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 udf_add_aext(inode, &epos, &eloc, bsize, 0); 617 brelse(epos.bh); 618 619 block = udf_get_pblock(sb, block, 620 iinfo->i_location.partitionReferenceNum, 621 0); 622 epos.bh = udf_tgetblk(sb, block); 623 if (unlikely(!epos.bh)) { 624 err = -ENOMEM; 625 goto out_no_entry; 626 } 627 lock_buffer(epos.bh); 628 memset(epos.bh->b_data, 0x00, bsize); 629 set_buffer_uptodate(epos.bh); 630 unlock_buffer(epos.bh); 631 mark_buffer_dirty_inode(epos.bh, inode); 632 ea = epos.bh->b_data + udf_ext0_offset(inode); 633 } else 634 ea = iinfo->i_data + iinfo->i_lenEAttr; 635 636 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 637 pc = (struct pathComponent *)ea; 638 639 if (*symname == '/') { 640 do { 641 symname++; 642 } while (*symname == '/'); 643 644 pc->componentType = 1; 645 pc->lengthComponentIdent = 0; 646 pc->componentFileVersionNum = 0; 647 elen += sizeof(struct pathComponent); 648 } 649 650 err = -ENAMETOOLONG; 651 652 while (*symname) { 653 if (elen + sizeof(struct pathComponent) > eoffset) 654 goto out_no_entry; 655 656 pc = (struct pathComponent *)(ea + elen); 657 658 compstart = symname; 659 660 do { 661 symname++; 662 } while (*symname && *symname != '/'); 663 664 pc->componentType = 5; 665 pc->lengthComponentIdent = 0; 666 pc->componentFileVersionNum = 0; 667 if (compstart[0] == '.') { 668 if ((symname - compstart) == 1) 669 pc->componentType = 4; 670 else if ((symname - compstart) == 2 && 671 compstart[1] == '.') 672 pc->componentType = 3; 673 } 674 675 if (pc->componentType == 5) { 676 namelen = udf_put_filename(sb, compstart, 677 symname - compstart, 678 name, UDF_NAME_LEN_CS0); 679 if (!namelen) 680 goto out_no_entry; 681 682 if (elen + sizeof(struct pathComponent) + namelen > 683 eoffset) 684 goto out_no_entry; 685 else 686 pc->lengthComponentIdent = namelen; 687 688 memcpy(pc->componentIdent, name, namelen); 689 } 690 691 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 692 693 if (*symname) { 694 do { 695 symname++; 696 } while (*symname == '/'); 697 } 698 } 699 700 brelse(epos.bh); 701 inode->i_size = elen; 702 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 703 iinfo->i_lenAlloc = inode->i_size; 704 else 705 udf_truncate_tail_extent(inode); 706 mark_inode_dirty(inode); 707 up_write(&iinfo->i_data_sem); 708 709 err = udf_add_nondir(dentry, inode); 710 out: 711 kfree(name); 712 return err; 713 714 out_no_entry: 715 up_write(&iinfo->i_data_sem); 716 inode_dec_link_count(inode); 717 discard_new_inode(inode); 718 goto out; 719 } 720 721 static int udf_link(struct dentry *old_dentry, struct inode *dir, 722 struct dentry *dentry) 723 { 724 struct inode *inode = d_inode(old_dentry); 725 struct udf_fileident_iter iter; 726 int err; 727 728 err = udf_fiiter_add_entry(dir, dentry, &iter); 729 if (err) 730 return err; 731 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 732 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 733 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 734 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 735 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 736 } 737 udf_fiiter_write_fi(&iter, NULL); 738 udf_fiiter_release(&iter); 739 740 inc_nlink(inode); 741 inode->i_ctime = current_time(inode); 742 mark_inode_dirty(inode); 743 dir->i_ctime = dir->i_mtime = current_time(dir); 744 mark_inode_dirty(dir); 745 ihold(inode); 746 d_instantiate(dentry, inode); 747 748 return 0; 749 } 750 751 /* Anybody can rename anything with this: the permission checks are left to the 752 * higher-level routines. 