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 ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); 196 brelse(epos.bh); 197 if (ret < 0) { 198 *err = ret; 199 udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1); 200 return NULL; 201 } 202 mark_inode_dirty(inode); 203 204 /* Now fixup tags in moved directory entries */ 205 for (ret = udf_fiiter_init(&iter, inode, 0); 206 !ret && iter.pos < inode->i_size; 207 ret = udf_fiiter_advance(&iter)) { 208 iter.fi.descTag.tagLocation = cpu_to_le32(*block); 209 if (iter.fi.lengthOfImpUse != cpu_to_le16(0)) 210 impuse = dbh->b_data + iter.pos + 211 sizeof(struct fileIdentDesc); 212 else 213 impuse = NULL; 214 udf_fiiter_write_fi(&iter, impuse); 215 } 216 /* 217 * We don't expect the iteration to fail as the directory has been 218 * already verified to be correct 219 */ 220 WARN_ON_ONCE(ret); 221 udf_fiiter_release(&iter); 222 223 return dbh; 224 } 225 226 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry, 227 struct udf_fileident_iter *iter) 228 { 229 struct udf_inode_info *dinfo = UDF_I(dir); 230 int nfidlen, namelen = 0; 231 int ret; 232 int off, blksize = 1 << dir->i_blkbits; 233 udf_pblk_t block; 234 char name[UDF_NAME_LEN_CS0]; 235 236 if (dentry) { 237 if (!dentry->d_name.len) 238 return -EINVAL; 239 namelen = udf_put_filename(dir->i_sb, dentry->d_name.name, 240 dentry->d_name.len, 241 name, UDF_NAME_LEN_CS0); 242 if (!namelen) 243 return -ENAMETOOLONG; 244 } 245 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 246 247 for (ret = udf_fiiter_init(iter, dir, 0); 248 !ret && iter->pos < dir->i_size; 249 ret = udf_fiiter_advance(iter)) { 250 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 251 if (udf_dir_entry_len(&iter->fi) == nfidlen) { 252 iter->fi.descTag.tagSerialNum = cpu_to_le16(1); 253 iter->fi.fileVersionNum = cpu_to_le16(1); 254 iter->fi.fileCharacteristics = 0; 255 iter->fi.lengthFileIdent = namelen; 256 iter->fi.lengthOfImpUse = cpu_to_le16(0); 257 memcpy(iter->namebuf, name, namelen); 258 iter->name = iter->namebuf; 259 return 0; 260 } 261 } 262 } 263 if (ret) { 264 udf_fiiter_release(iter); 265 return ret; 266 } 267 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 268 blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) { 269 struct buffer_head *retbh; 270 271 udf_fiiter_release(iter); 272 /* 273 * FIXME: udf_expand_dir_adinicb does not need to return bh 274 * once other users are gone 275 */ 276 retbh = udf_expand_dir_adinicb(dir, &block, &ret); 277 if (!retbh) 278 return ret; 279 brelse(retbh); 280 ret = udf_fiiter_init(iter, dir, dir->i_size); 281 if (ret < 0) 282 return ret; 283 } 284 285 /* Get blocknumber to use for entry tag */ 286 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 287 block = dinfo->i_location.logicalBlockNum; 288 } else { 289 block = iter->eloc.logicalBlockNum + 290 ((iter->elen - 1) >> dir->i_blkbits); 291 } 292 off = iter->pos & (blksize - 1); 293 if (!off) 294 off = blksize; 295 /* Entry fits into current block? */ 296 if (blksize - udf_ext0_offset(dir) - off >= nfidlen) 297 goto store_fi; 298 299 ret = udf_fiiter_append_blk(iter); 300 if (ret) { 301 udf_fiiter_release(iter); 302 return ret; 303 } 304 305 /* Entry will be completely in the new block? Update tag location... */ 306 if (!(iter->pos & (blksize - 1))) 307 block = iter->eloc.logicalBlockNum + 308 ((iter->elen - 1) >> dir->i_blkbits); 309 store_fi: 310 memset(&iter->fi, 0, sizeof(struct fileIdentDesc)); 311 if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200) 312 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block, 313 sizeof(struct tag)); 314 else 315 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block, 316 sizeof(struct tag)); 317 iter->fi.fileVersionNum = cpu_to_le16(1); 318 iter->fi.lengthFileIdent = namelen; 319 iter->fi.lengthOfImpUse = cpu_to_le16(0); 320 memcpy(iter->namebuf, name, namelen); 321 iter->name = iter->namebuf; 322 323 dir->i_size += nfidlen; 324 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 325 dinfo->i_lenAlloc += nfidlen; 326 } else { 327 /* Truncate last extent to proper size */ 328 udf_fiiter_update_elen(iter, iter->elen - 329 (dinfo->i_lenExtents - dir->i_size)); 330 } 331 mark_inode_dirty(dir); 