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 struct fileIdentDesc *udf_add_entry(struct inode *dir, 476 struct dentry *dentry, 477 struct udf_fileident_bh *fibh, 478 struct fileIdentDesc *cfi, int *err) 479 { 480 struct super_block *sb = dir->i_sb; 481 struct fileIdentDesc *fi = NULL; 482 unsigned char *name = NULL; 483 int namelen; 484 loff_t f_pos; 485 loff_t size = udf_ext0_offset(dir) + dir->i_size; 486 int nfidlen; 487 udf_pblk_t block; 488 struct kernel_lb_addr eloc; 489 uint32_t elen = 0; 490 sector_t offset; 491 struct extent_position epos = {}; 492 struct udf_inode_info *dinfo; 493 494 fibh->sbh = fibh->ebh = NULL; 495 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 496 if (!name) { 497 *err = -ENOMEM; 498 goto out_err; 499 } 500 501 if (dentry) { 502 if (!dentry->d_name.len) { 503 *err = -EINVAL; 504 goto out_err; 505 } 506 namelen = udf_put_filename(sb, dentry->d_name.name, 507 dentry->d_name.len, 508 name, UDF_NAME_LEN_CS0); 509 if (!namelen) { 510 *err = -ENAMETOOLONG; 511 goto out_err; 512 } 513 } else { 514 namelen = 0; 515 } 516 517 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 518 519 f_pos = udf_ext0_offset(dir); 520 521 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 522 dinfo = UDF_I(dir); 523 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 524 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 525 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 526 block = udf_get_lb_pblock(dir->i_sb, 527 &dinfo->i_location, 0); 528 fibh->soffset = fibh->eoffset = sb->s_blocksize; 529 goto add; 530 } 531 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 532 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 533 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 534 epos.offset -= sizeof(struct short_ad); 535 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 536 epos.offset -= sizeof(struct long_ad); 537 } else 538 offset = 0; 539 540 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 541 if (!fibh->sbh) { 542 *err = -EIO; 543 goto out_err; 544 } 545 546 block = dinfo->i_location.logicalBlockNum; 547 } 548 549 while (f_pos < size) { 550 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 551 &elen, &offset); 552 553 if (!fi) { 554 *err = -EIO; 555 goto out_err; 556 } 557 558 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 559 if (udf_dir_entry_len(cfi) == nfidlen) { 560 cfi->descTag.tagSerialNum = cpu_to_le16(1); 561 cfi->fileVersionNum = cpu_to_le16(1); 562 cfi->fileCharacteristics = 0; 563 cfi->lengthFileIdent = namelen; 564 cfi->lengthOfImpUse = cpu_to_le16(0); 565 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 566 name)) 567 goto out_ok; 568 else { 569 *err = -EIO; 570 goto out_err; 571 } 572 } 573 } 574 } 575 576 add: 577 f_pos += nfidlen; 578 579 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 580 sb->s_blocksize - fibh->eoffset < nfidlen) { 581 brelse(epos.bh); 582 epos.bh = NULL; 583 fibh->soffset -= udf_ext0_offset(dir); 584 fibh->eoffset -= udf_ext0_offset(dir); 585 f_pos -= udf_ext0_offset(dir); 586 if (fibh->sbh != fibh->ebh) 587 brelse(fibh->ebh); 588 brelse(fibh->sbh); 589 fibh->sbh = fibh->ebh = 590 udf_expand_dir_adinicb(dir, &block, err); 591 if (!fibh->sbh) 592 goto out_err; 593 epos.block = dinfo->i_location; 594 epos.offset = udf_file_entry_alloc_offset(dir); 595 /* Load extent udf_expand_dir_adinicb() has created */ 596 udf_current_aext(dir, &epos, &eloc, &elen, 1); 597 } 598 599 /* Entry fits into current block? */ 600 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 601 fibh->soffset = fibh->eoffset; 602 fibh->eoffset += nfidlen; 603 if (fibh->sbh != fibh->ebh) { 604 brelse(fibh->sbh); 605 fibh->sbh = fibh->ebh; 606 } 607 608 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 609 block = dinfo->i_location.logicalBlockNum; 610 fi = (struct fileIdentDesc *) 611 (dinfo->i_data + fibh->soffset - 612 