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/quotaops.h> 31 #include <linux/smp_lock.h> 32 #include <linux/buffer_head.h> 33 #include <linux/sched.h> 34 #include <linux/crc-itu-t.h> 35 #include <linux/exportfs.h> 36 37 static inline int udf_match(int len1, const char *name1, int len2, 38 const char *name2) 39 { 40 if (len1 != len2) 41 return 0; 42 43 return !memcmp(name1, name2, len1); 44 } 45 46 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, 47 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, 48 uint8_t *impuse, uint8_t *fileident) 49 { 50 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag); 51 uint16_t crc; 52 int offset; 53 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); 54 uint8_t lfi = cfi->lengthFileIdent; 55 int padlen = fibh->eoffset - fibh->soffset - liu - lfi - 56 sizeof(struct fileIdentDesc); 57 int adinicb = 0; 58 59 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 60 adinicb = 1; 61 62 offset = fibh->soffset + sizeof(struct fileIdentDesc); 63 64 if (impuse) { 65 if (adinicb || (offset + liu < 0)) { 66 memcpy((uint8_t *)sfi->impUse, impuse, liu); 67 } else if (offset >= 0) { 68 memcpy(fibh->ebh->b_data + offset, impuse, liu); 69 } else { 70 memcpy((uint8_t *)sfi->impUse, impuse, -offset); 71 memcpy(fibh->ebh->b_data, impuse - offset, 72 liu + offset); 73 } 74 } 75 76 offset += liu; 77 78 if (fileident) { 79 if (adinicb || (offset + lfi < 0)) { 80 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi); 81 } else if (offset >= 0) { 82 memcpy(fibh->ebh->b_data + offset, fileident, lfi); 83 } else { 84 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, 85 -offset); 86 memcpy(fibh->ebh->b_data, fileident - offset, 87 lfi + offset); 88 } 89 } 90 91 offset += lfi; 92 93 if (adinicb || (offset + padlen < 0)) { 94 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); 95 } else if (offset >= 0) { 96 memset(fibh->ebh->b_data + offset, 0x00, padlen); 97 } else { 98 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset); 99 memset(fibh->ebh->b_data, 0x00, padlen + offset); 100 } 101 102 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(tag), 103 sizeof(struct fileIdentDesc) - sizeof(tag)); 104 105 if (fibh->sbh == fibh->ebh) { 106 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 107 crclen + sizeof(tag) - 108 sizeof(struct fileIdentDesc)); 109 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { 110 crc = crc_itu_t(crc, fibh->ebh->b_data + 111 sizeof(struct fileIdentDesc) + 112 fibh->soffset, 113 crclen + sizeof(tag) - 114 sizeof(struct fileIdentDesc)); 115 } else { 116 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 117 -fibh->soffset - sizeof(struct fileIdentDesc)); 118 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); 119 } 120 121 cfi->descTag.descCRC = cpu_to_le16(crc); 122 cfi->descTag.descCRCLength = cpu_to_le16(crclen); 123 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); 124 125 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { 126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, 127 sizeof(struct fileIdentDesc)); 128 } else { 129 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); 130 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, 131 sizeof(struct fileIdentDesc) + fibh->soffset); 132 } 133 134 if (adinicb) { 135 mark_inode_dirty(inode); 136 } else { 137 if (fibh->sbh != fibh->ebh) 138 mark_buffer_dirty_inode(fibh->ebh, inode); 139 mark_buffer_dirty_inode(fibh->sbh, inode); 140 } 141 return 0; 142 } 143 144 static struct fileIdentDesc *udf_find_entry(struct inode *dir, 145 struct dentry *dentry, 146 struct udf_fileident_bh *fibh, 147 struct fileIdentDesc *cfi) 148 { 149 struct fileIdentDesc *fi = NULL; 150 loff_t f_pos; 151 int block, flen; 152 char *fname = NULL; 153 char *nameptr; 154 uint8_t lfi; 155 uint16_t liu; 156 loff_t size; 157 kernel_lb_addr eloc; 158 uint32_t elen; 159 sector_t offset; 160 struct extent_position epos = {}; 161 struct udf_inode_info *dinfo = UDF_I(dir); 162 int isdotdot = dentry->d_name.len == 2 && 163 dentry->d_name.name[0] == '.' && dentry->d_name.name[1] == '.'; 164 165 size = udf_ext0_offset(dir) + dir->i_size; 166 f_pos = udf_ext0_offset(dir); 167 168 fibh->sbh = fibh->ebh = NULL; 169 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 170 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 171 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 172 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) 173 goto out_err; 174 block = udf_get_lb_pblock(dir->i_sb, eloc, offset); 175 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 176 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 177 epos.offset -= sizeof(short_ad); 178 