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 discard_new_inode(inode); 606 return err; 607 } 608 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 609 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 610 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 611 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 612 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 613 dir->i_ctime = dir->i_mtime = current_time(dir); 614 mark_inode_dirty(dir); 615 if (fibh.sbh != fibh.ebh) 616 brelse(fibh.ebh); 617 brelse(fibh.sbh); 618 d_instantiate_new(dentry, inode); 619 620 return 0; 621 } 622 623 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode, 624 bool excl) 625 { 626 struct inode *inode = udf_new_inode(dir, mode); 627 628 if (IS_ERR(inode)) 629 return PTR_ERR(inode); 630 631 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 632 inode->i_data.a_ops = &udf_adinicb_aops; 633 else 634 inode->i_data.a_ops = &udf_aops; 635 inode->i_op = &udf_file_inode_operations; 636 inode->i_fop = &udf_file_operations; 637 mark_inode_dirty(inode); 638 639 return udf_add_nondir(dentry, inode); 640 } 641 642 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) 643 { 644 struct inode *inode = udf_new_inode(dir, mode); 645 646 if (IS_ERR(inode)) 647 return PTR_ERR(inode); 648 649 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 650 inode->i_data.a_ops = &udf_adinicb_aops; 651 else 652 inode->i_data.a_ops = &udf_aops; 653 inode->i_op = &udf_file_inode_operations; 654 inode->i_fop = &udf_file_operations; 655 mark_inode_dirty(inode); 656 d_tmpfile(dentry, inode); 657 unlock_new_inode(inode); 658 return 0; 659 } 660 661 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 662 dev_t rdev) 663 { 664 struct inode *inode; 665 666 if (!old_valid_dev(rdev)) 667 return -EINVAL; 668 669 inode = udf_new_inode(dir, mode); 670 if (IS_ERR(inode)) 671 return PTR_ERR(inode); 672 673 init_special_inode(inode, mode, rdev); 674 return udf_add_nondir(dentry, inode); 675 } 676 677 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 678 { 679 struct inode *inode; 680 struct udf_fileident_bh fibh; 681 struct fileIdentDesc cfi, *fi; 682 int err; 683 struct udf_inode_info *dinfo = UDF_I(dir); 684 struct udf_inode_info *iinfo; 685 686 inode = udf_new_inode(dir, S_IFDIR | mode); 687 if (IS_ERR(inode)) 688 return PTR_ERR(inode); 689 690 iinfo = UDF_I(inode); 691 inode->i_op = &udf_dir_inode_operations; 692 inode->i_fop = &udf_dir_operations; 693 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 694 if (!fi) { 695 inode_dec_link_count(inode); 696 discard_new_inode(inode); 697 goto out; 698 } 699 set_nlink(inode, 2); 700 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 701 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 702 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 703 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 704 cfi.fileCharacteristics = 705 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 706 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 707 brelse(fibh.sbh); 708 mark_inode_dirty(inode); 709 710 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 711 if (!fi) { 712 clear_nlink(inode); 713 mark_inode_dirty(inode); 714 discard_new_inode(inode); 715 goto out; 716 } 717 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 718 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 719 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 720 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 721 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 722 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 723 inc_nlink(dir); 724 dir->i_ctime = dir->i_mtime = current_time(dir); 725 mark_inode_dirty(dir); 726 d_instantiate_new(dentry, inode); 727 if (fibh.sbh != fibh.ebh) 728 brelse(fibh.ebh); 729 brelse(fibh.sbh); 730 err = 0; 731 732 out: 733 return err; 734 } 735 736 static int empty_dir(struct inode *dir) 737 { 738 struct fileIdentDesc *fi, cfi; 739 struct udf_fileident_bh fibh; 740 loff_t f_pos; 741 loff_t size = udf_ext0_offset(dir) + dir->i_size; 742 udf_pblk_t block; 743 struct