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 unsigned int flags) 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, umode_t mode, 554 bool excl) 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_dec_link_count(inode); 579 iput(inode); 580 return err; 581 } 582 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 583 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 584 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 585 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 586 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 587 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 588 mark_inode_dirty(dir); 589 if (fibh.sbh != fibh.ebh) 590 brelse(fibh.ebh); 591 brelse(fibh.sbh); 592 d_instantiate(dentry, inode); 593 594 return 0; 595 } 596 597 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) 598 { 599 struct inode *inode; 600 struct udf_inode_info *iinfo; 601 int err; 602 603 inode = udf_new_inode(dir, mode, &err); 604 if (!inode) 605 return err; 606 607 iinfo = UDF_I(inode); 608 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 609 inode->i_data.a_ops = &udf_adinicb_aops; 610 else 611 inode->i_data.a_ops = &udf_aops; 612 inode->i_op = &udf_file_inode_operations; 613 inode->i_fop = &udf_file_operations; 614 mark_inode_dirty(inode); 615 616 d_tmpfile(dentry, inode); 617 return 0; 618 } 619 620 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 621 dev_t rdev) 622 { 623 struct inode *inode; 624 struct udf_fileident_bh fibh; 625 struct fileIdentDesc cfi, *fi; 626 int err; 627 struct udf_inode_info *iinfo; 628 629 if (!old_valid_dev(rdev)) 630 return -EINVAL; 631 632 err = -EIO; 633 inode = udf_new_inode(dir, mode, &err); 634 if (!inode) 635 goto out; 636 637 iinfo = UDF_I(inode); 638 init_special_inode(inode, mode, rdev); 639 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 640 if (!fi) { 641 inode_dec_link_count(inode); 642 iput(inode); 643 return err; 644 } 645 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 646 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 647 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 648 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 649 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 650 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 651 mark_inode_dirty(dir); 652 mark_inode_dirty(inode); 653 654 if (fibh.sbh != fibh.ebh) 655 brelse(fibh.ebh); 656 brelse(fibh.sbh); 657 d_instantiate(dentry, inode); 658 err = 0; 659 660 out: 661 return err; 662 } 663 664 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 665 { 666 struct inode *inode; 667 struct udf_fileident_bh fibh; 668 struct fileIdentDesc cfi, *fi; 669 int err; 670 struct udf_inode_info *dinfo = UDF_I(dir); 671 struct udf_inode_info *iinfo; 672 673 err = -EIO; 674 inode = udf_new_inode(dir, S_IFDIR | mode, &err); 675 if (!inode) 676 goto out; 677 678 iinfo = UDF_I(inode); 679 inode->i_op = &udf_dir_inode_operations; 680 inode->i_fop = &udf_dir_operations; 681 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 682 if (!fi) { 683 inode_dec_link_count(inode); 684 iput(inode); 685 goto out; 686 } 687 set_nlink(inode, 2); 688 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 689 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 690 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 691 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 692 cfi.fileCharacteristics = 693 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 694 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 695 brelse(fibh.sbh); 696 mark_inode_dirty(inode); 697 698 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 699 if (!fi) { 700 clear_nlink(inode); 701 mark_inode_dirty(inode); 702 iput(inode); 703 goto out; 704 } 705 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 706 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 707 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 708 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 709 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 710 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 711 inc_nlink(dir); 712 mark_inode_dirty(dir); 713 d_instantiate(dentry, inode); 