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 179 epos.offset -= sizeof(long_ad); 180 } else 181 offset = 0; 182 183 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 184 if (!fibh->sbh) 185 goto out_err; 186 } 187 188 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 189 if (!fname) 190 goto out_err; 191 192 while (f_pos < size) { 193 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 194 &elen, &offset); 195 if (!fi) 196 goto out_err; 197 198 liu = le16_to_cpu(cfi->lengthOfImpUse); 199 lfi = cfi->lengthFileIdent; 200 201 if (fibh->sbh == fibh->ebh) { 202 nameptr = fi->fileIdent + liu; 203 } else { 204 int poffset; /* Unpaded ending offset */ 205 206 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + 207 liu + lfi; 208 209 if (poffset >= lfi) 210 nameptr = (uint8_t *)(fibh->ebh->b_data + 211 poffset - lfi); 212 else { 213 nameptr = fname; 214 memcpy(nameptr, fi->fileIdent + liu, 215 lfi - poffset); 216 memcpy(nameptr + lfi - poffset, 217 fibh->ebh->b_data, poffset); 218 } 219 } 220 221 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 222 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE)) 223 continue; 224 } 225 226 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { 227 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE)) 228 continue; 229 } 230 231 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && 232 isdotdot) { 233 brelse(epos.bh); 234 return fi; 235 } 236 237 if (!lfi) 238 continue; 239 240 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi); 241 if (flen && udf_match(flen, fname, dentry->d_name.len, 242 dentry->d_name.name)) 243 goto out_ok; 244 } 245 246 out_err: 247 fi = NULL; 248 if (fibh->sbh != fibh->ebh) 249 brelse(fibh->ebh); 250 brelse(fibh->sbh); 251 out_ok: 252 brelse(epos.bh); 253 kfree(fname); 254 255 return fi; 256 } 257 258 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 259 struct nameidata *nd) 260 { 261 struct inode *inode = NULL; 262 struct fileIdentDesc cfi; 263 struct udf_fileident_bh fibh; 264 265 if (dentry->d_name.len > UDF_NAME_LEN - 2) 266 return ERR_PTR(-ENAMETOOLONG); 267 268 lock_kernel(); 269 #ifdef UDF_RECOVERY 270 /* temporary shorthand for specifying files by inode number */ 271 if (!strncmp(dentry->d_name.name, ".B=", 3)) { 272 kernel_lb_addr lb = { 273 .logicalBlockNum = 0, 274 .partitionReferenceNum = 275 simple_strtoul(dentry->d_name.name + 3, 276 NULL, 0), 277 }; 278 inode = udf_iget(dir->i_sb, lb); 279 if (!inode) { 280 unlock_kernel(); 281 return ERR_PTR(-EACCES); 282 } 283 } else 284 #endif /* UDF_RECOVERY */ 285 286 if (udf_find_entry(dir, dentry, &fibh, &cfi)) { 287 if (fibh.sbh != fibh.ebh) 288 brelse(fibh.ebh); 289 brelse(fibh.sbh); 290 291 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation)); 292 if (!inode) { 293 unlock_kernel(); 294 return ERR_PTR(-EACCES); 295 } 296 } 297 unlock_kernel(); 298 299 return d_splice_alias(inode, dentry); 300 } 301 302 static struct fileIdentDesc *udf_add_entry(struct inode *dir, 303 struct dentry *dentry, 304 struct udf_fileident_bh *fibh, 305 struct fileIdentDesc *cfi, int *err) 306 { 307 struct super_block *sb = dir->i_sb; 308 struct fileIdentDesc *fi = NULL; 309 char *name = NULL; 310 int namelen; 311 loff_t f_pos; 312 loff_t size = udf_ext0_offset(dir) + dir->i_size; 313 int nfidlen; 314 uint8_t lfi; 315 uint16_t liu; 316 int block; 317 kernel_lb_addr eloc; 318 uint32_t elen = 0; 319 sector_t offset; 320 struct extent_position epos = {}; 321 struct udf_inode_info *dinfo; 322 323 fibh->sbh = fibh->ebh = NULL; 324 name = kmalloc(UDF_NAME_LEN, GFP_NOFS); 325 if (!name) { 326 *err = -ENOMEM; 327 goto out_err; 328 } 329 330 if (dentry) { 331 if (!dentry->d_name.len) { 332 *err = -EINVAL; 333 goto out_err; 334 } 335 namelen = udf_put_filename(sb, dentry->d_name.name, name, 336 dentry->d_name.len); 337 if (!namelen) { 338 *err = -ENAMETOOLONG; 339 goto out_err; 340 } 341 } else { 342 namelen = 0; 343 } 344 345 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; 346 347 f_pos = udf_ext0_offset(dir); 348 349 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 350 dinfo = UDF_I(dir); 351 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 352 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 353 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 354 block = udf_get_lb_pblock(dir->i_sb, 355 dinfo->i_location, 0); 356 fibh->soffset = fibh->eoffset = sb->s_blocksize; 357 goto add; 358 } 359 block = udf_get_lb_pblock(dir->i_sb, eloc, offset); 360 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 361 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 362 epos.offset -= sizeof(short_ad); 363 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 364 epos.offset -= sizeof(long_ad); 365 } else 366 offset = 0; 367 368 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 369 if (!fibh->sbh) { 370 *err = -EIO; 371 goto out_err; 372 } 373 374 block = dinfo->i_location.logicalBlockNum; 375 } 376 377 while (f_pos < size) { 378 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 379 &elen, &offset); 380 381 if (!fi) { 382 *err = -EIO; 383 goto out_err; 384 } 385 386 liu = le16_to_cpu(cfi->lengthOfImpUse); 387 lfi = cfi->lengthFileIdent; 388 389 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 390 if (((sizeof(struct fileIdentDesc) + 391 liu + lfi + 3) & ~3) == nfidlen) { 392 cfi->descTag.tagSerialNum = cpu_to_le16(1); 393 cfi->fileVersionNum = cpu_to_le16(1); 394 cfi->fileCharacteristics = 0; 395 cfi->lengthFileIdent = namelen; 396 cfi->lengthOfImpUse = cpu_to_le16(0); 397 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 398 name)) 399 goto out_ok; 400 else { 401 *err = -EIO; 402 goto out_err; 403 } 404 } 405 } 406 } 407 408 add: 409 /* Is there any extent whose size we need to round up? */ 410 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) { 411 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 412 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 413 epos.offset -= sizeof(short_ad); 414 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 415 epos.offset -= sizeof(long_ad); 416 udf_write_aext(dir, &epos, eloc, elen, 1); 417 } 418 f_pos += nfidlen; 419 420 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 421 sb->s_blocksize - fibh->eoffset < nfidlen) { 422 brelse(epos.bh); 423 epos.bh = NULL; 424 fibh->soffset -= udf_ext0_offset(dir); 425 fibh->eoffset -= udf_ext0_offset(dir); 426 f_pos -= udf_ext0_offset(dir); 427 if (fibh->sbh != fibh->ebh) 428 brelse(fibh->ebh); 429 brelse(fibh->sbh); 430 fibh->sbh = fibh->ebh = 431 udf_expand_dir_adinicb(dir, &block, err); 432 if (!fibh->sbh) 433 goto out_err; 434 epos.block = dinfo->i_location; 435 epos.offset = udf_file_entry_alloc_offset(dir); 436 /* Load extent udf_expand_dir_adinicb() has created */ 437 udf_current_aext(dir, &epos, &eloc, &elen, 1); 438 } 439 440 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 441 fibh->soffset = fibh->eoffset; 442 fibh->eoffset += nfidlen; 443 if (fibh->sbh != fibh->ebh) { 444 brelse(fibh->sbh); 445 fibh->sbh = fibh->ebh; 446 } 447 448 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 449 block = dinfo->i_location.logicalBlockNum; 450 fi = (struct fileIdentDesc *) 451 (dinfo->i_ext.i_data + 452 fibh->soffset - 453 udf_ext0_offset(dir) + 454 dinfo->i_lenEAttr); 455 } else { 456 block = eloc.logicalBlockNum + 457 ((elen - 1) >> 458 dir->i_sb->s_blocksize_bits); 459 fi = (struct fileIdentDesc *) 460 (fibh->sbh->b_data + fibh->soffset); 461 } 462 } else { 463 fibh->soffset = fibh->eoffset - sb->s_blocksize; 464 fibh->eoffset += nfidlen - sb->s_blocksize; 465 if (fibh->sbh != fibh->ebh) { 466 brelse(fibh->sbh); 467 fibh->sbh = fibh->ebh; 468 } 469 470 block = eloc.logicalBlockNum + ((elen - 1) >> 471 dir->i_sb->s_blocksize_bits); 472 fibh->ebh = udf_bread(dir, 473 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 474 if (!fibh->ebh) 475 goto out_err; 476 477 if (!fibh->soffset) { 478 if (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 479 (EXT_RECORDED_ALLOCATED >> 30)) { 480 block = eloc.logicalBlockNum + ((elen - 1) >> 481 dir->i_sb->s_blocksize_bits); 482 } else 483 block++; 484 485 brelse(fibh->sbh); 486 fibh->sbh = fibh->ebh; 487 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 488 } else { 489 fi = (struct fileIdentDesc *) 490 (fibh->sbh->b_data + sb->s_blocksize + 491 fibh->soffset); 492 } 493 } 494 495 memset(cfi, 0, sizeof(struct fileIdentDesc)); 496 if (UDF_SB(sb)->s_udfrev >= 0x0200) 497 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 498 sizeof(tag)); 499 else 500 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 501 sizeof(tag)); 502 cfi->fileVersionNum = cpu_to_le16(1); 503 cfi->lengthFileIdent = namelen; 504 cfi->lengthOfImpUse = cpu_to_le16(0); 505 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 506 dir->i_size += nfidlen; 507 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 508 dinfo->i_lenAlloc += nfidlen; 509 mark_inode_dirty(dir); 510 goto out_ok; 511 } else { 512 *err = -EIO; 513 goto out_err; 514 } 515 516 out_err: 517 fi = NULL; 518 if (fibh->sbh != fibh->ebh) 519 brelse(fibh->ebh); 520 brelse(fibh->sbh); 521 out_ok: 522 brelse(epos.bh); 523 kfree(name); 524 return fi; 525 } 526 527 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 528 struct udf_fileident_bh *fibh, 529 struct fileIdentDesc *cfi) 530 { 531 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 532 533 