753 */ 754 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 755 struct dentry *old_dentry, struct inode *new_dir, 756 struct dentry *new_dentry, unsigned int flags) 757 { 758 struct inode *old_inode = d_inode(old_dentry); 759 struct inode *new_inode = d_inode(new_dentry); 760 struct udf_fileident_iter oiter, niter, diriter; 761 bool has_diriter = false; 762 int retval; 763 struct kernel_lb_addr tloc; 764 765 if (flags & ~RENAME_NOREPLACE) 766 return -EINVAL; 767 768 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 769 if (retval) 770 return retval; 771 772 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 773 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 774 retval = -ENOENT; 775 goto out_oiter; 776 } 777 778 if (S_ISDIR(old_inode->i_mode)) { 779 if (new_inode) { 780 retval = -ENOTEMPTY; 781 if (!empty_dir(new_inode)) 782 goto out_oiter; 783 } 784 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 785 &diriter); 786 if (retval == -ENOENT) { 787 udf_err(old_inode->i_sb, 788 "directory (ino %lu) has no '..' entry\n", 789 old_inode->i_ino); 790 retval = -EFSCORRUPTED; 791 } 792 if (retval) 793 goto out_oiter; 794 has_diriter = true; 795 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 796 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 797 old_dir->i_ino) { 798 retval = -EFSCORRUPTED; 799 udf_err(old_inode->i_sb, 800 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 801 old_inode->i_ino, old_dir->i_ino, 802 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 803 goto out_oiter; 804 } 805 } 806 807 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 808 if (retval && retval != -ENOENT) 809 goto out_oiter; 810 /* Entry found but not passed by VFS? */ 811 if (!retval && !new_inode) { 812 retval = -EFSCORRUPTED; 813 udf_fiiter_release(&niter); 814 goto out_oiter; 815 } 816 /* Entry not found? Need to add one... */ 817 if (retval) { 818 udf_fiiter_release(&niter); 819 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 820 if (retval) 821 goto out_oiter; 822 } 823 824 /* 825 * Like most other Unix systems, set the ctime for inodes on a 826 * rename. 827 */ 828 old_inode->i_ctime = current_time(old_inode); 829 mark_inode_dirty(old_inode); 830 831 /* 832 * ok, that's it 833 */ 834 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 835 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 836 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 837 udf_fiiter_write_fi(&niter, NULL); 838 udf_fiiter_release(&niter); 839 840 /* 841 * The old entry may have moved due to new entry allocation. Find it 842 * again. 843 */ 844 udf_fiiter_release(&oiter); 845 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 846 if (retval) { 847 udf_err(old_dir->i_sb, 848 "failed to find renamed entry again in directory (ino %lu)\n", 849 old_dir->i_ino); 850 } else { 851 udf_fiiter_delete_entry(&oiter); 852 udf_fiiter_release(&oiter); 853 } 854 855 if (new_inode) { 856 new_inode->i_ctime = current_time(new_inode); 857 inode_dec_link_count(new_inode); 858 } 859 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 860 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 861 mark_inode_dirty(old_dir); 862 mark_inode_dirty(new_dir); 863 864 if (has_diriter) { 865 diriter.fi.icb.extLocation = 866 cpu_to_lelb(UDF_I(new_dir)->i_location); 867 udf_update_tag((char *)&diriter.fi, 868 udf_dir_entry_len(&diriter.fi)); 869 udf_fiiter_write_fi(&diriter, NULL); 870 udf_fiiter_release(&diriter); 