714 if (fibh.sbh != fibh.ebh) 715 brelse(fibh.ebh); 716 brelse(fibh.sbh); 717 err = 0; 718 719 out: 720 return err; 721 } 722 723 static int empty_dir(struct inode *dir) 724 { 725 struct fileIdentDesc *fi, cfi; 726 struct udf_fileident_bh fibh; 727 loff_t f_pos; 728 loff_t size = udf_ext0_offset(dir) + dir->i_size; 729 int block; 730 struct kernel_lb_addr eloc; 731 uint32_t elen; 732 sector_t offset; 733 struct extent_position epos = {}; 734 struct udf_inode_info *dinfo = UDF_I(dir); 735 736 f_pos = udf_ext0_offset(dir); 737 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 738 739 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 740 fibh.sbh = fibh.ebh = NULL; 741 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 742 &epos, &eloc, &elen, &offset) == 743 (EXT_RECORDED_ALLOCATED >> 30)) { 744 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 745 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 746 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 747 epos.offset -= sizeof(struct short_ad); 748 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 749 epos.offset -= sizeof(struct long_ad); 750 } else 751 offset = 0; 752 753 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 754 if (!fibh.sbh) { 755 brelse(epos.bh); 756 return 0; 757 } 758 } else { 759 brelse(epos.bh); 760 return 0; 761 } 762 763 while (f_pos < size) { 764 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 765 &elen, &offset); 766 if (!fi) { 767 if (fibh.sbh != fibh.ebh) 768 brelse(fibh.ebh); 769 brelse(fibh.sbh); 770 brelse(epos.bh); 771 return 0; 772 } 773 774 if (cfi.lengthFileIdent && 775 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 776 if (fibh.sbh != fibh.ebh) 777 brelse(fibh.ebh); 778 brelse(fibh.sbh); 779 brelse(epos.bh); 780 return 0; 781 } 782 } 783 784 if (fibh.sbh != fibh.ebh) 785 brelse(fibh.ebh); 786 brelse(fibh.sbh); 787 brelse(epos.bh); 788 789 return 1; 790 } 791 792 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 793 { 794 int retval; 795 struct inode *inode = dentry->d_inode; 796 struct udf_fileident_bh fibh; 797 struct fileIdentDesc *fi, cfi; 798 struct kernel_lb_addr tloc; 799 800 retval = -ENOENT; 801 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 802 if (!fi) 803 goto out; 804 805 retval = -EIO; 806 tloc = lelb_to_cpu(cfi.icb.extLocation); 807 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 808 goto end_rmdir; 809 retval = -ENOTEMPTY; 810 if (!empty_dir(inode)) 811 goto end_rmdir; 812 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 813 if (retval) 814 goto end_rmdir; 815 if (inode->i_nlink != 2) 816 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n", 817 inode->i_nlink); 818 clear_nlink(inode); 819 inode->i_size = 0; 820 inode_dec_link_count(dir); 821 inode->i_ctime = dir->i_ctime = dir->i_mtime = 822 current_fs_time(dir->i_sb); 823 mark_inode_dirty(dir); 824 825 end_rmdir: 826 if (fibh.sbh != fibh.ebh) 827 brelse(fibh.ebh); 828 brelse(fibh.sbh); 829 830 out: 831 return retval; 832 } 833 834 static int udf_unlink(struct inode *dir, struct dentry *dentry) 835 { 836 int retval; 837 struct inode *inode = dentry->d_inode; 838 struct udf_fileident_bh fibh; 839 struct fileIdentDesc *fi; 840 struct fileIdentDesc cfi; 841 struct kernel_lb_addr tloc; 842 843 retval = -ENOENT; 844 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 845 if (!fi) 846 goto out; 847 848 retval = -EIO; 849 tloc = lelb_to_cpu(cfi.icb.extLocation); 850 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 851 goto end_unlink; 852 853 if (!inode->i_nlink) { 854 udf_debug("Deleting nonexistent file (%lu), %d\n", 855 inode->i_ino, inode->i_nlink); 856 set_nlink(inode, 1); 857 } 858 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 859 if (retval) 860 goto end_unlink; 861 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); 862 mark_inode_dirty(dir); 863 inode_dec_link_count(inode); 864 inode->i_ctime = dir->i_ctime; 865 retval = 0; 866 867 end_unlink: 868 if (fibh.sbh != fibh.ebh) 869 brelse(fibh.ebh); 870 brelse(fibh.sbh); 871 872 out: 873 return retval; 874 } 875 876 static int udf_symlink(struct inode *dir, struct dentry *dentry, 877 const char *symname) 