kernel_lb_addr eloc; 744 uint32_t elen; 745 sector_t offset; 746 struct extent_position epos = {}; 747 struct udf_inode_info *dinfo = UDF_I(dir); 748 749 f_pos = udf_ext0_offset(dir); 750 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 751 752 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 753 fibh.sbh = fibh.ebh = NULL; 754 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 755 &epos, &eloc, &elen, &offset) == 756 (EXT_RECORDED_ALLOCATED >> 30)) { 757 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 758 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 759 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 760 epos.offset -= sizeof(struct short_ad); 761 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 762 epos.offset -= sizeof(struct long_ad); 763 } else 764 offset = 0; 765 766 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 767 if (!fibh.sbh) { 768 brelse(epos.bh); 769 return 0; 770 } 771 } else { 772 brelse(epos.bh); 773 return 0; 774 } 775 776 while (f_pos < size) { 777 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 778 &elen, &offset); 779 if (!fi) { 780 if (fibh.sbh != fibh.ebh) 781 brelse(fibh.ebh); 782 brelse(fibh.sbh); 783 brelse(epos.bh); 784 return 0; 785 } 786 787 if (cfi.lengthFileIdent && 788 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 789 if (fibh.sbh != fibh.ebh) 790 brelse(fibh.ebh); 791 brelse(fibh.sbh); 792 brelse(epos.bh); 793 return 0; 794 } 795 } 796 797 if (fibh.sbh != fibh.ebh) 798 brelse(fibh.ebh); 799 brelse(fibh.sbh); 800 brelse(epos.bh); 801 802 return 1; 803 } 804 805 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 806 { 807 int retval; 808 struct inode *inode = d_inode(dentry); 809 struct udf_fileident_bh fibh; 810 struct fileIdentDesc *fi, cfi; 811 struct kernel_lb_addr tloc; 812 813 retval = -ENOENT; 814 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 815 if (IS_ERR_OR_NULL(fi)) { 816 if (fi) 817 retval = PTR_ERR(fi); 818 goto out; 819 } 820 821 retval = -EIO; 822 tloc = lelb_to_cpu(cfi.icb.extLocation); 823 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 824 goto end_rmdir; 825 retval = -ENOTEMPTY; 826 if (!empty_dir(inode)) 827 goto end_rmdir; 828 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 829 if (retval) 830 goto end_rmdir; 831 if (inode->i_nlink != 2) 832 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 833 inode->i_nlink); 834 clear_nlink(inode); 835 inode->i_size = 0; 836 inode_dec_link_count(dir); 837 inode->i_ctime = dir->i_ctime = dir->i_mtime = 838 current_time(inode); 839 mark_inode_dirty(dir); 840 841 end_rmdir: 842 if (fibh.sbh != fibh.ebh) 843 brelse(fibh.ebh); 844 brelse(fibh.sbh); 845 846 out: 847 return retval; 848 } 849 850 static int udf_unlink(struct inode *dir, struct dentry *dentry) 851 { 852 int retval; 853 struct inode *inode = d_inode(dentry); 854 struct udf_fileident_bh fibh; 855 struct fileIdentDesc *fi; 856 struct fileIdentDesc cfi; 857 struct kernel_lb_addr tloc; 858 859 retval = -ENOENT; 860 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 861 862 if (IS_ERR_OR_NULL(fi)) { 863 if (fi) 864 retval = PTR_ERR(fi); 865 goto out; 866 } 867 868 retval = -EIO; 869 tloc = lelb_to_cpu(cfi.icb.extLocation); 870 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 871 goto end_unlink; 872 873 if (!inode->i_nlink) { 874 udf_debug("Deleting nonexistent file (%lu), %u\n", 875 inode->i_ino, inode->i_nlink); 876 set_nlink(inode, 1); 877 } 878 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 879 if (retval) 880 goto end_unlink; 881 dir->i_ctime = dir->i_mtime = current_time(dir); 882 mark_inode_dirty(dir); 883 inode_dec_link_count(inode); 884 inode->i_ctime = dir->i_ctime; 885 retval = 0; 886 887 end_unlink: 888 if (fibh.sbh != fibh.ebh) 889 brelse(fibh.ebh); 890 brelse(fibh.sbh); 891 892 out: 893 return retval; 894 } 895 896 static int udf_symlink(struct inode *dir, struct dentry *dentry, 897 const char *symname) 898 { 899 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 900 struct pathComponent *pc; 901 const char *compstart; 902 struct extent_position epos = {}; 