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 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, 45 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, 46 uint8_t *impuse, uint8_t *fileident) 47 { 48 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag); 49 uint16_t crc; 50 int offset; 51 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); 52 uint8_t lfi = cfi->lengthFileIdent; 53 int padlen = fibh->eoffset - fibh->soffset - liu - lfi - 54 sizeof(struct fileIdentDesc); 55 int adinicb = 0; 56 57 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 58 adinicb = 1; 59 60 offset = fibh->soffset + sizeof(struct fileIdentDesc); 61 62 if (impuse) { 63 if (adinicb || (offset + liu < 0)) { 64 memcpy((uint8_t *)sfi->impUse, impuse, liu); 65 } else if (offset >= 0) { 66 memcpy(fibh->ebh->b_data + offset, impuse, liu); 67 } else { 68 memcpy((uint8_t *)sfi->impUse, impuse, -offset); 69 memcpy(fibh->ebh->b_data, impuse - offset, 70 liu + offset); 71 } 72 } 73 74 offset += liu; 75 76 if (fileident) { 77 if (adinicb || (offset + lfi < 0)) { 78 memcpy(sfi->impUse + liu, fileident, lfi); 79 } else if (offset >= 0) { 80 memcpy(fibh->ebh->b_data + offset, fileident, lfi); 81 } else { 82 memcpy(sfi->impUse + liu, fileident, -offset); 83 memcpy(fibh->ebh->b_data, fileident - offset, 84 lfi + offset); 85 } 86 } 87 88 offset += lfi; 89 90 if (adinicb || (offset + padlen < 0)) { 91 memset(sfi->impUse + liu + lfi, 0x00, padlen); 92 } else if (offset >= 0) { 93 memset(fibh->ebh->b_data + offset, 0x00, padlen); 94 } else { 95 memset(sfi->impUse + liu + lfi, 0x00, -offset); 96 memset(fibh->ebh->b_data, 0x00, padlen + offset); 97 } 98 99 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag), 100 sizeof(struct fileIdentDesc) - sizeof(struct tag)); 101 102 if (fibh->sbh == fibh->ebh) { 103 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 104 crclen + sizeof(struct tag) - 105 sizeof(struct fileIdentDesc)); 106 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { 107 crc = crc_itu_t(crc, fibh->ebh->b_data + 108 sizeof(struct fileIdentDesc) + 109 fibh->soffset, 110 crclen + sizeof(struct tag) - 111 sizeof(struct fileIdentDesc)); 112 } else { 113 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 114 -fibh->soffset - sizeof(struct fileIdentDesc)); 115 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); 116 } 117 118 cfi->descTag.descCRC = cpu_to_le16(crc); 119 cfi->descTag.descCRCLength = cpu_to_le16(crclen); 120 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); 121 122 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { 123 memcpy((uint8_t *)sfi, (uint8_t *)cfi, 124 sizeof(struct fileIdentDesc)); 125 } else { 126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); 127 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, 128 sizeof(struct fileIdentDesc) + fibh->soffset); 129 } 130 131 if (adinicb) { 132 mark_inode_dirty(inode); 133 } else { 134 if (fibh->sbh != fibh->ebh) 135 mark_buffer_dirty_inode(fibh->ebh, inode); 136 mark_buffer_dirty_inode(fibh->sbh, inode); 137 } 138 inode_inc_iversion(inode); 139 140 return 0; 141 } 142 143 /** 144 * udf_fiiter_find_entry - find entry in given directory. 145 * 146 * @dir: directory inode to search in 147 * @child: qstr of the name 148 * @iter: iter to use for searching 149 * 150 * This function searches in the directory @dir for a file name @child. When 151 * found, @iter points to the position in the directory with given entry. 152 * 153 * Returns 0 on success, < 0 on error (including -ENOENT). 154 */ 155 static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child, 156 struct udf_fileident_iter *iter) 157 { 158 int flen; 159 unsigned char *fname = NULL; 160 struct super_block *sb = dir->i_sb; 161 int isdotdot = child->len == 2 && 162 child->name[0] == '.' && child->name[1] == '.'; 163 int ret; 164 165 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 166 if (!fname) 167 return -ENOMEM; 168 169 for (ret = udf_fiiter_init(iter, dir, 0); 170 !ret && iter->pos < dir->i_size; 171 ret = udf_fiiter_advance(iter)) { 172 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 173 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 174 continue; 175 } 176 177 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) { 178 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 179 continue; 180 } 181 182 if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) && 183 isdotdot) 184 goto out_ok; 185 186 if (!iter->fi.lengthFileIdent) 187 continue; 188 189 flen = udf_get_filename(sb, iter->name, 190 iter->fi.lengthFileIdent, fname, UDF_NAME_LEN); 191 if (flen < 0) { 192 ret = flen; 193 goto out_err; 194 } 195 196 if (udf_match(flen, fname, child->len, child->name)) 197 goto out_ok; 198 } 199 if (!ret) 200 ret = -ENOENT; 201 202 out_err: 203 udf_fiiter_release(iter); 204 out_ok: 205 kfree(fname); 206 207 return ret; 208 } 209 210 /** 211 * udf_find_entry - find entry in given directory. 