878 { 879 struct inode *inode; 880 struct pathComponent *pc; 881 const char *compstart; 882 struct udf_fileident_bh fibh; 883 struct extent_position epos = {}; 884 int eoffset, elen = 0; 885 struct fileIdentDesc *fi; 886 struct fileIdentDesc cfi; 887 uint8_t *ea; 888 int err; 889 int block; 890 unsigned char *name = NULL; 891 int namelen; 892 struct udf_inode_info *iinfo; 893 struct super_block *sb = dir->i_sb; 894 895 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err); 896 if (!inode) 897 goto out; 898 899 iinfo = UDF_I(inode); 900 down_write(&iinfo->i_data_sem); 901 name = kmalloc(UDF_NAME_LEN, GFP_NOFS); 902 if (!name) { 903 err = -ENOMEM; 904 goto out_no_entry; 905 } 906 907 inode->i_data.a_ops = &udf_symlink_aops; 908 inode->i_op = &udf_symlink_inode_operations; 909 910 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 911 struct kernel_lb_addr eloc; 912 uint32_t bsize; 913 914 block = udf_new_block(sb, inode, 915 iinfo->i_location.partitionReferenceNum, 916 iinfo->i_location.logicalBlockNum, &err); 917 if (!block) 918 goto out_no_entry; 919 epos.block = iinfo->i_location; 920 epos.offset = udf_file_entry_alloc_offset(inode); 921 epos.bh = NULL; 922 eloc.logicalBlockNum = block; 923 eloc.partitionReferenceNum = 924 iinfo->i_location.partitionReferenceNum; 925 bsize = sb->s_blocksize; 926 iinfo->i_lenExtents = bsize; 927 udf_add_aext(inode, &epos, &eloc, bsize, 0); 928 brelse(epos.bh); 929 930 block = udf_get_pblock(sb, block, 931 iinfo->i_location.partitionReferenceNum, 932 0); 933 epos.bh = udf_tgetblk(sb, block); 934 lock_buffer(epos.bh); 935 memset(epos.bh->b_data, 0x00, bsize); 936 set_buffer_uptodate(epos.bh); 937 unlock_buffer(epos.bh); 938 mark_buffer_dirty_inode(epos.bh, inode); 939 ea = epos.bh->b_data + udf_ext0_offset(inode); 940 } else 941 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; 942 943 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 944 pc = (struct pathComponent *)ea; 945 946 if (*symname == '/') { 947 do { 948 symname++; 949 } while (*symname == '/'); 950 951 pc->componentType = 1; 952 pc->lengthComponentIdent = 0; 953 pc->componentFileVersionNum = 0; 954 elen += sizeof(struct pathComponent); 955 } 956 957 err = -ENAMETOOLONG; 958 959 while (*symname) { 960 if (elen + sizeof(struct pathComponent) > eoffset) 961 goto out_no_entry; 962 963 pc = (struct pathComponent *)(ea + elen); 964 965 compstart = symname; 966 967 do { 968 symname++; 969 } while (*symname && *symname != '/'); 970 971 pc->componentType = 5; 972 pc->lengthComponentIdent = 0; 973 pc->componentFileVersionNum = 0; 974 if (compstart[0] == '.') { 975 if ((symname - compstart) == 1) 976 pc->componentType = 4; 977 else if ((symname - compstart) == 2 && 978 compstart[1] == '.') 979 pc->componentType = 3; 980 } 981 982 if (pc->componentType == 5) { 983 namelen = udf_put_filename(sb, compstart, name, 984 symname - compstart); 985 if (!namelen) 986 goto out_no_entry; 987 988 if (elen + sizeof(struct pathComponent) + namelen > 989 eoffset) 990 goto out_no_entry; 991 else 992 pc->lengthComponentIdent = namelen; 993 994 memcpy(pc->componentIdent, name, namelen); 995 } 996 997 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 998 999 if (*symname) { 1000 do { 1001 symname++; 1002 } while (*symname == '/'); 1003 } 1004 } 1005 1006 brelse(epos.bh); 1007 inode->i_size = elen; 1008 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1009 iinfo->i_lenAlloc = inode->i_size; 1010 else 1011 udf_truncate_tail_extent(inode); 1012 mark_inode_dirty(inode); 1013 up_write(&iinfo->i_data_sem); 1014 1015 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1016 if (!fi) 1017 goto out_no_entry; 1018 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize); 1019 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 1020 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1021 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1022 cpu_to_le32(lvid_get_unique_id(sb)); 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 return err; 1036 1037 out_no_entry: 1038 up_write(&iinfo->i_data_sem); 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 1052 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1053 