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 34 static inline int udf_match(int len1, const unsigned char *name1, int len2, 35 const unsigned char *name2) 36 { 37 if (len1 != len2) 38 return 0; 39 40 return !memcmp(name1, name2, len1); 41 } 42 43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, 44 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, 45 uint8_t *impuse, uint8_t *fileident) 46 { 47 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag); 48 uint16_t crc; 49 int offset; 50 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); 51 uint8_t lfi = cfi->lengthFileIdent; 52 int padlen = fibh->eoffset - fibh->soffset - liu - lfi - 53 sizeof(struct fileIdentDesc); 54 int adinicb = 0; 55 56 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 57 adinicb = 1; 58 59 offset = fibh->soffset + sizeof(struct fileIdentDesc); 60 61 if (impuse) { 62 if (adinicb || (offset + liu < 0)) { 63 memcpy((uint8_t *)sfi->impUse, impuse, liu); 64 } else if (offset >= 0) { 65 memcpy(fibh->ebh->b_data + offset, impuse, liu); 66 } else { 67 memcpy((uint8_t *)sfi->impUse, impuse, -offset); 68 memcpy(fibh->ebh->b_data, impuse - offset, 69 liu + offset); 70 } 71 } 72 73 offset += liu; 74 75 if (fileident) { 76 if (adinicb || (offset + lfi < 0)) { 77 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); 78 } else if (offset >= 0) { 79 memcpy(fibh->ebh->b_data + offset, fileident, lfi); 80 } else { 81 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, 82 -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((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); 92 } else if (offset >= 0) { 93 memset(fibh->ebh->b_data + offset, 0x00, padlen); 94 } else { 95 memset((uint8_t *)sfi->padding + 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 return 0; 139 } 140 141 /** 142 * udf_find_entry - find entry in given directory. 143 * 144 * @dir: directory inode to search in 145 * @child: qstr of the name 146 * @fibh: buffer head / inode with file identifier descriptor we found 147 * @cfi: found file identifier descriptor with given name 148 * 149 * This function searches in the directory @dir for a file name @child. When 150 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB 151 * directories) containing the file identifier descriptor (FID). In that case 152 * the function returns pointer to the FID in the buffer or inode - but note 153 * that FID may be split among two buffers (blocks) so accessing it via that 154 * pointer isn't easily possible. This pointer can be used only as an iterator 155 * for other directory manipulation functions. For inspection of the FID @cfi 156 * can be used - the found FID is copied there. 157 * 158 * Returns pointer to FID, NULL when nothing found, or error code. 159 */ 160 static struct fileIdentDesc *udf_find_entry(struct inode *dir, 161 const struct qstr *child, 162 struct udf_fileident_bh *fibh, 163 struct fileIdentDesc *cfi) 164 { 165 struct fileIdentDesc *fi = NULL; 166 loff_t f_pos; 167 udf_pblk_t block; 168 int flen; 169 unsigned char *fname = NULL, *copy_name = NULL; 170 unsigned char *nameptr; 171 uint8_t lfi; 172 uint16_t liu; 173 loff_t size; 174 struct kernel_lb_addr eloc; 175 uint32_t elen; 176 sector_t offset; 177 struct extent_position epos = {}; 178 struct udf_inode_info *dinfo = UDF_I(dir); 179 int isdotdot = child->len == 2 && 180 child->name[0] == '.' && child->name[1] == '.'; 181 struct super_block *sb = dir->i_sb; 182 183 size = udf_ext0_offset(dir) + dir->i_size; 184 f_pos = udf_ext0_offset(dir); 185 186 fibh->sbh = fibh->ebh = NULL; 187 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); 188 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 189 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, 190 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 191 fi = ERR_PTR(-EIO); 192 goto out_err; 193 } 194 195 block = udf_get_lb_pblock(sb, &eloc, offset); 196 if ((++offset << sb->s_blocksize_bits) < elen) { 197 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 198 epos.offset -= sizeof(struct short_ad); 199 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 200 epos.offset -= sizeof(struct long_ad); 201 } else 202 offset = 0; 203 204 fibh->sbh = fibh->ebh = udf_tread(sb, block); 205 if (!fibh->sbh) { 206 fi = ERR_PTR(-EIO); 207 goto out_err; 208 } 209 } 210 211 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 212 if (!fname) { 213 fi = ERR_PTR(-ENOMEM); 214 goto out_err; 215 } 216 