212 * 213 * @dir: directory inode to search in 214 * @child: qstr of the name 215 * @fibh: buffer head / inode with file identifier descriptor we found 216 * @cfi: found file identifier descriptor with given name 217 * 218 * This function searches in the directory @dir for a file name @child. When 219 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB 220 * directories) containing the file identifier descriptor (FID). In that case 221 * the function returns pointer to the FID in the buffer or inode - but note 222 * that FID may be split among two buffers (blocks) so accessing it via that 223 * pointer isn't easily possible. This pointer can be used only as an iterator 224 * for other directory manipulation functions. For inspection of the FID @cfi 225 * can be used - the found FID is copied there. 226 * 227 * Returns pointer to FID, NULL when nothing found, or error code. 228 */ 229 static struct fileIdentDesc *udf_find_entry(struct inode *dir, 230 const struct qstr *child, 231 struct udf_fileident_bh *fibh, 232 struct fileIdentDesc *cfi) 233 { 234 struct fileIdentDesc *fi = NULL; 235 loff_t f_pos; 236 udf_pblk_t block; 237 int flen; 238 unsigned char *fname = NULL, *copy_name = NULL; 239 unsigned char *nameptr; 240 uint8_t lfi; 241 uint16_t liu; 242 loff_t size; 243 struct kernel_lb_addr eloc; 244 uint32_t elen; 245 sector_t offset; 246 struct extent_position epos = {}; 247 struct udf_inode_info *dinfo = UDF_I(dir); 248 int isdotdot = child->len == 2 && 249 child->name[0] == '.' && child->name[1] == '.'; 250 struct super_block *sb = dir->i_sb; 251 252 size = udf_ext0_offset(dir) + dir->i_size; 253 f_pos = udf_ext0_offset(dir); 254 255 fibh->sbh = fibh->ebh = NULL; 256 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); 257 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 258 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, 259 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 260 fi = ERR_PTR(-EIO); 261 goto out_err; 262 } 263 264 block = udf_get_lb_pblock(sb, &eloc, offset); 265 if ((++offset << sb->s_blocksize_bits) < elen) { 266 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 267 epos.offset -= sizeof(struct short_ad); 268 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 269 epos.offset -= sizeof(struct long_ad); 270 } else 271 offset = 0; 272 273 fibh->sbh = fibh->ebh = udf_tread(sb, block); 274 if (!fibh->sbh) { 275 fi = ERR_PTR(-EIO); 276 goto out_err; 277 } 278 } 279 280 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 281 if (!fname) { 282 fi = ERR_PTR(-ENOMEM); 283 goto out_err; 284 } 285 286 while (f_pos < size) { 287 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 288 &elen, &offset); 289 if (!fi) { 290 fi = ERR_PTR(-EIO); 291 goto out_err; 292 } 293 294 liu = le16_to_cpu(cfi->lengthOfImpUse); 295 lfi = cfi->lengthFileIdent; 296 297 if (fibh->sbh == fibh->ebh) { 298 nameptr = udf_get_fi_ident(fi); 299 } else { 300 int poffset; /* Unpaded ending offset */ 301 302 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + 303 liu + lfi; 304 305 if (poffset >= lfi) 306 nameptr = (uint8_t *)(fibh->ebh->b_data + 307 poffset - lfi); 308 else { 309 if (!copy_name) { 310 copy_name = kmalloc(UDF_NAME_LEN_CS0, 311 GFP_NOFS); 312 if (!copy_name) { 313 fi = ERR_PTR(-ENOMEM); 314 goto out_err; 315 } 316 } 317 nameptr = copy_name; 318 memcpy(nameptr, udf_get_fi_ident(fi), 319 lfi - poffset); 320 memcpy(nameptr + lfi - poffset, 321 fibh->ebh->b_data, poffset); 322 } 323 } 324 325 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 326 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 327 continue; 328 } 329 330 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { 331 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 332 continue; 333 } 334 335 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && 336 isdotdot) 337 goto out_ok; 338 339 if (!lfi) 340 continue; 341 342 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); 343 if (flen < 0) { 344 fi = ERR_PTR(flen); 345 goto out_err; 346 } 347 348 if (udf_match(flen, fname, child->len, child->name)) 349 goto out_ok; 350 } 351 352 fi = NULL; 353 out_err: 354 if (fibh->sbh != fibh->ebh) 355 brelse(fibh->ebh); 356 brelse(fibh->sbh); 357 out_ok: 358 brelse(epos.bh); 359 kfree(fname); 360 kfree(copy_name); 361 362 return fi; 363 } 364 365 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 366 unsigned int flags) 367 { 368 struct inode *inode = NULL; 369 struct udf_fileident_iter iter; 370 int err; 371 372 if (dentry->d_name.len > UDF_NAME_LEN) 373 return ERR_PTR(-ENAMETOOLONG); 374 375 err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 376 if (err < 0 && err != -ENOENT) 377 return ERR_PTR(err); 378 379 if (err == 0) { 380 struct kernel_lb_addr loc; 381 382 loc = lelb_to_cpu(iter.fi.icb.extLocation); 383 udf_fiiter_release(&iter); 384 385 inode = udf_iget(dir->i_sb, &loc); 386 if (IS_ERR(inode)) 387 return ERR_CAST(inode); 388 } 389 390 return d_splice_alias(inode, dentry); 391 } 392 393 static struct buffer_head *udf_expand_dir_adinicb(struct inode *inode, 394 udf_pblk_t *block, int *err) 395 { 396 udf_pblk_t newblock; 397 struct buffer_head *dbh = NULL; 398 struct kernel_lb_addr eloc; 399 struct extent_position epos; 400 uint8_t alloctype; 401 struct udf_inode_info *iinfo = UDF_I(inode); 402 struct udf_fileident_iter iter; 403 uint8_t *impuse; 404 int ret; 405 406 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD)) 407 alloctype = ICBTAG_FLAG_AD_SHORT; 408 else 409 alloctype = ICBTAG_FLAG_AD_LONG; 410 411 if (!inode->i_size) { 412 iinfo->i_alloc_type = alloctype; 413 mark_inode_dirty(inode); 414 return NULL; 415 } 416 417 /* alloc block, and copy data to it */ 418 *block = udf_new_block(inode->i_sb, inode, 419 iinfo->i_location.partitionReferenceNum, 420 iinfo->i_location.logicalBlockNum, err); 421 if (!