Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/namei.c
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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_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, 598 dev_t rdev) 599 { 600 struct inode *inode; 601 struct udf_fileident_bh fibh; 602 struct fileIdentDesc cfi, *fi; 603 int err; 604 struct udf_inode_info *iinfo; 605 606 if (!old_valid_dev(rdev)) 607 return -EINVAL; 608 609 err = -EIO; 610 inode = udf_new_inode(dir, mode, &err); 611 if (!inode) 612 goto out; 613 614 iinfo = UDF_I(inode); 615 init_special_inode(inode, mode, rdev); 616 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 617 if (!fi) { 618 inode_dec_link_count(inode); 619 iput(inode); 620 return err; 621 } 622 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 623 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 624 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 625 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 626 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 627 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 628 mark_inode_dirty(dir); 629 mark_inode_dirty(inode); 630 631 if (fibh.sbh != fibh.ebh) 632 brelse(fibh.ebh); 633 brelse(fibh.sbh); 634 d_instantiate(dentry, inode); 635 err = 0; 636 637 out: 638 return err; 639 } 640 641 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 642 { 643 struct inode *inode; 644 struct udf_fileident_bh fibh; 645 struct fileIdentDesc cfi, *fi; 646 int err; 647 struct udf_inode_info *dinfo = UDF_I(dir); 648 struct udf_inode_info *iinfo; 649 650 err = -EIO; 651 inode = udf_new_inode(dir, S_IFDIR | mode, &err); 652 if (!inode) 653 goto out; 654 655 iinfo = UDF_I(inode); 656 inode->i_op = &udf_dir_inode_operations; 657 inode->i_fop = &udf_dir_operations; 658 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 659 if (!fi) { 660 inode_dec_link_count(inode); 661 iput(inode); 662 goto out; 663 } 664 set_nlink(inode, 2); 665 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 666 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 667 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 668 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 669 cfi.fileCharacteristics = 670 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 671 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 672 brelse(fibh.sbh); 673 mark_inode_dirty(inode); 674 675 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 676 if (!fi) { 677 clear_nlink(inode); 678 mark_inode_dirty(inode); 679 iput(inode); 680 goto out; 681 } 682 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 683 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 684 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 685 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 686 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 687 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 688 inc_nlink(dir); 689 mark_inode_dirty(dir); 690 d_instantiate(dentry, inode); 691 if (fibh.sbh != fibh.ebh) 692 brelse(fibh.ebh); 693 brelse(fibh.sbh); 694 err = 0; 695 696 out: 697 return err; 698 } 699 700 static int empty_dir(struct inode *dir) 701 { 702 struct fileIdentDesc *fi, cfi; 703 struct udf_fileident_bh fibh; 704 loff_t f_pos; 705 loff_t size = udf_ext0_offset(dir) + dir->i_size; 706 int block; 707 struct kernel_lb_addr eloc; 708 uint32_t elen; 709 sector_t offset; 710 struct extent_position epos = {}; 711 struct udf_inode_info *dinfo = UDF_I(dir); 712 713 f_pos = udf_ext0_offset(dir); 714 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 715 716 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 717 fibh.sbh = fibh.ebh = NULL; 718 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 719 &epos, &eloc, &elen, &offset) == 720 (EXT_RECORDED_ALLOCATED >> 30)) { 721 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 722 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 723 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 724 epos.offset -= sizeof(struct short_ad); 725 