217 while (f_pos < size) { 218 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 219 &elen, &offset); 220 if (!fi) { 221 fi = ERR_PTR(-EIO); 222 goto out_err; 223 } 224 225 liu = le16_to_cpu(cfi->lengthOfImpUse); 226 lfi = cfi->lengthFileIdent; 227 228 if (fibh->sbh == fibh->ebh) { 229 nameptr = fi->fileIdent + liu; 230 } else { 231 int poffset; /* Unpaded ending offset */ 232 233 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + 234 liu + lfi; 235 236 if (poffset >= lfi) 237 nameptr = (uint8_t *)(fibh->ebh->b_data + 238 poffset - lfi); 239 else { 240 if (!copy_name) { 241 copy_name = kmalloc(UDF_NAME_LEN, 242 GFP_NOFS); 243 if (!copy_name) { 244 fi = ERR_PTR(-ENOMEM); 245 goto out_err; 246 } 247 } 248 nameptr = copy_name; 249 memcpy(nameptr, fi->fileIdent + liu, 250 lfi - poffset); 251 memcpy(nameptr + lfi - poffset, 252 fibh->ebh->b_data, poffset); 253 } 254 } 255 256 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 257 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 258 continue; 259 } 260 261 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { 262 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 263 continue; 264 } 265 266 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && 267 isdotdot) 268 goto out_ok; 269 270 if (!lfi) 271 continue; 272 273 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); 274 if (flen < 0) { 275 fi = ERR_PTR(flen); 276 goto out_err; 277 } 278 279 if (udf_match(flen, fname, child->len, child->name)) 280 goto out_ok; 281 } 282 283 fi = NULL; 284 out_err: 285 if (fibh->sbh != fibh->ebh) 286 brelse(fibh->ebh); 287 brelse(fibh->sbh); 288 out_ok: 289 brelse(epos.bh); 290 kfree(fname); 291 kfree(copy_name); 292 293 return fi; 294 } 295 296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 297 unsigned int flags) 298 { 299 struct inode *inode = NULL; 300 struct fileIdentDesc cfi; 301 struct udf_fileident_bh fibh; 302 struct fileIdentDesc *fi; 303 304 if (dentry->d_name.len > UDF_NAME_LEN) 305 return ERR_PTR(-ENAMETOOLONG); 306 307 #ifdef UDF_RECOVERY 308 /* temporary shorthand for specifying files by inode number */ 309 if (!strncmp(dentry->d_name.name, ".B=", 3)) { 310 struct kernel_lb_addr lb = { 311 .logicalBlockNum = 0, 312 .partitionReferenceNum = 313 simple_strtoul(dentry->d_name.name + 3, 314 NULL, 0), 315 }; 316 inode = udf_iget(dir->i_sb, lb); 317 if (IS_ERR(inode)) 318 return inode; 319 } else 320 #endif /* UDF_RECOVERY */ 321 322 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 323 if (IS_ERR(fi)) 324 return ERR_CAST(fi); 325 326 if (fi) { 327 struct kernel_lb_addr loc; 328 329 if (fibh.sbh != fibh.ebh) 330 brelse(fibh.ebh); 331 brelse(fibh.sbh); 332 333 loc = lelb_to_cpu(cfi.icb.extLocation); 334 inode = udf_iget(dir->i_sb, &loc); 335 if (IS_ERR(inode)) 336 return ERR_CAST(inode); 337 } 338 339 return d_splice_alias(inode, dentry); 340 } 341 342 static struct fileIdentDesc *udf_add_entry(struct inode *dir, 343 struct dentry *dentry, 344 struct udf_fileident_bh *fibh, 345 struct fileIdentDesc *cfi, int *err) 346 { 347 struct super_block *sb = dir->i_sb; 348 struct fileIdentDesc *fi = NULL; 349 unsigned char *name = NULL; 350 int namelen; 351 loff_t f_pos; 352 loff_t size = udf_ext0_offset(dir) + dir->i_size; 353 int nfidlen; 354 udf_pblk_t block; 355 struct kernel_lb_addr eloc; 356 uint32_t elen = 0; 357 sector_t offset; 358 struct extent_position epos = {}; 359 struct udf_inode_info *dinfo; 360 361 fibh->sbh = fibh->ebh = NULL; 362 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 363 if (!name) { 364 *err = -ENOMEM; 365 goto out_err; 366 } 367 368 if (dentry) { 369 if (!dentry->d_name.len) { 370 *err = -EINVAL; 371 goto out_err; 372 } 373 namelen = udf_put_filename(sb, dentry->d_name.name, 374 dentry->d_name.len, 375 name, UDF_NAME_LEN_CS0); 376 if (!namelen) { 377 *err = -ENAMETOOLONG; 378 goto out_err; 379 } 380 } else { 381 namelen = 0; 382 } 383 384 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 385 386 f_pos = udf_ext0_offset(dir); 387 388 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 389 dinfo = UDF_I(dir); 390 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 391 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 392 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 393 block = udf_get_lb_pblock(dir->i_sb, 394 &dinfo->i_location, 0); 395 fibh->soffset = fibh->eoffset = sb->s_blocksize; 396 goto add; 397 } 398 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 