(*block)) 422 return NULL; 423 newblock = udf_get_pblock(inode->i_sb, *block, 424 iinfo->i_location.partitionReferenceNum, 425 0); 426 if (!newblock) 427 return NULL; 428 dbh = udf_tgetblk(inode->i_sb, newblock); 429 if (!dbh) 430 return NULL; 431 lock_buffer(dbh); 432 memcpy(dbh->b_data, iinfo->i_data, inode->i_size); 433 memset(dbh->b_data + inode->i_size, 0, 434 inode->i_sb->s_blocksize - inode->i_size); 435 set_buffer_uptodate(dbh); 436 unlock_buffer(dbh); 437 438 /* Drop inline data, add block instead */ 439 iinfo->i_alloc_type = alloctype; 440 memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc); 441 iinfo->i_lenAlloc = 0; 442 eloc.logicalBlockNum = *block; 443 eloc.partitionReferenceNum = 444 iinfo->i_location.partitionReferenceNum; 445 iinfo->i_lenExtents = inode->i_size; 446 epos.bh = NULL; 447 epos.block = iinfo->i_location; 448 epos.offset = udf_file_entry_alloc_offset(inode); 449 udf_add_aext(inode, &epos, &eloc, inode->i_size, 0); 450 brelse(epos.bh); 451 mark_inode_dirty(inode); 452 453 /* Now fixup tags in moved directory entries */ 454 for (ret = udf_fiiter_init(&iter, inode, 0); 455 !ret && iter.pos < inode->i_size; 456 ret = udf_fiiter_advance(&iter)) { 457 iter.fi.descTag.tagLocation = cpu_to_le32(*block); 458 if (iter.fi.lengthOfImpUse != cpu_to_le16(0)) 459 impuse = dbh->b_data + iter.pos + 460 sizeof(struct fileIdentDesc); 461 else 462 impuse = NULL; 463 udf_fiiter_write_fi(&iter, impuse); 464 } 465 /* 466 * We don't expect the iteration to fail as the directory has been 467 * already verified to be correct 468 */ 469 WARN_ON_ONCE(ret); 470 udf_fiiter_release(&iter); 471 472 return dbh; 473 } 474 475 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry, 476 struct udf_fileident_iter *iter) 477 { 478 struct udf_inode_info *dinfo = UDF_I(dir); 479 int nfidlen, namelen = 0; 480 int ret; 481 int off, blksize = 1 << dir->i_blkbits; 482 udf_pblk_t block; 483 char name[UDF_NAME_LEN_CS0]; 484 485 if (dentry) { 486 if (!dentry->d_name.len) 487 return -EINVAL; 488 namelen = udf_put_filename(dir->i_sb, dentry->d_name.name, 489 dentry->d_name.len, 490 name, UDF_NAME_LEN_CS0); 491 if (!namelen) 492 return -ENAMETOOLONG; 493 } 494 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 495 496 for (ret = udf_fiiter_init(iter, dir, 0); 497 !ret && iter->pos < dir->i_size; 498 ret = udf_fiiter_advance(iter)) { 499 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) { 500 if (udf_dir_entry_len(&iter->fi) == nfidlen) { 501 iter->fi.descTag.tagSerialNum = cpu_to_le16(1); 502 iter->fi.fileVersionNum = cpu_to_le16(1); 503 iter->fi.fileCharacteristics = 0; 504 iter->fi.lengthFileIdent = namelen; 505 iter->fi.lengthOfImpUse = cpu_to_le16(0); 506 memcpy(iter->namebuf, name, namelen); 507 iter->name = iter->namebuf; 508 return 0; 509 } 510 } 511 } 512 if (ret) { 513 udf_fiiter_release(iter); 514 return ret; 515 } 516 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 517 blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) { 518 struct buffer_head *retbh; 519 520 udf_fiiter_release(iter); 521 /* 522 * FIXME: udf_expand_dir_adinicb does not need to return bh 523 * once other users are gone 524 */ 525 retbh = udf_expand_dir_adinicb(dir, &block, &ret); 526 if (!retbh) 527 return ret; 528 brelse(retbh); 529 ret = udf_fiiter_init(iter, dir, dir->i_size); 530 if (ret < 0) 531 return ret; 532 } 533 534 /* Get blocknumber to use for entry tag */ 535 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 536 block = dinfo->i_location.logicalBlockNum; 537 } else { 538 block = iter->eloc.logicalBlockNum + 539 ((iter->elen - 1) >> dir->i_blkbits); 540 } 541 off = iter->pos & (blksize - 1); 542 if (!off) 543 off = blksize; 544 /* Entry fits into current block? */ 545 if (blksize - udf_ext0_offset(dir) - off >= nfidlen) 546 goto store_fi; 547 548 ret = udf_fiiter_append_blk(iter); 549 if (ret) { 550 udf_fiiter_release(iter); 551 return ret; 552 } 553 554 /* Entry will be completely in the new block? Update tag location... */ 555 if (!(iter->pos & (blksize - 1))) 556 block = iter->eloc.logicalBlockNum + 557 ((iter->elen - 1) >> dir->i_blkbits); 558 store_fi: 559 memset(&iter->fi, 0, sizeof(struct fileIdentDesc)); 560 if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200) 561 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block, 562 sizeof(struct tag)); 563 else 564 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block, 565 sizeof(struct tag)); 566 iter->fi.fileVersionNum = cpu_to_le16(1); 567 iter->fi.lengthFileIdent = namelen; 568 iter->fi.lengthOfImpUse = cpu_to_le16(0); 569 memcpy(iter->namebuf, name, namelen); 570 iter->name = iter->namebuf; 571 572 dir->i_size += nfidlen; 573 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 574 dinfo->i_lenAlloc += nfidlen; 575 } else { 576 /* Truncate last extent to proper size */ 577 udf_fiiter_update_elen(iter, iter->elen - 578 (dinfo->i_lenExtents - dir->i_size)); 579 } 580 mark_inode_dirty(dir); 581 582 return 0; 583 } 584 585 static struct fileIdentDesc *udf_add_entry(struct inode *dir, 586 struct dentry *dentry, 587 struct udf_fileident_bh *fibh, 588 struct fileIdentDesc *cfi, int *err) 589 { 590 struct