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 int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block) 140 { 141 udf_pblk_t newblock; 142 struct buffer_head *dbh = NULL; 143 struct kernel_lb_addr eloc; 144 struct extent_position epos; 145 uint8_t alloctype; 146 struct udf_inode_info *iinfo = UDF_I(inode); 147 struct udf_fileident_iter iter; 148 uint8_t *impuse; 149 int ret; 150 151 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 152 alloctype = ICBTAG_FLAG_AD_SHORT; 153 else 154 alloctype = ICBTAG_FLAG_AD_LONG; 155 156 if (!inode->i_size) { 157 iinfo->i_alloc_type = alloctype; 158 mark_inode_dirty(inode); 159 return 0; 160 } 161 162 /* alloc block, and copy data to it */ 163 *block = udf_new_block(inode->i_sb, inode, 164 iinfo->i_location.partitionReferenceNum, 165 iinfo->i_location.logicalBlockNum, &ret); 166 if (!(*block)) 167 return ret; 168 newblock = udf_get_pblock(inode->i_sb, *block, 169 iinfo->i_location.partitionReferenceNum, 170 0); 171 if (newblock == 0xffffffff) 172 return -EFSCORRUPTED; 173 dbh = sb_getblk(inode->i_sb, newblock); 174 if (!dbh) 175 return -ENOMEM; 176 lock_buffer(dbh); 177 memcpy(dbh->b_data, iinfo->i_data, inode->i_size); 178 memset(dbh->b_data + inode->i_size, 0, 179 inode->i_sb->s_blocksize - inode->i_size); 180 set_buffer_uptodate(dbh); 181 unlock_buffer(dbh); 182 183 /* Drop inline data, add block instead */ 184 iinfo->i_alloc_type = alloctype; 185 memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc); 186 iinfo->i_lenAlloc = 0; 187 eloc.logicalBlockNum = *block; 188 eloc.partitionReferenceNum = 189 iinfo->i_location.partitionReferenceNum; 190 iinfo->i_lenExtents = inode->i_size; 191 epos.bh = NULL; 192 epos.block = iinfo->i_location; 193 epos.offset = udf_file_entry_alloc_offset(inode); 194 ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); 195 brelse(epos.bh); 196 if (ret < 0) { 197 brelse(dbh); 198 udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1); 199 return ret; 200 } 201 mark_inode_dirty(inode); 202 203 /* Now fixup tags in moved directory entries */ 204 for (ret = udf_fiiter_init(&iter, inode, 0); 205 !ret && iter.pos < inode->i_size; 206 ret = udf_fiiter_advance(&iter)) { 207 iter.fi.descTag.tagLocation = cpu_to_le32(*block); 208 if (iter.fi.lengthOfImpUse != cpu_to_le16(0)) 209 impuse = dbh->b_data + iter.pos + 210 sizeof(struct fileIdentDesc); 211 else 212 impuse = NULL; 213 udf_fiiter_write_fi(&iter, impuse); 214 } 215 brelse(dbh); 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 0; 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 udf_fiiter_release(iter); 270 ret = udf_expand_dir_adinicb(dir, &block); 271 if (ret) 272 return ret; 273 ret = udf_fiiter_init(iter, dir, dir->i_size); 274 if (ret < 0) 275 return ret; 276 } 277 278 /* Get blocknumber to use for entry tag */ 279 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 280 block = dinfo->i_location.logicalBlockNum; 281 } else { 282 block = iter->eloc.logicalBlockNum + 283 ((iter->elen - 1) >> dir->i_blkbits); 284 } 285 off = iter->pos & (blksize - 1); 286 if (!off) 287 off = blksize; 288 /* Entry fits into current block? */ 289 if (blksize - udf_ext0_offset(dir) - off >= nfidlen) 290 goto store_fi; 291 292 ret = udf_fiiter_append_blk(iter); 293 if (ret) { 294 udf_fiiter_release(iter); 295 return ret; 296 } 297 298 /* Entry will be completely in the new block? Update tag location... */ 299 if (!