332 333 return 0; 334 } 335 336 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter) 337 { 338 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED; 339 340 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT)) 341 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad)); 342 343 udf_fiiter_write_fi(iter, NULL); 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 dir->i_ctime = dir->i_mtime = current_time(dir); 365 mark_inode_dirty(dir); 366 udf_fiiter_release(&iter); 367 d_instantiate_new(dentry, inode); 368 369 return 0; 370 } 371 372 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 373 struct dentry *dentry, umode_t mode, bool excl) 374 { 375 struct inode *inode = udf_new_inode(dir, mode); 376 377 if (IS_ERR(inode)) 378 return PTR_ERR(inode); 379 380 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 381 inode->i_data.a_ops = &udf_adinicb_aops; 382 else 383 inode->i_data.a_ops = &udf_aops; 384 inode->i_op = &udf_file_inode_operations; 385 inode->i_fop = &udf_file_operations; 386 mark_inode_dirty(inode); 387 388 return udf_add_nondir(dentry, inode); 389 } 390 391 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 392 struct file *file, umode_t mode) 393 { 394 struct inode *inode = udf_new_inode(dir, mode); 395 396 if (IS_ERR(inode)) 397 return PTR_ERR(inode); 398 399 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 400 inode->i_data.a_ops = &udf_adinicb_aops; 401 else 402 inode->i_data.a_ops = &udf_aops; 403 inode->i_op = &udf_file_inode_operations; 404 inode->i_fop = &udf_file_operations; 405 mark_inode_dirty(inode); 406 d_tmpfile(file, inode); 407 unlock_new_inode(inode); 408 return finish_open_simple(file, 0); 409 } 410 411 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 412 struct dentry *dentry, umode_t mode, dev_t rdev) 413 { 414 struct inode *inode; 415 416 if (!old_valid_dev(rdev)) 417 return -EINVAL; 418 419 inode = udf_new_inode(dir, mode); 420 if (IS_ERR(inode)) 421 return PTR_ERR(inode); 422 423 init_special_inode(inode, mode, rdev); 424 return udf_add_nondir(dentry, inode); 425 } 426 427 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 428 struct dentry *dentry, umode_t mode) 429 { 430 struct inode *inode; 431 struct udf_fileident_iter iter; 432 int err; 433 struct udf_inode_info *dinfo = UDF_I(dir); 434 struct udf_inode_info *iinfo; 435 436 inode = udf_new_inode(dir, S_IFDIR | mode); 437 if (IS_ERR(inode)) 438 return PTR_ERR(inode); 439 440 iinfo = UDF_I(inode); 441 inode->i_op = &udf_dir_inode_operations; 442 inode->i_fop = &udf_dir_operations; 443 err = udf_fiiter_add_entry(inode, NULL, &iter); 444 if (err) { 445 clear_nlink(inode); 446 discard_new_inode(inode); 447 return err; 448 } 449 set_nlink(inode, 2); 450 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 451 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 452 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 453 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 454 iter.fi.fileCharacteristics = 455 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 456 udf_fiiter_write_fi(&iter, NULL); 457 udf_fiiter_release(&iter); 458 mark_inode_dirty(inode); 459 460 err = udf_fiiter_add_entry(dir, dentry, &iter); 461 if (err) { 462 clear_nlink(inode); 463 discard_new_inode(inode); 464 return err; 465 } 466 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 467 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 468 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 469 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 470 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 471 udf_fiiter_write_fi(&iter, NULL); 472 udf_fiiter_release(&iter); 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 inode->i_ctime = dir->i_ctime = dir->i_mtime = 526 current_time(inode); 527 mark_inode_dirty(dir); 528 ret = 0; 529 end_rmdir: 530 udf_fiiter_release(&iter); 531 out: 532 return ret; 533 } 534 535 static int udf_unlink(struct inode *dir, struct dentry *dentry) 536 { 537 int ret; 538 struct inode *inode = d_inode(dentry); 539 struct udf_fileident_iter iter; 540 struct kernel_lb_addr tloc; 541 542 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 543 if (ret) 544 goto out; 545 546 ret = -EFSCORRUPTED; 547 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 548 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 549 goto end_unlink; 550 551 if (!inode->i_nlink) { 552 udf_debug("Deleting nonexistent file (%lu), %u\n", 553 inode->i_ino, inode->i_nlink); 554 set_nlink(inode, 1); 555 } 556 udf_fiiter_delete_entry(&iter); 557 dir->i_ctime = dir->i_mtime = current_time(dir); 558 mark_inode_dirty(dir); 559 inode_dec_link_count(inode); 560 inode->i_ctime = dir->i_ctime; 561 ret = 0; 562 end_unlink: 563 udf_fiiter_release(&iter); 564 out: 565 return ret; 566 } 567 568 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 569 struct dentry *dentry, const char *symname) 570 { 571 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 572 struct pathComponent *pc; 573 const char *compstart; 574 struct extent_position epos = {}; 575 int eoffset, elen = 0; 576 uint8_t *ea; 577 int err; 578 udf_pblk_t block; 579 unsigned char *name = NULL; 580 int namelen; 581 struct udf_inode_info *iinfo; 582 struct super_block *sb = dir->i_sb; 583 584 if (IS_ERR(inode)) 585 return PTR_ERR(inode); 586 587 iinfo = UDF_I(inode); 588 down_write(&iinfo->i_data_sem); 589 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 590 if (!name) { 591 err = -ENOMEM; 592 goto out_no_entry; 593 } 594 595 inode->i_data.a_ops = &udf_symlink_aops; 596 inode->i_op = &udf_symlink_inode_operations; 597 inode_nohighmem(inode); 598 599 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 600 struct kernel_lb_addr eloc; 601 uint32_t bsize; 602 603 block = udf_new_block(sb, inode, 604 iinfo->i_location.partitionReferenceNum, 605 iinfo->i_location.logicalBlockNum, &err); 606 if (!block) 607 goto out_no_entry; 608 epos.block = iinfo->i_location; 609 epos.offset = udf_file_entry_alloc_offset(inode); 610 epos.bh = NULL; 611 eloc.logicalBlockNum = block; 612 eloc.partitionReferenceNum = 613 iinfo->i_location.partitionReferenceNum; 614 bsize = sb->s_blocksize; 615 iinfo->i_lenExtents = bsize; 616 err = udf_add_aext(inode, &epos, &eloc, bsize, 0); 617 brelse(epos.bh); 618 if (err < 0) { 619 udf_free_blocks(sb, inode, &eloc, 0, 1); 620 goto out_no_entry; 621 } 622 623 block = udf_get_pblock(sb, block, 624 iinfo->i_location.partitionReferenceNum, 625 0); 626 epos.bh = udf_tgetblk(sb, block); 627 if (unlikely(!epos.bh)) { 628 err = -ENOMEM; 629 udf_free_blocks(sb, inode, &eloc, 0, 1); 630 goto out_no_entry; 631 } 632 lock_buffer(epos.bh); 633 memset(epos.bh->b_data, 0x00, bsize); 634 set_buffer_uptodate(epos.bh); 635 unlock_buffer(epos.bh); 636 mark_buffer_dirty_inode(epos.bh, inode); 637 ea = epos.bh->b_data + udf_ext0_offset(inode); 638 } else 639 ea = iinfo->i_data + iinfo->i_lenEAttr; 640 641 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 642 pc = (struct pathComponent *)ea; 643 644 if (*symname == '/') { 645 do { 646 symname++; 647 } while (*symname == '/'); 648 649 pc->componentType = 1; 650 pc->lengthComponentIdent = 0; 651 pc->componentFileVersionNum = 0; 652 elen += sizeof(struct pathComponent); 653 } 654 655 err = -ENAMETOOLONG; 656 657 while (*symname) { 658 if (elen + sizeof(struct pathComponent) > eoffset) 659 goto out_no_entry; 660 661 pc = (struct pathComponent *)(ea + elen); 662 663 compstart = symname; 664 665 do { 666 symname++; 667 } while (*symname && *symname != '/'); 668 669 pc->componentType = 5; 670 pc->lengthComponentIdent = 0; 671 pc->componentFileVersionNum = 0; 672 if (compstart[0] == '.') { 673 if ((symname - compstart) == 1) 674 pc->componentType = 4; 675 else if ((symname - compstart) == 2 && 676 compstart[1] == '.') 677 pc->componentType = 3; 678 } 679 680 if (pc->componentType == 5) { 681 namelen = udf_put_filename(sb, compstart, 682 symname - compstart, 683 name, UDF_NAME_LEN_CS0); 684 if (!namelen) 685 goto out_no_entry; 686 687 if (elen + sizeof(struct pathComponent) + namelen > 688 eoffset) 689 goto out_no_entry; 690 else 691 pc->lengthComponentIdent = namelen; 692 693 memcpy(pc->componentIdent, name, namelen); 694 } 695 696 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 697 698 if (*symname) { 699 do { 700 symname++; 701 } while (*symname == '/'); 702 } 703 } 704 705 brelse(epos.bh); 706 inode->i_size = elen; 707 