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 void udf_add_fid_counter(struct super_block *sb, bool dir, int val) 340 { 341 struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb); 342 343 if (!lvidiu) 344 return; 345 mutex_lock(&UDF_SB(sb)->s_alloc_mutex); 346 if (dir) 347 le32_add_cpu(&lvidiu->numDirs, val); 348 else 349 le32_add_cpu(&lvidiu->numFiles, val); 350 udf_updated_lvid(sb); 351 mutex_unlock(&UDF_SB(sb)->s_alloc_mutex); 352 } 353 354 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 355 { 356 struct udf_inode_info *iinfo = UDF_I(inode); 357 struct inode *dir = d_inode(dentry->d_parent); 358 struct udf_fileident_iter iter; 359 int err; 360 361 err = udf_fiiter_add_entry(dir, dentry, &iter); 362 if (err) { 363 inode_dec_link_count(inode); 364 discard_new_inode(inode); 365 return err; 366 } 367 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 368 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 369 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 370 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 371 udf_fiiter_write_fi(&iter, NULL); 372 dir->i_ctime = dir->i_mtime = current_time(dir); 373 mark_inode_dirty(dir); 374 udf_fiiter_release(&iter); 375 udf_add_fid_counter(dir->i_sb, false, 1); 376 d_instantiate_new(dentry, inode); 377 378 return 0; 379 } 380 381 static int udf_create(struct mnt_idmap *idmap, struct inode *dir, 382 struct dentry *dentry, umode_t mode, bool excl) 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); 393 394 return udf_add_nondir(dentry, inode); 395 } 396 397 static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir, 398 struct file *file, umode_t mode) 399 { 400 struct inode *inode = udf_new_inode(dir, mode); 401 402 if (IS_ERR(inode)) 403 return PTR_ERR(inode); 404 405 inode->i_data.a_ops = &udf_aops; 406 inode->i_op = &udf_file_inode_operations; 407 inode->i_fop = &udf_file_operations; 408 mark_inode_dirty(inode); 409 d_tmpfile(file, inode); 410 unlock_new_inode(inode); 411 return finish_open_simple(file, 0); 412 } 413 414 static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir, 415 struct dentry *dentry, umode_t mode, dev_t rdev) 416 { 417 struct inode *inode; 418 419 if (!old_valid_dev(rdev)) 420 return -EINVAL; 421 422 inode = udf_new_inode(dir, mode); 423 if (IS_ERR(inode)) 424 return PTR_ERR(inode); 425 426 init_special_inode(inode, mode, rdev); 427 return udf_add_nondir(dentry, inode); 428 } 429 430 static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir, 431 struct dentry *dentry, umode_t mode) 432 { 433 struct inode *inode; 434 struct udf_fileident_iter iter; 435 int err; 436 struct udf_inode_info *dinfo = UDF_I(dir); 437 struct udf_inode_info *iinfo; 438 439 inode = udf_new_inode(dir, S_IFDIR | mode); 440 if (IS_ERR(inode)) 441 return PTR_ERR(inode); 442 443 iinfo = UDF_I(inode); 444 inode->i_op = &udf_dir_inode_operations; 445 inode->i_fop = &udf_dir_operations; 446 err = udf_fiiter_add_entry(inode, NULL, &iter); 447 if (err) { 448 clear_nlink(inode); 449 discard_new_inode(inode); 450 return err; 451 } 452 set_nlink(inode, 2); 453 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 454 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 455 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 456 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 457 iter.fi.fileCharacteristics = 458 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 459 udf_fiiter_write_fi(&iter, NULL); 460 udf_fiiter_release(&iter); 461 mark_inode_dirty(inode); 462 463 err = udf_fiiter_add_entry(dir, dentry, &iter); 464 if (err) { 465 clear_nlink(inode); 466 discard_new_inode(inode); 467 return err; 468 } 469 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 470 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 471 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 