udf_ext0_offset(dir) + 613 dinfo->i_lenEAttr); 614 } else { 615 block = eloc.logicalBlockNum + 616 ((elen - 1) >> 617 dir->i_sb->s_blocksize_bits); 618 fi = (struct fileIdentDesc *) 619 (fibh->sbh->b_data + fibh->soffset); 620 } 621 } else { 622 /* Round up last extent in the file */ 623 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 624 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 625 epos.offset -= sizeof(struct short_ad); 626 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 627 epos.offset -= sizeof(struct long_ad); 628 udf_write_aext(dir, &epos, &eloc, elen, 1); 629 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize 630 - 1) & ~(sb->s_blocksize - 1); 631 632 fibh->soffset = fibh->eoffset - sb->s_blocksize; 633 fibh->eoffset += nfidlen - sb->s_blocksize; 634 if (fibh->sbh != fibh->ebh) { 635 brelse(fibh->sbh); 636 fibh->sbh = fibh->ebh; 637 } 638 639 block = eloc.logicalBlockNum + ((elen - 1) >> 640 dir->i_sb->s_blocksize_bits); 641 fibh->ebh = udf_bread(dir, 642 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 643 if (!fibh->ebh) 644 goto out_err; 645 /* Extents could have been merged, invalidate our position */ 646 brelse(epos.bh); 647 epos.bh = NULL; 648 epos.block = dinfo->i_location; 649 epos.offset = udf_file_entry_alloc_offset(dir); 650 651 if (!fibh->soffset) { 652 /* Find the freshly allocated block */ 653 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 654 (EXT_RECORDED_ALLOCATED >> 30)) 655 ; 656 block = eloc.logicalBlockNum + ((elen - 1) >> 657 dir->i_sb->s_blocksize_bits); 658 brelse(fibh->sbh); 659 fibh->sbh = fibh->ebh; 660 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 661 } else { 662 fi = (struct fileIdentDesc *) 663 (fibh->sbh->b_data + sb->s_blocksize + 664 fibh->soffset); 665 } 666 } 667 668 memset(cfi, 0, sizeof(struct fileIdentDesc)); 669 if (UDF_SB(sb)->s_udfrev >= 0x0200) 670 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 671 sizeof(struct tag)); 672 else 673 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 674 sizeof(struct tag)); 675 cfi->fileVersionNum = cpu_to_le16(1); 676 cfi->lengthFileIdent = namelen; 677 cfi->lengthOfImpUse = cpu_to_le16(0); 678 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 679 dir->i_size += nfidlen; 680 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 681 dinfo->i_lenAlloc += nfidlen; 682 else { 683 /* Find the last extent and truncate it to proper size */ 684 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 685 (EXT_RECORDED_ALLOCATED >> 30)) 686 ; 687 elen -= dinfo->i_lenExtents - dir->i_size; 688 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 689 epos.offset -= sizeof(struct short_ad); 690 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 691 epos.offset -= sizeof(struct long_ad); 692 udf_write_aext(dir, &epos, &eloc, elen, 1); 693 dinfo->i_lenExtents = dir->i_size; 694 } 695 696 mark_inode_dirty(dir); 697 goto out_ok; 698 } else { 699 *err = -EIO; 700 goto out_err; 701 } 702 703 out_err: 704 fi = NULL; 705 if (fibh->sbh != fibh->ebh) 706 brelse(fibh->ebh); 707 brelse(fibh->sbh); 708 out_ok: 709 brelse(epos.bh); 710 kfree(name); 711 return fi; 712 } 713 714 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter) 715 { 716 iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED; 717 718 if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT)) 719 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad)); 720 721 udf_fiiter_write_fi(iter, NULL); 722 } 723 724 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 725 struct udf_fileident_bh *fibh, 726 struct fileIdentDesc *cfi) 727 { 728 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 729 730 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 731 memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); 732 733 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 734 } 735 736 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 