903 int eoffset, elen = 0; 904 uint8_t *ea; 905 int err; 906 udf_pblk_t block; 907 unsigned char *name = NULL; 908 int namelen; 909 struct udf_inode_info *iinfo; 910 struct super_block *sb = dir->i_sb; 911 912 if (IS_ERR(inode)) 913 return PTR_ERR(inode); 914 915 iinfo = UDF_I(inode); 916 down_write(&iinfo->i_data_sem); 917 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 918 if (!name) { 919 err = -ENOMEM; 920 goto out_no_entry; 921 } 922 923 inode->i_data.a_ops = &udf_symlink_aops; 924 inode->i_op = &udf_symlink_inode_operations; 925 inode_nohighmem(inode); 926 927 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 928 struct kernel_lb_addr eloc; 929 uint32_t bsize; 930 931 block = udf_new_block(sb, inode, 932 iinfo->i_location.partitionReferenceNum, 933 iinfo->i_location.logicalBlockNum, &err); 934 if (!block) 935 goto out_no_entry; 936 epos.block = iinfo->i_location; 937 epos.offset = udf_file_entry_alloc_offset(inode); 938 epos.bh = NULL; 939 eloc.logicalBlockNum = block; 940 eloc.partitionReferenceNum = 941 iinfo->i_location.partitionReferenceNum; 942 bsize = sb->s_blocksize; 943 iinfo->i_lenExtents = bsize; 944 udf_add_aext(inode, &epos, &eloc, bsize, 0); 945 brelse(epos.bh); 946 947 block = udf_get_pblock(sb, block, 948 iinfo->i_location.partitionReferenceNum, 949 0); 950 epos.bh = udf_tgetblk(sb, block); 951 lock_buffer(epos.bh); 952 memset(epos.bh->b_data, 0x00, bsize); 953 set_buffer_uptodate(epos.bh); 954 unlock_buffer(epos.bh); 955 mark_buffer_dirty_inode(epos.bh, inode); 956 ea = epos.bh->b_data + udf_ext0_offset(inode); 957 } else 958 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; 959 960 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 961 pc = (struct pathComponent *)ea; 962 963 if (*symname == '/') { 964 do { 965 symname++; 966 } while (*symname == '/'); 967 968 pc->componentType = 1; 969 pc->lengthComponentIdent = 0; 970 pc->componentFileVersionNum = 0; 971 elen += sizeof(struct pathComponent); 972 } 973 974 err = -ENAMETOOLONG; 975 976 while (*symname) { 977 if (elen + sizeof(struct pathComponent) > eoffset) 978 goto out_no_entry; 979 980 pc = (struct pathComponent *)(ea + elen); 981 982 compstart = symname; 983 984 do { 985 symname++; 986 } while (*symname && *symname != '/'); 987 988 pc->componentType = 5; 989 pc->lengthComponentIdent = 0; 990 pc->componentFileVersionNum = 0; 991 if (compstart[0] == '.') { 992 if ((symname - compstart) == 1) 993 pc->componentType = 4; 994 else if ((symname - compstart) == 2 && 995 compstart[1] == '.') 996 pc->componentType = 3; 997 } 998 999 if (pc->componentType == 5) { 1000 namelen = udf_put_filename(sb, compstart, 1001 symname - compstart, 1002 name, UDF_NAME_LEN_CS0); 1003 if (!namelen) 1004 goto out_no_entry; 1005 1006 if (elen + sizeof(struct pathComponent) + namelen > 1007 eoffset) 1008 goto out_no_entry; 1009 else 1010 pc->lengthComponentIdent = namelen; 1011 1012 memcpy(pc->componentIdent, name, namelen); 1013 } 1014 1015 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1016 1017 if (*symname) { 1018 do { 1019 symname++; 1020 } while (*symname == '/'); 1021 } 1022 } 1023 1024 brelse(epos.bh); 1025 inode->i_size = elen; 1026 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1027 iinfo->i_lenAlloc = inode->i_size; 1028 else 1029 udf_truncate_tail_extent(inode); 1030 mark_inode_dirty(inode); 1031 up_write(&iinfo->i_data_sem); 1032 1033 err = udf_add_nondir(dentry, inode); 1034 out: 1035 kfree(name); 1036 return err; 1037 1038 out_no_entry: 1039 up_write(&iinfo->i_data_sem); 1040 inode_dec_link_count(inode); 1041 discard_new_inode(inode); 1042 goto out; 1043 } 1044 1045 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1046 struct dentry *dentry) 1047 { 1048 struct inode *inode = d_inode(old_dentry); 1049 struct udf_fileident_bh fibh; 1050 struct fileIdentDesc cfi, *fi; 1051 int err; 1052 1053 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1054 if (!fi) { 1055 return err; 1056 } 1057 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1058 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1059 