472 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 473 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 474 udf_fiiter_write_fi(&iter, NULL); 475 udf_fiiter_release(&iter); 476 udf_add_fid_counter(dir->i_sb, true, 1); 477 inc_nlink(dir); 478 dir->i_ctime = dir->i_mtime = current_time(dir); 479 mark_inode_dirty(dir); 480 d_instantiate_new(dentry, inode); 481 482 return 0; 483 } 484 485 static int empty_dir(struct inode *dir) 486 { 487 struct udf_fileident_iter iter; 488 int ret; 489 490 for (ret = udf_fiiter_init(&iter, dir, 0); 491 !ret && iter.pos < dir->i_size; 492 ret = udf_fiiter_advance(&iter)) { 493 if (iter.fi.lengthFileIdent && 494 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 495 udf_fiiter_release(&iter); 496 return 0; 497 } 498 } 499 udf_fiiter_release(&iter); 500 501 return 1; 502 } 503 504 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 505 { 506 int ret; 507 struct inode *inode = d_inode(dentry); 508 struct udf_fileident_iter iter; 509 struct kernel_lb_addr tloc; 510 511 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 512 if (ret) 513 goto out; 514 515 ret = -EFSCORRUPTED; 516 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 517 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 518 goto end_rmdir; 519 ret = -ENOTEMPTY; 520 if (!empty_dir(inode)) 521 goto end_rmdir; 522 udf_fiiter_delete_entry(&iter); 523 if (inode->i_nlink != 2) 524 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 525 inode->i_nlink); 526 clear_nlink(inode); 527 inode->i_size = 0; 528 inode_dec_link_count(dir); 529 udf_add_fid_counter(dir->i_sb, true, -1); 530 inode->i_ctime = dir->i_ctime = dir->i_mtime = 531 current_time(inode); 532 mark_inode_dirty(dir); 533 ret = 0; 534 end_rmdir: 535 udf_fiiter_release(&iter); 536 out: 537 return ret; 538 } 539 540 static int udf_unlink(struct inode *dir, struct dentry *dentry) 541 { 542 int ret; 543 struct inode *inode = d_inode(dentry); 544 struct udf_fileident_iter iter; 545 struct kernel_lb_addr tloc; 546 547 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 548 if (ret) 549 goto out; 550 551 ret = -EFSCORRUPTED; 552 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 553 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 554 goto end_unlink; 555 556 if (!inode->i_nlink) { 557 udf_debug("Deleting nonexistent file (%lu), %u\n", 558 inode->i_ino, inode->i_nlink); 559 set_nlink(inode, 1); 560 } 561 udf_fiiter_delete_entry(&iter); 562 dir->i_ctime = dir->i_mtime = current_time(dir); 563 mark_inode_dirty(dir); 564 inode_dec_link_count(inode); 565 udf_add_fid_counter(dir->i_sb, false, -1); 566 inode->i_ctime = dir->i_ctime; 567 ret = 0; 568 end_unlink: 569 udf_fiiter_release(&iter); 570 out: 571 return ret; 572 } 573 574 static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir, 575 struct dentry *dentry, const char *symname) 576 { 577 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 578 struct pathComponent *pc; 579 const char *compstart; 580 struct extent_position epos = {}; 581 int eoffset, elen = 0; 582 uint8_t *ea; 583 int err; 584 udf_pblk_t block; 585 unsigned char *name = NULL; 586 int namelen; 587 struct udf_inode_info *iinfo; 588 struct super_block *sb = dir->i_sb; 589 590 if (IS_ERR(inode)) 591 return PTR_ERR(inode); 592 593 iinfo = UDF_I(inode); 594 down_write(&iinfo->i_data_sem); 595 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 596 if (!name) { 597 err = -ENOMEM; 598 goto out_no_entry; 599 } 600 601 inode->i_data.a_ops = &udf_symlink_aops; 602 inode->i_op = &udf_symlink_inode_operations; 603 inode_nohighmem(inode); 604 605 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 606 struct kernel_lb_addr eloc; 607 uint32_t bsize; 608 609 block = udf_new_block(sb, inode, 610 iinfo->i_location.partitionReferenceNum, 