737 { 738 struct udf_inode_info *iinfo = UDF_I(inode); 739 struct inode *dir = d_inode(dentry->d_parent); 740 struct udf_fileident_bh fibh; 741 struct fileIdentDesc cfi, *fi; 742 int err; 743 744 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 745 if (unlikely(!fi)) { 746 inode_dec_link_count(inode); 747 discard_new_inode(inode); 748 return err; 749 } 750 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 751 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 752 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 753 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 754 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 755 dir->i_ctime = dir->i_mtime = current_time(dir); 756 mark_inode_dirty(dir); 757 if (fibh.sbh != fibh.ebh) 758 brelse(fibh.ebh); 759 brelse(fibh.sbh); 760 d_instantiate_new(dentry, inode); 761 762 return 0; 763 } 764 765 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 766 struct dentry *dentry, umode_t mode, bool excl) 767 { 768 struct inode *inode = udf_new_inode(dir, mode); 769 770 if (IS_ERR(inode)) 771 return PTR_ERR(inode); 772 773 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 774 inode->i_data.a_ops = &udf_adinicb_aops; 775 else 776 inode->i_data.a_ops = &udf_aops; 777 inode->i_op = &udf_file_inode_operations; 778 inode->i_fop = &udf_file_operations; 779 mark_inode_dirty(inode); 780 781 return udf_add_nondir(dentry, inode); 782 } 783 784 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 785 struct file *file, umode_t mode) 786 { 787 struct inode *inode = udf_new_inode(dir, mode); 788 789 if (IS_ERR(inode)) 790 return PTR_ERR(inode); 791 792 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 793 inode->i_data.a_ops = &udf_adinicb_aops; 794 else 795 inode->i_data.a_ops = &udf_aops; 796 inode->i_op = &udf_file_inode_operations; 797 inode->i_fop = &udf_file_operations; 798 mark_inode_dirty(inode); 799 d_tmpfile(file, inode); 800 unlock_new_inode(inode); 801 return finish_open_simple(file, 0); 802 } 803 804 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 805 struct dentry *dentry, umode_t mode, dev_t rdev) 806 { 807 struct inode *inode; 808 809 if (!old_valid_dev(rdev)) 810 return -EINVAL; 811 812 inode = udf_new_inode(dir, mode); 813 if (IS_ERR(inode)) 814 return PTR_ERR(inode); 815 816 init_special_inode(inode, mode, rdev); 817 return udf_add_nondir(dentry, inode); 818 } 819 820 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 821 struct dentry *dentry, umode_t mode) 822 { 823 struct inode *inode; 824 struct udf_fileident_bh fibh; 825 struct fileIdentDesc cfi, *fi; 826 int err; 827 struct udf_inode_info *dinfo = UDF_I(dir); 828 struct udf_inode_info *iinfo; 829 830 inode = udf_new_inode(dir, S_IFDIR | mode); 831 if (IS_ERR(inode)) 832 return PTR_ERR(inode); 833 834 iinfo = UDF_I(inode); 835 inode->i_op = &udf_dir_inode_operations; 836 inode->i_fop = &udf_dir_operations; 837 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 838 if (!fi) { 839 inode_dec_link_count(inode); 840 discard_new_inode(inode); 841 goto out; 842 } 843 set_nlink(inode, 2); 844 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 845 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 846 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 847 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 848 cfi.fileCharacteristics = 849 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 850 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 851 brelse(fibh.sbh); 852 mark_inode_dirty(inode); 853 854 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 855 if (!fi) { 856 clear_nlink(inode); 857 mark_inode_dirty(inode); 858 discard_new_inode(inode); 859 goto out; 860 } 861 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 862 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 863 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 864 