399 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 400 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 401 epos.offset -= sizeof(struct short_ad); 402 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 403 epos.offset -= sizeof(struct long_ad); 404 } else 405 offset = 0; 406 407 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 408 if (!fibh->sbh) { 409 *err = -EIO; 410 goto out_err; 411 } 412 413 block = dinfo->i_location.logicalBlockNum; 414 } 415 416 while (f_pos < size) { 417 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 418 &elen, &offset); 419 420 if (!fi) { 421 *err = -EIO; 422 goto out_err; 423 } 424 425 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 426 if (udf_dir_entry_len(cfi) == nfidlen) { 427 cfi->descTag.tagSerialNum = cpu_to_le16(1); 428 cfi->fileVersionNum = cpu_to_le16(1); 429 cfi->fileCharacteristics = 0; 430 cfi->lengthFileIdent = namelen; 431 cfi->lengthOfImpUse = cpu_to_le16(0); 432 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 433 name)) 434 goto out_ok; 435 else { 436 *err = -EIO; 437 goto out_err; 438 } 439 } 440 } 441 } 442 443 add: 444 f_pos += nfidlen; 445 446 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 447 sb->s_blocksize - fibh->eoffset < nfidlen) { 448 brelse(epos.bh); 449 epos.bh = NULL; 450 fibh->soffset -= udf_ext0_offset(dir); 451 fibh->eoffset -= udf_ext0_offset(dir); 452 f_pos -= udf_ext0_offset(dir); 453 if (fibh->sbh != fibh->ebh) 454 brelse(fibh->ebh); 455 brelse(fibh->sbh); 456 fibh->sbh = fibh->ebh = 457 udf_expand_dir_adinicb(dir, &block, err); 458 if (!fibh->sbh) 459 goto out_err; 460 epos.block = dinfo->i_location; 461 epos.offset = udf_file_entry_alloc_offset(dir); 462 /* Load extent udf_expand_dir_adinicb() has created */ 463 udf_current_aext(dir, &epos, &eloc, &elen, 1); 464 } 465 466 /* Entry fits into current block? */ 467 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 468 fibh->soffset = fibh->eoffset; 469 fibh->eoffset += nfidlen; 470 if (fibh->sbh != fibh->ebh) { 471 brelse(fibh->sbh); 472 fibh->sbh = fibh->ebh; 473 } 474 475 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 476 block = dinfo->i_location.logicalBlockNum; 477 fi = (struct fileIdentDesc *) 478 (dinfo->i_ext.i_data + 479 fibh->soffset - 480 udf_ext0_offset(dir) + 481 dinfo->i_lenEAttr); 482 } else { 483 block = eloc.logicalBlockNum + 484 ((elen - 1) >> 485 dir->i_sb->s_blocksize_bits); 486 fi = (struct fileIdentDesc *) 487 (fibh->sbh->b_data + fibh->soffset); 488 } 489 } else { 490 /* Round up last extent in the file */ 491 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 492 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 493 epos.offset -= sizeof(struct short_ad); 494 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 495 epos.offset -= sizeof(struct long_ad); 496 udf_write_aext(dir, &epos, &eloc, elen, 1); 497 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize 498 - 1) & ~(sb->s_blocksize - 1); 499 500 fibh->soffset = fibh->eoffset - sb->s_blocksize; 501 fibh->eoffset += nfidlen - sb->s_blocksize; 502 if (fibh->sbh != fibh->ebh) { 503 brelse(fibh->sbh); 504 fibh->sbh = fibh->ebh; 505 } 506 507 block = eloc.logicalBlockNum + ((elen - 1) >> 508 dir->i_sb->s_blocksize_bits); 509 fibh->ebh = udf_bread(dir, 510 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 511 if (!fibh->ebh) 512 goto out_err; 513 /* Extents could have been merged, invalidate our position */ 514 brelse(epos.bh); 515 epos.bh = NULL; 516 epos.block = dinfo->i_location; 517 epos.offset = udf_file_entry_alloc_offset(dir); 518 519 if (!fibh->soffset) { 520 /* Find the freshly allocated block */ 521 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 522 (EXT_RECORDED_ALLOCATED >> 30)) 523 ; 524 block = eloc.logicalBlockNum + ((elen - 1) >> 525 dir->i_sb->s_blocksize_bits); 526 brelse(fibh->sbh); 527 fibh->sbh = fibh->ebh; 528 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 529 } else { 530 fi = (struct fileIdentDesc *) 531 (fibh->sbh->b_data + sb->s_blocksize + 532 fibh->soffset); 533 } 534 } 535 536 memset(cfi, 0, sizeof(struct fileIdentDesc)); 537 if (UDF_SB(sb)->s_udfrev >= 0x0200) 538 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 539 sizeof(struct tag)); 540 else 541 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 542 sizeof(struct tag)); 543 cfi->fileVersionNum = cpu_to_le16(1); 544 cfi->lengthFileIdent = namelen; 545 cfi->lengthOfImpUse = cpu_to_le16(0); 