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 726 epos.offset -= sizeof(struct long_ad); 727 } else 728 offset = 0; 729 730 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 731 if (!fibh.sbh) { 732 brelse(epos.bh); 733 return 0; 734 } 735 } else { 736 brelse(epos.bh); 737 return 0; 738 } 739 740 while (f_pos < size) { 741 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 742 &elen, &offset); 743 if (!fi) { 744 if (fibh.sbh != fibh.ebh) 745 brelse(fibh.ebh); 746 brelse(fibh.sbh); 747 brelse(epos.bh); 748 return 0; 749 } 750 751 if (cfi.lengthFileIdent && 752 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 753 if (fibh.sbh != fibh.ebh) 754 brelse(fibh.ebh); 755 brelse(fibh.sbh); 756 brelse(epos.bh); 757 return 0; 758 } 759 } 760 761 if (fibh.sbh != fibh.ebh) 762 brelse(fibh.ebh); 763 brelse(fibh.sbh); 764 brelse(epos.bh); 765 766 return 1; 767 } 768 769 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 770 { 771 int retval; 772 struct inode *inode = dentry->d_inode; 773 struct udf_fileident_bh fibh; 774 struct fileIdentDesc *fi, cfi; 775 struct kernel_lb_addr tloc; 776 777 retval = -ENOENT; 778 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 779 if (!fi) 780 goto out; 781 782 retval = -EIO; 783 tloc = lelb_to_cpu(cfi.icb.extLocation); 784 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 785 goto end_rmdir; 786 retval = -ENOTEMPTY; 787 if (!empty_dir(inode)) 788 goto end_rmdir; 789 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 790 if (retval) 791 goto end_rmdir; 792 if (inode->i_nlink != 2) 793 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n", 794 inode->i_nlink); 795 clear_nlink(inode); 796 inode->i_size = 0; 797 inode_dec_link_count(dir); 798 inode->i_ctime = dir->i_ctime = dir->i_mtime = 799 current_fs_time(dir->i_sb); 800 mark_inode_dirty(dir); 801 802 end_rmdir: 803 if (fibh.sbh != fibh.ebh) 804 brelse(fibh.ebh); 805 brelse(fibh.sbh); 806 807 out: 808 return retval; 809 } 810 811 static int udf_unlink(struct inode *dir, struct dentry *dentry) 812 { 813 int retval; 814 struct inode *inode = dentry->d_inode; 815 struct udf_fileident_bh fibh; 816 struct fileIdentDesc *fi; 817 struct fileIdentDesc cfi; 818 struct kernel_lb_addr tloc; 819 820 retval = -ENOENT; 821 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 822 if (!fi) 823 goto out; 824 825 retval = -EIO; 826 tloc = lelb_to_cpu(cfi.icb.extLocation); 827 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 828 goto end_unlink; 829 830 if (!inode->i_nlink) { 831 udf_debug("Deleting nonexistent file (%lu), %d\n", 832 inode->i_ino, inode->i_nlink); 833 set_nlink(inode, 1); 834 } 835 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 836 if (retval) 837 goto end_unlink; 838 dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb); 839 mark_inode_dirty(dir); 840 inode_dec_link_count(inode); 841 inode->i_ctime = dir->i_ctime; 842 retval = 0; 843 844 end_unlink: 845 if (fibh.sbh != fibh.ebh) 846 brelse(fibh.ebh); 847 brelse(fibh.sbh); 848 849 out: 850 return retval; 851 } 852 853 static int udf_symlink(struct inode *dir, struct dentry *dentry, 854 const char *symname) 855 { 856 struct inode *inode; 857 struct pathComponent *pc; 858 const char *compstart; 859 struct udf_fileident_bh fibh; 860 struct extent_position epos = {}; 861 int eoffset, elen = 0; 862 struct fileIdentDesc *fi; 863 struct fileIdentDesc cfi; 864 uint8_t *ea; 865 int err; 866 int block; 867 unsigned char *name = NULL; 868 int namelen; 869 struct udf_inode_info *iinfo; 870 struct super_block *sb = dir->i_sb; 871 872 inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err); 873 if (!inode) 874 goto out; 875 876 iinfo = UDF_I(inode); 877 down_write(&iinfo->i_data_sem); 878 name = kmalloc(UDF_NAME_LEN, GFP_NOFS); 879 if (!name) { 880 err = -ENOMEM; 881 goto out_no_entry; 882 } 883 884 inode->i_data.a_ops = &udf_symlink_aops; 885 inode->i_op = &udf_symlink_inode_operations; 886 887 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 888 struct kernel_lb_addr eloc; 889 uint32_t bsize; 890 891 block = udf_new_block(sb, inode, 892 iinfo->i_location.partitionReferenceNum, 893 iinfo->i_location.logicalBlockNum, &err); 894 if (!block) 895 goto out_no_entry; 896 epos.block = iinfo->i_location; 897 epos.offset = udf_file_entry_alloc_offset(inode); 898 epos.bh = NULL; 899 eloc.logicalBlockNum = block; 900 eloc.partitionReferenceNum = 901 iinfo->i_location.partitionReferenceNum; 902 bsize = sb->s_blocksize; 903 iinfo->i_lenExtents = bsize; 904 udf_add_aext(inode, &epos, &eloc, bsize, 0); 905 brelse(epos.bh); 906 907 block = udf_get_pblock(sb, block, 908 iinfo->i_location.partitionReferenceNum, 909 0); 910 epos.bh = udf_tgetblk(sb, block); 911 lock_buffer(epos.bh); 912 memset(epos.bh->b_data, 0x00, bsize); 913 set_buffer_uptodate(epos.bh); 914 unlock_buffer(epos.bh); 915 mark_buffer_dirty_inode(epos.bh, inode); 916 ea = epos.bh->b_data + udf_ext0_offset(inode); 917 } else 918 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr; 919 920 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 921 pc = (struct pathComponent *)ea; 922 923 if (*symname == '/') { 924 do { 925 symname++; 926 } while (*symname == '/'); 927 928 pc->componentType = 1; 929 pc->lengthComponentIdent = 0; 930 pc->componentFileVersionNum = 0; 931 elen += sizeof(struct pathComponent); 932 } 933 934 err = -ENAMETOOLONG; 935 936 while (*symname) { 937 if (elen + sizeof(struct pathComponent) > eoffset) 938 goto out_no_entry; 939 940 pc = (struct pathComponent *)(ea + elen); 941 942 compstart = symname; 943 944 do { 945 symname++; 946 } while (*symname && *symname != '/'); 947 948 pc->componentType = 5; 949 pc->lengthComponentIdent = 0; 950 pc->componentFileVersionNum = 0; 951 if (compstart[0] == '.') { 952 if ((symname - compstart) == 1) 953 pc->componentType = 4; 954 else if ((symname - compstart) == 2 && 955 compstart[1] == '.') 956 pc->componentType = 3; 957 } 958 959 if (pc->componentType == 5) { 960 namelen = udf_put_filename(sb, compstart, name, 961 symname - compstart); 962 if (!namelen) 963 goto out_no_entry; 964 965 if (elen + sizeof(struct pathComponent) + namelen > 966 eoffset) 967 goto out_no_entry; 968 else 969 pc->lengthComponentIdent = namelen; 970 971 memcpy(pc->componentIdent, name, namelen); 972 } 973 974 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 975 976 if (*symname) { 977 do { 978 symname++; 979 } while (*symname == '/'); 980 } 981 } 982 983 brelse(epos.bh); 984 inode->i_size = elen; 985 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 986 iinfo->i_lenAlloc = inode->i_size; 987 else 988 udf_truncate_tail_extent(inode); 989 mark_inode_dirty(inode); 990 991 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 992 if (!fi) 993 goto out_no_entry; 994 cfi.icb.extLength = cpu_to_le32(sb->s_blocksize); 995 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 996 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 997 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 998 cpu_to_le32(lvid_get_unique_id(sb)); 999 } 1000 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1001 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1002 mark_inode_dirty(dir); 1003 up_write(&iinfo->i_data_sem); 1004 if (fibh.sbh != fibh.ebh) 1005 brelse(fibh.ebh); 1006 brelse(fibh.sbh); 1007 d_instantiate(dentry, inode); 1008 err = 0; 1009 1010 out: 1011 kfree(name); 1012 return err; 1013 1014 out_no_entry: 1015 up_write(&iinfo->i_data_sem); 1016 inode_dec_link_count(inode); 1017 iput(inode); 1018 goto out; 1019 } 1020 1021 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1022 struct dentry *dentry) 1023 { 1024 struct inode *inode = old_dentry->d_inode; 1025 struct udf_fileident_bh fibh; 1026 struct fileIdentDesc cfi, *fi; 1027 int err; 1028 1029 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1030 if (!fi) { 1031 return err; 1032 } 1033 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1034 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1035 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1036 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1037 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1038 } 1039 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1040 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1041 mark_inode_dirty(dir); 1042 1043 if (fibh.sbh != fibh.ebh) 1044 brelse(fibh.ebh); 1045 brelse(fibh.sbh); 1046 inc_nlink(inode); 1047 inode->i_ctime = current_fs_time(inode->i_sb); 1048 mark_inode_dirty(inode); 1049 ihold(inode); 1050 d_instantiate(dentry, inode); 1051 1052 return 0; 1053 } 1054 1055 /* Anybody can rename anything with this: the permission checks are left to the 1056 * higher-level routines. 