871 872 inode_dec_link_count(old_dir); 873 if (new_inode) 874 inode_dec_link_count(new_inode); 875 else { 876 inc_nlink(new_dir); 877 mark_inode_dirty(new_dir); 878 } 879 } 880 return 0; 881 out_oiter: 882 if (has_diriter) 883 udf_fiiter_release(&diriter); 884 udf_fiiter_release(&oiter); 885 886 return retval; 887 } 888 889 static struct dentry *udf_get_parent(struct dentry *child) 890 { 891 struct kernel_lb_addr tloc; 892 struct inode *inode = NULL; 893 struct udf_fileident_iter iter; 894 int err; 895 896 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 897 if (err) 898 return ERR_PTR(err); 899 900 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 901 udf_fiiter_release(&iter); 902 inode = udf_iget(child->d_sb, &tloc); 903 if (IS_ERR(inode)) 904 return ERR_CAST(inode); 905 906 return d_obtain_alias(inode); 907 } 908 909 910 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 911 u16 partref, __u32 generation) 912 { 913 struct inode *inode; 914 struct kernel_lb_addr loc; 915 916 if (block == 0) 917 return ERR_PTR(-ESTALE); 918 919 loc.logicalBlockNum = block; 920 loc.partitionReferenceNum = partref; 921 inode = udf_iget(sb, &loc); 922 923 if (IS_ERR(inode)) 924 return ERR_CAST(inode); 925 926 if (generation && inode->i_generation != generation) { 927 iput(inode); 928 return ERR_PTR(-ESTALE); 929 } 930 return d_obtain_alias(inode); 931 } 932 933 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 934 struct fid *fid, int fh_len, int fh_type) 935 { 936 if (fh_len < 3 || 937 (fh_type != FILEID_UDF_WITH_PARENT && 938 fh_type != FILEID_UDF_WITHOUT_PARENT)) 939 return NULL; 940 941 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 942 fid->udf.generation); 943 } 944 945 static struct dentry *udf_fh_to_parent(struct super_block *sb, 946 struct fid *fid, int fh_len, int fh_type) 947 { 948 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 949 return NULL; 950 951 return udf_nfs_get_inode(sb, fid->udf.parent_block, 952 fid->udf.parent_partref, 953 fid->udf.parent_generation); 954 } 955 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 956 struct inode *parent) 957 { 958 int len = *lenp; 959 struct kernel_lb_addr location = UDF_I(inode)->i_location; 960 struct fid *fid = (struct fid *)fh; 961 int type = FILEID_UDF_WITHOUT_PARENT; 962 963 if (parent && (len < 5)) { 964 *lenp = 5; 965 return FILEID_INVALID; 966 } else if (len < 3) { 967 *lenp = 3; 968 return FILEID_INVALID; 969 } 970 971 *lenp = 3; 972 fid->udf.block = location.logicalBlockNum; 973 fid->udf.partref = location.partitionReferenceNum; 974 fid->udf.parent_partref = 0; 975 fid->udf.generation = inode->i_generation; 976 977 if (parent) { 978 location = UDF_I(parent)->i_location; 979 fid->udf.parent_block = location.logicalBlockNum; 980 fid->udf.parent_partref = location.partitionReferenceNum; 981 fid->udf.parent_generation = inode->i_generation; 982 *lenp = 5; 983 type = FILEID_UDF_WITH_PARENT; 984 } 985 986 return type; 987 } 988 989 const struct export_operations udf_export_ops = { 990 .encode_fh = udf_encode_fh, 991 .fh_to_dentry = udf_fh_to_dentry, 992 .fh_to_parent = udf_fh_to_parent, 993 .get_parent = udf_get_parent, 994 }; 995 996 const struct inode_operations udf_dir_inode_operations = { 997 .lookup = udf_lookup, 998 .create = udf_create, 999 .link = udf_link, 1000 .unlink = udf_unlink, 1001 .symlink = udf_symlink, 1002 .mkdir = udf_mkdir, 1003 .rmdir = udf_rmdir, 1004 .mknod = udf_mknod, 1005 .rename = udf_rename, 1006 .tmpfile = udf_tmpfile, 1007 }; 1008