546 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 547 dir->i_size += nfidlen; 548 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 549 dinfo->i_lenAlloc += nfidlen; 550 else { 551 /* Find the last extent and truncate it to proper size */ 552 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 553 (EXT_RECORDED_ALLOCATED >> 30)) 554 ; 555 elen -= dinfo->i_lenExtents - dir->i_size; 556 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 557 epos.offset -= sizeof(struct short_ad); 558 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 559 epos.offset -= sizeof(struct long_ad); 560 udf_write_aext(dir, &epos, &eloc, elen, 1); 561 dinfo->i_lenExtents = dir->i_size; 562 } 563 564 mark_inode_dirty(dir); 565 goto out_ok; 566 } else { 567 *err = -EIO; 568 goto out_err; 569 } 570 571 out_err: 572 fi = NULL; 573 if (fibh->sbh != fibh->ebh) 574 brelse(fibh->ebh); 575 brelse(fibh->sbh); 576 out_ok: 577 brelse(epos.bh); 578 kfree(name); 579 return fi; 580 } 581 582 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 583 struct udf_fileident_bh *fibh, 584 struct fileIdentDesc *cfi) 585 { 586 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 587 588 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 589 memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); 590 591 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 592 } 593 594 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 595 { 596 struct udf_inode_info *iinfo = UDF_I(inode); 597 struct inode *dir = d_inode(dentry->d_parent); 598 struct udf_fileident_bh fibh; 599 struct fileIdentDesc cfi, *fi; 600 int err; 601 602 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 603 if (unlikely(!fi)) { 604 inode_dec_link_count(inode); 605 unlock_new_inode(inode); 606 iput(inode); 607 return err; 608 } 609 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 610 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 611 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 612 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 613 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 614 dir->i_ctime = dir->i_mtime = current_time(dir); 615 mark_inode_dirty(dir); 616 if (fibh.sbh != fibh.ebh) 617 brelse(fibh.ebh); 618 brelse(fibh.sbh); 619 d_instantiate_new(dentry, inode); 620 621 return 0; 622 } 623 624 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode, 625 bool excl) 626 { 627 struct inode *inode = udf_new_inode(dir, mode); 628 629 if (IS_ERR(inode)) 630 return PTR_ERR(inode); 631 632 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 633 inode->i_data.a_ops = &udf_adinicb_aops; 634 else 635 inode->i_data.a_ops = &udf_aops; 636 inode->i_op = &udf_file_inode_operations; 637 inode->i_fop = &udf_file_operations; 638 mark_inode_dirty(inode); 639 640 return udf_add_nondir(dentry, inode); 641 } 642 643 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) 644 { 645 struct inode *inode = udf_new_inode(dir, mode); 646 647 if (IS_ERR(inode)) 648 return PTR_ERR(inode); 649 650 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 651 inode->i_data.a_ops = &udf_adinicb_aops; 652 else 653 inode->i_data.a_ops = &udf_aops; 654 inode->i_op = &udf_file_inode_operations; 655 inode->i_fop = &udf_file_operations; 656 mark_inode_dirty(inode); 657 d_tmpfile(dentry, inode); 658 unlock_new_inode(inode); 659 return 0; 660 } 661 662 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 663 dev_t rdev) 664 { 665 struct inode *inode; 666 667 if (!old_valid_dev(rdev)) 668 return -EINVAL; 669 670 inode = udf_new_inode(dir, mode); 671 if (IS_ERR(inode)) 672 return PTR_ERR(inode); 673 674 init_special_inode(inode, mode, rdev); 675 return udf_add_nondir(dentry, inode); 676 } 677 678 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 679 { 680 struct inode *inode; 681 struct udf_fileident_bh fibh; 682 struct fileIdentDesc cfi, *fi; 683 int err; 684 struct udf_inode_info *dinfo = UDF_I(dir); 685 struct udf_inode_info *iinfo; 686 687 inode = udf_new_inode(dir, S_IFDIR | mode); 688 if (IS_ERR(inode)) 689 return PTR_ERR(inode); 690 691 iinfo = UDF_I(inode); 692 inode->i_op = &udf_dir_inode_operations; 693 inode->i_fop = &udf_dir_operations; 694 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 695 if (!fi) { 696 inode_dec_link_count(inode); 697 unlock_new_inode(inode); 698 iput(inode); 699 goto out; 700 } 701 set_nlink(inode, 2); 702 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 703 