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 enum { UDF_MAX_LINKS = 0xffff }; 36 37 static inline int udf_match(int len1, const unsigned char *name1, int len2, 38 const unsigned 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(struct 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(struct tag), 103 sizeof(struct fileIdentDesc) - sizeof(struct tag)); 104 105 if (fibh->sbh == fibh->ebh) { 106 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 107 crclen + sizeof(struct 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(struct 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 const struct qstr *child, 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 unsigned char *fname = NULL; 153 unsigned char *nameptr; 154 uint8_t lfi; 155 uint16_t liu; 156 loff_t size; 157 struct 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 = child->len == 2 && 163 child->name[0] == '.' && child->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(struct short_ad); 178 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 179 epos.offset -= sizeof(struct 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 goto out_ok; 234 235 if (!lfi) 236 continue; 237 238 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi); 239 if (flen && udf_match(flen, fname, child->len, child->name)) 240 goto out_ok; 241 } 242 243 out_err: 244 fi = NULL; 245 if (fibh->sbh != fibh->ebh) 246 brelse(fibh->ebh); 247 brelse(fibh->sbh); 248 out_ok: 249 brelse(epos.bh); 250 kfree(fname); 251 252 return fi; 253 } 254 255 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 256 struct nameidata *nd) 257 { 258 struct inode *inode = NULL; 259 struct fileIdentDesc cfi; 260 struct udf_fileident_bh fibh; 261 262 if (dentry->d_name.len > UDF_NAME_LEN - 2) 263 return ERR_PTR(-ENAMETOOLONG); 264 265 #ifdef UDF_RECOVERY 266 /* temporary shorthand for specifying files by inode number */ 267 if (!strncmp(dentry->d_name.name, ".B=", 3)) { 268 struct kernel_lb_addr lb = { 269 .logicalBlockNum = 0, 270 .partitionReferenceNum = 271 simple_strtoul(dentry->d_name.name + 3, 272 NULL, 0), 273 }; 274 inode = udf_iget(dir->i_sb, lb); 275 if (!inode) { 276 return ERR_PTR(-EACCES); 277 } 278 } else 279 #endif /* UDF_RECOVERY */ 280 281 if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) { 282 struct kernel_lb_addr loc; 283 284 if (fibh.sbh != fibh.ebh) 285 brelse(fibh.ebh); 286 brelse(fibh.sbh); 287 288 loc = lelb_to_cpu(cfi.icb.extLocation); 289 inode = udf_iget(dir->i_sb, &loc); 290 if (!inode) { 291 return ERR_PTR(-EACCES); 292 } 293 } 294 295 return d_splice_alias(inode, dentry); 296 } 297 298 static struct fileIdentDesc *udf_add_entry(struct inode *dir, 299 struct dentry *dentry, 300 struct udf_fileident_bh *fibh, 301 struct fileIdentDesc *cfi, int *err) 302 { 303 struct super_block *sb = dir->i_sb; 304 struct fileIdentDesc *fi = NULL; 305 unsigned char *name = NULL; 306 int namelen; 307 loff_t f_pos; 308 loff_t size = udf_ext0_offset(dir) + dir->i_size; 309 int nfidlen; 310 uint8_t lfi; 311 uint16_t liu; 312 int block; 313 struct kernel_lb_addr eloc; 314 uint32_t elen = 0; 315 sector_t offset; 316 struct extent_position epos = {}; 317 struct udf_inode_info *dinfo; 318 319 fibh->sbh = fibh->ebh = NULL; 320 name = kmalloc(UDF_NAME_LEN, GFP_NOFS); 321 if (!name) { 322 *err = -ENOMEM; 323 goto out_err; 324 } 325 326 if (dentry) { 327 if (!dentry->d_name.len) { 328 *err = -EINVAL; 329 goto out_err; 330 } 331 namelen = udf_put_filename(sb, dentry->d_name.name, name, 332 dentry->d_name.len); 333 if (!namelen) { 334 *err = -ENAMETOOLONG; 335 goto out_err; 336 } 337 } else { 338 namelen = 0; 339 } 340 341 nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3; 342 343 f_pos = udf_ext0_offset(dir); 344 345 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 346 dinfo = UDF_I(dir); 347 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 348 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 349 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 350 block = udf_get_lb_pblock(dir->i_sb, 351 &dinfo->i_location, 0); 352 fibh->soffset = fibh->eoffset = sb->s_blocksize; 353 