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((uint8_t *)sfi->fileIdent + liu, fileident, lfi); 78 } else if (offset >= 0) { 79 memcpy(fibh->ebh->b_data + offset, fileident, lfi); 80 } else { 81 memcpy((uint8_t *)sfi->fileIdent + liu, fileident, 82 -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((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen); 92 } else if (offset >= 0) { 93 memset(fibh->ebh->b_data + offset, 0x00, padlen); 94 } else { 95 memset((uint8_t *)sfi->padding + liu + 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 return 0; 139 } 140 141 /** 142 * udf_find_entry - find entry in given directory. 143 * 144 * @dir: directory inode to search in 145 * @child: qstr of the name 146 * @fibh: buffer head / inode with file identifier descriptor we found 147 * @cfi: found file identifier descriptor with given name 148 * 149 * This function searches in the directory @dir for a file name @child. When 150 * found, @fibh points to the buffer head(s) (bh is NULL for in ICB 151 * directories) containing the file identifier descriptor (FID). In that case 152 * the function returns pointer to the FID in the buffer or inode - but note 153 * that FID may be split among two buffers (blocks) so accessing it via that 154 * pointer isn't easily possible. This pointer can be used only as an iterator 155 * for other directory manipulation functions. For inspection of the FID @cfi 156 * can be used - the found FID is copied there. 157 * 158 * Returns pointer to FID, NULL when nothing found, or error code. 159 */ 160 static struct fileIdentDesc *udf_find_entry(struct inode *dir, 161 const struct qstr *child, 162 struct udf_fileident_bh *fibh, 163 struct fileIdentDesc *cfi) 164 { 165 struct fileIdentDesc *fi = NULL; 166 loff_t f_pos; 167 udf_pblk_t block; 168 int flen; 169 unsigned char *fname = NULL, *copy_name = NULL; 170 unsigned char *nameptr; 171 uint8_t lfi; 172 uint16_t liu; 173 loff_t size; 174 struct kernel_lb_addr eloc; 175 uint32_t elen; 176 sector_t offset; 177 struct extent_position epos = {}; 178 struct udf_inode_info *dinfo = UDF_I(dir); 179 int isdotdot = child->len == 2 && 180 child->name[0] == '.' && child->name[1] == '.'; 181 struct super_block *sb = dir->i_sb; 182 183 size = udf_ext0_offset(dir) + dir->i_size; 184 f_pos = udf_ext0_offset(dir); 185 186 fibh->sbh = fibh->ebh = NULL; 187 fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1); 188 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 189 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos, 190 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 191 fi = ERR_PTR(-EIO); 192 goto out_err; 193 } 194 195 block = udf_get_lb_pblock(sb, &eloc, offset); 196 if ((++offset << sb->s_blocksize_bits) < elen) { 197 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 198 epos.offset -= sizeof(struct short_ad); 199 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 200 epos.offset -= sizeof(struct long_ad); 201 } else 202 offset = 0; 203 204 fibh->sbh = fibh->ebh = udf_tread(sb, block); 205 if (!fibh->sbh) { 206 fi = ERR_PTR(-EIO); 207 goto out_err; 208 } 209 } 210 211 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); 212 if (!fname) { 213 fi = ERR_PTR(-ENOMEM); 214 goto out_err; 215 } 216 217 while (f_pos < size) { 218 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 219 &elen, &offset); 220 if (!fi) { 221 fi = ERR_PTR(-EIO); 222 goto out_err; 223 } 224 225 liu = le16_to_cpu(cfi->lengthOfImpUse); 226 lfi = cfi->lengthFileIdent; 227 228 if (fibh->sbh == fibh->ebh) { 229 nameptr = fi->fileIdent + liu; 230 } else { 231 int poffset; /* Unpaded ending offset */ 232 233 poffset = fibh->soffset + sizeof(struct fileIdentDesc) + 234 liu + lfi; 235 236 if (poffset >= lfi) 237 nameptr = (uint8_t *)(fibh->ebh->b_data + 238 poffset - lfi); 239 else { 240 if (!copy_name) { 241 copy_name = kmalloc(UDF_NAME_LEN, 242 GFP_NOFS); 243 if (!copy_name) { 244 fi = ERR_PTR(-ENOMEM); 245 goto out_err; 246 } 247 } 248 nameptr = copy_name; 249 memcpy(nameptr, fi->fileIdent + liu, 250 lfi - poffset); 251 memcpy(nameptr + lfi - poffset, 252 fibh->ebh->b_data, poffset); 253 } 254 } 255 256 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 257 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) 258 continue; 259 } 260 261 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { 262 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) 263 continue; 264 } 265 266 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) && 267 isdotdot) 268 goto out_ok; 269 270 if (!lfi) 271 continue; 272 273 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN); 274 if (flen < 0) { 275 fi = ERR_PTR(flen); 276 goto out_err; 277 } 278 279 if (udf_match(flen, fname, child->len, child->name)) 280 goto out_ok; 281 } 282 283 fi = NULL; 284 out_err: 285 if (fibh->sbh != fibh->ebh) 286 brelse(fibh->ebh); 287 brelse(fibh->sbh); 288 