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_NOFS); 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 if (IS_ERR(inode)) 129 return ERR_CAST(inode); 130 } 131 132 return d_splice_alias(inode, dentry); 133 } 134 135 static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block) 136 { 137 udf_pblk_t newblock; 138 struct buffer_head *dbh = NULL; 139 struct kernel_lb_addr eloc; 140 struct extent_position epos; 141 uint8_t alloctype; 142 struct udf_inode_info *iinfo = UDF_I(inode); 143 struct udf_fileident_iter iter; 144 uint8_t *impuse; 145 int ret; 146 147 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 148 alloctype = ICBTAG_FLAG_AD_SHORT; 149 else 150 alloctype = ICBTAG_FLAG_AD_LONG; 151 152 if (!inode->i_size) { 153 iinfo->i_alloc_type = alloctype; 154 mark_inode_dirty(inode); 155 return 0; 156 } 157 158 /* alloc block, and copy data to it */ 159 *block = udf_new_block(inode->i_sb, inode, 160 iinfo->i_location.partitionReferenceNum, 161 iinfo->i_location.logicalBlockNum, &ret); 162 if (!(*block)) 163 return ret; 164 newblock = udf_get_pblock(inode->i_sb, *block, 165 iinfo->i_location.partitionReferenceNum, 166 0); 167 if (newblock == 0xffffffff) 168 return -EFSCORRUPTED; 169 dbh = sb_getblk(inode->i_sb, newblock); 170 if (!dbh) 171 return -ENOMEM; 172 lock_buffer(dbh); 173 memcpy(dbh->b_data, iinfo->i_data, inode->i_size); 174 memset(dbh->b_data + inode->i_size, 0, 175 inode->i_sb->s_blocksize - inode->i_size); 176 set_buffer_uptodate(dbh); 177 unlock_buffer(dbh); 178 179 /* Drop inline data, add block instead */ 180 iinfo->i_alloc_type = alloctype; 181 memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc); 182 iinfo->i_lenAlloc = 0; 183 eloc.logicalBlockNum = *block; 184 eloc.partitionReferenceNum = 185 iinfo->i_location.partitionReferenceNum; 186 iinfo->i_lenExtents = inode->i_size; 187 epos.bh = NULL; 188 epos.block = iinfo->i_location; 189 epos.offset = udf_file_entry_alloc_offset(inode); 190 ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); 191 brelse(epos.bh); 192 if (ret < 0) { 193 brelse(dbh); 194 udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1); 195 return ret; 196 } 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 brelse(dbh); 212 /* 213 * We don't expect the iteration to fail as the directory has been 214 * already verified to be correct 215 */ 216 WARN_ON_ONCE(ret); 217 udf_fiiter_release(&iter); 218 219 return 0; 220 } 221 222 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry, 223 struct udf_fileident_iter *iter) 224 { 225 struct udf_inode_info *dinfo = UDF_I(dir); 226 int nfidlen, namelen = 0; 227 int ret; 228 int off, blksize = 1 << dir->i_blkbits; 229 udf_pblk_t block; 230 char name[UDF_NAME_LEN_CS0]; 231 232 if (dentry) { 233 if (!dentry->d_name.len) 234 return -EINVAL; 235 namelen = udf_put_filename(dir->i_sb, dentry->d_name.name, 236 dentry->d_name.len, 237 name, UDF_NAME_LEN_CS0); 238 if (!namelen) 239 return -ENAMETOOLONG; 240 } 241 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 242 243 for (ret = udf_fiiter_init(iter, dir, 0); 244 !ret && iter->pos < dir->i_size; 245 ret = udf_fiiter_advance(iter)) { 246 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 247 if (udf_dir_entry_len(&iter->fi) == nfidlen) { 248 iter->fi.descTag.tagSerialNum = cpu_to_le16(1); 249 iter->fi.fileVersionNum = cpu_to_le16(1); 250 iter->fi.fileCharacteristics = 0; 251 iter->fi.lengthFileIdent = namelen; 252 iter->fi.lengthOfImpUse = cpu_to_le16(0); 253 memcpy(iter->namebuf, name, namelen); 254 iter->name = iter->namebuf; 