611 iinfo->i_location.logicalBlockNum, &err); 612 if (!block) 613 goto out_no_entry; 614 epos.block = iinfo->i_location; 615 epos.offset = udf_file_entry_alloc_offset(inode); 616 epos.bh = NULL; 617 eloc.logicalBlockNum = block; 618 eloc.partitionReferenceNum = 619 iinfo->i_location.partitionReferenceNum; 620 bsize = sb->s_blocksize; 621 iinfo->i_lenExtents = bsize; 622 err = udf_add_aext(inode, &epos, &eloc, bsize, 0); 623 brelse(epos.bh); 624 if (err < 0) { 625 udf_free_blocks(sb, inode, &eloc, 0, 1); 626 goto out_no_entry; 627 } 628 629 block = udf_get_pblock(sb, block, 630 iinfo->i_location.partitionReferenceNum, 631 0); 632 epos.bh = sb_getblk(sb, block); 633 if (unlikely(!epos.bh)) { 634 err = -ENOMEM; 635 udf_free_blocks(sb, inode, &eloc, 0, 1); 636 goto out_no_entry; 637 } 638 lock_buffer(epos.bh); 639 memset(epos.bh->b_data, 0x00, bsize); 640 set_buffer_uptodate(epos.bh); 641 unlock_buffer(epos.bh); 642 mark_buffer_dirty_inode(epos.bh, inode); 643 ea = epos.bh->b_data + udf_ext0_offset(inode); 644 } else 645 ea = iinfo->i_data + iinfo->i_lenEAttr; 646 647 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 648 pc = (struct pathComponent *)ea; 649 650 if (*symname == '/') { 651 do { 652 symname++; 653 } while (*symname == '/'); 654 655 pc->componentType = 1; 656 pc->lengthComponentIdent = 0; 657 pc->componentFileVersionNum = 0; 658 elen += sizeof(struct pathComponent); 659 } 660 661 err = -ENAMETOOLONG; 662 663 while (*symname) { 664 if (elen + sizeof(struct pathComponent) > eoffset) 665 goto out_no_entry; 666 667 pc = (struct pathComponent *)(ea + elen); 668 669 compstart = symname; 670 671 do { 672 symname++; 673 } while (*symname && *symname != '/'); 674 675 pc->componentType = 5; 676 pc->lengthComponentIdent = 0; 677 pc->componentFileVersionNum = 0; 678 if (compstart[0] == '.') { 679 if ((symname - compstart) == 1) 680 pc->componentType = 4; 681 else if ((symname - compstart) == 2 && 682 compstart[1] == '.') 683 pc->componentType = 3; 684 } 685 686 if (pc->componentType == 5) { 687 namelen = udf_put_filename(sb, compstart, 688 symname - compstart, 689 name, UDF_NAME_LEN_CS0); 690 if (!namelen) 691 goto out_no_entry; 692 693 if (elen + sizeof(struct pathComponent) + namelen > 694 eoffset) 695 goto out_no_entry; 696 else 697 pc->lengthComponentIdent = namelen; 698 699 memcpy(pc->componentIdent, name, namelen); 700 } 701 702 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 703 704 if (*symname) { 705 do { 706 symname++; 707 } while (*symname == '/'); 708 } 709 } 710 711 brelse(epos.bh); 712 inode->i_size = elen; 713 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 714 iinfo->i_lenAlloc = inode->i_size; 715 else 716 udf_truncate_tail_extent(inode); 717 mark_inode_dirty(inode); 718 up_write(&iinfo->i_data_sem); 719 720 err = udf_add_nondir(dentry, inode); 721 out: 722 kfree(name); 723 return err; 724 725 out_no_entry: 726 up_write(&iinfo->i_data_sem); 727 inode_dec_link_count(inode); 728 discard_new_inode(inode); 729 goto out; 730 } 731 732 static int udf_link(struct dentry *old_dentry, struct inode *dir, 733 struct dentry *dentry) 734 { 735 struct inode *inode = d_inode(old_dentry); 736 struct udf_fileident_iter iter; 737 int err; 738 739 err = udf_fiiter_add_entry(dir, dentry, &iter); 740 if (err) 741 return err; 742 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 743 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 744 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 745 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 746 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 747 } 748 udf_fiiter_write_fi(&iter, NULL); 749 udf_fiiter_release(&iter); 750 751 inc_nlink(inode); 752 udf_add_fid_counter(dir->i_sb, false, 1); 753 inode->i_ctime = current_time(inode); 754 mark_inode_dirty(inode); 755 dir->i_ctime = dir->i_mtime = current_time(dir); 756 mark_inode_dirty(dir); 757 ihold(inode); 758 d_instantiate(dentry, inode); 759 760 return 0; 761 } 762 763 /* Anybody can rename anything with this: the permission checks are left to the 764 * higher-level routines. 