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 34 static inline int udf_match(int len1, const unsigned char *name1, int len2, 35 const unsigned char *name2) 36 { 37 if (len1 != len2) 38 return 0; 39 40 return !memcmp(name1, name2, len1); 41 } 42 43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi, 44 struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh, 45 uint8_t *impuse, uint8_t *fileident) 46 { 47 uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag); 48 uint16_t crc; 49 int offset; 50 uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse); 51 uint8_t lfi = cfi->lengthFileIdent; 52 int padlen = fibh->eoffset - fibh->soffset - liu - lfi - 53 sizeof(struct fileIdentDesc); 54 int adinicb = 0; 55 56 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 57 adinicb = 1; 58 59 offset = fibh->soffset + sizeof(struct fileIdentDesc); 60 61 if (impuse) { 62 if (adinicb || (offset + liu < 0)) { 63 memcpy((uint8_t *)sfi->impUse, impuse, liu); 64 } else if (offset >= 0) { 65 memcpy(fibh->ebh->b_data + offset, impuse, liu); 66 } else { 67 memcpy((uint8_t *)sfi->impUse, impuse, -offset); 68 memcpy(fibh->ebh->b_data, impuse - offset, 69 liu + offset); 70 } 71 } 72 73 offset += liu; 74 75 if (fileident) { 76 if (adinicb || (offset + lfi < 0)) { 77 memcpy(udf_get_fi_ident(sfi), fileident, lfi); 78 } else if (offset >= 0) { 79 memcpy(fibh->ebh->b_data + offset, fileident, lfi); 80 } else { 81 memcpy(udf_get_fi_ident(sfi), fileident, -offset); 82 memcpy(fibh->ebh->b_data, fileident - offset, 83 lfi + offset); 84 } 85 } 86 87 offset += lfi; 88 89 if (adinicb || (offset + padlen < 0)) { 90 memset(udf_get_fi_ident(sfi) + lfi, 0x00, padlen); 91 } else if (offset >= 0) { 92 memset(fibh->ebh->b_data + offset, 0x00, padlen); 93 } else { 94 memset(udf_get_fi_ident(sfi) + lfi, 0x00, -offset); 95 memset(fibh->ebh->b_data, 0x00, padlen + offset); 96 } 97 98 crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag), 99 sizeof(struct fileIdentDesc) - sizeof(struct tag)); 100 101 if (fibh->sbh == fibh->ebh) { 102 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 103 crclen + sizeof(struct tag) - 104 sizeof(struct fileIdentDesc)); 105 } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) { 106 crc = crc_itu_t(crc, fibh->ebh->b_data + 107 sizeof(struct fileIdentDesc) + 108 fibh->soffset, 109 crclen + sizeof(struct tag) - 110 sizeof(struct fileIdentDesc)); 111 } else { 112 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse, 113 -fibh->soffset - sizeof(struct fileIdentDesc)); 114 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset); 115 } 116 117 cfi->descTag.descCRC = cpu_to_le16(crc); 118 cfi->descTag.descCRCLength = cpu_to_le16(crclen); 119 cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag); 120 121 if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) { 122 memcpy((uint8_t *)sfi, (uint8_t *)cfi, 123 sizeof(struct fileIdentDesc)); 124 } else { 125 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset); 126 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset, 127 sizeof(struct fileIdentDesc) + fibh->soffset); 128 } 129 130 if (adinicb) { 131 mark_inode_dirty(inode); 132 } else { 133 if (fibh->sbh != fibh->ebh) 134 mark_buffer_dirty_inode(fibh->ebh, inode); 135 mark_buffer_dirty_inode(fibh->sbh, inode); 136 } 137 return 0; 138 } 139 140 /** 141 * udf_find_entry - find entry in given directory. 142 * 143 * @dir: directory inode to search in 144 * @child: qstr of the name 145 * @fibh: buffer head / inode with file identifier descriptor we found 146 * @cfi: found file identifier descriptor with given name 147 * 148 * This function searches in the directory @dir for a file name @child. When 149 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB 150 * directories) containing the file identifier descriptor (FID). In that case 151 * the function returns pointer to the FID in the buffer or inode - but note 152 * that FID may be split among two buffers (blocks) so accessing it via that 153 * pointer isn't easily possible. This pointer can be used only as an iterator 154 * for other directory manipulation functions. For inspection of the FID @cfi 155 * can be used - the found FID is copied there. 