode_fh = udf_encode_fh, 1000 .fh_to_dentry = udf_fh_to_dentry, 1001 .fh_to_parent = udf_fh_to_parent, 1002 .get_parent = udf_get_parent, 1003 }; 1004 1005 const struct inode_operations udf_dir_inode_operations = { 1006 .lookup = udf_lookup, 1007 .create = udf_create, 1008 .link = udf_link, 1009 .unlink = udf_unlink, 1010 .symlink = udf_symlink, 1011 .mkdir = udf_mkdir, 1012 .rmdir = udf_rmdir, 1013 .mknod = udf_mknod, 1014 .rename = udf_rename, 1015 .tmpfile = udf_tmpfile, 1016 }; 1017