255 return 0; 256 } 257 } 258 } 259 if (ret) { 260 udf_fiiter_release(iter); 261 return ret; 262 } 263 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 264 blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) { 265 udf_fiiter_release(iter); 266 ret = udf_expand_dir_adinicb(dir, &block); 267 if (ret) 268 return ret; 269 ret = udf_fiiter_init(iter, dir, dir->i_size); 270 if (ret < 0) 271 return ret; 272 } 273 274 /* Get blocknumber to use for entry tag */ 275 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 276 block = dinfo->i_location.logicalBlockNum; 277 } else { 278 block = iter->eloc.logicalBlockNum + 279 ((iter->elen - 1) >> dir->i_blkbits); 280 } 281 off = iter->pos & (blksize - 1); 282 if (!off) 283 off = blksize; 284 /* Entry fits into current block? */ 285 if (blksize - udf_ext0_offset(dir) - off >= nfidlen) 286 goto store_fi; 287 288 ret = udf_fiiter_append_blk(iter); 289 if (ret) { 290 udf_fiiter_release(iter); 291 return ret; 292 } 293 294 /* Entry will be completely in the new block? Update tag location... */ 295 if (!(iter->pos & (blksize - 1))) 296 block = iter->eloc.logicalBlockNum + 297 ((iter->elen - 1) >> dir->i_blkbits); 298 store_fi: 299 memset(&iter->fi, 0, sizeof(struct fileIdentDesc)); 300 if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200) 301 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block, 302 sizeof(struct tag)); 303 else 304 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block, 305 sizeof(struct tag)); 306 iter->fi.fileVersionNum = cpu_to_le16(1); 307 iter->fi.lengthFileIdent = namelen; 308 iter->fi.lengthOfImpUse = cpu_to_le16(0); 309 memcpy(iter->namebuf, name, namelen); 310 iter->name = iter->namebuf; 311 312 dir->i_size += nfidlen; 313 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 314 dinfo->i_lenAlloc += nfidlen; 315 } else { 316 /* Truncate last extent to proper size */ 317 udf_fiiter_update_elen(iter, iter->elen - 318 (dinfo->i_lenExtents - dir->i_size)); 319 } 320 mark_inode_dirty(dir); 321 322 return 0; 323 } 324 325 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter) 326 { 327 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED; 328 329 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT)) 330 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad)); 331 332 udf_fiiter_write_fi(iter, NULL); 333 } 334 335 static void udf_add_fid_counter(struct super_block *sb, bool dir, int val) 336 { 337 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb); 338 339 if (!lvidiu) 340 return; 341 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 342 if (dir) 343 le32_add_cpu(&lvidiu->numDirs, val); 344 else 345 le32_add_cpu(&lvidiu->numFiles, val); 346 udf_updated_lvid(sb); 347 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 348 } 349 350 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 351 { 352 struct udf_inode_info *iinfo = UDF_I(inode); 353 struct inode *dir = d_inode(dentry->d_parent); 354 struct udf_fileident_iter iter; 355 int err; 356 357 err = udf_fiiter_add_entry(dir, dentry, &iter); 358 if (err) { 359 inode_dec_link_count(inode); 360 discard_new_inode(inode); 361 return err; 362 } 363 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 364 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 365 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 366 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 367 udf_fiiter_write_fi(&iter, NULL); 368 dir->i_ctime = dir->i_mtime = current_time(dir); 369 mark_inode_dirty(dir); 370 udf_fiiter_release(&iter); 371 