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1060 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1061 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1062 } 1063 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1064 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1065 mark_inode_dirty(dir); 1066 1067 if (fibh.sbh != fibh.ebh) 1068 brelse(fibh.ebh); 1069 brelse(fibh.sbh); 1070 inc_nlink(inode); 1071 inode->i_ctime = current_time(inode); 1072 mark_inode_dirty(inode); 1073 dir->i_ctime = dir->i_mtime = current_time(dir); 1074 mark_inode_dirty(dir); 1075 ihold(inode); 1076 d_instantiate(dentry, inode); 1077 1078 return 0; 1079 } 1080 1081 /* Anybody can rename anything with this: the permission checks are left to the 1082 * higher-level routines. 1083 */ 1084 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 1085 struct inode *new_dir, struct dentry *new_dentry, 1086 unsigned int flags) 1087 { 1088 struct inode *old_inode = d_inode(old_dentry); 1089 struct inode *new_inode = d_inode(new_dentry); 1090 struct udf_fileident_bh ofibh, nfibh; 1091 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1092 struct fileIdentDesc ocfi, ncfi; 1093 struct buffer_head *dir_bh = NULL; 1094 int retval = -ENOENT; 1095 struct kernel_lb_addr tloc; 1096 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1097 1098 if (flags & ~RENAME_NOREPLACE) 1099 return -EINVAL; 1100 1101 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1102 if (IS_ERR(ofi)) { 1103 retval = PTR_ERR(ofi); 1104 goto end_rename; 1105 } 1106 1107 if (ofibh.sbh != ofibh.ebh) 1108 brelse(ofibh.ebh); 1109 1110 brelse(ofibh.sbh); 1111 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1112 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1113 != old_inode->i_ino) 1114 goto end_rename; 1115 1116 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1117 if (IS_ERR(nfi)) { 1118 retval = PTR_ERR(nfi); 1119 goto end_rename; 1120 } 1121 if (nfi && !new_inode) { 1122 if (nfibh.sbh != nfibh.ebh) 1123 brelse(nfibh.ebh); 1124 brelse(nfibh.sbh); 1125 nfi = NULL; 1126 } 1127 if (S_ISDIR(old_inode->i_mode)) { 1128 int offset = udf_ext0_offset(old_inode); 1129 1130 if (new_inode) { 1131 retval = -ENOTEMPTY; 1132 if (!empty_dir(new_inode)) 1133 goto end_rename; 1134 } 1135 retval = -EIO; 1136 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1137 dir_fi = udf_get_fileident( 1138 old_iinfo->i_ext.i_data - 1139 (old_iinfo->i_efe ? 1140 sizeof(struct extendedFileEntry) : 1141 sizeof(struct fileEntry)), 1142 old_inode->i_sb->s_blocksize, &offset); 1143 } else { 1144 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1145 if (!dir_bh) 1146 goto end_rename; 1147 dir_fi = udf_get_fileident(dir_bh->b_data, 1148 old_inode->i_sb->s_blocksize, &offset); 1149 } 1150 if (!dir_fi) 1151 goto end_rename; 1152 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1153 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1154 old_dir->i_ino) 1155 goto end_rename; 1156 } 1157 if (!nfi) { 1158 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1159 &retval); 1160 if (!nfi) 1161 goto end_rename; 1162 } 1163 1164 /* 1165 * Like most other Unix systems, set the ctime for inodes on a 1166 * rename. 1167 */ 1168 old_inode->i_ctime = current_time(old_inode); 1169 mark_inode_dirty(old_inode); 1170 1171 /* 1172 * ok, that's it 1173 */ 1174 ncfi.fileVersionNum = ocfi.fileVersionNum; 1175 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1176 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1177 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1178 1179 /* The old fid may have moved - find it again */ 1180 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1181 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1182 1183 if (new_inode) { 1184 new_inode->i_ctime = current_time(new_inode); 1185 inode_dec_link_count(new_inode); 1186 } 1187 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1188 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1189 mark_inode_dirty(old_dir); 1190 mark_inode_dirty(new_dir); 1191 1192 if (dir_fi) { 1193 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1194 