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 708 iinfo->i_lenAlloc = inode->i_size; 709 else 710 udf_truncate_tail_extent(inode); 711 mark_inode_dirty(inode); 712 up_write(&iinfo->i_data_sem); 713 714 err = udf_add_nondir(dentry, inode); 715 out: 716 kfree(name); 717 return err; 718 719 out_no_entry: 720 up_write(&iinfo->i_data_sem); 721 inode_dec_link_count(inode); 722 discard_new_inode(inode); 723 goto out; 724 } 725 726 static int udf_link(struct dentry *old_dentry, struct inode *dir, 727 struct dentry *dentry) 728 { 729 struct inode *inode = d_inode(old_dentry); 730 struct udf_fileident_iter iter; 731 int err; 732 733 err = udf_fiiter_add_entry(dir, dentry, &iter); 734 if (err) 735 return err; 736 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 737 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 738 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 739 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 740 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 741 } 742 udf_fiiter_write_fi(&iter, NULL); 743 udf_fiiter_release(&iter); 744 745 inc_nlink(inode); 746 inode->i_ctime = current_time(inode); 747 mark_inode_dirty(inode); 748 dir->i_ctime = dir->i_mtime = current_time(dir); 749 mark_inode_dirty(dir); 750 ihold(inode); 751 d_instantiate(dentry, inode); 752 753 return 0; 754 } 755 756 /* Anybody can rename anything with this: the permission checks are left to the 757 * higher-level routines. 758 */ 759 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 760 struct dentry *old_dentry, struct inode *new_dir, 761 struct dentry *new_dentry, unsigned int flags) 762 { 763 struct inode *old_inode = d_inode(old_dentry); 764 struct inode *new_inode = d_inode(new_dentry); 765 struct udf_fileident_iter oiter, niter, diriter; 766 bool has_diriter = false; 767 int retval; 768 struct kernel_lb_addr tloc; 769 770 if (flags & ~RENAME_NOREPLACE) 771 return -EINVAL; 772 773 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 774 if (retval) 775 return retval; 776 777 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 778 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 779 retval = -ENOENT; 780 goto out_oiter; 781 } 782 783 if (S_ISDIR(old_inode->i_mode)) { 784 if (new_inode) { 785 retval = -ENOTEMPTY; 786 if (!empty_dir(new_inode)) 787 goto out_oiter; 788 } 789 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 790 &diriter); 791 if (retval == -ENOENT) { 792 udf_err(old_inode->i_sb, 793 "directory (ino %lu) has no '..' entry\n", 794 old_inode->i_ino); 795 retval = -EFSCORRUPTED; 796 } 797 if (retval) 798 goto out_oiter; 799 has_diriter = true; 800 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 801 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 802 old_dir->i_ino) { 803 retval = -EFSCORRUPTED; 804 udf_err(old_inode->i_sb, 805 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 806 old_inode->i_ino, old_dir->i_ino, 807 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 808 goto out_oiter; 809 } 810 } 811 812 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 813 if (retval && retval != -ENOENT) 814 goto out_oiter; 815 /* Entry found but not passed by VFS? */ 816 if (!retval && !new_inode) { 817 retval = -EFSCORRUPTED; 818 udf_fiiter_release(&niter); 819 goto out_oiter; 820 } 821 /* Entry not found? Need to add one... */ 822 if (retval) { 823 udf_fiiter_release(&niter); 824 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 825 if (retval) 826 goto out_oiter; 827 } 828 829 /* 830 * Like most other Unix systems, set the ctime for inodes on a 831 * rename. 832 */ 833 old_inode->i_ctime = current_time(old_inode); 834 mark_inode_dirty(old_inode); 835 836 /* 837 * ok, that's it 838 */ 839 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 840 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 841 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 842 udf_fiiter_write_fi(&niter, NULL); 843 udf_fiiter_release(&niter); 844 845 /* 846 * The old entry may have moved due to new entry allocation. Find it 847 * again. 