udf_add_fid_counter(dir->i_sb, false, 1); 372 d_instantiate_new(dentry, inode); 373 374 return 0; 375 } 376 377 static int udf_create(struct mnt_idmap *idmap, struct inode *dir, 378 struct dentry *dentry, umode_t mode, bool excl) 379 { 380 struct inode *inode = udf_new_inode(dir, mode); 381 382 if (IS_ERR(inode)) 383 return PTR_ERR(inode); 384 385 inode->i_data.a_ops = &udf_aops; 386 inode->i_op = &udf_file_inode_operations; 387 inode->i_fop = &udf_file_operations; 388 mark_inode_dirty(inode); 389 390 return udf_add_nondir(dentry, inode); 391 } 392 393 static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir, 394 struct file *file, umode_t mode) 395 { 396 struct inode *inode = udf_new_inode(dir, mode); 397 398 if (IS_ERR(inode)) 399 return PTR_ERR(inode); 400 401 inode->i_data.a_ops = &udf_aops; 402 inode->i_op = &udf_file_inode_operations; 403 inode->i_fop = &udf_file_operations; 404 mark_inode_dirty(inode); 405 d_tmpfile(file, inode); 406 unlock_new_inode(inode); 407 return finish_open_simple(file, 0); 408 } 409 410 static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir, 411 struct dentry *dentry, umode_t mode, dev_t rdev) 412 { 413 struct inode *inode; 414 415 if (!old_valid_dev(rdev)) 416 return -EINVAL; 417 418 inode = udf_new_inode(dir, mode); 419 if (IS_ERR(inode)) 420 return PTR_ERR(inode); 421 422 init_special_inode(inode, mode, rdev); 423 return udf_add_nondir(dentry, inode); 424 } 425 426 static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir, 427 struct dentry *dentry, umode_t mode) 428 { 429 struct inode *inode; 430 struct udf_fileident_iter iter; 431 int err; 432 struct udf_inode_info *dinfo = UDF_I(dir); 433 struct udf_inode_info *iinfo; 434 435 inode = udf_new_inode(dir, S_IFDIR | mode); 436 if (IS_ERR(inode)) 437 return PTR_ERR(inode); 438 439 iinfo = UDF_I(inode); 440 inode->i_op = &udf_dir_inode_operations; 441 inode->i_fop = &udf_dir_operations; 442 err = udf_fiiter_add_entry(inode, NULL, &iter); 443 if (err) { 444 clear_nlink(inode); 445 discard_new_inode(inode); 446 return err; 447 } 448 set_nlink(inode, 2); 449 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 450 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 451 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 452 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 453 iter.fi.fileCharacteristics = 454 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 455 udf_fiiter_write_fi(&iter, NULL); 456 udf_fiiter_release(&iter); 457 mark_inode_dirty(inode); 458 459 err = udf_fiiter_add_entry(dir, dentry, &iter); 460 if (err) { 461 clear_nlink(inode); 462 discard_new_inode(inode); 463 return err; 464 } 465 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 466 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 467 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 468 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 469 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 470 udf_fiiter_write_fi(&iter, NULL); 471 udf_fiiter_release(&iter); 472 udf_add_fid_counter(dir->i_sb, true, 1); 473 inc_nlink(dir); 474 dir->i_ctime = dir->i_mtime = current_time(dir); 475 mark_inode_dirty(dir); 476 d_instantiate_new(dentry, inode); 477 478 return 0; 479 } 480 481 static int empty_dir(struct inode *dir) 482 { 483 struct udf_fileident_iter iter; 484 int ret; 485 486 for (ret = udf_fiiter_init(&iter, dir, 0); 487 !ret && iter.pos < dir->i_size; 488 ret = udf_fiiter_advance(&iter)) { 489 if (iter.fi.lengthFileIdent && 490 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 491 udf_fiiter_release(&iter); 