super_block *sb = dir->i_sb; 591 struct fileIdentDesc *fi = NULL; 592 unsigned char *name = NULL; 593 int namelen; 594 loff_t f_pos; 595 loff_t size = udf_ext0_offset(dir) + dir->i_size; 596 int nfidlen; 597 udf_pblk_t block; 598 struct kernel_lb_addr eloc; 599 uint32_t elen = 0; 600 sector_t offset; 601 struct extent_position epos = {}; 602 struct udf_inode_info *dinfo; 603 604 fibh->sbh = fibh->ebh = NULL; 605 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 606 if (!name) { 607 *err = -ENOMEM; 608 goto out_err; 609 } 610 611 if (dentry) { 612 if (!dentry->d_name.len) { 613 *err = -EINVAL; 614 goto out_err; 615 } 616 namelen = udf_put_filename(sb, dentry->d_name.name, 617 dentry->d_name.len, 618 name, UDF_NAME_LEN_CS0); 619 if (!namelen) { 620 *err = -ENAMETOOLONG; 621 goto out_err; 622 } 623 } else { 624 namelen = 0; 625 } 626 627 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 628 629 f_pos = udf_ext0_offset(dir); 630 631 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 632 dinfo = UDF_I(dir); 633 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 634 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 635 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 636 block = udf_get_lb_pblock(dir->i_sb, 637 &dinfo->i_location, 0); 638 fibh->soffset = fibh->eoffset = sb->s_blocksize; 639 goto add; 640 } 641 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 642 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 643 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 644 epos.offset -= sizeof(struct short_ad); 645 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 646 epos.offset -= sizeof(struct long_ad); 647 } else 648 offset = 0; 649 650 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 651 if (!fibh->sbh) { 652 *err = -EIO; 653 goto out_err; 654 } 655 656 block = dinfo->i_location.logicalBlockNum; 657 } 658 659 while (f_pos < size) { 660 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 661 &elen, &offset); 662 663 if (!fi) { 664 *err = -EIO; 665 goto out_err; 666 } 667 668 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 669 if (udf_dir_entry_len(cfi) == nfidlen) { 670 cfi->descTag.tagSerialNum = cpu_to_le16(1); 671 cfi->fileVersionNum = cpu_to_le16(1); 672 cfi->fileCharacteristics = 0; 673 cfi->lengthFileIdent = namelen; 674 cfi->lengthOfImpUse = cpu_to_le16(0); 675 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 676 name)) 677 goto out_ok; 678 else { 679 *err = -EIO; 680 goto out_err; 681 } 682 } 683 } 684 } 685 686 add: 687 f_pos += nfidlen; 688 689 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 690 sb->s_blocksize - fibh->eoffset < nfidlen) { 691 brelse(epos.bh); 692 epos.bh = NULL; 693 fibh->soffset -= udf_ext0_offset(dir); 694 fibh->eoffset -= udf_ext0_offset(dir); 695 f_pos -= udf_ext0_offset(dir); 696 if (fibh->sbh != fibh->ebh) 697 brelse(fibh->ebh); 698 brelse(fibh->sbh); 699 fibh->sbh = fibh->ebh = 700 udf_expand_dir_adinicb(dir, &block, err); 701 if (!fibh->sbh) 702 goto out_err; 703 epos.block = dinfo->i_location; 704 epos.offset = udf_file_entry_alloc_offset(dir); 705 /* Load extent udf_expand_dir_adinicb() has created */ 706 udf_current_aext(dir, &epos, &eloc, &elen, 1); 707 } 708 709 /* Entry fits into current block? */ 710 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 711 fibh->soffset = fibh->eoffset; 712 fibh->eoffset += nfidlen; 713 if (fibh->sbh != fibh->ebh) { 714 brelse(fibh->sbh); 715 fibh->sbh = fibh->ebh; 716 } 717 718 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 719 block = dinfo->i_location.logicalBlockNum; 720 fi = (struct fileIdentDesc *) 721 (dinfo->i_data + fibh->soffset - 722 udf_ext0_offset(dir) + 723 dinfo->i_lenEAttr); 724 } else { 725 block = eloc.logicalBlockNum + 726 ((elen - 1) >> 727 dir->i_sb->s_blocksize_bits); 728 fi = (struct fileIdentDesc *) 729 (fibh->sbh->b_data + fibh->soffset); 730 } 731 } else { 732 /* Round up last extent in the file */ 733 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 734 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 735 epos.offset -= sizeof(struct short_ad); 736 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 737 epos.offset -= sizeof(struct long_ad); 738 udf_write_aext(dir, &epos, &eloc, elen, 1); 739 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize 740 - 1) & ~(sb->s_blocksize - 1); 741 742 fibh->soffset = fibh->eoffset - sb->s_blocksize; 743 fibh->eoffset += nfidlen - sb->s_blocksize; 744 if (fibh->sbh != fibh->ebh) { 745 brelse(fibh->sbh); 746 fibh->sbh = fibh->ebh; 747 } 748 749 block = eloc.logicalBlockNum + ((elen - 1) >> 750 dir->i_sb->s_blocksize_bits); 751 fibh->ebh = udf_bread(dir, 752 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 753 if (!fibh->ebh) 754 goto out_err; 755 /* Extents could have been merged, invalidate our position */ 756 brelse(epos.bh); 757 epos.bh = NULL; 758 epos.block = dinfo->i_location; 759 epos.offset = udf_file_entry_alloc_offset(dir); 760 761 if (!fibh->soffset) { 762 /* Find the freshly allocated block */ 763 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 764 (EXT_RECORDED_ALLOCATED >> 30)) 765 ; 766 block = eloc.logicalBlockNum + ((elen - 1) >> 767 dir->i_sb->s_blocksize_bits); 768 brelse(fibh->sbh); 769 fibh->sbh = fibh->ebh; 770 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 