goto add; 354 } 355 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 356 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 357 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 358 epos.offset -= sizeof(struct short_ad); 359 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 360 epos.offset -= sizeof(struct long_ad); 361 } else 362 offset = 0; 363 364 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 365 if (!fibh->sbh) { 366 *err = -EIO; 367 goto out_err; 368 } 369 370 block = dinfo->i_location.logicalBlockNum; 371 } 372 373 while (f_pos < size) { 374 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 375 &elen, &offset); 376 377 if (!fi) { 378 *err = -EIO; 379 goto out_err; 380 } 381 382 liu = le16_to_cpu(cfi->lengthOfImpUse); 383 lfi = cfi->lengthFileIdent; 384 385 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 386 if (((sizeof(struct fileIdentDesc) + 387 liu + lfi + 3) & ~3) == nfidlen) { 388 cfi->descTag.tagSerialNum = cpu_to_le16(1); 389 cfi->fileVersionNum = cpu_to_le16(1); 390 cfi->fileCharacteristics = 0; 391 cfi->lengthFileIdent = namelen; 392 cfi->lengthOfImpUse = cpu_to_le16(0); 393 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 394 name)) 395 goto out_ok; 396 else { 397 *err = -EIO; 398 goto out_err; 399 } 400 } 401 } 402 } 403 404 add: 405 f_pos += nfidlen; 406 407 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 408 sb->s_blocksize - fibh->eoffset < nfidlen) { 409 brelse(epos.bh); 410 epos.bh = NULL; 411 fibh->soffset -= udf_ext0_offset(dir); 412 fibh->eoffset -= udf_ext0_offset(dir); 413 f_pos -= udf_ext0_offset(dir); 414 if (fibh->sbh != fibh->ebh) 415 brelse(fibh->ebh); 416 brelse(fibh->sbh); 417 fibh->sbh = fibh->ebh = 418 udf_expand_dir_adinicb(dir, &block, err); 419 if (!fibh->sbh) 420 goto out_err; 421 epos.block = dinfo->i_location; 422 epos.offset = udf_file_entry_alloc_offset(dir); 423 /* Load extent udf_expand_dir_adinicb() has created */ 424 udf_current_aext(dir, &epos, &eloc, &elen, 1); 425 } 426 427 /* Entry fits into current block? */ 428 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 429 fibh->soffset = fibh->eoffset; 430 fibh->eoffset += nfidlen; 431 if (fibh->sbh != fibh->ebh) { 432 brelse(fibh->sbh); 433 fibh->sbh = fibh->ebh; 434 } 435 436 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 437 block = dinfo->i_location.logicalBlockNum; 438 fi = (struct fileIdentDesc *) 439 (dinfo->i_ext.i_data + 440 fibh->soffset - 441 udf_ext0_offset(dir) + 442 dinfo->i_lenEAttr); 443 } else { 444 block = eloc.logicalBlockNum + 445 ((elen - 1) >> 446 dir->i_sb->s_blocksize_bits); 447 fi = (struct fileIdentDesc *) 448 (fibh->sbh->b_data + fibh->soffset); 449 } 450 } else { 451 /* Round up last extent in the file */ 452 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 453 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 454 epos.offset -= sizeof(struct short_ad); 455 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 456 epos.offset -= sizeof(struct long_ad); 457 udf_write_aext(dir, &epos, &eloc, elen, 1); 458 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize 459 - 1) & ~(sb->s_blocksize - 1); 460 461 fibh->soffset = fibh->eoffset - sb->s_blocksize; 462 fibh->eoffset += nfidlen - sb->s_blocksize; 463 if (fibh->sbh != fibh->ebh) { 464 brelse(fibh->sbh); 465 fibh->sbh = fibh->ebh; 466 } 467 468 block = eloc.logicalBlockNum + ((elen - 1) >> 469 dir->i_sb->s_blocksize_bits); 470 fibh->ebh = udf_bread(dir, 471 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 472 if (!fibh->ebh) 473 goto out_err; 474 /* Extents could have been merged, invalidate our position */ 475 brelse(epos.bh); 476 epos.bh = NULL; 477 epos.block = dinfo->i_location; 478 epos.offset = udf_file_entry_alloc_offset(dir); 479 480 if (!fibh->soffset) { 481 /* Find the freshly allocated block */ 482 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 483 (EXT_RECORDED_ALLOCATED >> 30)) 484 ; 485 block = eloc.logicalBlockNum + ((elen - 1) >> 486 dir->i_sb->s_blocksize_bits); 487 brelse(fibh->sbh); 488 fibh->sbh = fibh->ebh; 489 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 490 } else { 491 fi = (struct fileIdentDesc *) 492 (fibh->sbh->b_data + sb->s_blocksize + 493 fibh->soffset); 494 } 495 } 496 497 memset(cfi, 0, sizeof(struct fileIdentDesc)); 498 if (UDF_SB(sb)->s_udfrev >= 0x0200) 499 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 500 sizeof(struct tag)); 501 else 502 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 503 sizeof(struct tag)); 504 cfi->fileVersionNum = cpu_to_le16(1); 505 cfi->lengthFileIdent = namelen; 506 cfi->lengthOfImpUse = cpu_to_le16(0); 507 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 508 dir->i_size += nfidlen; 509 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 510 dinfo->i_lenAlloc += nfidlen; 511 else { 512 /* Find the last extent and truncate it to proper size */ 513 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 514 (EXT_RECORDED_ALLOCATED >> 30)) 515 ; 516 elen -= dinfo->i_lenExtents - dir->i_size; 517 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 518 epos.offset -= sizeof(struct short_ad); 519 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 520 epos.offset -= sizeof(struct long_ad); 521 udf_write_aext(dir, &epos, &eloc, elen, 1); 522 dinfo->i_lenExtents = dir->i_size; 523 } 524 525 mark_inode_dirty(dir); 526 goto out_ok; 527 } else { 528 *err = -EIO; 529 goto out_err; 530 } 531 532 out_err: 533 fi = NULL; 534 if (fibh->sbh != fibh->ebh) 535 brelse(fibh->ebh); 536 brelse(fibh->sbh); 537 out_ok: 538 brelse(epos.bh); 539 kfree(name); 540 return fi; 541 } 542 543 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 544 struct udf_fileident_bh *fibh, 545 struct fileIdentDesc *cfi) 546 { 547 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 548 549 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 550 memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); 551 552 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 553 } 554 555 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode, 556 struct nameidata *nd) 557 { 558 struct udf_fileident_bh fibh; 559 struct inode *inode; 560 struct fileIdentDesc cfi, *fi; 561 int err; 562 struct udf_inode_info *iinfo; 563 564 inode = udf_new_inode(dir, mode, &err); 565 if (!inode) { 566 return err; 567 } 568 569 iinfo = UDF_I(inode); 570 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 571 inode->i_data.a_ops = &udf_adinicb_aops; 572 else 573 inode->i_data.a_ops = &udf_aops; 574 inode->i_op = &udf_file_inode_operations; 575 inode->i_fop = &udf_file_operations; 576 mark_inode_dirty(inode); 577 578 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 579 if (!fi) { 580 inode_dec_link_count(inode); 581 iput(inode); 582 return err; 583 } 584 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 585 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 586 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 587 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 588 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 589 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 590 mark_inode_dirty(dir); 591 if (fibh.sbh != fibh.ebh) 592 brelse(fibh.ebh); 593 brelse(fibh.sbh); 594 d_instantiate(dentry, inode); 595 596 return 0; 597 } 598 599 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 600 dev_t rdev) 601 { 602 struct inode *inode; 603 struct udf_fileident_bh fibh; 604 struct fileIdentDesc cfi, *fi; 605 int err; 606 struct udf_inode_info *iinfo; 607 608 if (!old_valid_dev(rdev)) 609 return -EINVAL; 610 611 err = -EIO; 612 inode = udf_new_inode(dir, mode, &err); 613 if (!inode) 614 goto out; 615 616 iinfo = UDF_I(inode); 617 init_special_inode(inode, mode, rdev); 618 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 619 if (!fi) { 620 inode_dec_link_count(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, umode_t 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 >= UDF_MAX_LINKS) 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_dec_link_count(inode); 667 iput(inode); 668 goto out; 669 } 670 set_nlink(inode, 2); 671 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 672 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 673 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 