492 return 0; 493 } 494 } 495 udf_fiiter_release(&iter); 496 497 return 1; 498 } 499 500 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 501 { 502 int ret; 503 struct inode *inode = d_inode(dentry); 504 struct udf_fileident_iter iter; 505 struct kernel_lb_addr tloc; 506 507 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 508 if (ret) 509 goto out; 510 511 ret = -EFSCORRUPTED; 512 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 513 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 514 goto end_rmdir; 515 ret = -ENOTEMPTY; 516 if (!empty_dir(inode)) 517 goto end_rmdir; 518 udf_fiiter_delete_entry(&iter); 519 if (inode->i_nlink != 2) 520 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 521 inode->i_nlink); 522 clear_nlink(inode); 523 inode->i_size = 0; 524 inode_dec_link_count(dir); 525 udf_add_fid_counter(dir->i_sb, true, -1); 526 inode->i_ctime = dir->i_ctime = dir->i_mtime = 527 current_time(inode); 528 mark_inode_dirty(dir); 529 ret = 0; 530 end_rmdir: 531 udf_fiiter_release(&iter); 532 out: 533 return ret; 534 } 535 536 static int udf_unlink(struct inode *dir, struct dentry *dentry) 537 { 538 int ret; 539 struct inode *inode = d_inode(dentry); 540 struct udf_fileident_iter iter; 541 struct kernel_lb_addr tloc; 542 543 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 544 if (ret) 545 goto out; 546 547 ret = -EFSCORRUPTED; 548 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 549 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 550 goto end_unlink; 551 552 if (!inode->i_nlink) { 553 udf_debug("Deleting nonexistent file (%lu), %u\n", 554 inode->i_ino, inode->i_nlink); 555 set_nlink(inode, 1); 556 } 557 udf_fiiter_delete_entry(&iter); 558 dir->i_ctime = dir->i_mtime = current_time(dir); 559 mark_inode_dirty(dir); 560 inode_dec_link_count(inode); 561 udf_add_fid_counter(dir->i_sb, false, -1); 562 inode->i_ctime = dir->i_ctime; 563 ret = 0; 564 end_unlink: 565 udf_fiiter_release(&iter); 566 out: 567 return ret; 568 } 569 570 static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir, 571 struct dentry *dentry, const char *symname) 572 { 573 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 574 struct pathComponent *pc; 575 const char *compstart; 576 struct extent_position epos = {}; 577 int eoffset, elen = 0; 578 uint8_t *ea; 579 int err; 580 udf_pblk_t block; 581 unsigned char *name = NULL; 582 int namelen; 583 struct udf_inode_info *iinfo; 584 struct super_block *sb = dir->i_sb; 585 586 if (IS_ERR(inode)) 587 return PTR_ERR(inode); 588 589 iinfo = UDF_I(inode); 590 down_write(&iinfo->i_data_sem); 591 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 592 if (!name) { 593 err = -ENOMEM; 594 goto out_no_entry; 595 } 596 597 inode->i_data.a_ops = &udf_symlink_aops; 598 inode->i_op = &udf_symlink_inode_operations; 599 inode_nohighmem(inode); 600 601 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 602 struct kernel_lb_addr eloc; 603 uint32_t bsize; 604 605 block = udf_new_block(sb, inode, 606 iinfo->i_location.partitionReferenceNum, 607 iinfo->i_location.logicalBlockNum, &err); 608 if (!block) 609 goto out_no_entry; 610 epos.block = iinfo->i_location; 611 epos.offset = udf_file_entry_alloc_offset(inode); 612 epos.bh = NULL; 613 eloc.logicalBlockNum = block; 614 eloc.partitionReferenceNum = 615 iinfo->i_location.partitionReferenceNum; 616 bsize = sb->s_blocksize; 617 iinfo->i_lenExtents = bsize; 618 err = udf_add_aext(inode, &epos, &eloc, bsize, 0); 619 brelse(epos.bh); 620 if (err < 0) { 621 udf_free_blocks(sb, inode, &eloc, 