771 } else { 772 fi = (struct fileIdentDesc *) 773 (fibh->sbh->b_data + sb->s_blocksize + 774 fibh->soffset); 775 } 776 } 777 778 memset(cfi, 0, sizeof(struct fileIdentDesc)); 779 if (UDF_SB(sb)->s_udfrev >= 0x0200) 780 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 781 sizeof(struct tag)); 782 else 783 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 784 sizeof(struct tag)); 785 cfi->fileVersionNum = cpu_to_le16(1); 786 cfi->lengthFileIdent = namelen; 787 cfi->lengthOfImpUse = cpu_to_le16(0); 788 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 789 dir->i_size += nfidlen; 790 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 791 dinfo->i_lenAlloc += nfidlen; 792 else { 793 /* Find the last extent and truncate it to proper size */ 794 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 795 (EXT_RECORDED_ALLOCATED >> 30)) 796 ; 797 elen -= dinfo->i_lenExtents - dir->i_size; 798 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 799 epos.offset -= sizeof(struct short_ad); 800 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 801 epos.offset -= sizeof(struct long_ad); 802 udf_write_aext(dir, &epos, &eloc, elen, 1); 803 dinfo->i_lenExtents = dir->i_size; 804 } 805 806 mark_inode_dirty(dir); 807 goto out_ok; 808 } else { 809 *err = -EIO; 810 goto out_err; 811 } 812 813 out_err: 814 fi = NULL; 815 if (fibh->sbh != fibh->ebh) 816 brelse(fibh->ebh); 817 brelse(fibh->sbh); 818 out_ok: 819 brelse(epos.bh); 820 kfree(name); 821 return fi; 822 } 823 824 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter) 825 { 826 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED; 827 828 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT)) 829 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad)); 830 831 udf_fiiter_write_fi(iter, NULL); 832 } 833 834 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 835 struct udf_fileident_bh *fibh, 836 struct fileIdentDesc *cfi) 837 { 838 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 839 840 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 841 memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); 842 843 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 844 } 845 846 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 847 { 848 struct udf_inode_info *iinfo = UDF_I(inode); 849 struct inode *dir = d_inode(dentry->d_parent); 850 struct udf_fileident_iter iter; 851 int err; 852 853 err = udf_fiiter_add_entry(dir, dentry, &iter); 854 if (err) { 855 inode_dec_link_count(inode); 856 discard_new_inode(inode); 857 return err; 858 } 859 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 860 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 861 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 862 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 863 udf_fiiter_write_fi(&iter, NULL); 864 dir->i_ctime = dir->i_mtime = current_time(dir); 865 mark_inode_dirty(dir); 866 udf_fiiter_release(&iter); 867 d_instantiate_new(dentry, inode); 868 869 return 0; 870 } 871 872 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 873 struct dentry *dentry, umode_t mode, bool excl) 874 { 875 struct inode *inode = udf_new_inode(dir, mode); 876 877 if (IS_ERR(inode)) 878 return PTR_ERR(inode); 879 880 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 881 inode->i_data.a_ops = &udf_adinicb_aops; 882 else 883 inode->i_data.a_ops = &udf_aops; 884 inode->i_op = &udf_file_inode_operations; 885 inode->i_fop = &udf_file_operations; 886 mark_inode_dirty(inode); 887 888 return udf_add_nondir(dentry, inode); 889 } 890 891 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 892 struct file *file, umode_t mode) 893 { 894 struct inode *inode = udf_new_inode(dir, mode); 895 896 if (IS_ERR(inode)) 897 return PTR_ERR(inode); 898 899 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 900 inode->i_data.a_ops = &udf_adinicb_aops; 901 else 902 inode->i_data.a_ops = &udf_aops; 903 inode->i_op = &udf_file_inode_operations; 904 inode->i_fop = &udf_file_operations; 905 mark_inode_dirty(inode); 906 d_tmpfile(file, inode); 907 unlock_new_inode(inode); 908 return finish_open_simple(file, 0); 909 } 910 911 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 912 struct dentry *dentry, umode_t mode, dev_t rdev) 913 { 914 struct inode *inode; 915 916 if (!old_valid_dev(rdev)) 917 return -EINVAL; 918 919 inode = udf_new_inode(dir, mode); 920 if (IS_ERR(inode)) 921 return PTR_ERR(inode); 922 923 init_special_inode(inode, mode, rdev); 924 return udf_add_nondir(dentry, inode); 925 } 926 927 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 928 struct dentry *dentry, umode_t mode) 929 { 930 struct inode *inode; 931 struct udf_fileident_iter iter; 932 int err; 933 struct udf_inode_info *dinfo = UDF_I(dir); 934 struct udf_inode_info *iinfo; 935 936 inode = udf_new_inode(dir, S_IFDIR | mode); 937 if (IS_ERR(inode)) 938 return PTR_ERR(inode); 939 940 iinfo = UDF_I(inode); 941 inode->i_op = &udf_dir_inode_operations; 942 inode->i_fop = &udf_dir_operations; 943 err = udf_fiiter_add_entry(inode, NULL, &iter); 944 if (err) { 945 clear_nlink(inode); 946 discard_new_inode(inode); 947 return err; 948 } 949 set_nlink(inode, 2); 950 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 951 iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 952 