156 * 157 * Returns pointer to FID, NULL when nothing found, or error code. 158 */ 159 static struct fileIdentDesc *udf_find_entry(struct inode *dir, 160 const struct qstr *child, 161 struct udf_fileident_bh *fibh, 162 struct fileIdentDesc *cfi) 163 { 164 struct fileIdentDesc *fi = NULL; 165 loff_t f_pos; 166 udf_pblk_t block; 167 int flen; 168 unsigned char *fname = NULL, *copy_name = NULL; 169 unsigned char *nameptr; 170 uint8_t lfi; 171 uint16_t liu; 172 loff_t size; 173 struct kernel_lb_addr eloc; 174 uint32_t elen; 175 sector_t offset; 176 struct extent_position epos = {}; 177 struct udf_inode_info *dinfo = UDF_I(dir); 178 int isdotdot = child->len == 2 && 179 child->name[0] == '.' && child->name[1] == '.'; 180 struct super_block *sb = dir->i_sb; 181 182 size = udf_ext0_offset(dir) + dir->i_size; 183 f_pos = udf_ext0_offset(dir); 184 185 fibh->sbh = fibh->ebh = NULL; 186 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); 187 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 188 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, 189 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 190 fi = ERR_PTR(-EIO); 191 goto out_err; 192 } 193 194 block = udf_get_lb_pblock(sb, &eloc, offset); 195 if ((++offset << sb->s_blocksize_bits) < elen) { 196 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 197 epos.offset -= sizeof(struct short_ad); 198 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 199 epos.offset -= sizeof(struct long_ad); 200 } else 201 offset = 0; 202 203 fibh->sbh = fibh->ebh = udf_tread(sb, block); 204 if (!fibh->sbh) { 205 fi = ERR_PTR(-EIO); 206 goto out_err; 207 } 208 } 209 210 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 211 if (!fname) { 212 fi = ERR_PTR(-ENOMEM); 213 goto out_err; 214 } 215 216 while (f_pos < size) { 217 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 218 &elen, &offset); 219 if (!fi) { 220 fi = ERR_PTR(-EIO); 221 goto out_err; 222 } 223 224 liu = le16_to_cpu(cfi->lengthOfImpUse); 225 lfi = cfi->lengthFileIdent; 226 227 if (fibh->sbh == fibh->ebh) { 228 nameptr = udf_get_fi_ident(fi); 229 } else { 230 int poffset; /* Unpaded ending offset */ 231 232 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + 233 liu + lfi; 234 235 if (poffset >= lfi) 236 nameptr = (uint8_t *)(fibh->ebh->b_data + 237 poffset - lfi); 238 else { 239 if (!copy_name) { 240 copy_name = kmalloc(UDF_NAME_LEN, 241 GFP_NOFS); 242 if (!copy_name) { 243 fi = ERR_PTR(-ENOMEM); 244 goto out_err; 245 } 246 } 247 nameptr = copy_name; 248 memcpy(nameptr, udf_get_fi_ident(fi), 249 lfi - poffset); 250 memcpy(nameptr + lfi - poffset, 251 fibh->ebh->b_data, poffset); 252 } 253 } 254 255 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 256 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 257 continue; 258 } 259 260 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { 261 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 262 continue; 263 } 264 265 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && 266 isdotdot) 267 goto out_ok; 268 269 if (!lfi) 270 continue; 271 272 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); 273 if (flen < 0) { 274 fi = ERR_PTR(flen); 275 goto out_err; 276 } 277 278 if (udf_match(flen, fname, child->len, child->name)) 279 goto out_ok; 280 } 281 282 fi = NULL; 283 out_err: 284 if (fibh->sbh != fibh->ebh) 285 brelse(fibh->ebh); 286 brelse(fibh->sbh); 287 out_ok: 288 brelse(epos.bh); 289 kfree(fname); 290 kfree(copy_name); 291 292 return fi; 293 } 294 295 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 296 unsigned int flags) 297 { 298 struct inode *inode = NULL; 299 struct fileIdentDesc cfi; 300 struct udf_fileident_bh fibh; 301 struct fileIdentDesc *fi; 302 303 if (dentry->d_name.len > UDF_NAME_LEN) 304 return ERR_PTR(-ENAMETOOLONG); 305 306 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 307 if (IS_ERR(fi)) 308 return ERR_CAST(fi); 309 310 if (fi) { 311 struct kernel_lb_addr loc; 312 313 if (fibh.sbh != fibh.ebh) 314 brelse(fibh.ebh); 315 brelse(fibh.sbh); 316 317 loc = lelb_to_cpu(cfi.icb.extLocation); 318 inode = udf_iget(dir->i_sb, &loc); 319 if (IS_ERR(inode)) 320 return ERR_CAST(inode); 321 } 322 323 return d_splice_alias(inode, dentry); 324 } 325 326 static struct fileIdentDesc *udf_add_entry(struct inode *dir, 327 struct dentry *dentry, 328 struct udf_fileident_bh *fibh, 329 struct fileIdentDesc *cfi, int *err) 330 { 331 struct super_block *sb = dir->i_sb; 332 struct fileIdentDesc *fi = NULL; 333 unsigned char *name = NULL; 334 int namelen; 335 loff_t f_pos; 336 loff_t size = udf_ext0_offset(dir) + dir->i_size; 337 int nfidlen; 338 udf_pblk_t block; 339 struct kernel_lb_addr eloc; 340 uint32_t elen = 0; 341 sector_t offset; 342 struct extent_position epos = {}; 343 struct udf_inode_info *dinfo; 344 345 fibh->sbh = fibh->ebh = NULL; 346 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 347 if (!name) { 348 *err = -ENOMEM; 349 goto out_err; 350 } 351 352 if (dentry) { 353 if (!dentry->d_name.len) { 354 *err = -EINVAL; 355 goto out_err; 356 } 357 namelen = udf_put_filename(sb, dentry->d_name.name, 358 dentry->d_name.len, 359 name, UDF_NAME_LEN_CS0); 360 if (!namelen) { 361 *err = -ENAMETOOLONG; 362 goto out_err; 363 } 364 } else { 365 namelen = 0; 366 } 367 368 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 369 370 f_pos = udf_ext0_offset(dir); 371 372 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 373 dinfo = UDF_I(dir); 374 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 375 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 376 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 377 block = udf_get_lb_pblock(dir->i_sb, 378 &dinfo->i_location, 0); 379 fibh->soffset = fibh->eoffset = sb->s_blocksize; 380 goto add; 381 } 382 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 383 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 384 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 385 epos.offset -= sizeof(struct short_ad); 386 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 387 epos.offset -= sizeof(struct long_ad); 388 } else 389 offset = 0; 390 391 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 392 if (!fibh->sbh) { 393 *err = -EIO; 394 goto out_err; 395 } 396 397 block = dinfo->i_location.logicalBlockNum; 398 } 399 400 while (f_pos < size) { 401 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 402 &elen, &offset); 403 404 if (!fi) { 405 *err = -EIO; 406 goto out_err; 407 } 408 409 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 410 if (udf_dir_entry_len(cfi) == nfidlen) { 411 cfi->descTag.tagSerialNum = cpu_to_le16(1); 412 cfi->fileVersionNum = cpu_to_le16(1); 413 cfi->fileCharacteristics = 0; 414 cfi->lengthFileIdent = namelen; 415 cfi->lengthOfImpUse = cpu_to_le16(0); 416 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 417 name)) 418 goto out_ok; 419 else { 420 *err = -EIO; 421 goto out_err; 422 } 423 } 424 } 425 } 426 427 add: 428 f_pos += nfidlen; 429 430 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 431 sb->s_blocksize - fibh->eoffset < nfidlen) { 432 brelse(epos.bh); 433 epos.bh = NULL; 434 fibh->soffset -= udf_ext0_offset(dir); 435 fibh->eoffset -= udf_ext0_offset(dir); 436 f_pos -= udf_ext0_offset(dir); 437 if (fibh->sbh != fibh->ebh) 438 brelse(fibh->ebh); 439 brelse(fibh->sbh); 440 fibh->sbh = fibh->ebh = 441 udf_expand_dir_adinicb(dir, &block, err); 442 if (!fibh->sbh) 443 goto out_err; 444 epos.block = dinfo->i_location; 445 epos.offset = udf_file_entry_alloc_offset(dir); 446 /* Load extent udf_expand_dir_adinicb() has created */ 447 udf_current_aext(dir, &epos, &eloc, &elen, 1); 448 } 449 450 /* Entry fits into current block? */ 451 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 452 fibh->soffset = fibh->eoffset; 453 fibh->eoffset += nfidlen; 454 if (fibh->sbh != fibh->ebh) { 455 brelse(fibh->sbh); 456 fibh->sbh = fibh->ebh; 457 } 458 459 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 460 block = dinfo->i_location.logicalBlockNum; 461 fi = (struct fileIdentDesc *) 462 (dinfo->i_data + fibh->soffset - 463 udf_ext0_offset(dir) + 464 dinfo->i_lenEAttr); 465 } else { 466 block = eloc.logicalBlockNum + 467 ((elen - 1) >> 468 dir->i_sb->s_blocksize_bits); 469 fi = (struct fileIdentDesc *) 470 (fibh->sbh->b_data + fibh->soffset); 471 } 472 } else { 473 /* Round up last extent in the file */ 474 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 475 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 476 epos.offset -= sizeof(struct short_ad); 477 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 478 epos.offset -= sizeof(struct long_ad); 479 udf_write_aext(dir, &epos, &eloc, elen, 1); 480 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize 481 - 1) & ~(sb->s_blocksize - 1); 482 483 fibh->soffset = fibh->eoffset - sb->s_blocksize; 484 fibh->eoffset += nfidlen - sb->s_blocksize; 485 if (fibh->sbh != fibh->ebh) { 486 brelse(fibh->sbh); 487 fibh->sbh = fibh->ebh; 488 } 489 490 block = eloc.logicalBlockNum + ((elen - 1) >> 491 dir->i_sb->s_blocksize_bits); 492 fibh->ebh = udf_bread(dir, 493 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 494 if (!fibh->ebh) 495 goto out_err; 496 /* Extents could have been merged, invalidate our position */ 497 brelse(epos.bh); 498 epos.bh = NULL; 499 epos.block = dinfo->i_location; 500 epos.offset = udf_file_entry_alloc_offset(dir); 501 502 if (!fibh->soffset) { 503 /* Find the freshly allocated block */ 504 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 505 (EXT_RECORDED_ALLOCATED >> 30)) 