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 534 memset(&(cfi->icb), 0x00, sizeof(long_ad)); 535 536 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 537 } 538 539 static int udf_create(struct inode *dir, struct dentry *dentry, int mode, 540 struct nameidata *nd) 541 { 542 struct udf_fileident_bh fibh; 543 struct inode *inode; 544 struct fileIdentDesc cfi, *fi; 545 int err; 546 struct udf_inode_info *iinfo; 547 548 lock_kernel(); 549 inode = udf_new_inode(dir, mode, &err); 550 if (!inode) { 551 unlock_kernel(); 552 return err; 553 } 554 555 iinfo = UDF_I(inode); 556 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 557 inode->i_data.a_ops = &udf_adinicb_aops; 558 else 559 inode->i_data.a_ops = &udf_aops; 560 inode->i_op = &udf_file_inode_operations; 561 inode->i_fop = &udf_file_operations; 562 inode->i_mode = mode; 563 mark_inode_dirty(inode); 564 565 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 566 if (!fi) { 567 inode->i_nlink--; 568 mark_inode_dirty(inode); 569 iput(inode); 570 unlock_kernel(); 571 return err; 572 } 573 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 574 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 575 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 576 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 577 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 578 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 579 mark_inode_dirty(dir); 580 if (fibh.sbh != fibh.ebh) 581 brelse(fibh.ebh); 582 brelse(fibh.sbh); 583 unlock_kernel(); 584 d_instantiate(dentry, inode); 585 586 return 0; 587 } 588 589 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode, 590 dev_t rdev) 591 { 592 struct inode *inode; 593 struct udf_fileident_bh fibh; 594 struct fileIdentDesc cfi, *fi; 595 int err; 596 struct udf_inode_info *iinfo; 597 598 if (!old_valid_dev(rdev)) 599 return -EINVAL; 600 601 lock_kernel(); 602 err = -EIO; 603 inode = udf_new_inode(dir, mode, &err); 604 if (!inode) 605 goto out; 606 607 iinfo = UDF_I(inode); 608 inode->i_uid = current->fsuid; 609 init_special_inode(inode, mode, rdev); 610 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 611 if (!fi) { 612 inode->i_nlink--; 613 mark_inode_dirty(inode); 614 iput(inode); 615 unlock_kernel(); 616 return err; 617 } 618 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 619 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 620 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 621 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 622 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 623 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 624 mark_inode_dirty(dir); 625 mark_inode_dirty(inode); 626 627 if (fibh.sbh != fibh.ebh) 628 brelse(fibh.ebh); 629 brelse(fibh.sbh); 630 d_instantiate(dentry, inode); 631 err = 0; 632 633 out: 634 unlock_kernel(); 635 return err; 636 } 637 638 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode) 639 { 640 struct inode *inode; 641 struct udf_fileident_bh fibh; 642 struct fileIdentDesc cfi, *fi; 643 int err; 644 struct udf_inode_info *dinfo = UDF_I(dir); 645 struct udf_inode_info *iinfo; 646 647 lock_kernel(); 648 err = -EMLINK; 649 if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1) 650 goto out; 651 652 err = -EIO; 653 inode = udf_new_inode(dir, S_IFDIR, &err); 654 if (!inode) 655 goto out; 656 657 iinfo = UDF_I(inode); 658 inode->i_op = &udf_dir_inode_operations; 659 inode->i_fop = &udf_dir_operations; 660 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 661 if (!fi) { 662 inode->i_nlink--; 663 mark_inode_dirty(inode); 664 iput(inode); 665 goto out; 666 } 667 inode->i_nlink = 2; 668 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 669 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 670 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 671 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 672 cfi.fileCharacteristics = 673 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 674 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 675 brelse(fibh.sbh); 676 inode->i_mode = S_IFDIR | mode; 677 if (dir->i_mode & S_ISGID) 678 inode->i_mode |= S_ISGID; 679 mark_inode_dirty(inode); 680 681 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 682 if (!fi) { 683 inode->i_nlink = 0; 684 mark_inode_dirty(inode); 685 iput(inode); 686 goto out; 687 } 688 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 689 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 690 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 691 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 692 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 693 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 694 inc_nlink(dir); 