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 953 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 954 iter.fi.fileCharacteristics = 955 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 956 udf_fiiter_write_fi(&iter, NULL); 957 udf_fiiter_release(&iter); 958 mark_inode_dirty(inode); 959 960 err = udf_fiiter_add_entry(dir, dentry, &iter); 961 if (err) { 962 clear_nlink(inode); 963 discard_new_inode(inode); 964 return err; 965 } 966 iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 967 iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 968 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse = 969 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 970 iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 971 udf_fiiter_write_fi(&iter, NULL); 972 udf_fiiter_release(&iter); 973 inc_nlink(dir); 974 dir->i_ctime = dir->i_mtime = current_time(dir); 975 mark_inode_dirty(dir); 976 d_instantiate_new(dentry, inode); 977 978 return 0; 979 } 980 981 static int empty_dir(struct inode *dir) 982 { 983 struct udf_fileident_iter iter; 984 int ret; 985 986 for (ret = udf_fiiter_init(&iter, dir, 0); 987 !ret && iter.pos < dir->i_size; 988 ret = udf_fiiter_advance(&iter)) { 989 if (iter.fi.lengthFileIdent && 990 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 991 udf_fiiter_release(&iter); 992 return 0; 993 } 994 } 995 udf_fiiter_release(&iter); 996 997 return 1; 998 } 999 1000 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 1001 { 1002 int ret; 1003 struct inode *inode = d_inode(dentry); 1004 struct udf_fileident_iter iter; 1005 struct kernel_lb_addr tloc; 1006 1007 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 1008 if (ret) 1009 goto out; 1010 1011 ret = -EFSCORRUPTED; 1012 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 1013 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 1014 goto end_rmdir; 1015 ret = -ENOTEMPTY; 1016 if (!empty_dir(inode)) 1017 goto end_rmdir; 1018 udf_fiiter_delete_entry(&iter); 1019 if (inode->i_nlink != 2) 1020 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 1021 inode->i_nlink); 1022 clear_nlink(inode); 1023 inode->i_size = 0; 1024 inode_dec_link_count(dir); 1025 inode->i_ctime = dir->i_ctime = dir->i_mtime = 1026 current_time(inode); 1027 mark_inode_dirty(dir); 1028 ret = 0; 1029 end_rmdir: 1030 udf_fiiter_release(&iter); 1031 out: 1032 return ret; 1033 } 1034 1035 static int udf_unlink(struct inode *dir, struct dentry *dentry) 1036 { 1037 int ret; 1038 struct inode *inode = d_inode(dentry); 1039 struct udf_fileident_iter iter; 1040 struct kernel_lb_addr tloc; 1041 1042 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 1043 if (ret) 1044 goto out; 1045 1046 ret = -EFSCORRUPTED; 1047 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 1048 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 1049 goto end_unlink; 1050 1051 if (!inode->i_nlink) { 1052 udf_debug("Deleting nonexistent file (%lu), %u\n", 1053 inode->i_ino, inode->i_nlink); 1054 set_nlink(inode, 1); 1055 } 1056 udf_fiiter_delete_entry(&iter); 1057 dir->i_ctime = dir->i_mtime = current_time(dir); 1058 mark_inode_dirty(dir); 1059 inode_dec_link_count(inode); 1060 inode->i_ctime = dir->i_ctime; 1061 ret = 0; 1062 end_unlink: 1063 udf_fiiter_release(&iter); 1064 out: 1065 return ret; 1066 } 1067 1068 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1069 struct dentry *dentry, const char *symname) 1070 { 1071 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 1072 struct pathComponent *pc; 1073 const char *compstart; 1074 struct extent_position epos = {}; 1075 int eoffset, elen = 0; 1076 uint8_t *ea; 1077 int err; 1078 udf_pblk_t block; 1079 unsigned char *name = NULL; 1080 int namelen; 1081 struct udf_inode_info *iinfo; 1082 struct super_block *sb = dir->i_sb; 1083 1084 if (IS_ERR(inode)) 1085 return PTR_ERR(inode); 1086 1087 iinfo = UDF_I(inode); 1088 down_write(&iinfo->i_data_sem); 1089 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 1090 if (!name) { 1091 err = -ENOMEM; 1092 goto out_no_entry; 1093 } 1094 1095 inode->i_data.a_ops = &udf_symlink_aops; 1096 inode->i_op = &udf_symlink_inode_operations; 1097 inode_nohighmem(inode); 1098 1099 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1100 struct kernel_lb_addr eloc; 1101 uint32_t bsize; 1102 1103 block = udf_new_block(sb, inode, 1104 iinfo->i_location.partitionReferenceNum, 1105 iinfo->i_location.logicalBlockNum, &err); 1106 if (!block) 1107 goto out_no_entry; 1108 epos.block = iinfo->i_location; 1109 epos.offset = udf_file_entry_alloc_offset(inode); 1110 epos.bh = NULL; 1111 eloc.logicalBlockNum = block; 1112 eloc.partitionReferenceNum = 1113 iinfo->i_location.partitionReferenceNum; 1114 bsize = sb->s_blocksize; 1115 iinfo->i_lenExtents = bsize; 1116 udf_add_aext(inode, &epos, &eloc, bsize, 0); 1117 brelse(epos.bh); 1118 1119 block = udf_get_pblock(sb, block, 1120 iinfo->i_location.partitionReferenceNum, 1121 0); 1122 epos.bh = udf_tgetblk(sb, block); 1123 if (unlikely(!epos.bh)) { 1124 err = -ENOMEM; 1125 goto out_no_entry; 1126 } 1127 lock_buffer(epos.bh); 1128 memset(epos.bh->b_data, 0x00, bsize); 1129 set_buffer_uptodate(epos.bh); 1130 unlock_buffer(epos.bh); 1131 mark_buffer_dirty_inode(epos.bh, inode); 1132 ea = epos.bh->b_data + udf_ext0_offset(inode); 1133 } else 1134 ea = iinfo->i_data + iinfo->i_lenEAttr; 