674 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 675 cfi.fileCharacteristics = 676 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 677 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 678 brelse(fibh.sbh); 679 mark_inode_dirty(inode); 680 681 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 682 if (!fi) { 683 clear_nlink(inode); 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 return err; 704 } 705 706 static int empty_dir(struct inode *dir) 707 { 708 struct fileIdentDesc *fi, cfi; 709 struct udf_fileident_bh fibh; 710 loff_t f_pos; 711 loff_t size = udf_ext0_offset(dir) + dir->i_size; 712 int block; 713 struct kernel_lb_addr eloc; 714 uint32_t elen; 715 sector_t offset; 716 struct extent_position epos = {}; 717 struct udf_inode_info *dinfo = UDF_I(dir); 718 719 f_pos = udf_ext0_offset(dir); 720 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 721 722 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 723 fibh.sbh = fibh.ebh = NULL; 724 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 725 &epos, &eloc, &elen, &offset) == 726 (EXT_RECORDED_ALLOCATED >> 30)) { 727 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 728 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 729 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 730 epos.offset -= sizeof(struct short_ad); 731 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 732 epos.offset -= sizeof(struct long_ad); 733 } else 734 offset = 0; 735 736 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 737 if (!fibh.sbh) { 738 brelse(epos.bh); 739 return 0; 740 } 741 } else { 742 brelse(epos.bh); 743 return 0; 744 } 745 746 while (f_pos < size) { 747 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 748 &elen, &offset); 749 if (!fi) { 750 if (fibh.sbh != fibh.ebh) 751 brelse(fibh.ebh); 752 brelse(fibh.sbh); 753 brelse(epos.bh); 754 return 0; 755 } 756 757 if (cfi.lengthFileIdent && 758 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 759 if (fibh.sbh != fibh.ebh) 760 brelse(fibh.ebh); 761 brelse(fibh.sbh); 762 brelse(epos.bh); 763 return 0; 764 } 765 } 766 767 if (fibh.sbh != fibh.ebh) 768 brelse(fibh.ebh); 769 brelse(fibh.sbh); 770 brelse(epos.bh); 771 772 return 1; 773 } 774 775 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 776 { 777 int retval; 778 struct inode *inode = dentry->d_inode; 779 struct udf_fileident_bh fibh; 780 struct fileIdentDesc *fi, cfi; 781 struct kernel_lb_addr tloc; 782 783 retval = -ENOENT; 784 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 785 if (!fi) 786 goto out; 787 788 retval = -EIO; 789 tloc = lelb_to_cpu(cfi.icb.extLocation); 790 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 791 goto end_rmdir; 792 retval = -ENOTEMPTY; 793 if (!empty_dir(inode)) 794 goto end_rmdir; 795 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 796 if (retval) 797 goto end_rmdir; 798 if (inode->i_nlink != 2) 799 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n", 800 inode->i_nlink); 801 clear_nlink(inode); 802 inode->i_size = 0; 803 inode_dec_link_count(dir); 804 inode->i_ctime = dir->i_ctime = dir->i_mtime = 805 current_fs_time(dir->i_sb); 806 mark_inode_dirty(dir); 807 808 end_rmdir: 809 if (fibh.sbh != fibh.ebh) 810 brelse(fibh.ebh); 811 brelse(fibh.sbh); 812 813 out: 814 return retval; 815 } 816 817 static int udf_unlink(struct inode *dir, struct dentry *dentry) 818 { 819 int retval; 820 struct inode *inode = dentry->d_inode; 821 struct udf_fileident_bh fibh; 822 struct fileIdentDesc *fi; 823 struct fileIdentDesc cfi; 824 struct kernel_lb_addr tloc; 825 826 retval = -ENOENT; 827 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 828 if (!fi) 829 goto out; 830 831 retval = -EIO; 832 tloc = lelb_to_cpu(cfi.icb.extLocation); 833 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 834 goto end_unlink; 835 836 if (!inode->i_nlink) { 837 udf_debug("Deleting nonexistent file (%lu), %d\n", 838 inode->i_ino, inode->i_nlink); 839 set_nlink(inode, 1); 840 } 841 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 842 if (retval) 843 goto end_unlink; 844 