if (!fi) { 1054 return err; 1055 } 1056 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1057 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1058 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1059 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1060 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1061 } 1062 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1063 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1064 mark_inode_dirty(dir); 1065 1066 if (fibh.sbh != fibh.ebh) 1067 brelse(fibh.ebh); 1068 brelse(fibh.sbh); 1069 inc_nlink(inode); 1070 inode->i_ctime = current_fs_time(inode->i_sb); 1071 mark_inode_dirty(inode); 1072 ihold(inode); 1073 d_instantiate(dentry, inode); 1074 1075 return 0; 1076 } 1077 1078 /* Anybody can rename anything with this: the permission checks are left to the 1079 * higher-level routines. 1080 */ 1081 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 1082 struct inode *new_dir, struct dentry *new_dentry) 1083 { 1084 struct inode *old_inode = old_dentry->d_inode; 1085 struct inode *new_inode = new_dentry->d_inode; 1086 struct udf_fileident_bh ofibh, nfibh; 1087 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1088 struct fileIdentDesc ocfi, ncfi; 1089 struct buffer_head *dir_bh = NULL; 1090 int retval = -ENOENT; 1091 struct kernel_lb_addr tloc; 1092 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1093 1094 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1095 if (ofi) { 1096 if (ofibh.sbh != ofibh.ebh) 1097 brelse(ofibh.ebh); 1098 brelse(ofibh.sbh); 1099 } 1100 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1101 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1102 != old_inode->i_ino) 1103 goto end_rename; 1104 1105 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1106 if (nfi) { 1107 if (!new_inode) { 1108 if (nfibh.sbh != nfibh.ebh) 1109 brelse(nfibh.ebh); 1110 brelse(nfibh.sbh); 1111 nfi = NULL; 1112 } 1113 } 1114 if (S_ISDIR(old_inode->i_mode)) { 1115 int offset = udf_ext0_offset(old_inode); 1116 1117 if (new_inode) { 1118 retval = -ENOTEMPTY; 1119 if (!empty_dir(new_inode)) 1120 goto end_rename; 1121 } 1122 retval = -EIO; 1123 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1124 dir_fi = udf_get_fileident( 1125 old_iinfo->i_ext.i_data - 1126 (old_iinfo->i_efe ? 1127 sizeof(struct extendedFileEntry) : 1128 sizeof(struct fileEntry)), 1129 old_inode->i_sb->s_blocksize, &offset); 1130 } else { 1131 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1132 if (!dir_bh) 1133 goto end_rename; 1134 dir_fi = udf_get_fileident(dir_bh->b_data, 1135 old_inode->i_sb->s_blocksize, &offset); 1136 } 1137 if (!dir_fi) 1138 goto end_rename; 1139 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1140 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1141 old_dir->i_ino) 1142 goto end_rename; 1143 } 1144 if (!nfi) { 1145 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1146 &retval); 1147 if (!nfi) 1148 goto end_rename; 1149 } 1150 1151 /* 1152 * Like most other Unix systems, set the ctime for inodes on a 1153 * rename. 1154 */ 1155 old_inode->i_ctime = current_fs_time(old_inode->i_sb); 1156 mark_inode_dirty(old_inode); 1157 1158 /* 1159 * ok, that's it 1160 */ 1161 ncfi.fileVersionNum = ocfi.fileVersionNum; 1162 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1163 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad)); 1164 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1165 1166 /* The old fid may have moved - find it again */ 1167 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1168 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1169 1170 if (new_inode) { 1171 new_inode->i_ctime = current_fs_time(new_inode->i_sb); 1172 inode_dec_link_count(new_inode); 1173 } 1174 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); 1175 mark_inode_dirty(old_dir); 1176 1177 if (dir_fi) { 1178 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1179 udf_update_tag((char *)dir_fi, 1180 (sizeof(struct fileIdentDesc) + 1181 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); 1182 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1183 mark_inode_dirty(old_inode); 1184 