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/sched.h> 31 #include <linux/crc-itu-t.h> 32 #include <linux/exportfs.h> 33 #include <linux/iversion.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(udf_get_fi_ident(sfi), fileident, lfi); 79 } else if (offset >= 0) { 80 memcpy(fibh->ebh->b_data + offset, fileident, lfi); 81 } else { 82 memcpy(udf_get_fi_ident(sfi), fileident, -offset); 83 memcpy(fibh->ebh->b_data, fileident - offset, 84 lfi + offset); 85 } 86 } 87 88 offset += lfi; 89 90 if (adinicb || (offset + padlen < 0)) { 91 memset(udf_get_fi_ident(sfi) + lfi, 0x00, padlen); 92 } else if (offset >= 0) { 93 memset(fibh->ebh->b_data + offset, 0x00, padlen); 94 } else { 95 memset(udf_get_fi_ident(sfi) + lfi, 0x00, -offset); 96 memset(fibh->ebh->b_data, 0x00, padlen + offset); 97 } 98 99 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag), 100 sizeof(struct fileIdentDesc) - sizeof(struct tag)); 101 102 if (fibh->sbh == fibh->ebh) { 103 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 104 crclen + sizeof(struct tag) - 105 sizeof(struct fileIdentDesc)); 106 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { 107 crc = crc_itu_t(crc, fibh->ebh->b_data + 108 sizeof(struct fileIdentDesc) + 109 fibh->soffset, 110 crclen + sizeof(struct tag) - 111 sizeof(struct fileIdentDesc)); 112 } else { 113 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 114 -fibh->soffset - sizeof(struct fileIdentDesc)); 115 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); 116 } 117 118 cfi->descTag.descCRC = cpu_to_le16(crc); 119 cfi->descTag.descCRCLength = cpu_to_le16(crclen); 120 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); 121 122 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { 123 memcpy((uint8_t *)sfi, (uint8_t *)cfi, 124 sizeof(struct fileIdentDesc)); 125 } else { 126 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); 127 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, 128 sizeof(struct fileIdentDesc) + fibh->soffset); 129 } 130 131 if (adinicb) { 132 mark_inode_dirty(inode); 133 } else { 134 if (fibh->sbh != fibh->ebh) 135 mark_buffer_dirty_inode(fibh->ebh, inode); 136 mark_buffer_dirty_inode(fibh->sbh, inode); 137 } 138 inode_inc_iversion(inode); 139 140 return 0; 141 } 142 143 /** 144 * udf_find_entry - find entry in given directory. 145 * 146 * @dir: directory inode to search in 147 * @child: qstr of the name 148 * @fibh: buffer head / inode with file identifier descriptor we found 149 * @cfi: found file identifier descriptor with given name 150 * 151 * This function searches in the directory @dir for a file name @child. When 152 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB 153 * directories) containing the file identifier descriptor (FID). In that case 154 * the function returns pointer to the FID in the buffer or inode - but note 155 * that FID may be split among two buffers (blocks) so accessing it via that 156 * pointer isn't easily possible. This pointer can be used only as an iterator 157 * for other directory manipulation functions. For inspection of the FID @cfi 158 * can be used - the found FID is copied there. 159 * 160 * Returns pointer to FID, NULL when nothing found, or error code. 161 */ 162 static struct fileIdentDesc *udf_find_entry(struct inode *dir, 163 const struct qstr *child, 164 struct udf_fileident_bh *fibh, 165 struct fileIdentDesc *cfi) 166 { 167 struct fileIdentDesc *fi = NULL; 168 loff_t f_pos; 169 udf_pblk_t block; 170 int flen; 171 unsigned char *fname = NULL, *copy_name = NULL; 172 unsigned char *nameptr; 173 uint8_t lfi; 174 uint16_t liu; 175 loff_t size; 176 struct kernel_lb_addr eloc; 177 uint32_t elen; 178 sector_t offset; 179 struct extent_position epos = {}; 180 struct udf_inode_info *dinfo = UDF_I(dir); 181 int isdotdot = child->len == 2 && 182 child->name[0] == '.' && child->name[1] == '.'; 183 struct super_block *sb = dir->i_sb; 184 185 size = udf_ext0_offset(dir) + dir->i_size; 186 f_pos = udf_ext0_offset(dir); 187 188 fibh->sbh = fibh->ebh = NULL; 189 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); 190 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 191 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, 192 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 193 fi = ERR_PTR(-EIO); 194 goto out_err; 195 } 196 197 block = udf_get_lb_pblock(sb, &eloc, offset); 198 if ((++offset << sb->s_blocksize_bits) < elen) { 199 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 200 epos.offset -= sizeof(struct short_ad); 201 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 202 epos.offset -= sizeof(struct long_ad); 203 } else 204 offset = 0; 205 206 fibh->sbh = fibh->ebh = udf_tread(sb, block); 207 if (!fibh->sbh) { 208 fi = ERR_PTR(-EIO); 209 goto out_err; 210 } 211 } 212 213 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 214 if (!fname) { 215 fi = ERR_PTR(-ENOMEM); 216 goto out_err; 217 } 218 219 while (f_pos < size) { 220 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 221 &elen, &offset); 222 if (!fi) { 223 fi = ERR_PTR(-EIO); 224 goto out_err; 225 } 226 227 liu = le16_to_cpu(cfi->lengthOfImpUse); 228 lfi = cfi->lengthFileIdent; 229 230 if (fibh->sbh == fibh->ebh) { 231 nameptr = udf_get_fi_ident(fi); 232 } else { 233 int poffset; /* Unpaded ending offset */ 234 235 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + 236 liu + lfi; 237 238 if (poffset >= lfi) 239 nameptr = (uint8_t *)(fibh->ebh->b_data + 240 poffset - lfi); 241 else { 242 if (!copy_name) { 243 copy_name = kmalloc(UDF_NAME_LEN, 244 GFP_NOFS); 245 if (!copy_name) { 246 fi = ERR_PTR(-ENOMEM); 247 goto out_err; 248 } 249 } 250 nameptr = copy_name; 251 memcpy(nameptr, udf_get_fi_ident(fi), 252 lfi - poffset); 253 memcpy(nameptr + lfi - poffset, 254 fibh->ebh->b_data, poffset); 255 } 256 } 257 258 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 259 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 260 continue; 261 } 262 263 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { 264 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 265 continue; 266 } 267 268 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && 269 isdotdot) 270 goto out_ok; 271 272 if (!lfi) 273 continue; 274 275 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); 276 if (flen < 0) { 277 fi = ERR_PTR(flen); 278 goto out_err; 279 } 280 281 if (udf_match(flen, fname, child->len, child->name)) 282 goto out_ok; 283 } 284 285 fi = NULL; 286 out_err: 287 if (fibh->sbh != fibh->ebh) 288 brelse(fibh->ebh); 289 brelse(fibh->sbh); 290 out_ok: 291 brelse(epos.bh); 292 kfree(fname); 293 kfree(copy_name); 294 295 return fi; 296 } 297 298 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 299 unsigned int flags) 300 { 301 struct inode *inode = NULL; 302 struct fileIdentDesc cfi; 303 struct udf_fileident_bh fibh; 304 struct fileIdentDesc *fi; 305 306 if (dentry->d_name.len > UDF_NAME_LEN) 307 return ERR_PTR(-ENAMETOOLONG); 308 309 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 310 if (IS_ERR(fi)) 311 return ERR_CAST(fi); 312 313 if (fi) { 314 struct kernel_lb_addr loc; 315 316 if (fibh.sbh != fibh.ebh) 317 brelse(fibh.ebh); 318 brelse(fibh.sbh); 319 320 loc = lelb_to_cpu(cfi.icb.extLocation); 321 inode = udf_iget(dir->i_sb, &loc); 322 if (IS_ERR(inode)) 323 return ERR_CAST(inode); 324 } 325 326 return d_splice_alias(inode, dentry); 327 } 328 329 static struct fileIdentDesc *udf_add_entry(struct inode *dir, 330 struct dentry *dentry, 331 struct udf_fileident_bh *fibh, 332 struct fileIdentDesc *cfi, int *err) 333 { 334 struct super_block *sb = dir->i_sb; 335 struct fileIdentDesc *fi = NULL; 336 unsigned char *name = NULL; 337 int namelen; 338 loff_t f_pos; 339 loff_t size = udf_ext0_offset(dir) + dir->i_size; 340 int nfidlen; 341 udf_pblk_t block; 342 struct kernel_lb_addr eloc; 343 uint32_t elen = 0; 344 sector_t offset; 345 struct extent_position epos = {}; 346 struct udf_inode_info *dinfo; 347 348 fibh->sbh = fibh->ebh = NULL; 349 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 350 if (!name) { 351 *err = -ENOMEM; 352 goto out_err; 353 } 354 355 if (dentry) { 356 if (!dentry->d_name.len) { 357 *err = -EINVAL; 358 goto out_err; 359 } 360 namelen = udf_put_filename(sb, dentry->d_name.name, 361 dentry->d_name.len, 362 name, UDF_NAME_LEN_CS0); 363 if (!namelen) { 364 *err = -ENAMETOOLONG; 365 goto out_err; 366 } 367 } else { 368 namelen = 0; 369 } 370 371 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 372 373 f_pos = udf_ext0_offset(dir); 374 375 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 376 dinfo = UDF_I(dir); 377 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 378 