765 */ 766 static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, 767 struct dentry *old_dentry, struct inode *new_dir, 768 struct dentry *new_dentry, unsigned int flags) 769 { 770 struct inode *old_inode = d_inode(old_dentry); 771 struct inode *new_inode = d_inode(new_dentry); 772 struct udf_fileident_iter oiter, niter, diriter; 773 bool has_diriter = false; 774 int retval; 775 struct kernel_lb_addr tloc; 776 777 if (flags & ~RENAME_NOREPLACE) 778 return -EINVAL; 779 780 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 781 if (retval) 782 return retval; 783 784 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 785 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 786 retval = -ENOENT; 787 goto out_oiter; 788 } 789 790 if (S_ISDIR(old_inode->i_mode)) { 791 if (new_inode) { 792 retval = -ENOTEMPTY; 793 if (!empty_dir(new_inode)) 794 goto out_oiter; 795 } 796 /* 797 * We need to protect against old_inode getting converted from 798 * ICB to normal directory. 799 */ 800 inode_lock_nested(old_inode, I_MUTEX_NONDIR2); 801 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 802 &diriter); 803 if (retval == -ENOENT) { 804 udf_err(old_inode->i_sb, 805 "directory (ino %lu) has no '..' entry\n", 806 old_inode->i_ino); 807 retval = -EFSCORRUPTED; 808 } 809 if (retval) { 810 inode_unlock(old_inode); 811 goto out_oiter; 812 } 813 has_diriter = true; 814 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 815 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 816 old_dir->i_ino) { 817 retval = -EFSCORRUPTED; 818 udf_err(old_inode->i_sb, 819 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 820 old_inode->i_ino, old_dir->i_ino, 821 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 822 goto out_oiter; 823 } 824 } 825 826 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 827 if (retval && retval != -ENOENT) 828 goto out_oiter; 829 /* Entry found but not passed by VFS? */ 830 if (!retval && !new_inode) { 831 retval = -EFSCORRUPTED; 832 udf_fiiter_release(&niter); 833 goto out_oiter; 834 } 835 /* Entry not found? Need to add one... */ 836 if (retval) { 837 udf_fiiter_release(&niter); 838 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 839 if (retval) 840 goto out_oiter; 841 } 842 843 /* 844 * Like most other Unix systems, set the ctime for inodes on a 845 * rename. 846 */ 847 old_inode->i_ctime = current_time(old_inode); 848 mark_inode_dirty(old_inode); 849 850 /* 851 * ok, that's it 852 */ 853 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 854 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 855 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 856 udf_fiiter_write_fi(&niter, NULL); 857 udf_fiiter_release(&niter); 858 859 /* 860 * The old entry may have moved due to new entry allocation. Find it 861 * again. 862 */ 863 udf_fiiter_release(&oiter); 864 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 865 if (retval) { 866 udf_err(old_dir->i_sb, 867 "failed to find renamed entry again in directory (ino %lu)\n", 868 old_dir->i_ino); 869 } else { 870 udf_fiiter_delete_entry(&oiter); 871 udf_fiiter_release(&oiter); 872 } 873 874 if (new_inode) { 875 new_inode->i_ctime = current_time(new_inode); 876 inode_dec_link_count(new_inode); 877 udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode), 878 -1); 879 } 880 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 881 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 882 mark_inode_dirty(old_dir); 883 mark_inode_dirty(new_dir); 884 885 if (has_diriter) { 886 