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 = sb_getblk(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 inode->i_data.a_ops = &udf_aops; 381 inode->i_op = &udf_file_inode_operations; 382 inode->i_fop = &udf_file_operations; 383 mark_inode_dirty(inode); 384 385 return udf_add_nondir(dentry, inode); 386 } 387 388 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 389 struct file *file, umode_t mode) 390 { 391 struct inode *inode = udf_new_inode(dir, mode); 392 393 if (IS_ERR(inode)) 394 return PTR_ERR(inode); 395 396 inode->i_data.a_ops = &udf_aops; 397 inode->i_op = &udf_file_inode_operations; 398 inode->i_fop = &udf_file_operations; 399 mark_inode_dirty(inode); 400 d_tmpfile(file, inode); 401 unlock_new_inode(inode); 402 return finish_open_simple(file, 0); 403 } 404 405 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 406 struct dentry *dentry, umode_t mode, dev_t rdev) 407 { 408 struct inode *inode; 409 410 if (!old_valid_dev(rdev)) 411 return -EINVAL; 412 413 inode = udf_new_inode(dir, mode); 414 if (IS_ERR(inode)) 415 return PTR_ERR(inode); 416 417 init_special_inode(inode, mode, rdev); 418 return udf_add_nondir(dentry, inode); 419 } 420 421 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 422 struct dentry *dentry, umode_t mode) 423 { 424 struct inode *inode; 425 struct udf_fileident_iter iter; 426 int err; 427 struct udf_inode_info *dinfo = UDF_I(dir); 428 struct udf_inode_info *iinfo; 429 430 inode = udf_new_inode(dir, S_IFDIR | mode); 431 if (IS_ERR(inode)) 432 return PTR_ERR(inode); 433 434 iinfo = UDF_I(inode); 435 inode->i_op = &udf_dir_inode_operations; 436 inode->i_fop = &udf_dir_operations; 437 err = udf_fiiter_add_entry(inode, NULL, &iter); 438 if (err) { 439 clear_nlink(inode); 440 discard_new_inode(inode); 441 return err; 442 } 443 set_nlink(inode, 2); 444 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 445 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 446 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 447 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 448 iter.fi.fileCharacteristics = 449 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 450 udf_fiiter_write_fi(&iter, NULL); 451 udf_fiiter_release(&iter); 452 mark_inode_dirty(inode); 453 454 err = udf_fiiter_add_entry(dir, dentry, &iter); 455 if (err) { 456 clear_nlink(inode); 457 discard_new_inode(inode); 458 return err; 459 } 460 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 461 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 462 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 463 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 464 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 465 udf_fiiter_write_fi(&iter, NULL); 466 udf_fiiter_release(&iter); 467 inc_nlink(dir); 468 dir->i_ctime = dir->i_mtime = current_time(dir); 469 mark_inode_dirty(dir); 470 d_instantiate_new(dentry, inode); 471 472 return 0; 473 } 474 475 static int empty_dir(struct inode *dir) 476 { 477 struct udf_fileident_iter iter; 478 int ret; 479 480 for (ret = udf_fiiter_init(&iter, dir, 0); 481 !ret && iter.pos < dir->i_size; 482 ret = udf_fiiter_advance(&iter)) { 483 if (iter.fi.lengthFileIdent && 484 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 485 udf_fiiter_release(&iter); 486 return 0; 487 } 488 } 489 udf_fiiter_release(&iter); 490 491 return 1; 492 } 493 494 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 495 { 496 int ret; 497 struct inode *inode = d_inode(dentry); 498 struct udf_fileident_iter