0, 1); 622 goto out_no_entry; 623 } 624 625 block = udf_get_pblock(sb, block, 626 iinfo->i_location.partitionReferenceNum, 627 0); 628 epos.bh = sb_getblk(sb, block); 629 if (unlikely(!epos.bh)) { 630 err = -ENOMEM; 631 udf_free_blocks(sb, inode, &eloc, 0, 1); 632 goto out_no_entry; 633 } 634 lock_buffer(epos.bh); 635 memset(epos.bh->b_data, 0x00, bsize); 636 set_buffer_uptodate(epos.bh); 637 unlock_buffer(epos.bh); 638 mark_buffer_dirty_inode(epos.bh, inode); 639 ea = epos.bh->b_data + udf_ext0_offset(inode); 640 } else 641 ea = iinfo->i_data + iinfo->i_lenEAttr; 642 643 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 644 pc = (struct pathComponent *)ea; 645 646 if (*symname == '/') { 647 do { 648 symname++; 649 } while (*symname == '/'); 650 651 pc->componentType = 1; 652 pc->lengthComponentIdent = 0; 653 pc->componentFileVersionNum = 0; 654 elen += sizeof(struct pathComponent); 655 } 656 657 err = -ENAMETOOLONG; 658 659 while (*symname) { 660 if (elen + sizeof(struct pathComponent) > eoffset) 661 goto out_no_entry; 662 663 pc = (struct pathComponent *)(ea + elen); 664 665 compstart = symname; 666 667 do { 668 symname++; 669 } while (*symname && *symname != '/'); 670 671 pc->componentType = 5; 672 pc->lengthComponentIdent = 0; 673 pc->componentFileVersionNum = 0; 674 if (compstart[0] == '.') { 675 if ((symname - compstart) == 1) 676 pc->componentType = 4; 677 else if ((symname - compstart) == 2 && 678 compstart[1] == '.') 679 pc->componentType = 3; 680 } 681 682 if (pc->componentType == 5) { 683 namelen = udf_put_filename(sb, compstart, 684 symname - compstart, 685 name, UDF_NAME_LEN_CS0); 686 if (!namelen) 687 goto out_no_entry; 688 689 if (elen + sizeof(struct pathComponent) + namelen > 690 eoffset) 691 goto out_no_entry; 692 else 693 pc->lengthComponentIdent = namelen; 694 695 memcpy(pc->componentIdent, name, namelen); 696 } 697 698 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 699 700 if (*symname) { 701 do { 702 symname++; 703 } while (*symname == '/'); 704 } 705 } 706 707 brelse(epos.bh); 708 inode->i_size = elen; 709 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 710 iinfo->i_lenAlloc = inode->i_size; 711 else 712 udf_truncate_tail_extent(inode); 713 mark_inode_dirty(inode); 714 up_write(&iinfo->i_data_sem); 715 716 err = udf_add_nondir(dentry, inode); 717 out: 718 kfree(name); 719 return err; 720 721 out_no_entry: 722 up_write(&iinfo->i_data_sem); 723 inode_dec_link_count(inode); 724 discard_new_inode(inode); 725 goto out; 726 } 727 728 static int udf_link(struct dentry *old_dentry, struct inode *dir, 729 struct dentry *dentry) 730 { 731 struct inode *inode = d_inode(old_dentry); 732 struct udf_fileident_iter iter; 733 int err; 734 735 err = udf_fiiter_add_entry(dir, dentry, &iter); 736 if (err) 737 return err; 738 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 739 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 740 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 741 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 742 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 743 } 744 udf_fiiter_write_fi(&iter, NULL); 745 udf_fiiter_release(&iter); 746 747 inc_nlink(inode); 748 udf_add_fid_counter(dir->i_sb, false, 1); 749 inode->i_ctime = current_time(inode); 750 mark_inode_dirty(inode); 751 dir->i_ctime = dir->i_mtime = current_time(dir); 752 mark_inode_dirty(dir); 753 ihold(inode); 754 d_instantiate(dentry, inode); 755 756 return 0; 757 } 758 759 /* Anybody can rename anything with this: the permission checks are left to the 760 * higher-level routines. 