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 704 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 705 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 706 cfi.fileCharacteristics = 707 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 708 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 709 brelse(fibh.sbh); 710 mark_inode_dirty(inode); 711 712 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 713 if (!fi) { 714 clear_nlink(inode); 715 mark_inode_dirty(inode); 716 unlock_new_inode(inode); 717 iput(inode); 718 goto out; 719 } 720 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 721 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 722 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 723 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 724 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 725 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 726 inc_nlink(dir); 727 dir->i_ctime = dir->i_mtime = current_time(dir); 728 mark_inode_dirty(dir); 729 d_instantiate_new(dentry, inode); 730 if (fibh.sbh != fibh.ebh) 731 brelse(fibh.ebh); 732 brelse(fibh.sbh); 733 err = 0; 734 735 out: 736 return err; 737 } 738 739 static int empty_dir(struct inode *dir) 740 { 741 struct fileIdentDesc *fi, cfi; 742 struct udf_fileident_bh fibh; 743 loff_t f_pos; 744 loff_t size = udf_ext0_offset(dir) + dir->i_size; 745 udf_pblk_t block; 746 struct kernel_lb_addr eloc; 747 uint32_t elen; 748 sector_t offset; 749 struct extent_position epos = {}; 750 struct udf_inode_info *dinfo = UDF_I(dir); 751 752 f_pos = udf_ext0_offset(dir); 753 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 754 755 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 756 fibh.sbh = fibh.ebh = NULL; 757 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 758 &epos, &eloc, &elen, &offset) == 759 (EXT_RECORDED_ALLOCATED >> 30)) { 760 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 761 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 762 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 763 epos.offset -= sizeof(struct short_ad); 764 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 765 epos.offset -= sizeof(struct long_ad); 766 } else 767 offset = 0; 768 769 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 770 if (!fibh.sbh) { 771 brelse(epos.bh); 772 return 0; 773 } 774 } else { 775 brelse(epos.bh); 776 return 0; 777 } 778 779 while (f_pos < size) { 780 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 781 &elen, &offset); 782 if (!fi) { 783 if (fibh.sbh != fibh.ebh) 784 brelse(fibh.ebh); 785 brelse(fibh.sbh); 786 brelse(epos.bh); 787 return 0; 788 } 789 790 if (cfi.lengthFileIdent && 791 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 792 if (fibh.sbh != fibh.ebh) 793 brelse(fibh.ebh); 794 brelse(fibh.sbh); 795 brelse(epos.bh); 796 return 0; 797 } 798 } 799 800 if (fibh.sbh != fibh.ebh) 801 brelse(fibh.ebh); 802 brelse(fibh.sbh); 803 brelse(epos.bh); 804 805 return 1; 806 } 807 808 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 809 { 810 int retval; 811 struct inode *inode = d_inode(dentry); 812 struct udf_fileident_bh fibh; 813 struct fileIdentDesc *fi, cfi; 814 struct kernel_lb_addr tloc; 815 816 retval = -ENOENT; 817 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 818 if (IS_ERR_OR_NULL(fi)) { 819 if (fi) 820 retval = PTR_ERR(fi); 821 goto out; 822 } 823 824 retval = -EIO; 825 tloc = lelb_to_cpu(cfi.icb.extLocation); 826 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 827 goto end_rmdir; 828 retval = -ENOTEMPTY; 829 if (!empty_dir(inode)) 830 goto end_rmdir; 831 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 832 if (retval) 833 goto end_rmdir; 834 if (inode->i_nlink != 2) 835 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 836 inode->i_nlink); 837 clear_nlink(inode); 838 inode->i_size = 0; 839 inode_dec_link_count(dir); 840 inode->i_ctime = dir->i_ctime = dir->i_mtime = 841 current_time(inode); 842 mark_inode_dirty(dir); 843 844 end_rmdir: 845 if (fibh.sbh != fibh.ebh) 846 brelse(fibh.ebh); 847 brelse(fibh.sbh); 848 849 out: 850 return retval; 851 } 852 853 static int udf_unlink(struct inode *dir, struct dentry *dentry) 854 { 855 int retval; 856 struct inode *inode = d_inode(dentry); 857 struct udf_fileident_bh fibh; 858 struct fileIdentDesc *fi; 859 struct fileIdentDesc cfi; 860 struct kernel_lb_addr tloc; 861 862 retval = -ENOENT; 863 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 864 865 