else 1185 mark_buffer_dirty_inode(dir_bh, old_inode); 1186 1187 inode_dec_link_count(old_dir); 1188 if (new_inode) 1189 inode_dec_link_count(new_inode); 1190 else { 1191 inc_nlink(new_dir); 1192 mark_inode_dirty(new_dir); 1193 } 1194 } 1195 1196 if (ofi) { 1197 if (ofibh.sbh != ofibh.ebh) 1198 brelse(ofibh.ebh); 1199 brelse(ofibh.sbh); 1200 } 1201 1202 retval = 0; 1203 1204 end_rename: 1205 brelse(dir_bh); 1206 if (nfi) { 1207 if (nfibh.sbh != nfibh.ebh) 1208 brelse(nfibh.ebh); 1209 brelse(nfibh.sbh); 1210 } 1211 1212 return retval; 1213 } 1214 1215 static struct dentry *udf_get_parent(struct dentry *child) 1216 { 1217 struct kernel_lb_addr tloc; 1218 struct inode *inode = NULL; 1219 struct qstr dotdot = QSTR_INIT("..", 2); 1220 struct fileIdentDesc cfi; 1221 struct udf_fileident_bh fibh; 1222 1223 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi)) 1224 goto out_unlock; 1225 1226 if (fibh.sbh != fibh.ebh) 1227 brelse(fibh.ebh); 1228 brelse(fibh.sbh); 1229 1230 tloc = lelb_to_cpu(cfi.icb.extLocation); 1231 inode = udf_iget(child->d_inode->i_sb, &tloc); 1232 if (!inode) 1233 goto out_unlock; 1234 1235 return d_obtain_alias(inode); 1236 out_unlock: 1237 return ERR_PTR(-EACCES); 1238 } 1239 1240 1241 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1242 u16 partref, __u32 generation) 1243 { 1244 struct inode *inode; 1245 struct kernel_lb_addr loc; 1246 1247 if (block == 0) 1248 return ERR_PTR(-ESTALE); 1249 1250 loc.logicalBlockNum = block; 1251 loc.partitionReferenceNum = partref; 1252 inode = udf_iget(sb, &loc); 1253 1254 if (inode == NULL) 1255 return ERR_PTR(-ENOMEM); 1256 1257 if (generation && inode->i_generation != generation) { 1258 iput(inode); 1259 return ERR_PTR(-ESTALE); 1260 } 1261 return d_obtain_alias(inode); 1262 } 1263 1264 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1265 struct fid *fid, int fh_len, int fh_type) 1266 { 1267 if ((fh_len != 3 && fh_len != 5) || 1268 (fh_type != FILEID_UDF_WITH_PARENT && 1269 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1270 return NULL; 1271 1272 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1273 fid->udf.generation); 1274 } 1275 1276 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1277 struct fid *fid, int fh_len, int fh_type) 1278 { 1279 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT) 1280 return NULL; 1281 1282 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1283 fid->udf.parent_partref, 1284 fid->udf.parent_generation); 1285 } 1286 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1287 struct inode *parent) 1288 { 1289 int len = *lenp; 1290 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1291 struct fid *fid = (struct fid *)fh; 1292 int type = FILEID_UDF_WITHOUT_PARENT; 1293 1294 if (parent && (len < 5)) { 1295 *lenp = 5; 1296 return FILEID_INVALID; 1297 } else if (len < 3) { 1298 *lenp = 3; 1299 return FILEID_INVALID; 1300 } 1301 1302 *lenp = 3; 1303 fid->udf.block = location.logicalBlockNum; 1304 fid->udf.partref = location.partitionReferenceNum; 1305 fid->udf.parent_partref = 0; 1306 fid->udf.generation = inode->i_generation; 1307 1308 if (parent) { 1309 location = UDF_I(parent)->i_location; 1310 fid->udf.parent_block = location.logicalBlockNum; 1311 fid->udf.parent_partref = location.partitionReferenceNum; 1312 fid->udf.parent_generation = inode->i_generation; 1313 *lenp = 5; 1314 type = FILEID_UDF_WITH_PARENT; 1315 } 1316 1317 return type; 1318 } 1319 1320 const struct export_operations udf_export_ops = { 1321 .encode_fh = udf_encode_fh, 1322 .fh_to_dentry = udf_fh_to_dentry, 1323 .fh_to_parent = udf_fh_to_parent, 1324 .get_parent = udf_get_parent, 1325 }; 1326 1327 const struct inode_operations udf_dir_inode_operations = { 1328 .lookup = udf_lookup, 1329 .create = udf_create, 1330 .link = udf_link, 1331 .unlink = udf_unlink, 1332 .symlink = udf_symlink, 1333 .mkdir = udf_mkdir, 1334 .rmdir = udf_rmdir, 1335 .mknod = udf_mknod, 1336 .rename = udf_rename, 1337 .tmpfile = udf_tmpfile, 1338 }; 1339 const struct inode_operations udf_symlink_inode_operations = { 1340 .readlink = generic_readlink, 1341 .follow_link = page_follow_link_light, 1342 .put_link = page_put_link, 1343 }; 1344