iter; 499 struct kernel_lb_addr tloc; 500 501 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 502 if (ret) 503 goto out; 504 505 ret = -EFSCORRUPTED; 506 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 507 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 508 goto end_rmdir; 509 ret = -ENOTEMPTY; 510 if (!empty_dir(inode)) 511 goto end_rmdir; 512 udf_fiiter_delete_entry(&iter); 513 if (inode->i_nlink != 2) 514 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 515 inode->i_nlink); 516 clear_nlink(inode); 517 inode->i_size = 0; 518 inode_dec_link_count(dir); 519 inode->i_ctime = dir->i_ctime = dir->i_mtime = 520 current_time(inode); 521 mark_inode_dirty(dir); 522 ret = 0; 523 end_rmdir: 524 udf_fiiter_release(&iter); 525 out: 526 return ret; 527 } 528 529 static int udf_unlink(struct inode *dir, struct dentry *dentry) 530 { 531 int ret; 532 struct inode *inode = d_inode(dentry); 533 struct udf_fileident_iter iter; 534 struct kernel_lb_addr tloc; 535 536 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 537 if (ret) 538 goto out; 539 540 ret = -EFSCORRUPTED; 541 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 542 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 543 goto end_unlink; 544 545 if (!inode->i_nlink) { 546 udf_debug("Deleting nonexistent file (%lu), %u\n", 547 inode->i_ino, inode->i_nlink); 548 set_nlink(inode, 1); 549 } 550 udf_fiiter_delete_entry(&iter); 551 dir->i_ctime = dir->i_mtime = current_time(dir); 552 mark_inode_dirty(dir); 553 inode_dec_link_count(inode); 554 inode->i_ctime = dir->i_ctime; 555 ret = 0; 556 end_unlink: 557 udf_fiiter_release(&iter); 558 out: 559 return ret; 560 } 561 562 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 563 struct dentry *dentry, const char *symname) 564 { 565 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 566 struct pathComponent *pc; 567 const char *compstart; 568 struct extent_position epos = {}; 569 int eoffset, elen = 0; 570 uint8_t *ea; 571 int err; 572 udf_pblk_t block; 573 unsigned char *name = NULL; 574 int namelen; 575 struct udf_inode_info *iinfo; 576 struct super_block *sb = dir->i_sb; 577 578 if (IS_ERR(inode)) 579 return PTR_ERR(inode); 580 581 iinfo = UDF_I(inode); 582 down_write(&iinfo->i_data_sem); 583 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 584 if (!name) { 585 err = -ENOMEM; 586 goto out_no_entry; 587 } 588 589 inode->i_data.a_ops = &udf_symlink_aops; 590 inode->i_op = &udf_symlink_inode_operations; 591 inode_nohighmem(inode); 592 593 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 594 struct kernel_lb_addr eloc; 595 uint32_t bsize; 596 597 block = udf_new_block(sb, inode, 598 iinfo->i_location.partitionReferenceNum, 599 iinfo->i_location.logicalBlockNum, &err); 600 if (!block) 601 goto out_no_entry; 602 epos.block = iinfo->i_location; 603 epos.offset = udf_file_entry_alloc_offset(inode); 604 epos.bh = NULL; 605 eloc.logicalBlockNum = block; 606 eloc.partitionReferenceNum = 607 iinfo->i_location.partitionReferenceNum; 608 bsize = sb->s_blocksize; 609 iinfo->i_lenExtents = bsize; 610 err = udf_add_aext(inode, &epos, &eloc, bsize, 0); 611 brelse(epos.bh); 612 if (err < 0) { 613 udf_free_blocks(sb, inode, &eloc, 0, 1); 614 goto out_no_entry; 615 } 616 617 block = udf_get_pblock(sb, block, 618 iinfo->i_location.partitionReferenceNum, 619 0); 620 epos.bh = sb_getblk(sb, block); 621 if (unlikely(!epos.bh)) { 622 err = -ENOMEM; 623 udf_free_blocks(sb, inode, &eloc, 0, 1); 624 goto out_no_entry; 625 } 626 