695 mark_inode_dirty(dir); 696 d_instantiate(dentry, inode); 697 if (fibh.sbh != fibh.ebh) 698 brelse(fibh.ebh); 699 brelse(fibh.sbh); 700 err = 0; 701 702 out: 703 unlock_kernel(); 704 return err; 705 } 706 707 static int empty_dir(struct inode *dir) 708 { 709 struct fileIdentDesc *fi, cfi; 710 struct udf_fileident_bh fibh; 711 loff_t f_pos; 712 loff_t size = udf_ext0_offset(dir) + dir->i_size; 713 int block; 714 kernel_lb_addr eloc; 715 uint32_t elen; 716 sector_t offset; 717 struct extent_position epos = {}; 718 struct udf_inode_info *dinfo = UDF_I(dir); 719 720 f_pos = udf_ext0_offset(dir); 721 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 722 723 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 724 fibh.sbh = fibh.ebh = NULL; 725 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 726 &epos, &eloc, &elen, &offset) == 727 (EXT_RECORDED_ALLOCATED >> 30)) { 728 block = udf_get_lb_pblock(dir->i_sb, eloc, offset); 729 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 730 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 731 epos.offset -= sizeof(short_ad); 732 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 733 epos.offset -= sizeof(long_ad); 734 } else 735 offset = 0; 736 737 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 738 if (!fibh.sbh) { 739 brelse(epos.bh); 740 return 0; 741 } 742 } else { 743 brelse(epos.bh); 744 return 0; 745 } 746 747 while (f_pos < size) { 748 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 749 &elen, &offset); 750 if (!fi) { 751 if (fibh.sbh != fibh.ebh) 752 brelse(fibh.ebh); 753 brelse(fibh.sbh); 754 brelse(epos.bh); 755 return 0; 756 } 757 758 if (cfi.lengthFileIdent && 759 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 760 if (fibh.sbh != fibh.ebh) 761 brelse(fibh.ebh); 762 brelse(fibh.sbh); 763 brelse(epos.bh); 764 return 0; 765 } 766 } 767 768 if (fibh.sbh != fibh.ebh) 769 brelse(fibh.ebh); 770 brelse(fibh.sbh); 771 brelse(epos.bh); 772 773 return 1; 774 } 775 776 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 777 { 778 int retval; 779 struct inode *inode = dentry->d_inode; 780 struct udf_fileident_bh fibh; 781 struct fileIdentDesc *fi, cfi; 782 kernel_lb_addr tloc; 783 784 retval = -ENOENT; 785 lock_kernel(); 786 fi = udf_find_entry(dir, dentry, &fibh, &cfi); 787 if (!fi) 788 goto out; 789 790 retval = -EIO; 791 tloc = lelb_to_cpu(cfi.icb.extLocation); 792 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino) 793 goto end_rmdir; 794 retval = -ENOTEMPTY; 795 if (!empty_dir(inode)) 796 goto end_rmdir; 797 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 798 if (retval) 799 goto end_rmdir; 800 if (inode->i_nlink != 2) 801 udf_warning(inode->i_sb, "udf_rmdir", 802 "empty directory has nlink != 2 (%d)", 803 inode->i_nlink); 804 clear_nlink(inode); 805 inode->i_size = 0; 806 inode_dec_link_count(dir); 807 inode->i_ctime = dir->i_ctime = dir->i_mtime = 808 current_fs_time(dir->i_sb); 809 mark_inode_dirty(dir); 810 811 end_rmdir: 812 if (fibh.sbh != fibh.ebh) 813 brelse(fibh.ebh); 814 brelse(fibh.sbh); 815 816 out: 817 unlock_kernel(); 818 return retval; 819 } 820 821 static int udf_unlink(struct inode *dir, struct dentry *dentry) 822 { 823 int retval; 824 struct inode *inode = dentry->d_inode; 825 struct udf_fileident_bh fibh; 826 struct fileIdentDesc *fi; 827 struct fileIdentDesc cfi; 828 kernel_lb_addr tloc; 829 830 retval = -ENOENT; 831 lock_kernel(); 832 fi = udf_find_entry(dir, dentry, &fibh, &cfi); 833 if (!fi) 834 goto out; 835 836 retval = -EIO; 837 tloc = lelb_to_cpu(cfi.icb.extLocation); 838 if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino) 839 goto end_unlink; 840 841 if (!inode->i_nlink) { 842 udf_debug("Deleting nonexistent file (%lu), %d\n", 843 inode->i_ino, inode->i_nlink); 844 inode->i_nlink = 1; 845 } 846 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 847 if (retval) 848 goto end_unlink; 849 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); 850 mark_inode_dirty(dir); 851 inode_dec_link_count(inode); 852 inode->i_ctime = dir->i_ctime; 853 retval = 0; 854 855 end_unlink: 856 if (fibh.sbh != fibh.ebh) 857 brelse(fibh.ebh); 858 brelse(fibh.sbh); 859 860 out: 861 unlock_kernel(); 862 return retval; 863 } 864 865 static int udf_symlink(struct inode *dir, struct dentry *dentry, 866 const char *symname) 867 { 868 struct inode *inode; 869 struct pathComponent *pc; 870 char *compstart; 871 struct udf_fileident_bh fibh; 872 struct extent_position epos = {}; 873 int eoffset, elen = 0; 874 struct fileIdentDesc *fi; 875 struct fileIdentDesc cfi; 876 char *ea; 877 int err; 878 int block; 879 char *name = NULL; 880 int namelen; 881 struct buffer_head *bh; 882 struct udf_inode_info *iinfo; 883 884 lock_kernel(); 885 inode = udf_new_inode(dir, S_IFLNK, &err); 886 if (!inode) 887 goto out; 888 889 name = kmalloc(UDF_NAME_LEN, GFP_NOFS); 890 if (!name) { 891 err = -ENOMEM; 892 goto out_no_entry; 893 } 894 895 iinfo = UDF_I(inode); 896 inode->i_mode = S_IFLNK | S_IRWXUGO; 897 inode->i_data.a_ops = &udf_symlink_aops; 898 inode->i_op = &page_symlink_inode_operations; 899 900 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 901 kernel_lb_addr eloc; 902 uint32_t bsize; 903 904 block = udf_new_block(inode->i_sb, inode, 905 iinfo->i_location.partitionReferenceNum, 906 iinfo->i_location.logicalBlockNum, &err); 907 if (!block) 908 goto out_no_entry; 909 epos.block = iinfo->i_location; 910 epos.offset = udf_file_entry_alloc_offset(inode); 911 epos.bh = NULL; 912 eloc.logicalBlockNum = block; 913 eloc.partitionReferenceNum = 914 iinfo->i_location.partitionReferenceNum; 915 bsize = inode->i_sb->s_blocksize; 916 iinfo->i_lenExtents = bsize; 917 udf_add_aext(inode, &epos, eloc, bsize, 0); 918 brelse(epos.bh); 919 920 block = udf_get_pblock(inode->i_sb, block, 921 iinfo->i_location.partitionReferenceNum, 922 0); 923 epos.bh = udf_tread(inode->i_sb, block); 924 lock_buffer(epos.bh); 925 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize); 926 set_buffer_uptodate(epos.bh); 927 unlock_buffer(epos.bh); 928 mark_buffer_dirty_inode(epos.bh, inode); 929 ea = epos.bh->b_data + udf_ext0_offset(inode); 930 } else 931 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; 932 933 eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode); 934 pc = (struct pathComponent *)ea; 935 936 if (*symname == '/') { 937 do { 938 symname++; 939 } while (*symname == '/'); 940 941 pc->componentType = 1; 942 pc->lengthComponentIdent = 0; 943 pc->componentFileVersionNum = 0; 944 pc += sizeof(struct pathComponent); 945 elen += sizeof(struct pathComponent); 946 } 947 948 err = -ENAMETOOLONG; 949 950 while (*symname) { 951 if (elen + sizeof(struct pathComponent) > eoffset) 952 goto out_no_entry; 953 954 pc = (struct pathComponent *)(ea + elen); 955 956 compstart = (char *)symname; 957 958 do { 959 symname++; 960 } while (*symname && *symname != '/'); 961 962 pc->componentType = 5; 963 pc->lengthComponentIdent = 0; 964 pc->componentFileVersionNum = 0; 965 if (compstart[0] == '.') { 966 if ((symname - compstart) == 1) 967 pc->componentType = 4; 968 else if ((symname - compstart) == 2 && 969 compstart[1] == '.') 970 pc->componentType = 3; 971 } 972 973 if (pc->componentType == 5) { 974 namelen = udf_put_filename(inode->i_sb, compstart, name, 975 symname - compstart); 976 if (!namelen) 977 goto out_no_entry; 978 979 if (elen + sizeof(struct pathComponent) + namelen > 980 eoffset) 981 goto out_no_entry; 982 else 983 pc->lengthComponentIdent = namelen; 984 985 memcpy(pc->componentIdent, name, namelen); 986 } 987 988 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 989 990 if (*symname) { 991 do { 992 symname++; 993 } while (*symname == '/'); 994 } 995 } 996 997 brelse(epos.bh); 998 inode->i_size = elen; 999 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1000 iinfo->i_lenAlloc = inode->i_size; 1001 mark_inode_dirty(inode); 1002 1003 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1004 if (!fi) 1005 goto out_no_entry; 1006 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1007 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 1008 bh = UDF_SB(inode->i_sb)->s_lvid_bh; 1009 if (bh) { 1010 struct logicalVolIntegrityDesc *lvid = 1011 (struct logicalVolIntegrityDesc *)bh->b_data; 1012 struct logicalVolHeaderDesc *lvhd; 1013 uint64_t uniqueID; 1014 lvhd = (struct logicalVolHeaderDesc *) 1015 lvid->logicalVolContentsUse; 1016 uniqueID = le64_to_cpu(lvhd->uniqueID); 1017 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1018 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); 1019 if (!(++uniqueID & 0x00000000FFFFFFFFUL)) 1020 uniqueID += 16; 1021 lvhd->uniqueID = cpu_to_le64(uniqueID); 1022 mark_buffer_dirty(bh); 1023 } 1024 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1025 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1026 mark_inode_dirty(dir); 1027 if (fibh.sbh != fibh.ebh) 1028 brelse(fibh.ebh); 1029 brelse(fibh.sbh); 1030 d_instantiate(dentry, inode); 1031 err = 0; 1032 1033 out: 1034 kfree(name); 1035 unlock_kernel(); 1036 return err; 1037 1038 out_no_entry: 1039 inode_dec_link_count(inode); 1040 iput(inode); 1041 goto out; 1042 } 1043 1044 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1045 struct dentry *dentry) 1046 { 1047 struct inode *inode = old_dentry->d_inode; 1048 struct udf_fileident_bh fibh; 1049 struct fileIdentDesc cfi, *fi; 1050 int err; 1051 struct