(iter->pos & (blksize - 1))) 300 block = iter->eloc.logicalBlockNum + 301 ((iter->elen - 1) >> dir->i_blkbits); 302 store_fi: 303 memset(&iter->fi, 0, sizeof(struct fileIdentDesc)); 304 if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200) 305 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block, 306 sizeof(struct tag)); 307 else 308 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block, 309 sizeof(struct tag)); 310 iter->fi.fileVersionNum = cpu_to_le16(1); 311 iter->fi.lengthFileIdent = namelen; 312 iter->fi.lengthOfImpUse = cpu_to_le16(0); 313 memcpy(iter->namebuf, name, namelen); 314 iter->name = iter->namebuf; 315 316 dir->i_size += nfidlen; 317 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 318 dinfo->i_lenAlloc += nfidlen; 319 } else { 320 /* Truncate last extent to proper size */ 321 udf_fiiter_update_elen(iter, iter->elen - 322 (dinfo->i_lenExtents - dir->i_size)); 323 } 324 mark_inode_dirty(dir); 325 326 return 0; 327 } 328 329 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter) 330 { 331 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED; 332 333 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT)) 334 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad)); 335 336 udf_fiiter_write_fi(iter, NULL); 337 } 338 339 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 340 { 341 struct udf_inode_info *iinfo = UDF_I(inode); 342 struct inode *dir = d_inode(dentry->d_parent); 343 struct udf_fileident_iter iter; 344 int err; 345 346 err = udf_fiiter_add_entry(dir, dentry, &iter); 347 if (err) { 348 inode_dec_link_count(inode); 349 discard_new_inode(inode); 350 return err; 351 } 352 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 353 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 354 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 355 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 356 udf_fiiter_write_fi(&iter, NULL); 357 dir->i_ctime = dir->i_mtime = current_time(dir); 358 mark_inode_dirty(dir); 359 udf_fiiter_release(&iter); 360 d_instantiate_new(dentry, inode); 361 362 return 0; 363 } 364 365 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 366 struct dentry *dentry, umode_t mode, bool excl) 367 { 368 struct inode *inode = udf_new_inode(dir, mode); 369 370 if (IS_ERR(inode)) 371 return PTR_ERR(inode); 372 373 inode->i_data.a_ops = &udf_aops; 374 inode->i_op = &udf_file_inode_operations; 375 inode->i_fop = &udf_file_operations; 376 mark_inode_dirty(inode); 377 378 return udf_add_nondir(dentry, inode); 379 } 380 381 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 382 struct file *file, umode_t mode) 383 { 384 struct inode *inode = udf_new_inode(dir, mode); 385 386 if (IS_ERR(inode)) 387 return PTR_ERR(inode); 388 389 inode->i_data.a_ops = &udf_aops; 390 inode->i_op = &udf_file_inode_operations; 391 inode->i_fop = &udf_file_operations; 392 mark_inode_dirty(inode); 393 d_tmpfile(file, inode); 394 unlock_new_inode(inode); 395 return finish_open_simple(file, 0); 396 } 397 398 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 399 struct dentry *dentry, umode_t mode, dev_t rdev) 400 { 401 struct inode *inode; 402 403 if (!old_valid_dev(rdev)) 404 return -EINVAL; 405 406 inode = udf_new_inode(dir, mode); 407 if (IS_ERR(inode)) 408 return PTR_ERR(inode); 409 410 init_special_inode(inode, mode, rdev); 411 return udf_add_nondir(dentry, inode); 412 } 413 414 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 415 struct dentry *dentry, umode_t mode) 416 { 417 struct inode *inode; 418 struct udf_fileident_iter iter; 419 int err; 420 struct udf_inode_info *dinfo = UDF_I(dir); 421 struct udf_inode_info *iinfo; 422 423 inode = udf_new_inode(dir, S_IFDIR | mode); 424 if (IS_ERR(inode)) 425 return PTR_ERR(inode); 426 427 iinfo = UDF_I(inode); 428 inode->i_op = &udf_dir_inode_operations; 429 inode->i_fop = &udf_dir_operations; 430 err = udf_fiiter_add_entry(inode, NULL, &iter); 431 if (err) { 432 clear_nlink(inode); 433 discard_new_inode(inode); 434 return err; 435 } 436 set_nlink(inode, 2); 437 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 438 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 439 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 440 