lock_buffer(epos.bh); 627 memset(epos.bh->b_data, 0x00, bsize); 628 set_buffer_uptodate(epos.bh); 629 unlock_buffer(epos.bh); 630 mark_buffer_dirty_inode(epos.bh, inode); 631 ea = epos.bh->b_data + udf_ext0_offset(inode); 632 } else 633 ea = iinfo->i_data + iinfo->i_lenEAttr; 634 635 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 636 pc = (struct pathComponent *)ea; 637 638 if (*symname == '/') { 639 do { 640 symname++; 641 } while (*symname == '/'); 642 643 pc->componentType = 1; 644 pc->lengthComponentIdent = 0; 645 pc->componentFileVersionNum = 0; 646 elen += sizeof(struct pathComponent); 647 } 648 649 err = -ENAMETOOLONG; 650 651 while (*symname) { 652 if (elen + sizeof(struct pathComponent) > eoffset) 653 goto out_no_entry; 654 655 pc = (struct pathComponent *)(ea + elen); 656 657 compstart = symname; 658 659 do { 660 symname++; 661 } while (*symname && *symname != '/'); 662 663 pc->componentType = 5; 664 pc->lengthComponentIdent = 0; 665 pc->componentFileVersionNum = 0; 666 if (compstart[0] == '.') { 667 if ((symname - compstart) == 1) 668 pc->componentType = 4; 669 else if ((symname - compstart) == 2 && 670 compstart[1] == '.') 671 pc->componentType = 3; 672 } 673 674 if (pc->componentType == 5) { 675 namelen = udf_put_filename(sb, compstart, 676 symname - compstart, 677 name, UDF_NAME_LEN_CS0); 678 if (!namelen) 679 goto out_no_entry; 680 681 if (elen + sizeof(struct pathComponent) + namelen > 682 eoffset) 683 goto out_no_entry; 684 else 685 pc->lengthComponentIdent = namelen; 686 687 memcpy(pc->componentIdent, name, namelen); 688 } 689 690 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 691 692 if (*symname) { 693 do { 694 symname++; 695 } while (*symname == '/'); 696 } 697 } 698 699 brelse(epos.bh); 700 inode->i_size = elen; 701 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 702 iinfo->i_lenAlloc = inode->i_size; 703 else 704 udf_truncate_tail_extent(inode); 705 mark_inode_dirty(inode); 706 up_write(&iinfo->i_data_sem); 707 708 err = udf_add_nondir(dentry, inode); 709 out: 710 kfree(name); 711 return err; 712 713 out_no_entry: 714 up_write(&iinfo->i_data_sem); 715 inode_dec_link_count(inode); 716 discard_new_inode(inode); 717 goto out; 718 } 719 720 static int udf_link(struct dentry *old_dentry, struct inode *dir, 721 struct dentry *dentry) 722 { 723 struct inode *inode = d_inode(old_dentry); 724 struct udf_fileident_iter iter; 725 int err; 726 727 err = udf_fiiter_add_entry(dir, dentry, &iter); 728 if (err) 729 return err; 730 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 731 iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 732 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 733 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 734 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 735 } 736 udf_fiiter_write_fi(&iter, NULL); 737 udf_fiiter_release(&iter); 738 739 inc_nlink(inode); 740 inode->i_ctime = current_time(inode); 741 mark_inode_dirty(inode); 742 dir->i_ctime = dir->i_mtime = current_time(dir); 743 mark_inode_dirty(dir); 744 ihold(inode); 745 d_instantiate(dentry, inode); 746 747 return 0; 748 } 749 750 /* Anybody can rename anything with this: the permission checks are left to the 751 * higher-level routines. 