buffer_head *bh; 1052 1053 lock_kernel(); 1054 if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) { 1055 unlock_kernel(); 1056 return -EMLINK; 1057 } 1058 1059 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1060 if (!fi) { 1061 unlock_kernel(); 1062 return err; 1063 } 1064 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1065 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1066 bh = UDF_SB(inode->i_sb)->s_lvid_bh; 1067 if (bh) { 1068 struct logicalVolIntegrityDesc *lvid = 1069 (struct logicalVolIntegrityDesc *)bh->b_data; 1070 struct logicalVolHeaderDesc *lvhd; 1071 uint64_t uniqueID; 1072 lvhd = (struct logicalVolHeaderDesc *) 1073 (lvid->logicalVolContentsUse); 1074 uniqueID = le64_to_cpu(lvhd->uniqueID); 1075 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1076 cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL); 1077 if (!(++uniqueID & 0x00000000FFFFFFFFUL)) 1078 uniqueID += 16; 1079 lvhd->uniqueID = cpu_to_le64(uniqueID); 1080 mark_buffer_dirty(bh); 1081 } 1082 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1083 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1084 mark_inode_dirty(dir); 1085 1086 if (fibh.sbh != fibh.ebh) 1087 brelse(fibh.ebh); 1088 brelse(fibh.sbh); 1089 inc_nlink(inode); 1090 inode->i_ctime = current_fs_time(inode->i_sb); 1091 mark_inode_dirty(inode); 1092 atomic_inc(&inode->i_count); 1093 d_instantiate(dentry, inode); 1094 unlock_kernel(); 1095 1096 return 0; 1097 } 1098 1099 /* Anybody can rename anything with this: the permission checks are left to the 1100 * higher-level routines. 1101 */ 1102 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 1103 struct inode *new_dir, struct dentry *new_dentry) 1104 { 1105 struct inode *old_inode = old_dentry->d_inode; 1106 struct inode *new_inode = new_dentry->d_inode; 1107 struct udf_fileident_bh ofibh, nfibh; 1108 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1109 struct fileIdentDesc ocfi, ncfi; 1110 struct buffer_head *dir_bh = NULL; 1111 int retval = -ENOENT; 1112 kernel_lb_addr tloc; 1113 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1114 1115 lock_kernel(); 1116 ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi); 1117 if (ofi) { 1118 if (ofibh.sbh != ofibh.ebh) 1119 brelse(ofibh.ebh); 1120 brelse(ofibh.sbh); 1121 } 1122 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1123 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0) 1124 != old_inode->i_ino) 1125 goto end_rename; 1126 1127 nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi); 1128 if (nfi) { 1129 if (!new_inode) { 1130 if (nfibh.sbh != nfibh.ebh) 1131 brelse(nfibh.ebh); 1132 brelse(nfibh.sbh); 1133 nfi = NULL; 1134 } 1135 } 1136 if (S_ISDIR(old_inode->i_mode)) { 1137 int offset = udf_ext0_offset(old_inode); 1138 1139 if (new_inode) { 1140 retval = -ENOTEMPTY; 1141 if (!empty_dir(new_inode)) 1142 goto end_rename; 1143 } 1144 retval = -EIO; 1145 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1146 dir_fi = udf_get_fileident( 1147 old_iinfo->i_ext.i_data - 1148 (old_iinfo->i_efe ? 1149 sizeof(struct extendedFileEntry) : 1150 sizeof(struct fileEntry)), 1151 old_inode->i_sb->s_blocksize, &offset); 1152 } else { 1153 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1154 if (!dir_bh) 1155 goto end_rename; 1156 dir_fi = udf_get_fileident(dir_bh->b_data, 1157 old_inode->i_sb->s_blocksize, &offset); 1158 } 1159 if (!dir_fi) 1160 goto end_rename; 1161 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1162 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) != 1163 old_dir->i_ino) 1164 goto end_rename; 1165 1166 retval = -EMLINK; 1167 if (!new_inode && 1168 new_dir->i_nlink >= 1169 (256 << sizeof(new_dir->i_nlink)) - 1) 1170 goto end_rename; 1171 } 1172 if (!nfi) { 1173 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1174 &retval); 1175 if (!nfi) 1176 goto end_rename; 1177 } 1178 1179 /* 1180 * Like most other Unix systems, set the ctime for inodes on a 1181 * rename. 1182 */ 1183 old_inode->i_ctime = current_fs_time(old_inode->i_sb); 1184 mark_inode_dirty(old_inode); 1185 1186 /* 1187 * ok, that's it 1188 */ 1189 ncfi.fileVersionNum = ocfi.fileVersionNum; 1190 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1191 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad)); 1192 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1193 1194 /* The old fid may have moved - find it again */ 1195 ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi); 1196 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1197 1198 if (new_inode) { 1199 new_inode->i_ctime = current_fs_time(new_inode->i_sb); 1200 inode_dec_link_count(new_inode); 1201 } 1202 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); 