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 865 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 866 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 867 inc_nlink(dir); 868 dir->i_ctime = dir->i_mtime = current_time(dir); 869 mark_inode_dirty(dir); 870 d_instantiate_new(dentry, inode); 871 if (fibh.sbh != fibh.ebh) 872 brelse(fibh.ebh); 873 brelse(fibh.sbh); 874 err = 0; 875 876 out: 877 return err; 878 } 879 880 static int empty_dir(struct inode *dir) 881 { 882 struct udf_fileident_iter iter; 883 int ret; 884 885 for (ret = udf_fiiter_init(&iter, dir, 0); 886 !ret && iter.pos < dir->i_size; 887 ret = udf_fiiter_advance(&iter)) { 888 if (iter.fi.lengthFileIdent && 889 !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) { 890 udf_fiiter_release(&iter); 891 return 0; 892 } 893 } 894 udf_fiiter_release(&iter); 895 896 return 1; 897 } 898 899 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 900 { 901 int ret; 902 struct inode *inode = d_inode(dentry); 903 struct udf_fileident_iter iter; 904 struct kernel_lb_addr tloc; 905 906 ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter); 907 if (ret) 908 goto out; 909 910 ret = -EFSCORRUPTED; 911 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 912 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 913 goto end_rmdir; 914 ret = -ENOTEMPTY; 915 if (!empty_dir(inode)) 916 goto end_rmdir; 917 udf_fiiter_delete_entry(&iter); 918 if (inode->i_nlink != 2) 919 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 920 inode->i_nlink); 921 clear_nlink(inode); 922 inode->i_size = 0; 923 inode_dec_link_count(dir); 924 inode->i_ctime = dir->i_ctime = dir->i_mtime = 925 current_time(inode); 926 mark_inode_dirty(dir); 927 ret = 0; 928 end_rmdir: 929 udf_fiiter_release(&iter); 930 out: 931 return ret; 932 } 933 934 static int udf_unlink(struct inode *dir, struct dentry *dentry) 935 { 936 int retval; 937 struct inode *inode = d_inode(dentry); 938 struct udf_fileident_bh fibh; 939 struct fileIdentDesc *fi; 940 struct fileIdentDesc cfi; 941 struct kernel_lb_addr tloc; 942 943 retval = -ENOENT; 944 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 945 946 if (IS_ERR_OR_NULL(fi)) { 947 if (fi) 948 retval = PTR_ERR(fi); 949 goto out; 950 } 951 952 retval = -EIO; 953 tloc = lelb_to_cpu(cfi.icb.extLocation); 954 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 955 goto end_unlink; 956 957 if (!inode->i_nlink) { 958 udf_debug("Deleting nonexistent file (%lu), %u\n", 959 inode->i_ino, inode->i_nlink); 960 set_nlink(inode, 1); 961 } 962 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 963 if (retval) 964 goto end_unlink; 965 dir->i_ctime = dir->i_mtime = current_time(dir); 966 mark_inode_dirty(dir); 967 inode_dec_link_count(inode); 968 inode->i_ctime = dir->i_ctime; 969 retval = 0; 970 971 end_unlink: 972 if (fibh.sbh != fibh.ebh) 973 brelse(fibh.ebh); 974 brelse(fibh.sbh); 975 976 out: 977 return retval; 978 } 979 980 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 981 struct dentry *dentry, const char *symname) 982 { 983 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 984 struct pathComponent *pc; 985 const char *compstart; 986 struct extent_position epos = {}; 987 int eoffset, elen = 0; 988 uint8_t *ea; 989 int err; 990 udf_pblk_t block; 991 unsigned char *name = NULL; 992 int namelen; 993 struct udf_inode_info *iinfo; 994 struct super_block *sb = dir->i_sb; 995 996 if (IS_ERR(inode)) 997 return PTR_ERR(inode); 998 999 iinfo = UDF_I(inode); 1000 down_write(&iinfo->i_data_sem); 1001 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 1002 if (!name) { 1003 err = -ENOMEM; 1004 goto out_no_entry; 1005 } 1006 1007 inode->i_data.a_ops = &udf_symlink_aops; 1008 inode->i_op = &udf_symlink_inode_operations; 1009 inode_nohighmem(inode); 1010 1011 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 1012 struct kernel_lb_addr eloc; 1013 uint32_t bsize; 