1135 1136 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 1137 pc = (struct pathComponent *)ea; 1138 1139 if (*symname == '/') { 1140 do { 1141 symname++; 1142 } while (*symname == '/'); 1143 1144 pc->componentType = 1; 1145 pc->lengthComponentIdent = 0; 1146 pc->componentFileVersionNum = 0; 1147 elen += sizeof(struct pathComponent); 1148 } 1149 1150 err = -ENAMETOOLONG; 1151 1152 while (*symname) { 1153 if (elen + sizeof(struct pathComponent) > eoffset) 1154 goto out_no_entry; 1155 1156 pc = (struct pathComponent *)(ea + elen); 1157 1158 compstart = symname; 1159 1160 do { 1161 symname++; 1162 } while (*symname && *symname != '/'); 1163 1164 pc->componentType = 5; 1165 pc->lengthComponentIdent = 0; 1166 pc->componentFileVersionNum = 0; 1167 if (compstart[0] == '.') { 1168 if ((symname - compstart) == 1) 1169 pc->componentType = 4; 1170 else if ((symname - compstart) == 2 && 1171 compstart[1] == '.') 1172 pc->componentType = 3; 1173 } 1174 1175 if (pc->componentType == 5) { 1176 namelen = udf_put_filename(sb, compstart, 1177 symname - compstart, 1178 name, UDF_NAME_LEN_CS0); 1179 if (!namelen) 1180 goto out_no_entry; 1181 1182 if (elen + sizeof(struct pathComponent) + namelen > 1183 eoffset) 1184 goto out_no_entry; 1185 else 1186 pc->lengthComponentIdent = namelen; 1187 1188 memcpy(pc->componentIdent, name, namelen); 1189 } 1190 1191 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1192 1193 if (*symname) { 1194 do { 1195 symname++; 1196 } while (*symname == '/'); 1197 } 1198 } 1199 1200 brelse(epos.bh); 1201 inode->i_size = elen; 1202 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1203 iinfo->i_lenAlloc = inode->i_size; 1204 else 1205 udf_truncate_tail_extent(inode); 1206 mark_inode_dirty(inode); 1207 up_write(&iinfo->i_data_sem); 1208 1209 err = udf_add_nondir(dentry, inode); 1210 out: 1211 kfree(name); 1212 return err; 1213 1214 out_no_entry: 1215 up_write(&iinfo->i_data_sem); 1216 inode_dec_link_count(inode); 1217 discard_new_inode(inode); 1218 goto out; 1219 } 1220 1221 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1222 struct dentry *dentry) 1223 { 1224 struct inode *inode = d_inode(old_dentry); 1225 struct udf_fileident_bh fibh; 1226 struct fileIdentDesc cfi, *fi; 1227 int err; 1228 1229 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1230 if (!fi) { 1231 return err; 1232 } 1233 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1234 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1235 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1236 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1237 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1238 } 1239 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1240 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1241 mark_inode_dirty(dir); 1242 1243 if (fibh.sbh != fibh.ebh) 1244 brelse(fibh.ebh); 1245 brelse(fibh.sbh); 1246 inc_nlink(inode); 1247 inode->i_ctime = current_time(inode); 1248 mark_inode_dirty(inode); 1249 dir->i_ctime = dir->i_mtime = current_time(dir); 1250 mark_inode_dirty(dir); 1251 ihold(inode); 1252 d_instantiate(dentry, inode); 1253 1254 return 0; 1255 } 1256 1257 /* Anybody can rename anything with this: the permission checks are left to the 1258 * higher-level routines. 1259 */ 1260 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1261 struct dentry *old_dentry, struct inode *new_dir, 1262 struct dentry *new_dentry, unsigned int flags) 1263 { 1264 struct inode *old_inode = d_inode(old_dentry); 1265 struct inode *new_inode = d_inode(new_dentry); 1266 struct udf_fileident_bh ofibh, nfibh; 1267 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1268 struct fileIdentDesc ocfi, ncfi; 1269 struct buffer_head *dir_bh = NULL; 1270 int retval = -ENOENT; 1271 struct kernel_lb_addr tloc; 1272 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1273 1274 if (flags & ~RENAME_NOREPLACE) 1275 return -EINVAL; 1276 1277 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1278 if (!ofi || IS_ERR(ofi)) { 1279 if (IS_ERR(ofi)) 1280 retval = PTR_ERR(ofi); 1281 goto end_rename; 1282 } 1283 1284 if (ofibh.sbh != ofibh.ebh) 1285 brelse(ofibh.ebh); 1286 1287 brelse(ofibh.sbh); 1288 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1289 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) 1290 goto end_rename; 1291 1292 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1293 if (IS_ERR(nfi)) { 1294 retval = PTR_ERR(nfi); 1295 goto end_rename; 1296 } 1297 if (nfi && !new_inode) { 1298 if (nfibh.sbh != nfibh.ebh) 1299 brelse(nfibh.ebh); 1300 brelse(nfibh.sbh); 1301 nfi = NULL; 1302 } 1303 if (S_ISDIR(old_inode->i_mode)) { 1304 int offset = udf_ext0_offset(old_inode); 1305 1306 if (new_inode) { 1307 retval = -ENOTEMPTY; 1308 if (!empty_dir(new_inode)) 1309 goto end_rename; 1310 } 1311 retval = -EIO; 1312 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1313 dir_fi = udf_get_fileident( 1314 old_iinfo->i_data - 1315 (old_iinfo->i_efe ? 