if (IS_ERR_OR_NULL(fi)) { 866 if (fi) 867 retval = PTR_ERR(fi); 868 goto out; 869 } 870 871 retval = -EIO; 872 tloc = lelb_to_cpu(cfi.icb.extLocation); 873 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 874 goto end_unlink; 875 876 if (!inode->i_nlink) { 877 udf_debug("Deleting nonexistent file (%lu), %u\n", 878 inode->i_ino, inode->i_nlink); 879 set_nlink(inode, 1); 880 } 881 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 882 if (retval) 883 goto end_unlink; 884 dir->i_ctime = dir->i_mtime = current_time(dir); 885 mark_inode_dirty(dir); 886 inode_dec_link_count(inode); 887 inode->i_ctime = dir->i_ctime; 888 retval = 0; 889 890 end_unlink: 891 if (fibh.sbh != fibh.ebh) 892 brelse(fibh.ebh); 893 brelse(fibh.sbh); 894 895 out: 896 return retval; 897 } 898 899 static int udf_symlink(struct inode *dir, struct dentry *dentry, 900 const char *symname) 901 { 902 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 903 struct pathComponent *pc; 904 const char *compstart; 905 struct extent_position epos = {}; 906 int eoffset, elen = 0; 907 uint8_t *ea; 908 int err; 909 udf_pblk_t block; 910 unsigned char *name = NULL; 911 int namelen; 912 struct udf_inode_info *iinfo; 913 struct super_block *sb = dir->i_sb; 914 915 if (IS_ERR(inode)) 916 return PTR_ERR(inode); 917 918 iinfo = UDF_I(inode); 919 down_write(&iinfo->i_data_sem); 920 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 921 if (!name) { 922 err = -ENOMEM; 923 goto out_no_entry; 924 } 925 926 inode->i_data.a_ops = &udf_symlink_aops; 927 inode->i_op = &udf_symlink_inode_operations; 928 inode_nohighmem(inode); 929 930 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 931 struct kernel_lb_addr eloc; 932 uint32_t bsize; 933 934 block = udf_new_block(sb, inode, 935 iinfo->i_location.partitionReferenceNum, 936 iinfo->i_location.logicalBlockNum, &err); 937 if (!block) 938 goto out_no_entry; 939 epos.block = iinfo->i_location; 940 epos.offset = udf_file_entry_alloc_offset(inode); 941 epos.bh = NULL; 942 eloc.logicalBlockNum = block; 943 eloc.partitionReferenceNum = 944 iinfo->i_location.partitionReferenceNum; 945 bsize = sb->s_blocksize; 946 iinfo->i_lenExtents = bsize; 947 udf_add_aext(inode, &epos, &eloc, bsize, 0); 948 brelse(epos.bh); 949 950 block = udf_get_pblock(sb, block, 951 iinfo->i_location.partitionReferenceNum, 952 0); 953 epos.bh = udf_tgetblk(sb, block); 954 lock_buffer(epos.bh); 955 memset(epos.bh->b_data, 0x00, bsize); 956 set_buffer_uptodate(epos.bh); 957 unlock_buffer(epos.bh); 958 mark_buffer_dirty_inode(epos.bh, inode); 959 ea = epos.bh->b_data + udf_ext0_offset(inode); 960 } else 961 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; 962 963 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 964 pc = (struct pathComponent *)ea; 965 966 if (*symname == '/') { 967 do { 968 symname++; 969 } while (*symname == '/'); 970 971 pc->componentType = 1; 972 pc->lengthComponentIdent = 0; 973 pc->componentFileVersionNum = 0; 974 elen += sizeof(struct pathComponent); 975 } 976 977 err = -ENAMETOOLONG; 978 979 while (*symname) { 980 if (elen + sizeof(struct pathComponent) > eoffset) 981 goto out_no_entry; 982 983 pc = (struct pathComponent *)(ea + elen); 984 985 compstart = symname; 986 987 do { 988 symname++; 989 } while (*symname && *symname != '/'); 990 991 pc->componentType = 5; 992 pc->lengthComponentIdent = 0; 993 pc->componentFileVersionNum = 0; 994 if (compstart[0] == '.') { 995 if ((symname - compstart) == 1) 996 pc->componentType = 4; 997 else if ((symname - compstart) == 2 && 998 compstart[1] == '.') 999 pc->componentType = 3; 1000 } 1001 1002 if (pc->componentType == 5) { 1003 namelen = udf_put_filename(sb, compstart, 1004 symname - compstart, 1005 name, UDF_NAME_LEN_CS0); 1006 if (!namelen) 1007 goto out_no_entry; 1008 1009 if (elen + sizeof(struct pathComponent) + namelen > 1010 eoffset) 1011 goto out_no_entry; 1012 else 1013 pc->lengthComponentIdent = namelen; 1014 1015 memcpy(pc->componentIdent, name, namelen); 1016 } 1017 1018 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1019 1020 if (*symname) { 1021 do { 1022 symname++; 1023 } while (*symname == '/'); 1024 } 1025 } 1026 1027 brelse(epos.bh); 1028 inode->i_size = elen; 1029 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1030 iinfo->i_lenAlloc = inode->i_size; 1031 else 1032 udf_truncate_tail_extent(inode); 1033 mark_inode_dirty(inode); 1034 up_write(&iinfo->i_data_sem); 1035 1036 err = udf_add_nondir(dentry, inode); 1037 out: 1038 kfree(name); 1039 return err; 1040 1041 out_no_entry: 1042 up_write(&iinfo->i_data_sem); 1043 inode_dec_link_count(inode); 1044 unlock_new_inode(inode); 1045 iput(inode); 1046 goto out; 1047 } 1048 1049 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1050 struct dentry *dentry) 1051 { 1052 struct inode *inode = d_inode(old_dentry); 1053 struct udf_fileident_bh fibh; 1054 struct fileIdentDesc cfi, *fi; 1055 int err; 1056 1057 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1058 if (!fi) { 1059 return err; 1060 } 1061 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1062 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1063 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1064 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1065 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1066 } 1067 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1068 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1069 mark_inode_dirty(dir); 1070 1071 if (fibh.sbh != fibh.ebh) 1072 brelse(fibh.ebh); 1073 brelse(fibh.sbh); 1074 inc_nlink(inode); 1075 inode->i_ctime = current_time(inode); 1076 mark_inode_dirty(inode); 1077 dir->i_ctime = dir->i_mtime = current_time(dir); 1078 mark_inode_dirty(dir); 1079 ihold(inode); 1080 d_instantiate(dentry, inode); 1081 1082 return 0; 1083 } 1084 1085 /* Anybody can rename anything with this: the permission checks are left to the 1086 * higher-level routines. 1087 */ 1088 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 1089 struct inode *new_dir, struct dentry *new_dentry, 1090 unsigned int flags) 1091 { 1092 struct inode *old_inode = d_inode(old_dentry); 1093 struct inode *new_inode = d_inode(new_dentry); 1094 struct udf_fileident_bh ofibh, nfibh; 1095 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1096 struct fileIdentDesc ocfi, ncfi; 1097 struct buffer_head *dir_bh = NULL; 1098 int retval = -ENOENT; 1099 struct kernel_lb_addr tloc; 1100 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1101 1102 if (flags & ~RENAME_NOREPLACE) 1103 return -EINVAL; 1104 1105 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1106 if (IS_ERR(ofi)) { 1107 retval = PTR_ERR(ofi); 1108 goto end_rename; 1109 } 1110 1111 if (ofibh.sbh != ofibh.ebh) 1112 brelse(ofibh.ebh); 1113 1114 brelse(ofibh.sbh); 1115 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1116 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1117 != old_inode->i_ino) 1118 goto end_rename; 1119 1120 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1121 if (IS_ERR(nfi)) { 1122 retval = PTR_ERR(nfi); 1123 goto end_rename; 1124 } 1125 if (nfi && !new_inode) { 1126 if (nfibh.sbh != nfibh.ebh) 1127 brelse(nfibh.ebh); 1128 brelse(nfibh.sbh); 1129 nfi = NULL; 1130 } 1131 if (S_ISDIR(old_inode->i_mode)) { 1132 int offset = udf_ext0_offset(old_inode); 1133 1134 if (new_inode) { 1135 retval = -ENOTEMPTY; 1136 if (!empty_dir(new_inode)) 1137 goto end_rename; 1138 } 1139 retval = -EIO; 1140 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1141 dir_fi = udf_get_fileident( 1142 old_iinfo->i_ext.i_data - 1143 (old_iinfo->i_efe ? 1144 sizeof(struct extendedFileEntry) : 1145 sizeof(struct fileEntry)), 1146 old_inode->i_sb->s_blocksize, &offset); 1147 } else { 1148 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1149 if (!dir_bh) 1150 goto end_rename; 1151 dir_fi = udf_get_fileident(dir_bh->b_data, 1152 old_inode->i_sb->s_blocksize, &offset); 1153 } 1154 if (!dir_fi) 1155 goto end_rename; 1156 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1157 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1158 old_dir->i_ino) 1159 goto end_rename; 1160 } 1161 if (!nfi) { 1162 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1163 &retval); 1164 if (!nfi) 1165 goto end_rename; 1166 } 1167 1168 /* 1169 * Like most other Unix systems, set the ctime for inodes on a 1170 * rename. 