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1195 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1196 mark_inode_dirty(old_inode); 1197 else 1198 mark_buffer_dirty_inode(dir_bh, old_inode); 1199 1200 inode_dec_link_count(old_dir); 1201 if (new_inode) 1202 inode_dec_link_count(new_inode); 1203 else { 1204 inc_nlink(new_dir); 1205 mark_inode_dirty(new_dir); 1206 } 1207 } 1208 1209 if (ofi) { 1210 if (ofibh.sbh != ofibh.ebh) 1211 brelse(ofibh.ebh); 1212 brelse(ofibh.sbh); 1213 } 1214 1215 retval = 0; 1216 1217 end_rename: 1218 brelse(dir_bh); 1219 if (nfi) { 1220 if (nfibh.sbh != nfibh.ebh) 1221 brelse(nfibh.ebh); 1222 brelse(nfibh.sbh); 1223 } 1224 1225 return retval; 1226 } 1227 1228 static struct dentry *udf_get_parent(struct dentry *child) 1229 { 1230 struct kernel_lb_addr tloc; 1231 struct inode *inode = NULL; 1232 struct qstr dotdot = QSTR_INIT("..", 2); 1233 struct fileIdentDesc cfi; 1234 struct udf_fileident_bh fibh; 1235 1236 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi)) 1237 return ERR_PTR(-EACCES); 1238 1239 if (fibh.sbh != fibh.ebh) 1240 brelse(fibh.ebh); 1241 brelse(fibh.sbh); 1242 1243 tloc = lelb_to_cpu(cfi.icb.extLocation); 1244 inode = udf_iget(child->d_sb, &tloc); 1245 if (IS_ERR(inode)) 1246 return ERR_CAST(inode); 1247 1248 return d_obtain_alias(inode); 1249 } 1250 1251 1252 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1253 u16 partref, __u32 generation) 1254 { 1255 struct inode *inode; 1256 struct kernel_lb_addr loc; 1257 1258 if (block == 0) 1259 return ERR_PTR(-ESTALE); 1260 1261 loc.logicalBlockNum = block; 1262 loc.partitionReferenceNum = partref; 1263 inode = udf_iget(sb, &loc); 1264 1265 if (IS_ERR(inode)) 1266 return ERR_CAST(inode); 1267 1268 if (generation && inode->i_generation != generation) { 1269 iput(inode); 1270 return ERR_PTR(-ESTALE); 1271 } 1272 return d_obtain_alias(inode); 1273 } 1274 1275 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1276 struct fid *fid, int fh_len, int fh_type) 1277 { 1278 if (fh_len < 3 || 1279 (fh_type != FILEID_UDF_WITH_PARENT && 1280 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1281 return NULL; 1282 1283 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1284 fid->udf.generation); 1285 } 1286 1287 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1288 struct fid *fid, int fh_len, int fh_type) 1289 { 1290 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1291 return NULL; 1292 1293 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1294 fid->udf.parent_partref, 1295 fid->udf.parent_generation); 1296 } 1297 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1298 struct inode *parent) 1299 { 1300 int len = *lenp; 1301 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1302 struct fid *fid = (struct fid *)fh; 1303 int type = FILEID_UDF_WITHOUT_PARENT; 1304 1305 if (parent && (len < 5)) { 1306 *lenp = 5; 1307 return FILEID_INVALID; 1308 } else if (len < 3) { 1309 *lenp = 3; 1310 return FILEID_INVALID; 1311 } 1312 1313 *lenp = 3; 1314 fid->udf.block = location.logicalBlockNum; 1315 fid->udf.partref = location.partitionReferenceNum; 1316 fid->udf.parent_partref = 0; 1317 fid->udf.generation = inode->i_generation; 1318 1319 if (parent) { 1320 location = UDF_I(parent)->i_location; 1321 fid->udf.parent_block = location.logicalBlockNum; 1322 fid->udf.parent_partref = location.partitionReferenceNum; 1323 fid->udf.parent_generation = inode->i_generation; 1324 *lenp = 5; 1325 type = FILEID_UDF_WITH_PARENT; 1326 } 1327 1328 return type; 1329 } 1330 1331 const struct export_operations udf_export_ops = { 1332 .encode_fh = udf_encode_fh, 1333 .fh_to_dentry = udf_fh_to_dentry, 1334 .fh_to_parent = udf_fh_to_parent, 1335 .get_parent = udf_get_parent, 1336 }; 1337 1338 const struct inode_operations udf_dir_inode_operations = { 1339 .lookup = udf_lookup, 1340 .create = udf_create, 1341 .link = udf_link, 1342 .unlink = udf_unlink, 1343 .symlink = udf_symlink, 1344 .mkdir = udf_mkdir, 1345 .rmdir = udf_rmdir, 1346 .mknod = udf_mknod, 1347 .rename = udf_rename, 1348 .tmpfile = udf_tmpfile, 1349 }; 1350