1014 1015 block = udf_new_block(sb, inode, 1016 iinfo->i_location.partitionReferenceNum, 1017 iinfo->i_location.logicalBlockNum, &err); 1018 if (!block) 1019 goto out_no_entry; 1020 epos.block = iinfo->i_location; 1021 epos.offset = udf_file_entry_alloc_offset(inode); 1022 epos.bh = NULL; 1023 eloc.logicalBlockNum = block; 1024 eloc.partitionReferenceNum = 1025 iinfo->i_location.partitionReferenceNum; 1026 bsize = sb->s_blocksize; 1027 iinfo->i_lenExtents = bsize; 1028 udf_add_aext(inode, &epos, &eloc, bsize, 0); 1029 brelse(epos.bh); 1030 1031 block = udf_get_pblock(sb, block, 1032 iinfo->i_location.partitionReferenceNum, 1033 0); 1034 epos.bh = udf_tgetblk(sb, block); 1035 if (unlikely(!epos.bh)) { 1036 err = -ENOMEM; 1037 goto out_no_entry; 1038 } 1039 lock_buffer(epos.bh); 1040 memset(epos.bh->b_data, 0x00, bsize); 1041 set_buffer_uptodate(epos.bh); 1042 unlock_buffer(epos.bh); 1043 mark_buffer_dirty_inode(epos.bh, inode); 1044 ea = epos.bh->b_data + udf_ext0_offset(inode); 1045 } else 1046 ea = iinfo->i_data + iinfo->i_lenEAttr; 1047 1048 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 1049 pc = (struct pathComponent *)ea; 1050 1051 if (*symname == '/') { 1052 do { 1053 symname++; 1054 } while (*symname == '/'); 1055 1056 pc->componentType = 1; 1057 pc->lengthComponentIdent = 0; 1058 pc->componentFileVersionNum = 0; 1059 elen += sizeof(struct pathComponent); 1060 } 1061 1062 err = -ENAMETOOLONG; 1063 1064 while (*symname) { 1065 if (elen + sizeof(struct pathComponent) > eoffset) 1066 goto out_no_entry; 1067 1068 pc = (struct pathComponent *)(ea + elen); 1069 1070 compstart = symname; 1071 1072 do { 1073 symname++; 1074 } while (*symname && *symname != '/'); 1075 1076 pc->componentType = 5; 1077 pc->lengthComponentIdent = 0; 1078 pc->componentFileVersionNum = 0; 1079 if (compstart[0] == '.') { 1080 if ((symname - compstart) == 1) 1081 pc->componentType = 4; 1082 else if ((symname - compstart) == 2 && 1083 compstart[1] == '.') 1084 pc->componentType = 3; 1085 } 1086 1087 if (pc->componentType == 5) { 1088 namelen = udf_put_filename(sb, compstart, 1089 symname - compstart, 1090 name, UDF_NAME_LEN_CS0); 1091 if (!namelen) 1092 goto out_no_entry; 1093 1094 if (elen + sizeof(struct pathComponent) + namelen > 1095 eoffset) 1096 goto out_no_entry; 1097 else 1098 pc->lengthComponentIdent = namelen; 1099 1100 memcpy(pc->componentIdent, name, namelen); 1101 } 1102 1103 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1104 1105 if (*symname) { 1106 do { 1107 symname++; 1108 } while (*symname == '/'); 1109 } 1110 } 1111 1112 brelse(epos.bh); 1113 inode->i_size = elen; 1114 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1115 iinfo->i_lenAlloc = inode->i_size; 1116 else 1117 udf_truncate_tail_extent(inode); 1118 mark_inode_dirty(inode); 1119 up_write(&iinfo->i_data_sem); 1120 1121 err = udf_add_nondir(dentry, inode); 1122 out: 1123 kfree(name); 1124 return err; 1125 1126 out_no_entry: 1127 up_write(&iinfo->i_data_sem); 1128 inode_dec_link_count(inode); 1129 discard_new_inode(inode); 1130 goto out; 1131 } 1132 1133 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1134 struct dentry *dentry) 1135 { 1136 struct inode *inode = d_inode(old_dentry); 1137 struct udf_fileident_bh fibh; 1138 struct fileIdentDesc cfi, *fi; 1139 int err; 1140 1141 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1142 if (!fi) { 1143 return err; 1144 } 1145 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1146 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1147 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1148 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1149 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1150 } 1151 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1152 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1153 mark_inode_dirty(dir); 1154 1155 if (fibh.sbh != fibh.ebh) 1156 brelse(fibh.ebh); 1157 brelse(fibh.sbh); 1158 inc_nlink(inode); 1159 inode->i_ctime = current_time(inode); 1160 mark_inode_dirty(inode); 1161 dir->i_ctime = dir->i_mtime = current_time(dir); 1162 mark_inode_dirty(dir); 1163 ihold(inode); 1164 d_instantiate(dentry, inode); 1165 1166 return 0; 1167 } 1168 1169 /* Anybody can rename anything with this: the permission checks are left to the 1170 * higher-level routines. 