506 ; 507 block = eloc.logicalBlockNum + ((elen - 1) >> 508 dir->i_sb->s_blocksize_bits); 509 brelse(fibh->sbh); 510 fibh->sbh = fibh->ebh; 511 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 512 } else { 513 fi = (struct fileIdentDesc *) 514 (fibh->sbh->b_data + sb->s_blocksize + 515 fibh->soffset); 516 } 517 } 518 519 memset(cfi, 0, sizeof(struct fileIdentDesc)); 520 if (UDF_SB(sb)->s_udfrev >= 0x0200) 521 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 522 sizeof(struct tag)); 523 else 524 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 525 sizeof(struct tag)); 526 cfi->fileVersionNum = cpu_to_le16(1); 527 cfi->lengthFileIdent = namelen; 528 cfi->lengthOfImpUse = cpu_to_le16(0); 529 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 530 dir->i_size += nfidlen; 531 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 532 dinfo->i_lenAlloc += nfidlen; 533 else { 534 /* Find the last extent and truncate it to proper size */ 535 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 536 (EXT_RECORDED_ALLOCATED >> 30)) 537 ; 538 elen -= dinfo->i_lenExtents - dir->i_size; 539 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 540 epos.offset -= sizeof(struct short_ad); 541 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 542 epos.offset -= sizeof(struct long_ad); 543 udf_write_aext(dir, &epos, &eloc, elen, 1); 544 dinfo->i_lenExtents = dir->i_size; 545 } 546 547 mark_inode_dirty(dir); 548 goto out_ok; 549 } else { 550 *err = -EIO; 551 goto out_err; 552 } 553 554 out_err: 555 fi = NULL; 556 if (fibh->sbh != fibh->ebh) 557 brelse(fibh->ebh); 558 brelse(fibh->sbh); 559 out_ok: 560 brelse(epos.bh); 561 kfree(name); 562 return fi; 563 } 564 565 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 566 struct udf_fileident_bh *fibh, 567 struct fileIdentDesc *cfi) 568 { 569 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 570 571 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 572 memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); 573 574 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 575 } 576 577 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 578 { 579 struct udf_inode_info *iinfo = UDF_I(inode); 580 struct inode *dir = d_inode(dentry->d_parent); 581 struct udf_fileident_bh fibh; 582 struct fileIdentDesc cfi, *fi; 583 int err; 584 585 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 586 if (unlikely(!fi)) { 587 inode_dec_link_count(inode); 588 discard_new_inode(inode); 589 return err; 590 } 591 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 592 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 593 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 594 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 595 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 596 dir->i_ctime = dir->i_mtime = current_time(dir); 597 mark_inode_dirty(dir); 598 if (fibh.sbh != fibh.ebh) 599 brelse(fibh.ebh); 600 brelse(fibh.sbh); 601 d_instantiate_new(dentry, inode); 602 603 return 0; 604 } 605 606 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 607 struct dentry *dentry, umode_t mode, bool excl) 608 { 609 struct inode *inode = udf_new_inode(dir, mode); 610 611 if (IS_ERR(inode)) 612 return PTR_ERR(inode); 613 614 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 615 inode->i_data.a_ops = &udf_adinicb_aops; 616 else 617 inode->i_data.a_ops = &udf_aops; 618 inode->i_op = &udf_file_inode_operations; 619 inode->i_fop = &udf_file_operations; 620 mark_inode_dirty(inode); 621 622 return udf_add_nondir(dentry, inode); 623 } 624 625 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 626 struct dentry *dentry, umode_t mode) 627 { 628 struct inode *inode = udf_new_inode(dir, mode); 629 630 if (IS_ERR(inode)) 631 return PTR_ERR(inode); 632 633 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 634 inode->i_data.a_ops = &udf_adinicb_aops; 635 else 636 inode->i_data.a_ops = &udf_aops; 637 inode->i_op = &udf_file_inode_operations; 638 inode->i_fop = &udf_file_operations; 639 mark_inode_dirty(inode); 640 d_tmpfile(dentry, inode); 641 unlock_new_inode(inode); 642 return 0; 643 } 644 645 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 646 struct dentry *dentry, umode_t mode, dev_t rdev) 647 { 648 struct inode *inode; 649 650 if (!old_valid_dev(rdev)) 651 return -EINVAL; 652 653 inode = udf_new_inode(dir, mode); 654 if (IS_ERR(inode)) 655 return PTR_ERR(inode); 656 657 init_special_inode(inode, mode, rdev); 658 return udf_add_nondir(dentry, inode); 659 } 660 661 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 662 struct