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 379 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 380 block = udf_get_lb_pblock(dir->i_sb, 381 &dinfo->i_location, 0); 382 fibh->soffset = fibh->eoffset = sb->s_blocksize; 383 goto add; 384 } 385 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 386 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 387 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 388 epos.offset -= sizeof(struct short_ad); 389 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 390 epos.offset -= sizeof(struct long_ad); 391 } else 392 offset = 0; 393 394 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 395 if (!fibh->sbh) { 396 *err = -EIO; 397 goto out_err; 398 } 399 400 block = dinfo->i_location.logicalBlockNum; 401 } 402 403 while (f_pos < size) { 404 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 405 &elen, &offset); 406 407 if (!fi) { 408 *err = -EIO; 409 goto out_err; 410 } 411 412 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 413 if (udf_dir_entry_len(cfi) == nfidlen) { 414 cfi->descTag.tagSerialNum = cpu_to_le16(1); 415 cfi->fileVersionNum = cpu_to_le16(1); 416 cfi->fileCharacteristics = 0; 417 cfi->lengthFileIdent = namelen; 418 cfi->lengthOfImpUse = cpu_to_le16(0); 419 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 420 name)) 421 goto out_ok; 422 else { 423 *err = -EIO; 424 goto out_err; 425 } 426 } 427 } 428 } 429 430 add: 431 f_pos += nfidlen; 432 433 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 434 sb->s_blocksize - fibh->eoffset < nfidlen) { 435 brelse(epos.bh); 436 epos.bh = NULL; 437 fibh->soffset -= udf_ext0_offset(dir); 438 fibh->eoffset -= udf_ext0_offset(dir); 439 f_pos -= udf_ext0_offset(dir); 440 if (fibh->sbh != fibh->ebh) 441 brelse(fibh->ebh); 442 brelse(fibh->sbh); 443 fibh->sbh = fibh->ebh = 444 udf_expand_dir_adinicb(dir, &block, err); 445 if (!fibh->sbh) 446 goto out_err; 447 epos.block = dinfo->i_location; 448 epos.offset = udf_file_entry_alloc_offset(dir); 449 /* Load extent udf_expand_dir_adinicb() has created */ 450 udf_current_aext(dir, &epos, &eloc, &elen, 1); 451 } 452 453 /* Entry fits into current block? */ 454 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 455 fibh->soffset = fibh->eoffset; 456 fibh->eoffset += nfidlen; 457 if (fibh->sbh != fibh->ebh) { 458 brelse(fibh->sbh); 459 fibh->sbh = fibh->ebh; 460 } 461 462 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 463 block = dinfo->i_location.logicalBlockNum; 464 fi = (struct fileIdentDesc *) 465 (dinfo->i_data + fibh->soffset - 466 udf_ext0_offset(dir) + 467 dinfo->i_lenEAttr); 468 } else { 469 block = eloc.logicalBlockNum + 470 ((elen - 1) >> 471 dir->i_sb->s_blocksize_bits); 472 fi = (struct fileIdentDesc *) 473 (fibh->sbh->b_data + fibh->soffset); 474 } 475 } else { 476 /* Round up last extent in the file */ 477 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 478 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 479 epos.offset -= sizeof(struct short_ad); 480 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 481 epos.offset -= sizeof(struct long_ad); 482 udf_write_aext(dir, &epos, &eloc, elen, 1); 483 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize 484 - 1) & ~(sb->s_blocksize - 1); 485 486 fibh->soffset = fibh->eoffset - sb->s_blocksize; 487 fibh->eoffset += nfidlen - sb->s_blocksize; 488 if (fibh->sbh != fibh->ebh) { 489 brelse(fibh->sbh); 490 fibh->sbh = fibh->ebh; 491 } 492 493 block = eloc.logicalBlockNum + ((elen - 1) >> 494 dir->i_sb->s_blocksize_bits); 495 fibh->ebh = udf_bread(dir, 496 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 497 if (!fibh->ebh) 498 goto out_err; 499 /* Extents could have been merged, invalidate our position */ 500 brelse(epos.bh); 501 epos.bh = NULL; 502 epos.block = dinfo->i_location; 503 epos.offset = udf_file_entry_alloc_offset(dir); 504 505 if (!fibh->soffset) { 506 /* Find the freshly allocated block */ 507 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 508 (EXT_RECORDED_ALLOCATED >> 30)) 509 ; 510 block = eloc.logicalBlockNum + ((elen - 1) >> 511 dir->i_sb->s_blocksize_bits); 512 brelse(fibh->sbh); 513 fibh->sbh = fibh->ebh; 514 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 515 } else { 516 fi = (struct fileIdentDesc *) 517 (fibh->sbh->b_data + sb->s_blocksize + 518 fibh->soffset); 519 } 520 } 521 522 