1171 */ 1172 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1173 struct dentry *old_dentry, struct inode *new_dir, 1174 struct dentry *new_dentry, unsigned int flags) 1175 { 1176 struct inode *old_inode = d_inode(old_dentry); 1177 struct inode *new_inode = d_inode(new_dentry); 1178 struct udf_fileident_bh ofibh, nfibh; 1179 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1180 struct fileIdentDesc ocfi, ncfi; 1181 struct buffer_head *dir_bh = NULL; 1182 int retval = -ENOENT; 1183 struct kernel_lb_addr tloc; 1184 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1185 1186 if (flags & ~RENAME_NOREPLACE) 1187 return -EINVAL; 1188 1189 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1190 if (!ofi || IS_ERR(ofi)) { 1191 if (IS_ERR(ofi)) 1192 retval = PTR_ERR(ofi); 1193 goto end_rename; 1194 } 1195 1196 if (ofibh.sbh != ofibh.ebh) 1197 brelse(ofibh.ebh); 1198 1199 brelse(ofibh.sbh); 1200 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1201 if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) 1202 goto end_rename; 1203 1204 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1205 if (IS_ERR(nfi)) { 1206 retval = PTR_ERR(nfi); 1207 goto end_rename; 1208 } 1209 if (nfi && !new_inode) { 1210 if (nfibh.sbh != nfibh.ebh) 1211 brelse(nfibh.ebh); 1212 brelse(nfibh.sbh); 1213 nfi = NULL; 1214 } 1215 if (S_ISDIR(old_inode->i_mode)) { 1216 int offset = udf_ext0_offset(old_inode); 1217 1218 if (new_inode) { 1219 retval = -ENOTEMPTY; 1220 if (!empty_dir(new_inode)) 1221 goto end_rename; 1222 } 1223 retval = -EIO; 1224 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1225 dir_fi = udf_get_fileident( 1226 old_iinfo->i_data - 1227 (old_iinfo->i_efe ? 1228 sizeof(struct extendedFileEntry) : 1229 sizeof(struct fileEntry)), 1230 old_inode->i_sb->s_blocksize, &offset); 1231 } else { 1232 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1233 if (!dir_bh) 1234 goto end_rename; 1235 dir_fi = udf_get_fileident(dir_bh->b_data, 1236 old_inode->i_sb->s_blocksize, &offset); 1237 } 1238 if (!dir_fi) 1239 goto end_rename; 1240 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1241 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1242 old_dir->i_ino) 1243 goto end_rename; 1244 } 1245 if (!nfi) { 1246 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1247 &retval); 1248 if (!nfi) 1249 goto end_rename; 1250 } 1251 1252 /* 1253 * Like most other Unix systems, set the ctime for inodes on a 1254 * rename. 1255 */ 1256 old_inode->i_ctime = current_time(old_inode); 1257 mark_inode_dirty(old_inode); 1258 1259 /* 1260 * ok, that's it 1261 */ 1262 ncfi.fileVersionNum = ocfi.fileVersionNum; 1263 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1264 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1265 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1266 1267 /* The old fid may have moved - find it again */ 1268 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1269 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1270 1271 if (new_inode) { 1272 new_inode->i_ctime = current_time(new_inode); 1273 inode_dec_link_count(new_inode); 1274 } 1275 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1276 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1277 mark_inode_dirty(old_dir); 1278 mark_inode_dirty(new_dir); 1279 1280 if (dir_fi) { 1281 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1282 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1283 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1284 