dentry *dentry, umode_t mode) 663 { 664 struct inode *inode; 665 struct udf_fileident_bh fibh; 666 struct fileIdentDesc cfi, *fi; 667 int err; 668 struct udf_inode_info *dinfo = UDF_I(dir); 669 struct udf_inode_info *iinfo; 670 671 inode = udf_new_inode(dir, S_IFDIR | mode); 672 if (IS_ERR(inode)) 673 return PTR_ERR(inode); 674 675 iinfo = UDF_I(inode); 676 inode->i_op = &udf_dir_inode_operations; 677 inode->i_fop = &udf_dir_operations; 678 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 679 if (!fi) { 680 inode_dec_link_count(inode); 681 discard_new_inode(inode); 682 goto out; 683 } 684 set_nlink(inode, 2); 685 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 686 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 687 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 688 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 689 cfi.fileCharacteristics = 690 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 691 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 692 brelse(fibh.sbh); 693 mark_inode_dirty(inode); 694 695 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 696 if (!fi) { 697 clear_nlink(inode); 698 mark_inode_dirty(inode); 699 discard_new_inode(inode); 700 goto out; 701 } 702 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 703 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 704 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 705 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 706 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 707 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 708 inc_nlink(dir); 709 dir->i_ctime = dir->i_mtime = current_time(dir); 710 mark_inode_dirty(dir); 711 d_instantiate_new(dentry, inode); 712 if (fibh.sbh != fibh.ebh) 713 brelse(fibh.ebh); 714 brelse(fibh.sbh); 715 err = 0; 716 717 out: 718 return err; 719 } 720 721 static int empty_dir(struct inode *dir) 722 { 723 struct fileIdentDesc *fi, cfi; 724 struct udf_fileident_bh fibh; 725 loff_t f_pos; 726 loff_t size = udf_ext0_offset(dir) + dir->i_size; 727 udf_pblk_t block; 728 struct kernel_lb_addr eloc; 729 uint32_t elen; 730 sector_t offset; 731 struct extent_position epos = {}; 732 struct udf_inode_info *dinfo = UDF_I(dir); 733 734 f_pos = udf_ext0_offset(dir); 735 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 736 737 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 738 fibh.sbh = fibh.ebh = NULL; 739 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 740 &epos, &eloc, &elen, &offset) == 741 (EXT_RECORDED_ALLOCATED >> 30)) { 742 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 743 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 744 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 745 epos.offset -= sizeof(struct short_ad); 746 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 747 epos.offset -= sizeof(struct long_ad); 748 } else 749 offset = 0; 750 751 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 752 if (!fibh.sbh) { 753 brelse(epos.bh); 754 return 0; 755 } 756 } else { 757 brelse(epos.bh); 758 return 0; 759 } 760 761 while (f_pos < size) { 762 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 763 &elen, &offset); 764 if (!fi) { 765 if (fibh.sbh != fibh.ebh) 766 brelse(fibh.ebh); 767 brelse(fibh.sbh); 768 brelse(epos.bh); 769 return 0; 770 } 771 772 if (cfi.lengthFileIdent && 773 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 774 if (fibh.sbh != fibh.ebh) 775 brelse(fibh.ebh); 776 brelse(fibh.sbh); 777 brelse(epos.bh); 778 return 0; 779 } 780 } 781 782 if (fibh.sbh != fibh.ebh) 783 brelse(fibh.ebh); 784 brelse(fibh.sbh); 785 brelse(epos.bh); 786 787 return 1; 788 } 789 790 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 791 { 792 int retval; 793 struct inode *inode = d_inode(dentry); 794 struct udf_fileident_bh fibh; 795 struct fileIdentDesc *fi, cfi; 796 struct kernel_lb_addr tloc; 797 798 retval = -ENOENT; 799 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 800 if (IS_ERR_OR_NULL(fi)) { 801 if (fi) 802 retval = PTR_ERR(fi); 803 goto out; 804 } 805 806 retval = -EIO; 807 tloc = lelb_to_cpu(cfi.icb.extLocation); 808 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 809 goto end_rmdir; 810 retval = -ENOTEMPTY; 811 if (!empty_dir(inode)) 812 goto end_rmdir; 813 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 814 if (retval) 815 goto end_rmdir; 816 if (inode->i_nlink != 2) 817 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 818 inode->i_nlink); 819 clear_nlink(inode); 820 inode->i_size = 0; 821 inode_dec_link_count(dir); 822 inode->i_ctime = dir->i_ctime = dir->i_mtime = 823 current_time(inode); 824 mark_inode_dirty(dir); 825 826 end_rmdir: 827 if (fibh.sbh != fibh.ebh) 828 brelse(fibh.ebh); 829 brelse(fibh.sbh); 830 831 out: 832 return retval; 833 } 834 835 static int udf_unlink(struct inode *dir, struct dentry *dentry) 836 { 837 int retval; 838 struct inode *inode = d_inode(dentry); 839 struct udf_fileident_bh fibh; 840 struct fileIdentDesc *fi; 841 struct fileIdentDesc cfi; 842 struct kernel_lb_addr tloc; 843 844 retval = -ENOENT; 845 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 846 847 if (IS_ERR_OR_NULL(fi)) { 848 if (fi) 849 retval = PTR_ERR(fi); 850 goto out; 851 } 852 853 retval = -EIO; 854 tloc = lelb_to_cpu(cfi.icb.extLocation); 855 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 856 goto end_unlink; 857 858 if (!inode->i_nlink) { 859 udf_debug("Deleting nonexistent file (%lu), %u\n", 860 inode->i_ino, inode->i_nlink); 861 set_nlink(inode, 1); 862 } 863 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 864 if (retval) 865 goto end_unlink; 866 dir->i_ctime = dir->i_mtime = current_time(dir); 867 mark_inode_dirty(dir); 868 inode_dec_link_count(inode); 869 inode->i_ctime = dir->i_ctime; 870 retval = 0; 871 872 end_unlink: 873 if (fibh.sbh != fibh.ebh) 874 brelse(fibh.ebh); 875 brelse(fibh.sbh); 876 877 out: 878 return retval; 879 } 880 881 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 882 struct dentry *dentry, const char *symname) 883 { 884 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 885 struct pathComponent *pc; 886 const char *compstart; 887 struct extent_position epos = {}; 888 int eoffset, elen = 0; 889 uint8_t *ea; 890 int err; 891 udf_pblk_t block; 892 unsigned char *name = NULL; 893 int namelen; 894 struct udf_inode_info *iinfo; 895 struct super_block *sb = dir->i_sb; 896 897 if (IS_ERR(inode)) 898 return PTR_ERR(inode); 899 900 iinfo = UDF_I(inode); 901 down_write(&iinfo->i_data_sem); 902 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 903 if (!name) { 904 err = -ENOMEM; 905 goto out_no_entry; 906 } 907 908 inode->i_data.a_ops = &udf_symlink_aops; 909 inode->i_op = &udf_symlink_inode_operations; 910 inode_nohighmem(inode); 911 912 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 913 struct kernel_lb_addr eloc; 914 uint32_t bsize; 915 916 block = udf_new_block(sb, inode, 917 iinfo->i_location.partitionReferenceNum, 918 iinfo->i_location.logicalBlockNum, &err); 919 if (!block) 920 goto out_no_entry; 921 epos.block = iinfo->i_location; 922 epos.offset = udf_file_entry_alloc_offset(inode); 923 epos.bh = NULL; 924 eloc.logicalBlockNum = block; 925 eloc.partitionReferenceNum = 926 iinfo->i_location.partitionReferenceNum; 927 bsize = sb->s_blocksize; 928 iinfo->i_lenExtents = bsize; 929 udf_add_aext(inode, &epos, &eloc, bsize, 0); 930 brelse(epos.bh); 931 932 block = udf_get_pblock(sb, block, 933 iinfo->i_location.partitionReferenceNum, 934 0); 935 epos.bh = udf_tgetblk(sb, block); 936 if (unlikely(!epos.bh)) { 937 err = -ENOMEM; 938 goto out_no_entry; 939 } 940 lock_buffer(epos.bh); 941 memset(epos.bh->b_data, 0x00, bsize); 942 set_buffer_uptodate(epos.bh); 943 unlock_buffer(epos.bh); 944 mark_buffer_dirty_inode(epos.bh, inode); 945 ea = epos.bh->b_data + udf_ext0_offset(inode); 946 } else 947 ea = iinfo->i_data + iinfo->i_lenEAttr; 948 949 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 950 pc = (struct pathComponent *)ea; 951 952 if (*symname == '/') { 953 do { 954 symname++; 955 } while (*symname == '/'); 956 957 pc->componentType = 1; 958 pc->lengthComponentIdent = 0; 959 pc->componentFileVersionNum = 0; 960 elen += sizeof(struct pathComponent); 961 } 962 963 err = -ENAMETOOLONG; 964 965 while (*symname) { 966 if (elen + sizeof(struct pathComponent) > eoffset) 967 goto out_no_entry; 968 969 pc = (struct pathComponent *)(ea + elen); 970 971 compstart = symname; 972 973 do { 974 symname++; 975 } while (*symname && *symname != '/'); 976 977 pc->componentType = 5; 978 pc->lengthComponentIdent = 0; 979 pc->componentFileVersionNum = 0; 980 if (compstart[0] == '.') { 981 if ((symname - compstart) == 1) 982 pc->componentType = 4; 983 else if ((symname - compstart) == 2 && 984 compstart[1] == '.') 