memset(cfi, 0, sizeof(struct fileIdentDesc)); 523 if (UDF_SB(sb)->s_udfrev >= 0x0200) 524 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 525 sizeof(struct tag)); 526 else 527 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 528 sizeof(struct tag)); 529 cfi->fileVersionNum = cpu_to_le16(1); 530 cfi->lengthFileIdent = namelen; 531 cfi->lengthOfImpUse = cpu_to_le16(0); 532 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 533 dir->i_size += nfidlen; 534 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 535 dinfo->i_lenAlloc += nfidlen; 536 else { 537 /* Find the last extent and truncate it to proper size */ 538 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 539 (EXT_RECORDED_ALLOCATED >> 30)) 540 ; 541 elen -= dinfo->i_lenExtents - dir->i_size; 542 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 543 epos.offset -= sizeof(struct short_ad); 544 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 545 epos.offset -= sizeof(struct long_ad); 546 udf_write_aext(dir, &epos, &eloc, elen, 1); 547 dinfo->i_lenExtents = dir->i_size; 548 } 549 550 mark_inode_dirty(dir); 551 goto out_ok; 552 } else { 553 *err = -EIO; 554 goto out_err; 555 } 556 557 out_err: 558 fi = NULL; 559 if (fibh->sbh != fibh->ebh) 560 brelse(fibh->ebh); 561 brelse(fibh->sbh); 562 out_ok: 563 brelse(epos.bh); 564 kfree(name); 565 return fi; 566 } 567 568 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 569 struct udf_fileident_bh *fibh, 570 struct fileIdentDesc *cfi) 571 { 572 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 573 574 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 575 memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); 576 577 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 578 } 579 580 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 581 { 582 struct udf_inode_info *iinfo = UDF_I(inode); 583 struct inode *dir = d_inode(dentry->d_parent); 584 struct udf_fileident_bh fibh; 585 struct fileIdentDesc cfi, *fi; 586 int err; 587 588 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 589 if (unlikely(!fi)) { 590 inode_dec_link_count(inode); 591 discard_new_inode(inode); 592 return err; 593 } 594 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 595 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 596 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 597 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 598 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 599 dir->i_ctime = dir->i_mtime = current_time(dir); 600 mark_inode_dirty(dir); 601 if (fibh.sbh != fibh.ebh) 602 brelse(fibh.ebh); 603 brelse(fibh.sbh); 604 d_instantiate_new(dentry, inode); 605 606 return 0; 607 } 608 609 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 610 struct dentry *dentry, umode_t mode, bool excl) 611 { 612 struct inode *inode = udf_new_inode(dir, mode); 613 614 if (IS_ERR(inode)) 615 return PTR_ERR(inode); 616 617 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 618 inode->i_data.a_ops = &udf_adinicb_aops; 619 else 620 inode->i_data.a_ops = &udf_aops; 621 inode->i_op = &udf_file_inode_operations; 622 inode->i_fop = &udf_file_operations; 623 mark_inode_dirty(inode); 624 625 return udf_add_nondir(dentry, inode); 626 } 627 628 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 629 struct dentry *dentry, umode_t mode) 630 { 631 struct inode *inode = udf_new_inode(dir, mode); 632 633 if (IS_ERR(inode)) 634 return PTR_ERR(inode); 635 636 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 637 inode->i_data.a_ops = &udf_adinicb_aops; 638 else 639 inode->i_data.a_ops = &udf_aops; 640 inode->i_op = &udf_file_inode_operations; 641 inode->i_fop = &udf_file_operations; 642 mark_inode_dirty(inode); 643 d_tmpfile(dentry, inode); 644 unlock_new_inode(inode); 645 return 0; 646 } 647 648 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 649 struct dentry *dentry, umode_t mode, dev_t rdev) 650 { 651 struct inode *inode; 652 653 if (!old_valid_dev(rdev)) 654 return -EINVAL; 655 656 inode = udf_new_inode(dir, mode); 657 if (IS_ERR(inode)) 658 return PTR_ERR(inode); 659 660 init_special_inode(inode, mode, rdev); 661 return udf_add_nondir(dentry, inode); 662 } 663 664 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 665 struct dentry *dentry, umode_t mode) 666 { 667 struct inode *inode; 668 struct udf_fileident_bh