1057 */ 1058 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 1059 struct inode *new_dir, struct dentry *new_dentry) 1060 { 1061 struct inode *old_inode = old_dentry->d_inode; 1062 struct inode *new_inode = new_dentry->d_inode; 1063 struct udf_fileident_bh ofibh, nfibh; 1064 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1065 struct fileIdentDesc ocfi, ncfi; 1066 struct buffer_head *dir_bh = NULL; 1067 int retval = -ENOENT; 1068 struct kernel_lb_addr tloc; 1069 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1070 1071 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1072 if (ofi) { 1073 if (ofibh.sbh != ofibh.ebh) 1074 brelse(ofibh.ebh); 1075 brelse(ofibh.sbh); 1076 } 1077 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1078 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1079 != old_inode->i_ino) 1080 goto end_rename; 1081 1082 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1083 if (nfi) { 1084 if (!new_inode) { 1085 if (nfibh.sbh != nfibh.ebh) 1086 brelse(nfibh.ebh); 1087 brelse(nfibh.sbh); 1088 nfi = NULL; 1089 } 1090 } 1091 if (S_ISDIR(old_inode->i_mode)) { 1092 int offset = udf_ext0_offset(old_inode); 1093 1094 if (new_inode) { 1095 retval = -ENOTEMPTY; 1096 if (!empty_dir(new_inode)) 1097 goto end_rename; 1098 } 1099 retval = -EIO; 1100 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1101 dir_fi = udf_get_fileident( 1102 old_iinfo->i_ext.i_data - 1103 (old_iinfo->i_efe ? 1104 sizeof(struct extendedFileEntry) : 1105 sizeof(struct fileEntry)), 1106 old_inode->i_sb->s_blocksize, &offset); 1107 } else { 1108 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1109 if (!dir_bh) 1110 goto end_rename; 1111 dir_fi = udf_get_fileident(dir_bh->b_data, 1112 old_inode->i_sb->s_blocksize, &offset); 1113 } 1114 if (!dir_fi) 1115 goto end_rename; 1116 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1117 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1118 old_dir->i_ino) 1119 goto end_rename; 1120 } 1121 if (!nfi) { 1122 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1123 &retval); 1124 if (!nfi) 1125 goto end_rename; 1126 } 1127 1128 /* 1129 * Like most other Unix systems, set the ctime for inodes on a 1130 * rename. 1131 */ 1132 old_inode->i_ctime = current_fs_time(old_inode->i_sb); 1133 mark_inode_dirty(old_inode); 1134 1135 /* 1136 * ok, that's it 1137 */ 1138 ncfi.fileVersionNum = ocfi.fileVersionNum; 1139 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1140 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad)); 1141 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1142 1143 /* The old fid may have moved - find it again */ 1144 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1145 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1146 1147 if (new_inode) { 1148 new_inode->i_ctime = current_fs_time(new_inode->i_sb); 1149 inode_dec_link_count(new_inode); 1150 } 1151 old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb); 1152 mark_inode_dirty(old_dir); 1153 1154 if (dir_fi) { 1155 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1156 udf_update_tag((char *)dir_fi, 1157 (sizeof(struct fileIdentDesc) + 1158 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3); 1159 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1160 mark_inode_dirty(old_inode); 1161 else 1162 mark_buffer_dirty_inode(dir_bh, old_inode); 1163 1164 inode_dec_link_count(old_dir); 1165 if (new_inode) 1166 inode_dec_link_count(new_inode); 1167 else { 1168 