1171 */ 1172 old_inode->i_ctime = current_time(old_inode); 1173 mark_inode_dirty(old_inode); 1174 1175 /* 1176 * ok, that's it 1177 */ 1178 ncfi.fileVersionNum = ocfi.fileVersionNum; 1179 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1180 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1181 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1182 1183 /* The old fid may have moved - find it again */ 1184 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1185 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1186 1187 if (new_inode) { 1188 new_inode->i_ctime = current_time(new_inode); 1189 inode_dec_link_count(new_inode); 1190 } 1191 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1192 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1193 mark_inode_dirty(old_dir); 1194 mark_inode_dirty(new_dir); 1195 1196 if (dir_fi) { 1197 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1198 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1199 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1200 mark_inode_dirty(old_inode); 1201 else 1202 mark_buffer_dirty_inode(dir_bh, old_inode); 1203 1204 inode_dec_link_count(old_dir); 1205 if (new_inode) 1206 inode_dec_link_count(new_inode); 1207 else { 1208 inc_nlink(new_dir); 1209 mark_inode_dirty(new_dir); 1210 } 1211 } 1212 1213 if (ofi) { 1214 if (ofibh.sbh != ofibh.ebh) 1215 brelse(ofibh.ebh); 1216 brelse(ofibh.sbh); 1217 } 1218 1219 retval = 0; 1220 1221 end_rename: 1222 brelse(dir_bh); 1223 if (nfi) { 1224 if (nfibh.sbh != nfibh.ebh) 1225 brelse(nfibh.ebh); 1226 brelse(nfibh.sbh); 1227 } 1228 1229 return retval; 1230 } 1231 1232 static struct dentry *udf_get_parent(struct dentry *child) 1233 { 1234 struct kernel_lb_addr tloc; 1235 struct inode *inode = NULL; 1236 struct qstr dotdot = QSTR_INIT("..", 2); 1237 struct fileIdentDesc cfi; 1238 struct udf_fileident_bh fibh; 1239 1240 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi)) 1241 return ERR_PTR(-EACCES); 1242 1243 if (fibh.sbh != fibh.ebh) 1244 brelse(fibh.ebh); 1245 brelse(fibh.sbh); 1246 1247 tloc = lelb_to_cpu(cfi.icb.extLocation); 1248 inode = udf_iget(child->d_sb, &tloc); 1249 if (IS_ERR(inode)) 1250 return ERR_CAST(inode); 1251 1252 return d_obtain_alias(inode); 1253 } 1254 1255 1256 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1257 u16 partref, __u32 generation) 1258 { 1259 struct inode *inode; 1260 struct kernel_lb_addr loc; 1261 1262 if (block == 0) 1263 return ERR_PTR(-ESTALE); 1264 1265 loc.logicalBlockNum = block; 1266 loc.partitionReferenceNum = partref; 1267 inode = udf_iget(sb, &loc); 1268 1269 if (IS_ERR(inode)) 1270 return ERR_CAST(inode); 1271 1272 if (generation && inode->i_generation != generation) { 1273 iput(inode); 1274 return ERR_PTR(-ESTALE); 1275 } 1276 return d_obtain_alias(inode); 1277 } 1278 1279 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1280 struct fid *fid, int fh_len, int fh_type) 1281 { 1282 if (fh_len < 3 || 1283 (fh_type != FILEID_UDF_WITH_PARENT && 1284 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1285 return NULL; 1286 1287 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1288 fid->udf.generation); 1289 } 1290 1291 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1292 struct fid *fid, int fh_len, int fh_type) 1293 { 1294 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1295 return NULL; 1296 1297 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1298 fid->udf.parent_partref, 1299 fid->udf.parent_generation); 1300 } 1301 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1302 struct inode *parent) 1303 { 1304 int len = *lenp; 1305 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1306 struct fid *fid = (struct fid *)fh; 1307 int type = FILEID_UDF_WITHOUT_PARENT; 1308 1309 if (parent && (len < 5)) { 1310 *lenp = 5; 1311 return FILEID_INVALID; 1312 } else if (len < 3) { 1313 *lenp = 3; 1314 return FILEID_INVALID; 1315 } 1316 1317 *lenp = 3; 1318 fid->udf.block = location.logicalBlockNum; 1319 fid->udf.partref = location.partitionReferenceNum; 1320 fid->udf.parent_partref = 0; 1321 fid->udf.generation = inode->i_generation; 1322 1323 if (parent) { 1324 location = UDF_I(parent)->i_location; 1325 fid->udf.parent_block = location.logicalBlockNum; 1326 fid->udf.parent_partref = location.partitionReferenceNum; 1327 fid->udf.parent_generation = inode->i_generation; 1328 *lenp = 5; 1329 type = FILEID_UDF_WITH_PARENT; 1330 } 1331 1332 return type; 1333 } 1334 1335 const struct export_operations udf_export_ops = { 1336 .encode_fh = udf_encode_fh, 1337 .fh_to_dentry = udf_fh_to_dentry, 1338 .fh_to_parent = udf_fh_to_parent, 1339 .get_parent = udf_get_parent, 1340 }; 1341 1342 const struct inode_operations udf_dir_inode_operations = { 1343 .lookup = udf_lookup, 1344 .create = udf_create, 1345 .link = udf_link, 1346 .unlink = udf_unlink, 1347 .symlink = udf_symlink, 1348 .mkdir = udf_mkdir, 1349 .rmdir = udf_rmdir, 1350 .mknod = udf_mknod, 1351 .rename = udf_rename, 1352 .tmpfile = udf_tmpfile, 1353 }; 1354