fibh; 669 struct fileIdentDesc cfi, *fi; 670 int err; 671 struct udf_inode_info *dinfo = UDF_I(dir); 672 struct udf_inode_info *iinfo; 673 674 inode = udf_new_inode(dir, S_IFDIR | mode); 675 if (IS_ERR(inode)) 676 return PTR_ERR(inode); 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 discard_new_inode(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 discard_new_inode(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 dir->i_ctime = dir->i_mtime = current_time(dir); 713 mark_inode_dirty(dir); 714 d_instantiate_new(dentry, inode); 715 if (fibh.sbh != fibh.ebh) 716 brelse(fibh.ebh); 717 brelse(fibh.sbh); 718 err = 0; 719 720 out: 721 return err; 722 } 723 724 static int empty_dir(struct inode *dir) 725 { 726 struct fileIdentDesc *fi, cfi; 727 struct udf_fileident_bh fibh; 728 loff_t f_pos; 729 loff_t size = udf_ext0_offset(dir) + dir->i_size; 730 udf_pblk_t block; 731 struct kernel_lb_addr eloc; 732 uint32_t elen; 733 sector_t offset; 734 struct extent_position epos = {}; 735 struct udf_inode_info *dinfo = UDF_I(dir); 736 737 f_pos = udf_ext0_offset(dir); 738 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 739 740 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 741 fibh.sbh = fibh.ebh = NULL; 742 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 743 &epos, &eloc, &elen, &offset) == 744 (EXT_RECORDED_ALLOCATED >> 30)) { 745 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 746 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 747 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 748 epos.offset -= sizeof(struct short_ad); 749 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 750 epos.offset -= sizeof(struct long_ad); 751 } else 752 offset = 0; 753 754 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 755 if (!fibh.sbh) { 756 brelse(epos.bh); 757 return 0; 758 } 759 } else { 760 brelse(epos.bh); 761 return 0; 762 } 763 764 while (f_pos < size) { 765 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 766 &elen, &offset); 767 if (!fi) { 768 if (fibh.sbh != fibh.ebh) 769 brelse(fibh.ebh); 770 brelse(fibh.sbh); 771 brelse(epos.bh); 772 return 0; 773 } 774 775 if (cfi.lengthFileIdent && 776 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 777 if (fibh.sbh != fibh.ebh) 778 brelse(fibh.ebh); 779 brelse(fibh.sbh); 780 brelse(epos.bh); 781 return 0; 782 } 783 } 784 785 if (fibh.sbh != fibh.ebh) 786 brelse(fibh.ebh); 787 brelse(fibh.sbh); 788 brelse(epos.bh); 789 790 return 1; 791 } 792 793 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 794 { 795 int retval; 796 struct inode *inode = d_inode(dentry); 797 struct udf_fileident_bh fibh; 798 struct fileIdentDesc *fi, cfi; 799 struct kernel_lb_addr tloc; 800 801 retval = -ENOENT; 802 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 803 if (IS_ERR_OR_NULL(fi)) { 804 if (fi) 805 retval = PTR_ERR(fi); 806 goto out; 807 } 808 809 retval = -EIO; 810 tloc = lelb_to_cpu(cfi.icb.extLocation); 811 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 812 goto end_rmdir; 813 retval = -ENOTEMPTY; 814 if (!empty_dir(inode)) 815 goto end_rmdir; 816 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 817 if (retval) 818 goto end_rmdir; 819 if (inode->i_nlink != 2) 820 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 821 inode->i_nlink); 822 clear_nlink(inode); 823 inode->i_size = 0; 824 inode_dec_link_count(dir); 825 inode->i_ctime = dir->i_ctime = dir->i_mtime = 826 current_time(inode); 827 mark_inode_dirty(dir); 828 829 end_rmdir: 830 if (fibh.sbh != fibh.ebh) 831 brelse(fibh.ebh); 832 brelse(fibh.sbh); 833 834 out: 835 return retval; 836 } 837 838 static int udf_unlink(struct inode *dir, struct dentry *dentry) 839 { 840 int retval; 841 struct inode *inode = d_inode(dentry); 842 struct udf_fileident_bh fibh; 843 struct fileIdentDesc *fi; 844 struct fileIdentDesc cfi; 845 struct kernel_lb_addr tloc; 846 847 retval = -ENOENT; 848 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 849 850 if (IS_ERR_OR_NULL(fi)) { 851 if (fi) 852 retval = PTR_ERR(fi); 853 goto out; 854 } 855 856 retval = -EIO; 857 tloc = lelb_to_cpu(cfi.icb.extLocation); 858 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 859 goto end_unlink; 860 861 if (!inode->i_nlink) { 862 udf_debug("Deleting nonexistent file (%lu), %u\n", 863 inode->i_ino, inode->i_nlink); 864 set_nlink(inode, 