diriter.fi.icb.extLocation = 887 cpu_to_lelb(UDF_I(new_dir)->i_location); 888 udf_update_tag((char *)&diriter.fi, 889 udf_dir_entry_len(&diriter.fi)); 890 udf_fiiter_write_fi(&diriter, NULL); 891 udf_fiiter_release(&diriter); 892 inode_unlock(old_inode); 893 894 inode_dec_link_count(old_dir); 895 if (new_inode) 896 inode_dec_link_count(new_inode); 897 else { 898 inc_nlink(new_dir); 899 mark_inode_dirty(new_dir); 900 } 901 } 902 return 0; 903 out_oiter: 904 if (has_diriter) { 905 udf_fiiter_release(&diriter); 906 inode_unlock(old_inode); 907 } 908 udf_fiiter_release(&oiter); 909 910 return retval; 911 } 912 913 static struct dentry *udf_get_parent(struct dentry *child) 914 { 915 struct kernel_lb_addr tloc; 916 struct inode *inode = NULL; 917 struct udf_fileident_iter iter; 918 int err; 919 920 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 921 if (err) 922 return ERR_PTR(err); 923 924 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 925 udf_fiiter_release(&iter); 926 inode = udf_iget(child->d_sb, &tloc); 927 if (IS_ERR(inode)) 928 return ERR_CAST(inode); 929 930 return d_obtain_alias(inode); 931 } 932 933 934 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 935 u16 partref, __u32 generation) 936 { 937 struct inode *inode; 938 struct kernel_lb_addr loc; 939 940 if (block == 0) 941 return ERR_PTR(-ESTALE); 942 943 loc.logicalBlockNum = block; 944 loc.partitionReferenceNum = partref; 945 inode = udf_iget(sb, &loc); 946 947 if (IS_ERR(inode)) 948 return ERR_CAST(inode); 949 950 if (generation && inode->i_generation != generation) { 951 iput(inode); 952 return ERR_PTR(-ESTALE); 953 } 954 return d_obtain_alias(inode); 955 } 956 957 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 958 struct fid *fid, int fh_len, int fh_type) 959 { 960 if (fh_len < 3 || 961 (fh_type != FILEID_UDF_WITH_PARENT && 962 fh_type != FILEID_UDF_WITHOUT_PARENT)) 963 return NULL; 964 965 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 966 fid->udf.generation); 967 } 968 969 static struct dentry *udf_fh_to_parent(struct super_block *sb, 970 struct fid *fid, int fh_len, int fh_type) 971 { 972 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 973 return NULL; 974 975 return udf_nfs_get_inode(sb, fid->udf.parent_block, 976 fid->udf.parent_partref, 977 fid->udf.parent_generation); 978 } 979 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 980 struct inode *parent) 981 { 982 int len = *lenp; 983 struct kernel_lb_addr location = UDF_I(inode)->i_location; 984 struct fid *fid = (struct fid *)fh; 985 int type = FILEID_UDF_WITHOUT_PARENT; 986 987 if (parent && (len < 5)) { 988 *lenp = 5; 989 return FILEID_INVALID; 990 } else if (len < 3) { 991 *lenp = 3; 992 return FILEID_INVALID; 993 } 994 995 *lenp = 3; 996 fid->udf.block = location.logicalBlockNum; 997 fid->udf.partref = location.partitionReferenceNum; 998 fid->udf.parent_partref = 0; 999 fid->udf.generation = inode->i_generation; 1000 1001 if (parent) { 1002 location = UDF_I(parent)->i_location; 1003 fid->udf.parent_block = location.logicalBlockNum; 1004 fid->udf.parent_partref = location.partitionReferenceNum; 1005 fid->udf.parent_generation = inode->i_generation; 1006 *lenp = 5; 1007 type = FILEID_UDF_WITH_PARENT; 1008 } 1009 1010 return type; 1011 } 1012 1013 const struct export_operations udf_export_ops = { 1014 .encode_fh = udf_encode_fh, 1015 .fh_to_dentry = udf_fh_to_dentry, 1016 .fh_to_parent = udf_fh_to_parent, 1017 .get_parent = udf_get_parent, 1018 }; 1019 1020 const struct inode_operations udf_dir_inode_operations = { 1021 .lookup = udf_lookup, 1022 .create = udf_create, 1023 .link = udf_link, 1024 .unlink = udf_unlink, 1025 .symlink = udf_symlink, 1026 .mkdir = udf_mkdir, 1027 .rmdir = udf_rmdir, 1028 .mknod = udf_mknod, 1029 .rename = udf_rename, 1030 .tmpfile = udf_tmpfile, 1031 }; 1032