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); 845 mark_inode_dirty(dir); 846 inode_dec_link_count(inode); 847 inode->i_ctime = dir->i_ctime; 848 retval = 0; 849 850 end_unlink: 851 if (fibh.sbh != fibh.ebh) 852 brelse(fibh.ebh); 853 brelse(fibh.sbh); 854 855 out: 856 return retval; 857 } 858 859 static int udf_symlink(struct inode *dir, struct dentry *dentry, 860 const char *symname) 861 { 862 struct inode *inode; 863 struct pathComponent *pc; 864 const char *compstart; 865 struct udf_fileident_bh fibh; 866 struct extent_position epos = {}; 867 int eoffset, elen = 0; 868 struct fileIdentDesc *fi; 869 struct fileIdentDesc cfi; 870 uint8_t *ea; 871 int err; 872 int block; 873 unsigned char *name = NULL; 874 int namelen; 875 struct udf_inode_info *iinfo; 876 struct super_block *sb = dir->i_sb; 877 878 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err); 879 if (!inode) 880 goto out; 881 882 iinfo = UDF_I(inode); 883 down_write(&iinfo->i_data_sem); 884 name = kmalloc(UDF_NAME_LEN, GFP_NOFS); 885 if (!name) { 886 err = -ENOMEM; 887 goto out_no_entry; 888 } 889 890 inode->i_data.a_ops = &udf_symlink_aops; 891 inode->i_op = &udf_symlink_inode_operations; 892 893 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 894 struct kernel_lb_addr eloc; 895 uint32_t bsize; 896 897 block = udf_new_block(sb, inode, 898 iinfo->i_location.partitionReferenceNum, 899 iinfo->i_location.logicalBlockNum, &err); 900 if (!block) 901 goto out_no_entry; 902 epos.block = iinfo->i_location; 903 epos.offset = udf_file_entry_alloc_offset(inode); 904 epos.bh = NULL; 905 eloc.logicalBlockNum = block; 906 eloc.partitionReferenceNum = 907 iinfo->i_location.partitionReferenceNum; 908 bsize = sb->s_blocksize; 909 iinfo->i_lenExtents = bsize; 910 udf_add_aext(inode, &epos, &eloc, bsize, 0); 911 brelse(epos.bh); 912 913 block = udf_get_pblock(sb, block, 914 iinfo->i_location.partitionReferenceNum, 915 0); 916 epos.bh = udf_tgetblk(sb, block); 917 lock_buffer(epos.bh); 918 memset(epos.bh->b_data, 0x00, bsize); 919 set_buffer_uptodate(epos.bh); 920 unlock_buffer(epos.bh); 921 mark_buffer_dirty_inode(epos.bh, inode); 922 ea = epos.bh->b_data + udf_ext0_offset(inode); 923 } else 924 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; 925 926 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 927 pc = (struct pathComponent *)ea; 928 929 if (*symname == '/') { 930 do { 931 symname++; 932 } while (*symname == '/'); 933 934 pc->componentType = 1; 935 pc->lengthComponentIdent = 0; 936 pc->componentFileVersionNum = 0; 937 elen += sizeof(struct pathComponent); 938 } 939 940 err = -ENAMETOOLONG; 941 942 while (*symname) { 943 if (elen + sizeof(struct pathComponent) > eoffset) 944 goto out_no_entry; 945 946 pc = (struct pathComponent *)(ea + elen); 947 948 compstart = symname; 949 950 do { 951 symname++; 952 } while (*symname && *symname != '/'); 953 954 pc->componentType = 5; 955 pc->lengthComponentIdent = 0; 956 pc->componentFileVersionNum = 0; 957 if (compstart[0] == '.') { 958 if ((symname - compstart) == 1) 959 pc->componentType = 4; 960 else if ((symname - compstart) == 2 && 961 compstart[1] == '.') 962 pc->componentType = 3; 963 } 964 965 if (pc->componentType == 5) { 966 namelen = udf_put_filename(sb, compstart, name, 967 symname - compstart); 968 if (!namelen) 969 goto out_no_entry; 970 971 if (elen + sizeof(struct pathComponent) + namelen > 972 eoffset) 973 goto out_no_entry; 974 else 975 pc->lengthComponentIdent = namelen; 976 977 memcpy(pc->componentIdent, name, namelen); 978 } 979 980 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 981 982 if (*symname) { 983 do { 984 symname++; 985 } while (*symname == '/'); 986 } 987 } 988 989 brelse(epos.bh); 990 inode->i_size = elen; 991 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 992 iinfo->i_lenAlloc = inode->i_size; 993 else 994 udf_truncate_tail_extent(inode); 995 mark_inode_dirty(inode); 996 997 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 998 if (!fi) 999 goto out_no_entry; 1000 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize); 1001 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 1002 