1); 865 } 866 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 867 if (retval) 868 goto end_unlink; 869 dir->i_ctime = dir->i_mtime = current_time(dir); 870 mark_inode_dirty(dir); 871 inode_dec_link_count(inode); 872 inode->i_ctime = dir->i_ctime; 873 retval = 0; 874 875 end_unlink: 876 if (fibh.sbh != fibh.ebh) 877 brelse(fibh.ebh); 878 brelse(fibh.sbh); 879 880 out: 881 return retval; 882 } 883 884 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 885 struct dentry *dentry, const char *symname) 886 { 887 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 888 struct pathComponent *pc; 889 const char *compstart; 890 struct extent_position epos = {}; 891 int eoffset, elen = 0; 892 uint8_t *ea; 893 int err; 894 udf_pblk_t block; 895 unsigned char *name = NULL; 896 int namelen; 897 struct udf_inode_info *iinfo; 898 struct super_block *sb = dir->i_sb; 899 900 if (IS_ERR(inode)) 901 return PTR_ERR(inode); 902 903 iinfo = UDF_I(inode); 904 down_write(&iinfo->i_data_sem); 905 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 906 if (!name) { 907 err = -ENOMEM; 908 goto out_no_entry; 909 } 910 911 inode->i_data.a_ops = &udf_symlink_aops; 912 inode->i_op = &udf_symlink_inode_operations; 913 inode_nohighmem(inode); 914 915 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 916 struct kernel_lb_addr eloc; 917 uint32_t bsize; 918 919 block = udf_new_block(sb, inode, 920 iinfo->i_location.partitionReferenceNum, 921 iinfo->i_location.logicalBlockNum, &err); 922 if (!block) 923 goto out_no_entry; 924 epos.block = iinfo->i_location; 925 epos.offset = udf_file_entry_alloc_offset(inode); 926 epos.bh = NULL; 927 eloc.logicalBlockNum = block; 928 eloc.partitionReferenceNum = 929 iinfo->i_location.partitionReferenceNum; 930 bsize = sb->s_blocksize; 931 iinfo->i_lenExtents = bsize; 932 udf_add_aext(inode, &epos, &eloc, bsize, 0); 933 brelse(epos.bh); 934 935 block = udf_get_pblock(sb, block, 936 iinfo->i_location.partitionReferenceNum, 937 0); 938 epos.bh = udf_tgetblk(sb, block); 939 if (unlikely(!epos.bh)) { 940 err = -ENOMEM; 941 goto out_no_entry; 942 } 943 lock_buffer(epos.bh); 944 memset(epos.bh->b_data, 0x00, bsize); 945 set_buffer_uptodate(epos.bh); 946 unlock_buffer(epos.bh); 947 mark_buffer_dirty_inode(epos.bh, inode); 948 ea = epos.bh->b_data + udf_ext0_offset(inode); 949 } else 950 ea = iinfo->i_data + iinfo->i_lenEAttr; 951 952 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 953 pc = (struct pathComponent *)ea; 954 955 if (*symname == '/') { 956 do { 957 symname++; 958 } while (*symname == '/'); 959 960 pc->componentType = 1; 961 pc->lengthComponentIdent = 0; 962 pc->componentFileVersionNum = 0; 963 elen += sizeof(struct pathComponent); 964 } 965 966 err = -ENAMETOOLONG; 967 968 while (*symname) { 969 if (elen + sizeof(struct pathComponent) > eoffset) 970 goto out_no_entry; 971 972 pc = (struct pathComponent *)(ea + elen); 973 974 compstart = symname; 975 976 do { 977 symname++; 978 } while (*symname && *symname != '/'); 979 980 pc->componentType = 5; 981 pc->lengthComponentIdent = 0; 982 pc->componentFileVersionNum = 0; 983 if (compstart[0] == '.') { 984 if ((symname - compstart) == 1) 985 pc->componentType = 4; 986 else if ((symname - compstart) == 2 && 987 compstart[1] == '.') 988 pc->componentType = 3; 989 } 990 991 if (pc->componentType == 5) { 992 namelen = udf_put_filename(sb, compstart, 993 symname - compstart, 994 name, UDF_NAME_LEN_CS0); 995 if (!namelen) 996 goto out_no_entry; 997 998 if (elen + sizeof(struct pathComponent) + namelen > 999 eoffset) 1000 goto out_no_entry; 1001 else 1002 pc->lengthComponentIdent = namelen; 1003 1004 memcpy(pc->componentIdent, name, namelen); 1005 } 1006 1007 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1008 1009 if (*symname) { 1010 do { 1011 symname++; 1012 } while (*symname == '/'); 1013 } 1014 } 1015 1016 brelse(epos.bh); 1017 inode->i_size = elen; 1018 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1019 iinfo->i_lenAlloc = inode->i_size; 1020 else 1021 udf_truncate_tail_extent(inode); 1022 mark_inode_dirty(inode); 1023 up_write(&iinfo->i_data_sem); 1024 1025 err = udf_add_nondir(dentry, inode); 1026 out: 1027 kfree(name); 1028 return err; 1029 1030 out_no_entry: 1031 up_write(&iinfo->i_data_sem); 1032 inode_dec_link_count(inode); 1033 discard_new_inode(inode); 1034 