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 441 iter.fi.fileCharacteristics = 442 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 443 udf_fiiter_write_fi(&iter, NULL); 444 udf_fiiter_release(&iter); 445 mark_inode_dirty(inode); 446 447 err = udf_fiiter_add_entry(dir, dentry, &iter); 448 if (err) { 449 clear_nlink(inode); 450 discard_new_inode(inode); 451 return err; 452 } 453 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 454 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 455 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 456 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 457 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 458 udf_fiiter_write_fi(&iter, NULL); 459 udf_fiiter_release(&iter); 460 inc_nlink(dir); 461 dir->i_ctime = dir->i_mtime = current_time(dir); 462 mark_inode_dirty(dir); 463 d_instantiate_new(dentry, inode); 464 465 return 0; 466 } 467 468 static int empty_dir(struct inode *dir) 469 { 470 struct udf_fileident_iter iter; 471 int ret; 472 473 for (ret = udf_fiiter_init(&iter, dir, 0); 474 !ret && iter.pos < dir->i_size; 475 ret = udf_fiiter_advance(&iter)) { 476 if (iter.fi.lengthFileIdent && 477 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 478 udf_fiiter_release(&iter); 479 return 0; 480 } 481 } 482 udf_fiiter_release(&iter); 483 484 return 1; 485 } 486 487 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 488 { 489 int ret; 490 struct inode *inode = d_inode(dentry); 491 struct udf_fileident_iter iter; 492 struct kernel_lb_addr tloc; 493 494 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 495 if (ret) 496 goto out; 497 498 ret = -EFSCORRUPTED; 499 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 500 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 501 goto end_rmdir; 502 ret = -ENOTEMPTY; 503 if (!empty_dir(inode)) 504 goto end_rmdir; 505 udf_fiiter_delete_entry(&iter); 506 if (inode->i_nlink != 2) 507 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 508 inode->i_nlink); 509 clear_nlink(inode); 510 inode->i_size = 0; 511 inode_dec_link_count(dir); 512 inode->i_ctime = dir->i_ctime = dir->i_mtime = 513 current_time(inode); 514 mark_inode_dirty(dir); 515 ret = 0; 516 end_rmdir: 517 udf_fiiter_release(&iter); 518 out: 519 return ret; 520 } 521 522 static int udf_unlink(struct inode *dir, struct dentry *dentry) 523 { 524 int ret; 525 struct inode *inode = d_inode(dentry); 526 struct udf_fileident_iter iter; 527 struct kernel_lb_addr tloc; 528 529 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 530 if (ret) 531 goto out; 532 533 ret = -EFSCORRUPTED; 534 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 535 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 536 goto end_unlink; 537 538 if (!inode->i_nlink) { 539 udf_debug("Deleting nonexistent file (%lu), %u\n", 540 inode->i_ino, inode->i_nlink); 541 set_nlink(inode, 1); 542 } 543 udf_fiiter_delete_entry(&iter); 544 dir->i_ctime = dir->i_mtime = current_time(dir); 545 mark_inode_dirty(dir); 546 inode_dec_link_count(inode); 547 inode->i_ctime = dir->i_ctime; 548 ret = 0; 549 end_unlink: 550 udf_fiiter_release(&iter); 551 out: 552 return ret; 553 } 554 555 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 556 struct dentry *dentry, const char *symname) 557 { 558 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 559 struct pathComponent *pc; 560 const char *compstart; 561 struct extent_position epos = {}; 562 int eoffset, elen = 0; 563 uint8_t *ea; 564 int err; 565 udf_pblk_t block; 566 unsigned char *name = NULL; 567 int namelen; 568 struct udf_inode_info *iinfo; 569 struct super_block *sb = dir->i_sb; 570 571 if (IS_ERR(inode)) 572 return PTR_ERR(inode); 573 574 iinfo = UDF_I(inode); 575 down_write(&iinfo->i_data_sem); 576 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 577 if (!name) { 578 err = -ENOMEM; 579 goto out_no_entry; 580 } 581 582 inode->i_data.a_ops = &udf_symlink_aops; 583 inode->i_op = &udf_symlink_inode_operations; 584 inode_nohighmem(inode); 585 586 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 587 struct kernel_lb_addr eloc; 588 uint32_t bsize; 589 590 block = udf_new_block(sb, inode, 591 iinfo->i_location.partitionReferenceNum, 592 iinfo->i_location.logicalBlockNum, &err); 593 if (!block) 594 goto out_no_entry; 595 epos.block = iinfo->i_location; 596 epos.offset = udf_file_entry_alloc_offset(inode); 597 epos.bh = NULL; 598 eloc.logicalBlockNum = block; 599 eloc.partitionReferenceNum = 600 iinfo->i_location.partitionReferenceNum; 601 bsize = sb->s_blocksize; 602 iinfo->i_lenExtents = bsize; 603 err = udf_add_aext(inode, &epos, &eloc, bsize, 0); 604 brelse(epos.bh); 605 if (err < 0) { 606 udf_free_blocks(sb, inode, &eloc, 0, 1); 607 goto out_no_entry; 608 } 609 610 block = udf_get_pblock(sb, block, 611 iinfo->i_location.partitionReferenceNum, 612 0); 613 epos.bh = sb_getblk(sb, block); 614 if (unlikely(!epos.bh)) { 615 err = -ENOMEM; 616 udf_free_blocks(sb, inode, &eloc, 0, 1); 617 goto out_no_entry; 618 } 619 lock_buffer(epos.bh); 620 memset(epos.bh->b_data, 0x00, bsize); 621 set_buffer_uptodate(epos.bh); 622 unlock_buffer(epos.bh); 623 mark_buffer_dirty_inode(epos.bh, inode); 624 ea = epos.bh->b_data + udf_ext0_offset(inode); 625 } else 626 ea = iinfo->i_data + iinfo->i_lenEAttr; 627 628 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 629 pc = (struct pathComponent *)ea; 630 631 if (*symname == '/') { 632 do { 633 symname++; 634 } while (*symname == '/'); 635 636 pc->componentType = 1; 637 pc->lengthComponentIdent = 0; 638 pc->componentFileVersionNum = 0; 639 elen += sizeof(struct pathComponent); 640 } 641 642 err = -ENAMETOOLONG; 643 644 while (*symname) { 645 if (elen + sizeof(struct pathComponent) > eoffset) 646 goto out_no_entry; 647 648 pc = (struct pathComponent *)(ea + elen); 649 650 compstart = symname; 651 652 do { 653 symname++; 654 } while (*symname && *symname != '/'); 655 656 pc->componentType = 5; 657 pc->lengthComponentIdent = 0; 658 pc->componentFileVersionNum = 0; 659 if (compstart[0] == '.') { 660 if ((symname - compstart) == 1) 661 pc->componentType = 4; 662 else if ((symname - compstart) == 2 && 663 compstart[1] == '.') 664 pc->componentType = 3; 665 } 666 667 if (pc->componentType == 5) { 668 namelen = udf_put_filename(sb, compstart, 669 symname - compstart, 670 name, UDF_NAME_LEN_CS0); 671 if (!namelen) 672 goto out_no_entry; 673 674 if (elen + sizeof(struct pathComponent) + namelen > 675 eoffset) 676 goto out_no_entry; 677 else 678 pc->lengthComponentIdent = namelen; 679 680 memcpy(pc->componentIdent, name, namelen); 681 } 682 683 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 684 685 if (*symname) { 686 do { 687 symname++; 688 } while (*symname == '/'); 689 } 690 } 691 692 brelse(epos.bh); 693 inode->i_size = elen; 694 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 695 iinfo->i_lenAlloc = inode->i_size; 696 else 697 udf_truncate_tail_extent(inode); 698 mark_inode_dirty(inode); 699 up_write(&iinfo->i_data_sem); 700 701 err = udf_add_nondir(dentry, inode); 702 out: 703 kfree(name); 704 return err; 705 706 out_no_entry: 707 up_write(&iinfo->i_data_sem); 708 inode_dec_link_count(inode); 709 discard_new_inode(inode); 710 goto out; 711 } 712 713 static int udf_link(struct dentry *old_dentry, struct inode *dir, 714 struct dentry *dentry) 715 { 716 struct inode *inode = d_inode(old_dentry); 717 struct udf_fileident_iter iter; 718 int err; 719 720 err = udf_fiiter_add_entry(dir, dentry, &iter); 721 if (err) 722 return err; 723 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 724 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 725 