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1003 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1004 cpu_to_le32(lvid_get_unique_id(sb)); 1005 } 1006 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1007 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1008 mark_inode_dirty(dir); 1009 up_write(&iinfo->i_data_sem); 1010 if (fibh.sbh != fibh.ebh) 1011 brelse(fibh.ebh); 1012 brelse(fibh.sbh); 1013 d_instantiate(dentry, inode); 1014 err = 0; 1015 1016 out: 1017 kfree(name); 1018 return err; 1019 1020 out_no_entry: 1021 up_write(&iinfo->i_data_sem); 1022 inode_dec_link_count(inode); 1023 iput(inode); 1024 goto out; 1025 } 1026 1027 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1028 struct dentry *dentry) 1029 { 1030 struct inode *inode = old_dentry->d_inode; 1031 struct udf_fileident_bh fibh; 1032 struct fileIdentDesc cfi, *fi; 1033 int err; 1034 1035 if (inode->i_nlink >= UDF_MAX_LINKS) 1036 return -EMLINK; 1037 1038 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1039 if (!fi) { 1040 return err; 1041 } 1042 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1043 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1044 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1045 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1046 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1047 } 1048 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1049 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1050 mark_inode_dirty(dir); 1051 1052 if (fibh.sbh != fibh.ebh) 1053 brelse(fibh.ebh); 1054 brelse(fibh.sbh); 1055 inc_nlink(inode); 1056 inode->i_ctime = current_fs_time(inode->i_sb); 1057 mark_inode_dirty(inode); 1058 ihold(inode); 1059 d_instantiate(dentry, inode); 1060 1061 return 0; 1062 } 1063 1064 /* Anybody can rename anything with this: the permission checks are left to the 1065 * higher-level routines. 1066 */ 1067 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 1068 struct inode *new_dir, struct dentry *new_dentry) 1069 { 1070 struct inode *old_inode = old_dentry->d_inode; 1071 struct inode *new_inode = new_dentry->d_inode; 1072 struct udf_fileident_bh ofibh, nfibh; 1073 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1074 struct fileIdentDesc ocfi, ncfi; 1075 struct buffer_head *dir_bh = NULL; 1076 int retval = -ENOENT; 1077 struct kernel_lb_addr tloc; 1078 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1079 1080 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1081 if (ofi) { 1082 if (ofibh.sbh != ofibh.ebh) 1083 brelse(ofibh.ebh); 1084 brelse(ofibh.sbh); 1085 } 1086 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1087 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1088 != old_inode->i_ino) 1089 goto end_rename; 1090 1091 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1092 if (nfi) { 1093 if (!new_inode) { 1094 if (nfibh.sbh != nfibh.ebh) 1095 brelse(nfibh.ebh); 1096 brelse(nfibh.sbh); 1097 nfi = NULL; 1098 } 1099 } 1100 if (S_ISDIR(old_inode->i_mode)) { 1101 int offset = udf_ext0_offset(old_inode); 1102 1103 if (new_inode) { 1104 retval = -ENOTEMPTY; 1105 if (!empty_dir(new_inode)) 1106 goto end_rename; 1107 } 1108 retval = -EIO; 1109 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1110 dir_fi = udf_get_fileident( 1111 old_iinfo->i_ext.i_data - 1112 (old_iinfo->i_efe ? 1113 sizeof(struct extendedFileEntry) : 1114 sizeof(struct fileEntry)), 1115 old_inode->i_sb->s_blocksize, &offset); 1116 } else { 1117 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1118 if (!dir_bh) 1119 goto end_rename; 1120 dir_fi = udf_get_fileident(dir_bh->b_data, 1121 old_inode->i_sb->s_blocksize, &offset); 1122 } 1123 if (!dir_fi) 1124 goto end_rename; 1125 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1126 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1127 old_dir->i_ino) 1128 goto end_rename; 1129 1130 retval = -EMLINK; 1131 if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS) 1132 goto end_rename; 1133 } 1134 if (!nfi) { 1135 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1136 &retval); 1137 if (!nfi) 1138 goto end_rename; 1139 } 1140 1141 /* 1142 * Like most other Unix systems, set the ctime for inodes on a 1143 * rename. 