985 pc->componentType = 3; 986 } 987 988 if (pc->componentType == 5) { 989 namelen = udf_put_filename(sb, compstart, 990 symname - compstart, 991 name, UDF_NAME_LEN_CS0); 992 if (!namelen) 993 goto out_no_entry; 994 995 if (elen + sizeof(struct pathComponent) + namelen > 996 eoffset) 997 goto out_no_entry; 998 else 999 pc->lengthComponentIdent = namelen; 1000 1001 memcpy(pc->componentIdent, name, namelen); 1002 } 1003 1004 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1005 1006 if (*symname) { 1007 do { 1008 symname++; 1009 } while (*symname == '/'); 1010 } 1011 } 1012 1013 brelse(epos.bh); 1014 inode->i_size = elen; 1015 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1016 iinfo->i_lenAlloc = inode->i_size; 1017 else 1018 udf_truncate_tail_extent(inode); 1019 mark_inode_dirty(inode); 1020 up_write(&iinfo->i_data_sem); 1021 1022 err = udf_add_nondir(dentry, inode); 1023 out: 1024 kfree(name); 1025 return err; 1026 1027 out_no_entry: 1028 up_write(&iinfo->i_data_sem); 1029 inode_dec_link_count(inode); 1030 discard_new_inode(inode); 1031 goto out; 1032 } 1033 1034 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1035 struct dentry *dentry) 1036 { 1037 struct inode *inode = d_inode(old_dentry); 1038 struct udf_fileident_bh fibh; 1039 struct fileIdentDesc cfi, *fi; 1040 int err; 1041 1042 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1043 if (!fi) { 1044 return err; 1045 } 1046 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1047 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1048 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1049 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1050 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1051 } 1052 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1053 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1054 mark_inode_dirty(dir); 1055 1056 if (fibh.sbh != fibh.ebh) 1057 brelse(fibh.ebh); 1058 brelse(fibh.sbh); 1059 inc_nlink(inode); 1060 inode->i_ctime = current_time(inode); 1061 mark_inode_dirty(inode); 1062 dir->i_ctime = dir->i_mtime = current_time(dir); 1063 mark_inode_dirty(dir); 1064 ihold(inode); 1065 d_instantiate(dentry, inode); 1066 1067 return 0; 1068 } 1069 1070 /* Anybody can rename anything with this: the permission checks are left to the 1071 * higher-level routines. 1072 */ 1073 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1074 struct dentry *old_dentry, struct inode *new_dir, 1075 struct dentry *new_dentry, unsigned int flags) 1076 { 1077 struct inode *old_inode = d_inode(old_dentry); 1078 struct inode *new_inode = d_inode(new_dentry); 1079 struct udf_fileident_bh ofibh, nfibh; 1080 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1081 struct fileIdentDesc ocfi, ncfi; 1082 struct buffer_head *dir_bh = NULL; 1083 int retval = -ENOENT; 1084 struct kernel_lb_addr tloc; 1085 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1086 1087 if (flags & ~RENAME_NOREPLACE) 1088 return -EINVAL; 1089 1090 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1091 if (IS_ERR(ofi)) { 1092 retval = PTR_ERR(ofi); 1093 goto end_rename; 1094 } 1095 1096 if (ofibh.sbh != ofibh.ebh) 1097 brelse(ofibh.ebh); 1098 1099 brelse(ofibh.sbh); 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 (IS_ERR(nfi)) { 1107 retval = PTR_ERR(nfi); 1108 goto end_rename; 1109 } 1110 if (nfi && !new_inode) { 1111 if (nfibh.sbh != nfibh.ebh) 1112 brelse(nfibh.ebh); 1113 brelse(nfibh.sbh); 1114 nfi = NULL; 1115 } 1116 if (S_ISDIR(old_inode->i_mode)) { 1117 int offset = udf_ext0_offset(old_inode); 1118 1119 if (new_inode) { 1120 retval = -ENOTEMPTY; 1121 if (!empty_dir(new_inode)) 1122 goto end_rename; 1123 } 1124 retval = -EIO; 1125 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1126 dir_fi = udf_get_fileident( 1127 old_iinfo->i_data - 1128 (old_iinfo->i_efe ? 1129 sizeof(struct extendedFileEntry) : 1130 sizeof(struct fileEntry)), 1131 old_inode->i_sb->s_blocksize, &offset); 1132 } else { 1133 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1134 if (!dir_bh) 1135 goto end_rename; 1136 dir_fi = udf_get_fileident(dir_bh->b_data, 1137 old_inode->i_sb->s_blocksize, &offset); 1138 } 1139 if (!dir_fi) 1140 goto end_rename; 1141 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1142 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1143 old_dir->i_ino) 1144 goto end_rename; 1145 } 1146 if (!nfi) { 1147 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1148 &retval); 1149 if (!nfi) 1150 goto end_rename; 1151 } 1152 1153 /* 1154 * Like most other Unix systems, set the ctime for inodes on a 1155 * rename. 