goto out; 1035 } 1036 1037 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1038 struct dentry *dentry) 1039 { 1040 struct inode *inode = d_inode(old_dentry); 1041 struct udf_fileident_bh fibh; 1042 struct fileIdentDesc cfi, *fi; 1043 int err; 1044 1045 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1046 if (!fi) { 1047 return err; 1048 } 1049 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1050 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1051 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1052 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1053 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1054 } 1055 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1056 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1057 mark_inode_dirty(dir); 1058 1059 if (fibh.sbh != fibh.ebh) 1060 brelse(fibh.ebh); 1061 brelse(fibh.sbh); 1062 inc_nlink(inode); 1063 inode->i_ctime = current_time(inode); 1064 mark_inode_dirty(inode); 1065 dir->i_ctime = dir->i_mtime = current_time(dir); 1066 mark_inode_dirty(dir); 1067 ihold(inode); 1068 d_instantiate(dentry, inode); 1069 1070 return 0; 1071 } 1072 1073 /* Anybody can rename anything with this: the permission checks are left to the 1074 * higher-level routines. 1075 */ 1076 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1077 struct dentry *old_dentry, struct inode *new_dir, 1078 struct dentry *new_dentry, unsigned int flags) 1079 { 1080 struct inode *old_inode = d_inode(old_dentry); 1081 struct inode *new_inode = d_inode(new_dentry); 1082 struct udf_fileident_bh ofibh, nfibh; 1083 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1084 struct fileIdentDesc ocfi, ncfi; 1085 struct buffer_head *dir_bh = NULL; 1086 int retval = -ENOENT; 1087 struct kernel_lb_addr tloc; 1088 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1089 1090 if (flags & ~RENAME_NOREPLACE) 1091 return -EINVAL; 1092 1093 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1094 if (IS_ERR(ofi)) { 1095 retval = PTR_ERR(ofi); 1096 goto end_rename; 1097 } 1098 1099 if (ofibh.sbh != ofibh.ebh) 1100 brelse(ofibh.ebh); 1101 1102 brelse(ofibh.sbh); 1103 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1104 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1105 != old_inode->i_ino) 1106 goto end_rename; 1107 1108 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1109 if (IS_ERR(nfi)) { 1110 retval = PTR_ERR(nfi); 1111 goto end_rename; 1112 } 1113 if (nfi && !new_inode) { 1114 if (nfibh.sbh != nfibh.ebh) 1115 brelse(nfibh.ebh); 1116 brelse(nfibh.sbh); 1117 nfi = NULL; 1118 } 1119 if (S_ISDIR(old_inode->i_mode)) { 1120 int offset = udf_ext0_offset(old_inode); 1121 1122 if (new_inode) { 1123 retval = -ENOTEMPTY; 1124 if (!empty_dir(new_inode)) 1125 goto end_rename; 1126 } 1127 retval = -EIO; 1128 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1129 dir_fi = udf_get_fileident( 1130 old_iinfo->i_data - 1131 (old_iinfo->i_efe ? 1132 sizeof(struct extendedFileEntry) : 1133 sizeof(struct fileEntry)), 1134 old_inode->i_sb->s_blocksize, &offset); 1135 } else { 1136 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1137 if (!dir_bh) 1138 goto end_rename; 1139 dir_fi = udf_get_fileident(dir_bh->b_data, 1140 old_inode->i_sb->s_blocksize, &offset); 1141 } 1142 if (!dir_fi) 1143 goto end_rename; 1144 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1145 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1146 old_dir->i_ino) 1147 goto end_rename; 1148 } 1149 if (!nfi) { 1150 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1151 &retval); 1152 if (!nfi) 1153 goto end_rename; 1154 } 1155 1156 /* 1157 * Like most other Unix systems, set the ctime for inodes on a 1158 * rename. 