1144 */ 1145 old_inode->i_ctime = current_fs_time(old_inode->i_sb); 1146 mark_inode_dirty(old_inode); 1147 1148 /* 1149 * ok, that's it 1150 */ 1151 ncfi.fileVersionNum = ocfi.fileVersionNum; 1152 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1153 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad)); 1154 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1155 1156 /* The old fid may have moved - find it again */ 1157 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1158 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1159 1160 if (new_inode) { 1161 new_inode->i_ctime = current_fs_time(new_inode->i_sb); 1162 inode_dec_link_count(new_inode); 1163 } 1164 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); 1165 mark_inode_dirty(old_dir); 1166 1167 if (dir_fi) { 1168 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1169 udf_update_tag((char *)dir_fi, 1170 (sizeof(struct fileIdentDesc) + 1171 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); 1172 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1173 mark_inode_dirty(old_inode); 1174 else 1175 mark_buffer_dirty_inode(dir_bh, old_inode); 1176 1177 inode_dec_link_count(old_dir); 1178 if (new_inode) 1179 inode_dec_link_count(new_inode); 1180 else { 1181 inc_nlink(new_dir); 1182 mark_inode_dirty(new_dir); 1183 } 1184 } 1185 1186 if (ofi) { 1187 if (ofibh.sbh != ofibh.ebh) 1188 brelse(ofibh.ebh); 1189 brelse(ofibh.sbh); 1190 } 1191 1192 retval = 0; 1193 1194 end_rename: 1195 brelse(dir_bh); 1196 if (nfi) { 1197 if (nfibh.sbh != nfibh.ebh) 1198 brelse(nfibh.ebh); 1199 brelse(nfibh.sbh); 1200 } 1201 1202 return retval; 1203 } 1204 1205 static struct dentry *udf_get_parent(struct dentry *child) 1206 { 1207 struct kernel_lb_addr tloc; 1208 struct inode *inode = NULL; 1209 struct qstr dotdot = {.name = "..", .len = 2}; 1210 struct fileIdentDesc cfi; 1211 struct udf_fileident_bh fibh; 1212 1213 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi)) 1214 goto out_unlock; 1215 1216 if (fibh.sbh != fibh.ebh) 1217 brelse(fibh.ebh); 1218 brelse(fibh.sbh); 1219 1220 tloc = lelb_to_cpu(cfi.icb.extLocation); 1221 inode = udf_iget(child->d_inode->i_sb, &tloc); 1222 if (!inode) 1223 goto out_unlock; 1224 1225 return d_obtain_alias(inode); 1226 out_unlock: 1227 return ERR_PTR(-EACCES); 1228 } 1229 1230 1231 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1232 u16 partref, __u32 generation) 1233 { 1234 struct inode *inode; 1235 struct kernel_lb_addr loc; 1236 1237 if (block == 0) 1238 return ERR_PTR(-ESTALE); 1239 1240 loc.logicalBlockNum = block; 1241 loc.partitionReferenceNum = partref; 1242 inode = udf_iget(sb, &loc); 1243 1244 if (inode == NULL) 1245 return ERR_PTR(-ENOMEM); 1246 1247 if (generation && inode->i_generation != generation) { 1248 iput(inode); 1249 return ERR_PTR(-ESTALE); 1250 } 1251 return d_obtain_alias(inode); 1252 } 1253 1254 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1255 struct fid *fid, int fh_len, int fh_type) 1256 { 1257 if ((fh_len != 3 && fh_len != 5) || 1258 (fh_type != FILEID_UDF_WITH_PARENT && 1259 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1260 return NULL; 1261 1262 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1263 fid->udf.generation); 1264 } 1265 1266 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1267 struct fid *fid, int fh_len, int fh_type) 1268 { 1269 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT) 1270 return NULL; 1271 1272 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1273 fid->udf.parent_partref, 1274 fid->udf.parent_generation); 1275 } 1276 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp, 1277 int connectable) 1278 { 1279 int len = *lenp; 1280 struct inode *inode = de->d_inode; 1281 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1282 struct fid *fid = (struct fid *)fh; 1283 int type = FILEID_UDF_WITHOUT_PARENT; 1284 1285 if (connectable && (len < 5)) { 1286 *lenp = 5; 1287 return 255; 1288 } else if (len < 3) { 1289 *lenp = 3; 1290 return 255; 1291 } 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