761 */ 762 static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, 763 struct dentry *old_dentry, struct inode *new_dir, 764 struct dentry *new_dentry, unsigned int flags) 765 { 766 struct inode *old_inode = d_inode(old_dentry); 767 struct inode *new_inode = d_inode(new_dentry); 768 struct udf_fileident_iter oiter, niter, diriter; 769 bool has_diriter = false; 770 int retval; 771 struct kernel_lb_addr tloc; 772 773 if (flags & ~RENAME_NOREPLACE) 774 return -EINVAL; 775 776 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 777 if (retval) 778 return retval; 779 780 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 781 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 782 retval = -ENOENT; 783 goto out_oiter; 784 } 785 786 if (S_ISDIR(old_inode->i_mode)) { 787 if (new_inode) { 788 retval = -ENOTEMPTY; 789 if (!empty_dir(new_inode)) 790 goto out_oiter; 791 } 792 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 793 &diriter); 794 if (retval == -ENOENT) { 795 udf_err(old_inode->i_sb, 796 "directory (ino %lu) has no '..' entry\n", 797 old_inode->i_ino); 798 retval = -EFSCORRUPTED; 799 } 800 if (retval) 801 goto out_oiter; 802 has_diriter = true; 803 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 804 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 805 old_dir->i_ino) { 806 retval = -EFSCORRUPTED; 807 udf_err(old_inode->i_sb, 808 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 809 old_inode->i_ino, old_dir->i_ino, 810 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 811 goto out_oiter; 812 } 813 } 814 815 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 816 if (retval && retval != -ENOENT) 817 goto out_oiter; 818 /* Entry found but not passed by VFS? */ 819 if (!retval && !new_inode) { 820 retval = -EFSCORRUPTED; 821 udf_fiiter_release(&niter); 822 goto out_oiter; 823 } 824 /* Entry not found? Need to add one... */ 825 if (retval) { 826 udf_fiiter_release(&niter); 827 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 828 if (retval) 829 goto out_oiter; 830 } 831 832 /* 833 * Like most other Unix systems, set the ctime for inodes on a 834 * rename. 835 */ 836 old_inode->i_ctime = current_time(old_inode); 837 mark_inode_dirty(old_inode); 838 839 /* 840 * ok, that's it 841 */ 842 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 843 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 844 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 845 udf_fiiter_write_fi(&niter, NULL); 846 udf_fiiter_release(&niter); 847 848 /* 849 * The old entry may have moved due to new entry allocation. Find it 850 * again. 851 */ 852 udf_fiiter_release(&oiter); 853 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 854 if (retval) { 855 udf_err(old_dir->i_sb, 856 "failed to find renamed entry again in directory (ino %lu)\n", 857 old_dir->i_ino); 858 } else { 859 udf_fiiter_delete_entry(&oiter); 860 udf_fiiter_release(&oiter); 861 } 862 863 if (new_inode) { 864 new_inode->i_ctime = current_time(new_inode); 865 inode_dec_link_count(new_inode); 866 udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode), 867 -1); 868 } 869 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 870 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 871 mark_inode_dirty(old_dir); 872 mark_inode_dirty(new_dir); 873 874 if (has_diriter) { 875 diriter.fi.icb.extLocation = 876 cpu_to_lelb(UDF_I(new_dir)->i_location); 877 udf_update_tag((char *)&diriter.fi, 878 udf_dir_entry_len(&diriter.fi)); 879 udf_fiiter_write_fi(&diriter, NULL); 