1156 */ 1157 old_inode->i_ctime = current_time(old_inode); 1158 mark_inode_dirty(old_inode); 1159 1160 /* 1161 * ok, that's it 1162 */ 1163 ncfi.fileVersionNum = ocfi.fileVersionNum; 1164 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1165 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1166 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1167 1168 /* The old fid may have moved - find it again */ 1169 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1170 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1171 1172 if (new_inode) { 1173 new_inode->i_ctime = current_time(new_inode); 1174 inode_dec_link_count(new_inode); 1175 } 1176 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1177 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1178 mark_inode_dirty(old_dir); 1179 mark_inode_dirty(new_dir); 1180 1181 if (dir_fi) { 1182 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1183 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1184 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1185 mark_inode_dirty(old_inode); 1186 else 1187 mark_buffer_dirty_inode(dir_bh, old_inode); 1188 1189 inode_dec_link_count(old_dir); 1190 if (new_inode) 1191 inode_dec_link_count(new_inode); 1192 else { 1193 inc_nlink(new_dir); 1194 mark_inode_dirty(new_dir); 1195 } 1196 } 1197 1198 if (ofi) { 1199 if (ofibh.sbh != ofibh.ebh) 1200 brelse(ofibh.ebh); 1201 brelse(ofibh.sbh); 1202 } 1203 1204 retval = 0; 1205 1206 end_rename: 1207 brelse(dir_bh); 1208 if (nfi) { 1209 if (nfibh.sbh != nfibh.ebh) 1210 brelse(nfibh.ebh); 1211 brelse(nfibh.sbh); 1212 } 1213 1214 return retval; 1215 } 1216 1217 static struct dentry *udf_get_parent(struct dentry *child) 1218 { 1219 struct kernel_lb_addr tloc; 1220 struct inode *inode = NULL; 1221 struct fileIdentDesc cfi; 1222 struct udf_fileident_bh fibh; 1223 1224 if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi)) 1225 return ERR_PTR(-EACCES); 1226 1227 if (fibh.sbh != fibh.ebh) 1228 brelse(fibh.ebh); 1229 brelse(fibh.sbh); 1230 1231 tloc = lelb_to_cpu(cfi.icb.extLocation); 1232 inode = udf_iget(child->d_sb, &tloc); 1233 if (IS_ERR(inode)) 1234 return ERR_CAST(inode); 1235 1236 return d_obtain_alias(inode); 1237 } 1238 1239 1240 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1241 u16 partref, __u32 generation) 1242 { 1243 struct inode *inode; 1244 struct kernel_lb_addr loc; 1245 1246 if (block == 0) 1247 return ERR_PTR(-ESTALE); 1248 1249 loc.logicalBlockNum = block; 1250 loc.partitionReferenceNum = partref; 1251 inode = udf_iget(sb, &loc); 1252 1253 if (IS_ERR(inode)) 1254 return ERR_CAST(inode); 1255 1256 if (generation && inode->i_generation != generation) { 1257 iput(inode); 1258 return ERR_PTR(-ESTALE); 1259 } 1260 return d_obtain_alias(inode); 1261 } 1262 1263 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1264 struct fid *fid, int fh_len, int fh_type) 1265 { 1266 if (fh_len < 3 || 1267 (fh_type != FILEID_UDF_WITH_PARENT && 1268 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1269 return NULL; 1270 1271 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1272 fid->udf.generation); 1273 } 1274 1275 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1276 struct fid *fid, int fh_len, int fh_type) 1277 { 1278 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1279 return NULL; 1280 1281 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1282 fid->udf.parent_partref, 1283 fid->udf.parent_generation); 1284 } 1285 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1286 struct inode *parent) 1287 { 1288 int len = *lenp; 1289 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1290 struct fid *fid = (struct fid *)fh; 1291 int type = FILEID_UDF_WITHOUT_PARENT; 1292 1293 if (parent && (len < 5)) { 1294 *lenp = 5; 1295 return FILEID_INVALID; 1296 } else if (len < 3) { 1297 *lenp = 3; 1298 return FILEID_INVALID; 1299 } 1300 1301 *lenp = 3; 1302 fid->udf.block = location.logicalBlockNum; 1303 fid->udf.partref = location.partitionReferenceNum; 1304 fid->udf.parent_partref = 0; 1305 fid->udf.generation = inode->i_generation; 1306 1307 if (parent) { 1308 location = UDF_I(parent)->i_location; 1309 fid->udf.parent_block = location.logicalBlockNum; 1310 fid->udf.parent_partref = location.partitionReferenceNum; 1311 fid->udf.parent_generation = inode->i_generation; 1312 *lenp = 5; 1313 type = FILEID_UDF_WITH_PARENT; 1314 } 1315 1316 return type; 1317 } 1318 1319 const struct export_operations udf_export_ops = { 1320 .encode_fh = udf_encode_fh, 1321 .fh_to_dentry = udf_fh_to_dentry, 1322 .fh_to_parent = udf_fh_to_parent, 1323 .get_parent = udf_get_parent, 1324 }; 1325 1326 const struct inode_operations udf_dir_inode_operations = { 1327 .lookup = udf_lookup, 1328 .create = udf_create, 1329 .link = udf_link, 1330 .unlink = udf_unlink, 1331 .symlink = udf_symlink, 1332 .mkdir = udf_mkdir, 1333 .rmdir = udf_rmdir, 1334 .mknod = udf_mknod, 1335 .rename = udf_rename, 1336 .tmpfile = udf_tmpfile, 1337 }; 1338