1203 mark_inode_dirty(old_dir); 1204 1205 if (dir_fi) { 1206 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1207 udf_update_tag((char *)dir_fi, 1208 (sizeof(struct fileIdentDesc) + 1209 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); 1210 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1211 mark_inode_dirty(old_inode); 1212 else 1213 mark_buffer_dirty_inode(dir_bh, old_inode); 1214 1215 inode_dec_link_count(old_dir); 1216 if (new_inode) 1217 inode_dec_link_count(new_inode); 1218 else { 1219 inc_nlink(new_dir); 1220 mark_inode_dirty(new_dir); 1221 } 1222 } 1223 1224 if (ofi) { 1225 if (ofibh.sbh != ofibh.ebh) 1226 brelse(ofibh.ebh); 1227 brelse(ofibh.sbh); 1228 } 1229 1230 retval = 0; 1231 1232 end_rename: 1233 brelse(dir_bh); 1234 if (nfi) { 1235 if (nfibh.sbh != nfibh.ebh) 1236 brelse(nfibh.ebh); 1237 brelse(nfibh.sbh); 1238 } 1239 unlock_kernel(); 1240 1241 return retval; 1242 } 1243 1244 static struct dentry *udf_get_parent(struct dentry *child) 1245 { 1246 struct dentry *parent; 1247 struct inode *inode = NULL; 1248 struct dentry dotdot; 1249 struct fileIdentDesc cfi; 1250 struct udf_fileident_bh fibh; 1251 1252 dotdot.d_name.name = ".."; 1253 dotdot.d_name.len = 2; 1254 1255 lock_kernel(); 1256 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi)) 1257 goto out_unlock; 1258 1259 if (fibh.sbh != fibh.ebh) 1260 brelse(fibh.ebh); 1261 brelse(fibh.sbh); 1262 1263 inode = udf_iget(child->d_inode->i_sb, 1264 lelb_to_cpu(cfi.icb.extLocation)); 1265 if (!inode) 1266 goto out_unlock; 1267 unlock_kernel(); 1268 1269 parent = d_alloc_anon(inode); 1270 if (!parent) { 1271 iput(inode); 1272 parent = ERR_PTR(-ENOMEM); 1273 } 1274 1275 return parent; 1276 out_unlock: 1277 unlock_kernel(); 1278 return ERR_PTR(-EACCES); 1279 } 1280 1281 1282 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1283 u16 partref, __u32 generation) 1284 { 1285 struct inode *inode; 1286 struct dentry *result; 1287 kernel_lb_addr loc; 1288 1289 if (block == 0) 1290 return ERR_PTR(-ESTALE); 1291 1292 loc.logicalBlockNum = block; 1293 loc.partitionReferenceNum = partref; 1294 inode = udf_iget(sb, loc); 1295 1296 if (inode == NULL) 1297 return ERR_PTR(-ENOMEM); 1298 1299 if (generation && inode->i_generation != generation) { 1300 iput(inode); 1301 return ERR_PTR(-ESTALE); 1302 } 1303 result = d_alloc_anon(inode); 1304 if (!result) { 1305 iput(inode); 1306 return ERR_PTR(-ENOMEM); 1307 } 1308 return result; 1309 } 1310 1311 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1312 struct fid *fid, int fh_len, int fh_type) 1313 { 1314 if ((fh_len != 3 && fh_len != 5) || 1315 (fh_type != FILEID_UDF_WITH_PARENT && 1316 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1317 return NULL; 1318 1319 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1320 fid->udf.generation); 1321 } 1322 1323 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1324 struct fid *fid, int fh_len, int fh_type) 1325 { 1326 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT) 1327 return NULL; 1328 1329 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1330 fid->udf.parent_partref, 1331 fid->udf.parent_generation); 1332 } 1333 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp, 1334 int connectable) 1335 { 1336 int len = *lenp; 1337 struct inode *inode = de->d_inode; 1338 kernel_lb_addr location = UDF_I(inode)->i_location; 1339 struct fid *fid = (struct fid *)fh; 1340 int type = FILEID_UDF_WITHOUT_PARENT; 1341 1342 if (len < 3 || (connectable && len < 5)) 1343 return 255; 1344 1345 *lenp = 3; 1346 fid->udf.block = location.logicalBlockNum; 1347 fid->udf.partref = location.partitionReferenceNum; 1348 fid->udf.generation = inode->i_generation; 1349 1350 if (connectable && !S_ISDIR(inode->i_mode)) { 1351 spin_lock(&de->d_lock); 1352 inode = de->d_parent->d_inode; 1353 location = UDF_I(inode)->i_location; 1354 fid->udf.parent_block = location.logicalBlockNum; 1355 fid->udf.parent_partref = location.partitionReferenceNum; 1356 fid->udf.parent_generation = inode->i_generation; 1357 spin_unlock(&de->d_lock); 1358 *lenp = 5; 1359 type = FILEID_UDF_WITH_PARENT; 1360 } 1361 1362 return type; 1363 } 1364 1365 const struct export_operations udf_export_ops = { 1366 .encode_fh = udf_encode_fh, 1367 .fh_to_dentry = udf_fh_to_dentry, 1368 .fh_to_parent = udf_fh_to_parent, 1369 .get_parent = udf_get_parent, 1370 }; 1371 1372 const struct inode_operations udf_dir_inode_operations = { 1373 .lookup = udf_lookup, 1374 .create = udf_create, 1375 .link = udf_link, 1376 .unlink = udf_unlink, 1377 .symlink = udf_symlink, 1378 .mkdir = udf_mkdir, 1379 .rmdir = udf_rmdir, 1380 .mknod = udf_mknod, 1381 .rename = udf_rename, 1382 }; 1383