1159 */ 1160 old_inode->i_ctime = current_time(old_inode); 1161 mark_inode_dirty(old_inode); 1162 1163 /* 1164 * ok, that's it 1165 */ 1166 ncfi.fileVersionNum = ocfi.fileVersionNum; 1167 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1168 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1169 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1170 1171 /* The old fid may have moved - find it again */ 1172 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1173 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1174 1175 if (new_inode) { 1176 new_inode->i_ctime = current_time(new_inode); 1177 inode_dec_link_count(new_inode); 1178 } 1179 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1180 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1181 mark_inode_dirty(old_dir); 1182 mark_inode_dirty(new_dir); 1183 1184 if (dir_fi) { 1185 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1186 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1187 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1188 mark_inode_dirty(old_inode); 1189 else 1190 mark_buffer_dirty_inode(dir_bh, old_inode); 1191 1192 inode_dec_link_count(old_dir); 1193 if (new_inode) 1194 inode_dec_link_count(new_inode); 1195 else { 1196 inc_nlink(new_dir); 1197 mark_inode_dirty(new_dir); 1198 } 1199 } 1200 1201 if (ofi) { 1202 if (ofibh.sbh != ofibh.ebh) 1203 brelse(ofibh.ebh); 1204 brelse(ofibh.sbh); 1205 } 1206 1207 retval = 0; 1208 1209 end_rename: 1210 brelse(dir_bh); 1211 if (nfi) { 1212 if (nfibh.sbh != nfibh.ebh) 1213 brelse(nfibh.ebh); 1214 brelse(nfibh.sbh); 1215 } 1216 1217 return retval; 1218 } 1219 1220 static struct dentry *udf_get_parent(struct dentry *child) 1221 { 1222 struct kernel_lb_addr tloc; 1223 struct inode *inode = NULL; 1224 struct fileIdentDesc cfi; 1225 struct udf_fileident_bh fibh; 1226 1227 if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi)) 1228 return ERR_PTR(-EACCES); 1229 1230 if (fibh.sbh != fibh.ebh) 1231 brelse(fibh.ebh); 1232 brelse(fibh.sbh); 1233 1234 tloc = lelb_to_cpu(cfi.icb.extLocation); 1235 inode = udf_iget(child->d_sb, &tloc); 1236 if (IS_ERR(inode)) 1237 return ERR_CAST(inode); 1238 1239 return d_obtain_alias(inode); 1240 } 1241 1242 1243 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1244 u16 partref, __u32 generation) 1245 { 1246 struct inode *inode; 1247 struct kernel_lb_addr loc; 1248 1249 if (block == 0) 1250 return ERR_PTR(-ESTALE); 1251 1252 loc.logicalBlockNum = block; 1253 loc.partitionReferenceNum = partref; 1254 inode = udf_iget(sb, &loc); 1255 1256 if (IS_ERR(inode)) 1257 return ERR_CAST(inode); 1258 1259 if (generation && inode->i_generation != generation) { 1260 iput(inode); 1261 return ERR_PTR(-ESTALE); 1262 } 1263 return d_obtain_alias(inode); 1264 } 1265 1266 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1267 struct fid *fid, int fh_len, int fh_type) 1268 { 1269 if (fh_len < 3 || 1270 (fh_type != FILEID_UDF_WITH_PARENT && 1271 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1272 return NULL; 1273 1274 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1275 fid->udf.generation); 1276 } 1277 1278 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1279 struct fid *fid, int fh_len, int fh_type) 1280 { 1281 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1282 return NULL; 1283 1284 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1285 fid->udf.parent_partref, 1286 fid->udf.parent_generation); 1287 } 1288 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1289 struct inode *parent) 1290 { 1291 int len = *lenp; 1292 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1293 struct fid *fid = (struct fid *)fh; 1294 int type = FILEID_UDF_WITHOUT_PARENT; 1295 1296 if (parent && (len < 5)) { 1297 *lenp = 5; 1298 return FILEID_INVALID; 1299 } else if (len < 3) { 1300 *lenp = 3; 1301 return FILEID_INVALID; 1302 } 1303 1304 *lenp = 3; 1305 fid->udf.block = location.logicalBlockNum; 1306 fid->udf.partref = location.partitionReferenceNum; 1307 fid->udf.parent_partref = 0; 1308 fid->udf.generation = inode->i_generation; 1309 1310 if (parent) { 1311 location = UDF_I(parent)->i_location; 1312 fid->udf.parent_block = location.logicalBlockNum; 1313 fid->udf.parent_partref = location.partitionReferenceNum; 1314 fid->udf.parent_generation = inode->i_generation; 1315 *lenp = 5; 1316 type = FILEID_UDF_WITH_PARENT; 1317 } 1318 1319 return type; 1320 } 1321 1322 const struct export_operations udf_export_ops = { 1323 .encode_fh = udf_encode_fh, 1324 .fh_to_dentry = udf_fh_to_dentry, 1325 .fh_to_parent = udf_fh_to_parent, 1326 .get_parent = udf_get_parent, 1327 }; 1328 1329 const struct inode_operations udf_dir_inode_operations = { 1330 .lookup = udf_lookup, 1331 .create = udf_create, 1332 .link = udf_link, 1333 .unlink = udf_unlink, 1334 .symlink = udf_symlink, 1335 .mkdir = udf_mkdir, 1336 .rmdir = udf_rmdir, 1337 .mknod = udf_mknod, 1338 .rename = udf_rename, 1339 .tmpfile = udf_tmpfile, 1340 }; 1341