inc_nlink(new_dir); 1169 mark_inode_dirty(new_dir); 1170 } 1171 } 1172 1173 if (ofi) { 1174 if (ofibh.sbh != ofibh.ebh) 1175 brelse(ofibh.ebh); 1176 brelse(ofibh.sbh); 1177 } 1178 1179 retval = 0; 1180 1181 end_rename: 1182 brelse(dir_bh); 1183 if (nfi) { 1184 if (nfibh.sbh != nfibh.ebh) 1185 brelse(nfibh.ebh); 1186 brelse(nfibh.sbh); 1187 } 1188 1189 return retval; 1190 } 1191 1192 static struct dentry *udf_get_parent(struct dentry *child) 1193 { 1194 struct kernel_lb_addr tloc; 1195 struct inode *inode = NULL; 1196 struct qstr dotdot = QSTR_INIT("..", 2); 1197 struct fileIdentDesc cfi; 1198 struct udf_fileident_bh fibh; 1199 1200 if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi)) 1201 goto out_unlock; 1202 1203 if (fibh.sbh != fibh.ebh) 1204 brelse(fibh.ebh); 1205 brelse(fibh.sbh); 1206 1207 tloc = lelb_to_cpu(cfi.icb.extLocation); 1208 inode = udf_iget(child->d_inode->i_sb, &tloc); 1209 if (!inode) 1210 goto out_unlock; 1211 1212 return d_obtain_alias(inode); 1213 out_unlock: 1214 return ERR_PTR(-EACCES); 1215 } 1216 1217 1218 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1219 u16 partref, __u32 generation) 1220 { 1221 struct inode *inode; 1222 struct kernel_lb_addr loc; 1223 1224 if (block == 0) 1225 return ERR_PTR(-ESTALE); 1226 1227 loc.logicalBlockNum = block; 1228 loc.partitionReferenceNum = partref; 1229 inode = udf_iget(sb, &loc); 1230 1231 if (inode == NULL) 1232 return ERR_PTR(-ENOMEM); 1233 1234 if (generation && inode->i_generation != generation) { 1235 iput(inode); 1236 return ERR_PTR(-ESTALE); 1237 } 1238 return d_obtain_alias(inode); 1239 } 1240 1241 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1242 struct fid *fid, int fh_len, int fh_type) 1243 { 1244 if ((fh_len != 3 && fh_len != 5) || 1245 (fh_type != FILEID_UDF_WITH_PARENT && 1246 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1247 return NULL; 1248 1249 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1250 fid->udf.generation); 1251 } 1252 1253 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1254 struct fid *fid, int fh_len, int fh_type) 1255 { 1256 if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT) 1257 return NULL; 1258 1259 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1260 fid->udf.parent_partref, 1261 fid->udf.parent_generation); 1262 } 1263 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1264 struct inode *parent) 1265 { 1266 int len = *lenp; 1267 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1268 struct fid *fid = (struct fid *)fh; 1269 int type = FILEID_UDF_WITHOUT_PARENT; 1270 1271 if (parent && (len < 5)) { 1272 *lenp = 5; 1273 return 255; 1274 } else if (len < 3) { 1275 *lenp = 3; 1276 return 255; 1277 } 1278 1279 *lenp = 3; 1280 fid->udf.block = location.logicalBlockNum; 1281 fid->udf.partref = location.partitionReferenceNum; 1282 fid->udf.parent_partref = 0; 1283 fid->udf.generation = inode->i_generation; 1284 1285 if (parent) { 1286 location = UDF_I(parent)->i_location; 1287 fid->udf.parent_block = location.logicalBlockNum; 1288 fid->udf.parent_partref = location.partitionReferenceNum; 1289 fid->udf.parent_generation = inode->i_generation; 1290 *lenp = 5; 1291 type = FILEID_UDF_WITH_PARENT; 1292 } 1293 1294 return type; 1295 } 1296 1297 const struct export_operations udf_export_ops = { 1298 .encode_fh = udf_encode_fh, 1299 .fh_to_dentry = udf_fh_to_dentry, 1300 .fh_to_parent = udf_fh_to_parent, 1301 .get_parent = udf_get_parent, 1302 }; 1303 1304 const struct inode_operations udf_dir_inode_operations = { 1305 .lookup = udf_lookup, 1306 .create = udf_create, 1307 .link = udf_link, 1308 .unlink = udf_unlink, 1309 .symlink = udf_symlink, 1310 .mkdir = udf_mkdir, 1311 .rmdir = udf_rmdir, 1312 .mknod = udf_mknod, 1313 .rename = udf_rename, 1314 }; 1315 const struct inode_operations udf_symlink_inode_operations = { 1316 .readlink = generic_readlink, 1317 .follow_link = page_follow_link_light, 1318 .put_link = page_put_link, 1319 };
Cache object: 040552a12b527477ecc0faa228d07a44
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