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