752 */ 753 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 754 struct dentry *old_dentry, struct inode *new_dir, 755 struct dentry *new_dentry, unsigned int flags) 756 { 757 struct inode *old_inode = d_inode(old_dentry); 758 struct inode *new_inode = d_inode(new_dentry); 759 struct udf_fileident_iter oiter, niter, diriter; 760 bool has_diriter = false; 761 int retval; 762 struct kernel_lb_addr tloc; 763 764 if (flags & ~RENAME_NOREPLACE) 765 return -EINVAL; 766 767 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 768 if (retval) 769 return retval; 770 771 tloc = lelb_to_cpu(oiter.fi.icb.extLocation); 772 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) { 773 retval = -ENOENT; 774 goto out_oiter; 775 } 776 777 if (S_ISDIR(old_inode->i_mode)) { 778 if (new_inode) { 779 retval = -ENOTEMPTY; 780 if (!empty_dir(new_inode)) 781 goto out_oiter; 782 } 783 /* 784 * We need to protect against old_inode getting converted from 785 * ICB to normal directory. 786 */ 787 inode_lock_nested(old_inode, I_MUTEX_NONDIR2); 788 retval = udf_fiiter_find_entry(old_inode, &dotdot_name, 789 &diriter); 790 if (retval == -ENOENT) { 791 udf_err(old_inode->i_sb, 792 "directory (ino %lu) has no '..' entry\n", 793 old_inode->i_ino); 794 retval = -EFSCORRUPTED; 795 } 796 if (retval) { 797 inode_unlock(old_inode); 798 goto out_oiter; 799 } 800 has_diriter = true; 801 tloc = lelb_to_cpu(diriter.fi.icb.extLocation); 802 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 803 old_dir->i_ino) { 804 retval = -EFSCORRUPTED; 805 udf_err(old_inode->i_sb, 806 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n", 807 old_inode->i_ino, old_dir->i_ino, 808 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0)); 809 goto out_oiter; 810 } 811 } 812 813 retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter); 814 if (retval && retval != -ENOENT) 815 goto out_oiter; 816 /* Entry found but not passed by VFS? */ 817 if (!retval && !new_inode) { 818 retval = -EFSCORRUPTED; 819 udf_fiiter_release(&niter); 820 goto out_oiter; 821 } 822 /* Entry not found? Need to add one... */ 823 if (retval) { 824 udf_fiiter_release(&niter); 825 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter); 826 if (retval) 827 goto out_oiter; 828 } 829 830 /* 831 * Like most other Unix systems, set the ctime for inodes on a 832 * rename. 833 */ 834 old_inode->i_ctime = current_time(old_inode); 835 mark_inode_dirty(old_inode); 836 837 /* 838 * ok, that's it 839 */ 840 niter.fi.fileVersionNum = oiter.fi.fileVersionNum; 841 niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics; 842 memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb)); 843 udf_fiiter_write_fi(&niter, NULL); 844 udf_fiiter_release(&niter); 845 846 /* 847 * The old entry may have moved due to new entry allocation. Find it 848 * again. 849 */ 850 udf_fiiter_release(&oiter); 851 retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter); 852 if (retval) { 853 udf_err(old_dir->i_sb, 854 "failed to find renamed entry again in directory (ino %lu)\n", 855 old_dir->i_ino); 856 } else { 857 udf_fiiter_delete_entry(&oiter); 858 udf_fiiter_release(&oiter); 859 } 860 861 if (new_inode) { 862 new_inode->i_ctime = current_time(new_inode); 863 inode_dec_link_count(new_inode); 864 } 865 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 866 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 867 mark_inode_dirty(old_dir); 868 mark_inode_dirty(new_dir); 869 870 if (has_diriter) { 871 diriter.fi.icb.extLocation = 872 cpu_to_lelb(UDF_I(new_dir)->i_location); 873 udf_update_tag((char *)&diriter.fi, 874 udf_dir_entry_len(&diriter.fi)); 875 udf_fiiter_write_fi(&diriter, NULL); 876 udf_fiiter_release(&diriter); 877 inode_unlock(old_inode); 878 879 inode_dec_link_count(old_dir); 880 if (new_inode) 881 inode_dec_link_count(new_inode); 882 else { 883 inc_nlink(new_dir); 884 mark_inode_dirty(new_dir); 885 } 886 } 887 return 0; 888 out_oiter: 889 if (has_diriter) { 890 udf_fiiter_release(&diriter); 891 inode_unlock(old_inode); 892 } 893 udf_fiiter_release(&oiter); 894 895 return retval; 896 } 897 898 static struct dentry *udf_get_parent(struct dentry *child) 899 { 900 struct kernel_lb_addr tloc; 901 struct inode *inode = NULL; 902 struct udf_fileident_iter iter; 903 int err; 904 905 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 906 if (err) 907 return ERR_PTR(err); 908 909 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 910 udf_fiiter_release(&iter); 911 inode = udf_iget(child->d_sb, &tloc); 912 if (IS_ERR(inode)) 913 return ERR_CAST(inode); 914 915 return d_obtain_alias(inode); 916 } 917 918 919 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 920 u16 partref, __u32 generation) 921 { 922 struct inode *inode; 923 struct kernel_lb_addr loc; 924 925 if (block == 0) 926 return ERR_PTR(-ESTALE); 927 928 loc.logicalBlockNum = block; 929 loc.partitionReferenceNum = partref; 930 inode = udf_iget(sb, &loc); 931 932 if (IS_ERR(inode)) 933 return ERR_CAST(inode); 934 935 if (generation && inode->i_generation != generation) { 936 iput(inode); 937 return ERR_PTR(-ESTALE); 938 } 939 return d_obtain_alias(inode); 940 } 941 942 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 943 struct fid *fid, int fh_len, int fh_type) 944 { 945 if (fh_len < 3 || 946 (fh_type != FILEID_UDF_WITH_PARENT && 947 fh_type != FILEID_UDF_WITHOUT_PARENT)) 948 return NULL; 949 950 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 951 fid->udf.generation); 952 } 953 954 static struct dentry *udf_fh_to_parent(struct super_block *sb, 955 struct fid *fid, int fh_len, int fh_type) 956 { 957 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 958 return NULL; 959 960 return udf_nfs_get_inode(sb, fid->udf.parent_block, 961 fid->udf.parent_partref, 962 fid->udf.parent_generation); 963 } 964 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 965 struct inode *parent) 966 { 967 int len = *lenp; 968 struct kernel_lb_addr location = UDF_I(inode)->i_location; 969 struct fid *fid = (struct fid *)fh; 970 int type = FILEID_UDF_WITHOUT_PARENT; 971 972 if (parent && (len < 5)) { 973 *lenp = 5; 974 return FILEID_INVALID; 975 } else if (len < 3) { 976 *lenp = 3; 977 return FILEID_INVALID; 978 } 979 980 *lenp = 3; 981 fid->udf.block = location.logicalBlockNum; 982 fid->udf.partref = location.partitionReferenceNum; 983 fid->udf.parent_partref = 0; 984 fid->udf.generation = inode->i_generation; 985 986 if (parent) { 987 location = UDF_I(parent)->i_location; 988 fid->udf.parent_block = location.logicalBlockNum; 989 fid->udf.parent_partref = location.partitionReferenceNum; 990 fid->udf.parent_generation = inode->i_generation; 991 *lenp = 5; 992 type = FILEID_UDF_WITH_PARENT; 993 } 994 995 return type; 996 } 997 998 const struct export_operations udf_export_ops = { 999 .encode_fh = udf_encode_fh, 1000 .fh_to_dentry = udf_fh_to_dentry, 1001 .fh_to_parent = udf_fh_to_parent, 1002 .get_parent = udf_get_parent, 1003 }; 1004 1005 const struct inode_operations udf_dir_inode_operations = { 1006 .lookup = udf_lookup, 1007 .create = udf_create, 1008 .link = udf_link, 1009 .unlink = udf_unlink, 1010 .symlink = udf_symlink, 1011 .mkdir = udf_mkdir, 1012 .rmdir = udf_rmdir, 1013 .mknod = udf_mknod, 1014 .rename = udf_rename, 1015 .tmpfile = udf_tmpfile, 1016 }; 1017