880 udf_fiiter_release(&diriter); 881 882 inode_dec_link_count(old_dir); 883 if (new_inode) 884 inode_dec_link_count(new_inode); 885 else { 886 inc_nlink(new_dir); 887 mark_inode_dirty(new_dir); 888 } 889 } 890 return 0; 891 out_oiter: 892 if (has_diriter) 893 udf_fiiter_release(&diriter); 894 udf_fiiter_release(&oiter); 895 896 return retval; 897 } 898 899 static struct dentry *udf_get_parent(struct dentry *child) 900 { 901 struct kernel_lb_addr tloc; 902 struct inode *inode = NULL; 903 struct udf_fileident_iter iter; 904 int err; 905 906 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 907 if (err) 908 return ERR_PTR(err); 909 910 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 911 udf_fiiter_release(&iter); 912 inode = udf_iget(child->d_sb, &tloc); 913 if (IS_ERR(inode)) 914 return ERR_CAST(inode); 915 916 return d_obtain_alias(inode); 917 } 918 919 920 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 921 u16 partref, __u32 generation) 922 { 923 struct inode *inode; 924 struct kernel_lb_addr loc; 925 926 if (block == 0) 927 return ERR_PTR(-ESTALE); 928 929 loc.logicalBlockNum = block; 930 loc.partitionReferenceNum = partref; 931 inode = udf_iget(sb, &loc); 932 933 if (IS_ERR(inode)) 934 return ERR_CAST(inode); 935 936 if (generation && inode->i_generation != generation) { 937 iput(inode); 938 return ERR_PTR(-ESTALE); 939 } 940 return d_obtain_alias(inode); 941 } 942 943 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 944 struct fid *fid, int fh_len, int fh_type) 945 { 946 if (fh_len < 3 || 947 (fh_type != FILEID_UDF_WITH_PARENT && 948 fh_type != FILEID_UDF_WITHOUT_PARENT)) 949 return NULL; 950 951 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 952 fid->udf.generation); 953 } 954 955 static struct dentry *udf_fh_to_parent(struct super_block *sb, 956 struct fid *fid, int fh_len, int fh_type) 957 { 958 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 959 return NULL; 960 961 return udf_nfs_get_inode(sb, fid->udf.parent_block, 962 fid->udf.parent_partref, 963 fid->udf.parent_generation); 964 } 965 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 966 struct inode *parent) 967 { 968 int len = *lenp; 969 struct kernel_lb_addr location = UDF_I(inode)->i_location; 970 struct fid *fid = (struct fid *)fh; 971 int type = FILEID_UDF_WITHOUT_PARENT; 972 973 if (parent && (len < 5)) { 974 *lenp = 5; 975 return FILEID_INVALID; 976 } else if (len < 3) { 977 *lenp = 3; 978 return FILEID_INVALID; 979 } 980 981 *lenp = 3; 982 fid->udf.block = location.logicalBlockNum; 983 fid->udf.partref = location.partitionReferenceNum; 984 fid->udf.parent_partref = 0; 985 fid->udf.generation = inode->i_generation; 986 987 if (parent) { 988 location = UDF_I(parent)->i_location; 989 fid->udf.parent_block = location.logicalBlockNum; 990 fid->udf.parent_partref = location.partitionReferenceNum; 991 fid->udf.parent_generation = inode->i_generation; 992 *lenp = 5; 993 type = FILEID_UDF_WITH_PARENT; 994 } 995 996 return type; 997 } 998 999 const struct export_operations udf_export_ops = { 1000 .encode_fh = udf_encode_fh, 1001 .fh_to_dentry = udf_fh_to_dentry, 1002 .fh_to_parent = udf_fh_to_parent, 1003 .get_parent = udf_get_parent, 1004 }; 1005 1006 const struct inode_operations udf_dir_inode_operations = { 1007 .lookup = udf_lookup, 1008 .create = udf_create, 1009 .link = udf_link, 1010 .unlink = udf_unlink, 1011 .symlink = udf_symlink, 1012 .mkdir = udf_mkdir, 1013 .rmdir = udf_rmdir, 1014 .mknod = udf_mknod, 1015 .rename = udf_rename, 1016 .tmpfile = udf_tmpfile, 1017 }; 1018