mark_inode_dirty(old_inode); 1285 else 1286 mark_buffer_dirty_inode(dir_bh, old_inode); 1287 1288 inode_dec_link_count(old_dir); 1289 if (new_inode) 1290 inode_dec_link_count(new_inode); 1291 else { 1292 inc_nlink(new_dir); 1293 mark_inode_dirty(new_dir); 1294 } 1295 } 1296 1297 if (ofi) { 1298 if (ofibh.sbh != ofibh.ebh) 1299 brelse(ofibh.ebh); 1300 brelse(ofibh.sbh); 1301 } 1302 1303 retval = 0; 1304 1305 end_rename: 1306 brelse(dir_bh); 1307 if (nfi) { 1308 if (nfibh.sbh != nfibh.ebh) 1309 brelse(nfibh.ebh); 1310 brelse(nfibh.sbh); 1311 } 1312 1313 return retval; 1314 } 1315 1316 static struct dentry *udf_get_parent(struct dentry *child) 1317 { 1318 struct kernel_lb_addr tloc; 1319 struct inode *inode = NULL; 1320 struct udf_fileident_iter iter; 1321 int err; 1322 1323 err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter); 1324 if (err) 1325 return ERR_PTR(err); 1326 1327 tloc = lelb_to_cpu(iter.fi.icb.extLocation); 1328 udf_fiiter_release(&iter); 1329 inode = udf_iget(child->d_sb, &tloc); 1330 if (IS_ERR(inode)) 1331 return ERR_CAST(inode); 1332 1333 return d_obtain_alias(inode); 1334 } 1335 1336 1337 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1338 u16 partref, __u32 generation) 1339 { 1340 struct inode *inode; 1341 struct kernel_lb_addr loc; 1342 1343 if (block == 0) 1344 return ERR_PTR(-ESTALE); 1345 1346 loc.logicalBlockNum = block; 1347 loc.partitionReferenceNum = partref; 1348 inode = udf_iget(sb, &loc); 1349 1350 if (IS_ERR(inode)) 1351 return ERR_CAST(inode); 1352 1353 if (generation && inode->i_generation != generation) { 1354 iput(inode); 1355 return ERR_PTR(-ESTALE); 1356 } 1357 return d_obtain_alias(inode); 1358 } 1359 1360 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1361 struct fid *fid, int fh_len, int fh_type) 1362 { 1363 if (fh_len < 3 || 1364 (fh_type != FILEID_UDF_WITH_PARENT && 1365 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1366 return NULL; 1367 1368 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1369 fid->udf.generation); 1370 } 1371 1372 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1373 struct fid *fid, int fh_len, int fh_type) 1374 { 1375 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1376 return NULL; 1377 1378 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1379 fid->udf.parent_partref, 1380 fid->udf.parent_generation); 1381 } 1382 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1383 struct inode *parent) 1384 { 1385 int len = *lenp; 1386 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1387 struct fid *fid = (struct fid *)fh; 1388 int type = FILEID_UDF_WITHOUT_PARENT; 1389 1390 if (parent && (len < 5)) { 1391 *lenp = 5; 1392 return FILEID_INVALID; 1393 } else if (len < 3) { 1394 *lenp = 3; 1395 return FILEID_INVALID; 1396 } 1397 1398 *lenp = 3; 1399 fid->udf.block = location.logicalBlockNum; 1400 fid->udf.partref = location.partitionReferenceNum; 1401 fid->udf.parent_partref = 0; 1402 fid->udf.generation = inode->i_generation; 1403 1404 if (parent) { 1405 location = UDF_I(parent)->i_location; 1406 fid->udf.parent_block = location.logicalBlockNum; 1407 fid->udf.parent_partref = location.partitionReferenceNum; 1408 fid->udf.parent_generation = inode->i_generation; 1409 *lenp = 5; 1410 type = FILEID_UDF_WITH_PARENT; 1411 } 1412 1413 return type; 1414 } 1415 1416 const struct export_operations udf_export_ops = { 1417 .encode_fh = udf_encode_fh, 1418 .fh_to_dentry = udf_fh_to_dentry, 1419 .fh_to_parent = udf_fh_to_parent, 1420 .get_parent = udf_get_parent, 1421 }; 1422 1423 const struct inode_operations udf_dir_inode_operations = { 1424 .lookup = udf_lookup, 1425 .create = udf_create, 1426 .link = udf_link, 1427 .unlink = udf_unlink, 1428 .symlink = udf_symlink, 1429 .mkdir = udf_mkdir, 1430 .rmdir = udf_rmdir, 1431 .mknod = udf_mknod, 1432 .rename = udf_rename, 1433 .tmpfile = udf_tmpfile, 1434 }; 1435