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 726 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 727 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 728 } 729 udf_fiiter_write_fi(&iter, NULL); 730 udf_fiiter_release(&iter); 731 732 inc_nlink(inode); 733 inode->i_ctime = current_time(inode); 734 mark_inode_dirty(inode); 735 dir->i_ctime = dir->i_mtime = current_time(dir); 736 mark_inode_dirty(dir); 737 ihold(inode); 738 d_instantiate(dentry, inode); 739 740 return 0; 741 } 742 743 /* Anybody can rename anything with this: the permission checks are left to the 744 * higher-level routines. 745 */ 746 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 747 struct dentry *old_dentry, struct inode *new_dir, 748 struct dentry *new_dentry, unsigned int flags) 749 { 750 struct inode *old_inode = d_inode(old_dentry); 751 struct inode *new_inode = d_inode(new_dentry); 752 struct udf_fileident_iter oiter, niter, diriter; 753 bool has_diriter = false; 754 int retval; 755 struct kernel_lb_addr tloc; 756 757 if (flags & ~RENAME_NOREPLACE) 758 return -EINVAL; 759 760 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 761 if (retval) 762 return retval; 763 764 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 765 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 766 retval = -ENOENT; 767 goto out_oiter; 768 } 769 770 if (S_ISDIR(old_inode->i_mode)) { 771 if (new_inode) { 772 retval = -ENOTEMPTY; 773 if (!empty_dir(new_inode)) 774 goto out_oiter; 775 } 776 /* 777 * We need to protect against old_inode getting converted from 778 * ICB to normal directory. 779 */ 780 inode_lock_nested(old_inode, I_MUTEX_NONDIR2); 781 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 782 &diriter); 783 if (retval == -ENOENT) { 784 udf_err(old_inode->i_sb, 785 "directory (ino %lu) has no '..' entry\n", 786 old_inode->i_ino); 787 retval = -EFSCORRUPTED; 788 } 789 if (retval) { 790 inode_unlock(old_inode); 791 goto out_oiter; 792 } 793 has_diriter = true; 794 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 795 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 796 old_dir->i_ino) { 797 retval = -EFSCORRUPTED; 798 udf_err(old_inode->i_sb, 799 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 800 old_inode->i_ino, old_dir->i_ino, 801 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 802 goto out_oiter; 803 } 804 } 805 806 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 807 if (retval && retval != -ENOENT) 808 goto out_oiter; 809 /* Entry found but not passed by VFS? */ 810 if (!retval && !new_inode) { 811 retval = -EFSCORRUPTED; 812 udf_fiiter_release(&niter); 813 goto out_oiter; 814 } 815 /* Entry not found? Need to add one... */ 816 if (retval) { 817 udf_fiiter_release(&niter); 818 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 819 if (retval) 820 goto out_oiter; 821 } 822 823 /* 824 * Like most other Unix systems, set the ctime for inodes on a 825 * rename. 826 */ 827 old_inode->i_ctime = current_time(old_inode); 828 mark_inode_dirty(old_inode); 829 830 /* 831 * ok, that's it 832 */ 833 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 834 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 835 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 836 udf_fiiter_write_fi(&niter, NULL); 837 udf_fiiter_release(&niter); 838 839 /* 840 * The old entry may have moved due to new entry allocation. Find it 841 * again. 