848 */ 849 udf_fiiter_release(&oiter); 850 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 851 if (retval) { 852 udf_err(old_dir->i_sb, 853 "failed to find renamed entry again in directory (ino %lu)\n", 854 old_dir->i_ino); 855 } else { 856 udf_fiiter_delete_entry(&oiter); 857 udf_fiiter_release(&oiter); 858 } 859 860 if (new_inode) { 861 new_inode->i_ctime = current_time(new_inode); 862 inode_dec_link_count(new_inode); 863 } 864 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 865 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 866 mark_inode_dirty(old_dir); 867 mark_inode_dirty(new_dir); 868 869 if (has_diriter) { 870 diriter.fi.icb.extLocation = 871 cpu_to_lelb(UDF_I(new_dir)->i_location); 872 udf_update_tag((char *)&diriter.fi, 873 udf_dir_entry_len(&diriter.fi)); 874 udf_fiiter_write_fi(&diriter, NULL); 875 udf_fiiter_release(&diriter); 876 877 inode_dec_link_count(old_dir); 878 if (new_inode) 879 inode_dec_link_count(new_inode); 880 else { 881 inc_nlink(new_dir); 882 mark_inode_dirty(new_dir); 883 } 884 } 885 return 0; 886 out_oiter: 887 if (has_diriter) 888 udf_fiiter_release(&diriter); 889 udf_fiiter_release(&oiter); 890 891 return retval; 892 } 893 894 static struct dentry *udf_get_parent(struct dentry *child) 895 { 896 struct kernel_lb_addr tloc; 897 struct inode *inode = NULL; 898 struct udf_fileident_iter iter; 899 int err; 900 901 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 902 if (err) 903 return ERR_PTR(err); 904 905 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 906 udf_fiiter_release(&iter); 907 inode = udf_iget(child->d_sb, &tloc); 908 if (IS_ERR(inode)) 909 return ERR_CAST(inode); 910 911 return d_obtain_alias(inode); 912 } 913 914 915 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 916 u16 partref, __u32 generation) 917 { 918 struct inode *inode; 919 struct kernel_lb_addr loc; 920 921 if (block == 0) 922 return ERR_PTR(-ESTALE); 923 924 loc.logicalBlockNum = block; 925 loc.partitionReferenceNum = partref; 926 inode = udf_iget(sb, &loc); 927 928 if (IS_ERR(inode)) 929 return ERR_CAST(inode); 930 931 if (generation && inode->i_generation != generation) { 932 iput(inode); 933 return ERR_PTR(-ESTALE); 934 } 935 return d_obtain_alias(inode); 936 } 937 938 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 939 struct fid *fid, int fh_len, int fh_type) 940 { 941 if (fh_len < 3 || 942 (fh_type != FILEID_UDF_WITH_PARENT && 943 fh_type != FILEID_UDF_WITHOUT_PARENT)) 944 return NULL; 945 946 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 947 fid->udf.generation); 948 } 949 950 static struct dentry *udf_fh_to_parent(struct super_block *sb, 951 struct fid *fid, int fh_len, int fh_type) 952 { 953 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 954 return NULL; 955 956 return udf_nfs_get_inode(sb, fid->udf.parent_block, 957 fid->udf.parent_partref, 958 fid->udf.parent_generation); 959 } 960 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 961 struct inode *parent) 962 { 963 int len = *lenp; 964 struct kernel_lb_addr location = UDF_I(inode)->i_location; 965 struct fid *fid = (struct fid *)fh; 966 int type = FILEID_UDF_WITHOUT_PARENT; 967 968 if (parent && (len < 5)) { 969 *lenp = 5; 970 return FILEID_INVALID; 971 } else if (len < 3) { 972 *lenp = 3; 973 return FILEID_INVALID; 974 } 975 976 *lenp = 3; 977 fid->udf.block = location.logicalBlockNum; 978 fid->udf.partref = location.partitionReferenceNum; 979 fid->udf.parent_partref = 0; 980 fid->udf.generation = inode->i_generation; 981 982 if (parent) { 983 location = UDF_I(parent)->i_location; 984 fid->udf.parent_block = location.logicalBlockNum; 985 fid->udf.parent_partref = location.partitionReferenceNum; 986 fid->udf.parent_generation = inode->i_generation; 987 *lenp = 5; 988 type = FILEID_UDF_WITH_PARENT; 989 } 990 991 return type; 992 } 993 994 const struct export_operations udf_export_ops = { 995 .encode_fh = udf_encode_fh, 996 .fh_to_dentry = udf_fh_to_dentry, 997 .fh_to_parent = udf_fh_to_parent, 998 .get_parent = udf_get_parent, 999 }; 1000 1001 const struct inode_operations udf_dir_inode_operations = { 1002 .lookup = udf_lookup, 1003 .create = udf_create, 1004 .link = udf_link, 1005 .unlink = udf_unlink, 1006 .symlink = udf_symlink, 1007 .mkdir = udf_mkdir, 1008 .rmdir = udf_rmdir, 1009 .mknod = udf_mknod, 1010 .rename = udf_rename, 1011 .tmpfile = udf_tmpfile, 1012 }; 1013