1316 sizeof(struct extendedFileEntry) : 1317 sizeof(struct fileEntry)), 1318 old_inode->i_sb->s_blocksize, &offset); 1319 } else { 1320 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1321 if (!dir_bh) 1322 goto end_rename; 1323 dir_fi = udf_get_fileident(dir_bh->b_data, 1324 old_inode->i_sb->s_blocksize, &offset); 1325 } 1326 if (!dir_fi) 1327 goto end_rename; 1328 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1329 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1330 old_dir->i_ino) 1331 goto end_rename; 1332 } 1333 if (!nfi) { 1334 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1335 &retval); 1336 if (!nfi) 1337 goto end_rename; 1338 } 1339 1340 /* 1341 * Like most other Unix systems, set the ctime for inodes on a 1342 * rename. 1343 */ 1344 old_inode->i_ctime = current_time(old_inode); 1345 mark_inode_dirty(old_inode); 1346 1347 /* 1348 * ok, that's it 1349 */ 1350 ncfi.fileVersionNum = ocfi.fileVersionNum; 1351 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1352 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1353 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1354 1355 /* The old fid may have moved - find it again */ 1356 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1357 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1358 1359 if (new_inode) { 1360 new_inode->i_ctime = current_time(new_inode); 1361 inode_dec_link_count(new_inode); 1362 } 1363 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1364 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1365 mark_inode_dirty(old_dir); 1366 mark_inode_dirty(new_dir); 1367 1368 if (dir_fi) { 1369 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1370 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1371 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1372 mark_inode_dirty(old_inode); 1373 else 1374 mark_buffer_dirty_inode(dir_bh, old_inode); 1375 1376 inode_dec_link_count(old_dir); 1377 if (new_inode) 1378 inode_dec_link_count(new_inode); 1379 else { 1380 inc_nlink(new_dir); 1381 mark_inode_dirty(new_dir); 1382 } 1383 } 1384 1385 if (ofi) { 1386 if (ofibh.sbh != ofibh.ebh) 1387 brelse(ofibh.ebh); 1388 brelse(ofibh.sbh); 1389 } 1390 1391 retval = 0; 1392 1393 end_rename: 1394 brelse(dir_bh); 1395 if (nfi) { 1396 if (nfibh.sbh != nfibh.ebh) 1397 brelse(nfibh.ebh); 1398 brelse(nfibh.sbh); 1399 } 1400 1401 return retval; 1402 } 1403 1404 static struct dentry *udf_get_parent(struct dentry *child) 1405 { 1406 struct kernel_lb_addr tloc; 1407 struct inode *inode = NULL; 1408 struct udf_fileident_iter iter; 1409 int err; 1410 1411 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 1412 if (err) 1413 return ERR_PTR(err); 1414 1415 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 1416 udf_fiiter_release(&iter); 1417 inode = udf_iget(child->d_sb, &tloc); 1418 if (IS_ERR(inode)) 1419 return ERR_CAST(inode); 1420 1421 return d_obtain_alias(inode); 1422 } 1423 1424 1425 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1426 u16 partref, __u32 generation) 1427 { 1428 struct inode *inode; 1429 struct kernel_lb_addr loc; 1430 1431 if (block == 0) 1432 return ERR_PTR(-ESTALE); 1433 1434 loc.logicalBlockNum = block; 1435 loc.partitionReferenceNum = partref; 1436 inode = udf_iget(sb, &loc); 1437 1438 if (IS_ERR(inode)) 1439 return ERR_CAST(inode); 1440 1441 if (generation && inode->i_generation != generation) { 1442 iput(inode); 1443 return ERR_PTR(-ESTALE); 1444 } 1445 return d_obtain_alias(inode); 1446 } 1447 1448 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1449 struct fid *fid, int fh_len, int fh_type) 1450 { 1451 if (fh_len < 3 || 1452 (fh_type != FILEID_UDF_WITH_PARENT && 1453 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1454 return NULL; 1455 1456 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1457 fid->udf.generation); 1458 } 1459 1460 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1461 struct fid *fid, int fh_len, int fh_type) 1462 { 1463 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1464 return NULL; 1465 1466 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1467 fid->udf.parent_partref, 1468 fid->udf.parent_generation); 1469 } 1470 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1471 struct inode *parent) 1472 { 1473 int len = *lenp; 1474 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1475 struct fid *fid = (struct fid *)fh; 1476 int type = FILEID_UDF_WITHOUT_PARENT; 1477 1478 if (parent && (len < 5)) { 1479 *lenp = 5; 1480 return FILEID_INVALID; 1481 } else if (len < 3) { 1482 *lenp = 3; 1483 return FILEID_INVALID; 1484 } 1485 1486 *lenp = 3; 1487 fid->udf.block = location.logicalBlockNum; 1488 fid->udf.partref = location.partitionReferenceNum; 1489 fid->udf.parent_partref = 0; 1490 fid->udf.generation = inode->i_generation; 1491 1492 if (parent) { 1493 location = UDF_I(parent)->i_location; 1494 fid->udf.parent_block = location.logicalBlockNum; 1495 fid->udf.parent_partref = location.partitionReferenceNum; 1496 fid->udf.parent_generation = inode->i_generation; 1497 *lenp = 5; 1498 type = FILEID_UDF_WITH_PARENT; 1499 } 1500 1501 return type; 1502 } 1503 1504 const struct export_operations udf_export_ops = { 1505 .encode_fh = udf_encode_fh, 1506 .fh_to_dentry = udf_fh_to_dentry, 1507 .fh_to_parent = udf_fh_to_parent, 1508 .get_parent = udf_get_parent, 1509 }; 1510 1511 const struct inode_operations udf_dir_inode_operations = { 1512 .lookup = udf_lookup, 1513 .create = udf_create, 1514 .link = udf_link, 1515 .unlink = udf_unlink, 1516 .symlink = udf_symlink, 1517 .mkdir = udf_mkdir, 1518 .rmdir = udf_rmdir, 1519 .mknod = udf_mknod, 1520 .rename = udf_rename, 1521 .tmpfile = udf_tmpfile, 1522 }; 1523