842 */ 843 udf_fiiter_release(&oiter); 844 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 845 if (retval) { 846 udf_err(old_dir->i_sb, 847 "failed to find renamed entry again in directory (ino %lu)\n", 848 old_dir->i_ino); 849 } else { 850 udf_fiiter_delete_entry(&oiter); 851 udf_fiiter_release(&oiter); 852 } 853 854 if (new_inode) { 855 new_inode->i_ctime = current_time(new_inode); 856 inode_dec_link_count(new_inode); 857 } 858 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 859 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 860 mark_inode_dirty(old_dir); 861 mark_inode_dirty(new_dir); 862 863 if (has_diriter) { 864 diriter.fi.icb.extLocation = 865 cpu_to_lelb(UDF_I(new_dir)->i_location); 866 udf_update_tag((char *)&diriter.fi, 867 udf_dir_entry_len(&diriter.fi)); 868 udf_fiiter_write_fi(&diriter, NULL); 869 udf_fiiter_release(&diriter); 870 inode_unlock(old_inode); 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 inode_unlock(old_inode); 885 } 886 udf_fiiter_release(&oiter); 887 888 return retval; 889 } 890 891 static struct dentry *udf_get_parent(struct dentry *child) 892 { 893 struct kernel_lb_addr tloc; 894 struct inode *inode = NULL; 895 struct udf_fileident_iter iter; 896 int err; 897 898 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 899 if (err) 900 return ERR_PTR(err); 901 902 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 903 udf_fiiter_release(&iter); 904 inode = udf_iget(child->d_sb, &tloc); 905 if (IS_ERR(inode)) 906 return ERR_CAST(inode); 907 908 return d_obtain_alias(inode); 909 } 910 911 912 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 913 u16 partref, __u32 generation) 914 { 915 struct inode *inode; 916 struct kernel_lb_addr loc; 917 918 if (block == 0) 919 return ERR_PTR(-ESTALE); 920 921 loc.logicalBlockNum = block; 922 loc.partitionReferenceNum = partref; 923 inode = udf_iget(sb, &loc); 924 925 if (IS_ERR(inode)) 926 return ERR_CAST(inode); 927 928 if (generation && inode->i_generation != generation) { 929 iput(inode); 930 return ERR_PTR(-ESTALE); 931 } 932 return d_obtain_alias(inode); 933 } 934 935 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 936 struct fid *fid, int fh_len, int fh_type) 937 { 938 if (fh_len < 3 || 939 (fh_type != FILEID_UDF_WITH_PARENT && 940 fh_type != FILEID_UDF_WITHOUT_PARENT)) 941 return NULL; 942 943 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 944 fid->udf.generation); 945 } 946 947 static struct dentry *udf_fh_to_parent(struct super_block *sb, 948 struct fid *fid, int fh_len, int fh_type) 949 { 950 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 951 return NULL; 952 953 return udf_nfs_get_inode(sb, fid->udf.parent_block, 954 fid->udf.parent_partref, 955 fid->udf.parent_generation); 956 } 957 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 958 struct inode *parent) 959 { 960 int len = *lenp; 961 struct kernel_lb_addr location = UDF_I(inode)->i_location; 962 struct fid *fid = (struct fid *)fh; 963 int type = FILEID_UDF_WITHOUT_PARENT; 964 965 if (parent && (len < 5)) { 966 *lenp = 5; 967 return FILEID_INVALID; 968 } else if (len < 3) { 969 *lenp = 3; 970 return FILEID_INVALID; 971 } 972 973 *lenp = 3; 974 fid->udf.block = location.logicalBlockNum; 975 fid->udf.partref = location.partitionReferenceNum; 976 fid->udf.parent_partref = 0; 977 fid->udf.generation = inode->i_generation; 978 979 if (parent) { 980 location = UDF_I(parent)->i_location; 981 fid->udf.parent_block = location.logicalBlockNum; 982 fid->udf.parent_partref = location.partitionReferenceNum; 983 fid->udf.parent_generation = inode->i_generation; 984 *lenp = 5; 985 type = FILEID_UDF_WITH_PARENT; 986 } 987 988 return type; 989 } 990 991 const struct export_operations udf_export_ops = { 992 .encode_fh = udf_encode_fh, 993 .fh_to_dentry = udf_fh_to_dentry, 994 .fh_to_parent = udf_fh_to_parent, 995 .get_parent = udf_get_parent, 996 }; 997 998 const struct inode_operations udf_dir_inode_operations = { 999 .lookup = udf_lookup, 1000 .create = udf_create, 1001 .link = udf_link, 1002 .unlink = udf_unlink, 1003 .symlink = udf_symlink, 1004 .mkdir = udf_mkdir, 1005 .rmdir = udf_rmdir, 1006 .mknod = udf_mknod, 1007 .rename = udf_rename, 1008 .tmpfile = udf_tmpfile, 1009 }; 1010