out_ok: 289 brelse(epos.bh); 290 kfree(fname); 291 kfree(copy_name); 292 293 return fi; 294 } 295 296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry, 297 unsigned int flags) 298 { 299 struct inode *inode = NULL; 300 struct fileIdentDesc cfi; 301 struct udf_fileident_bh fibh; 302 struct fileIdentDesc *fi; 303 304 if (dentry->d_name.len > UDF_NAME_LEN) 305 return ERR_PTR(-ENAMETOOLONG); 306 307 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 308 if (IS_ERR(fi)) 309 return ERR_CAST(fi); 310 311 if (fi) { 312 struct kernel_lb_addr loc; 313 314 if (fibh.sbh != fibh.ebh) 315 brelse(fibh.ebh); 316 brelse(fibh.sbh); 317 318 loc = lelb_to_cpu(cfi.icb.extLocation); 319 inode = udf_iget(dir->i_sb, &loc); 320 if (IS_ERR(inode)) 321 return ERR_CAST(inode); 322 } 323 324 return d_splice_alias(inode, dentry); 325 } 326 327 static struct fileIdentDesc *udf_add_entry(struct inode *dir, 328 struct dentry *dentry, 329 struct udf_fileident_bh *fibh, 330 struct fileIdentDesc *cfi, int *err) 331 { 332 struct super_block *sb = dir->i_sb; 333 struct fileIdentDesc *fi = NULL; 334 unsigned char *name = NULL; 335 int namelen; 336 loff_t f_pos; 337 loff_t size = udf_ext0_offset(dir) + dir->i_size; 338 int nfidlen; 339 udf_pblk_t block; 340 struct kernel_lb_addr eloc; 341 uint32_t elen = 0; 342 sector_t offset; 343 struct extent_position epos = {}; 344 struct udf_inode_info *dinfo; 345 346 fibh->sbh = fibh->ebh = NULL; 347 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 348 if (!name) { 349 *err = -ENOMEM; 350 goto out_err; 351 } 352 353 if (dentry) { 354 if (!dentry->d_name.len) { 355 *err = -EINVAL; 356 goto out_err; 357 } 358 namelen = udf_put_filename(sb, dentry->d_name.name, 359 dentry->d_name.len, 360 name, UDF_NAME_LEN_CS0); 361 if (!namelen) { 362 *err = -ENAMETOOLONG; 363 goto out_err; 364 } 365 } else { 366 namelen = 0; 367 } 368 369 nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD); 370 371 f_pos = udf_ext0_offset(dir); 372 373 fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 374 dinfo = UDF_I(dir); 375 if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 376 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos, 377 &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) { 378 block = udf_get_lb_pblock(dir->i_sb, 379 &dinfo->i_location, 0); 380 fibh->soffset = fibh->eoffset = sb->s_blocksize; 381 goto add; 382 } 383 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 384 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 385 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 386 epos.offset -= sizeof(struct short_ad); 387 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 388 epos.offset -= sizeof(struct long_ad); 389 } else 390 offset = 0; 391 392 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); 393 if (!fibh->sbh) { 394 *err = -EIO; 395 goto out_err; 396 } 397 398 block = dinfo->i_location.logicalBlockNum; 399 } 400 401 while (f_pos < size) { 402 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, 403 &elen, &offset); 404 405 if (!fi) { 406 *err = -EIO; 407 goto out_err; 408 } 409 410 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { 411 if (udf_dir_entry_len(cfi) == nfidlen) { 412 cfi->descTag.tagSerialNum = cpu_to_le16(1); 413 cfi->fileVersionNum = cpu_to_le16(1); 414 cfi->fileCharacteristics = 0; 415 cfi->lengthFileIdent = namelen; 416 cfi->lengthOfImpUse = cpu_to_le16(0); 417 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, 418 name)) 419 goto out_ok; 420 else { 421 *err = -EIO; 422 goto out_err; 423 } 424 } 425 } 426 } 427 428 add: 429 f_pos += nfidlen; 430 431 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && 432 sb->s_blocksize - fibh->eoffset < nfidlen) { 433 brelse(epos.bh); 434 epos.bh = NULL; 435 fibh->soffset -= udf_ext0_offset(dir); 436 fibh->eoffset -= udf_ext0_offset(dir); 437 f_pos -= udf_ext0_offset(dir); 438 if (fibh->sbh != fibh->ebh) 439 brelse(fibh->ebh); 440 brelse(fibh->sbh); 441 fibh->sbh = fibh->ebh = 442 udf_expand_dir_adinicb(dir, &block, err); 443 if (!fibh->sbh) 444 goto out_err; 445 epos.block = dinfo->i_location; 446 epos.offset = udf_file_entry_alloc_offset(dir); 447 /* Load extent udf_expand_dir_adinicb() has created */ 448 udf_current_aext(dir, &epos, &eloc, &elen, 1); 449 } 450 451 /* Entry fits into current block? */ 452 if (sb->s_blocksize - fibh->eoffset >= nfidlen) { 453 fibh->soffset = fibh->eoffset; 454 fibh->eoffset += nfidlen; 455 if (fibh->sbh != fibh->ebh) { 456 brelse(fibh->sbh); 457 fibh->sbh = fibh->ebh; 458 } 459 460 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 461 block = dinfo->i_location.logicalBlockNum; 462 fi = (struct fileIdentDesc *) 463 (dinfo->i_data + fibh->soffset - 464 udf_ext0_offset(dir) + 465 dinfo->i_lenEAttr); 466 } else { 467 block = eloc.logicalBlockNum + 468 ((elen - 1) >> 469 dir->i_sb->s_blocksize_bits); 470 fi = (struct fileIdentDesc *) 471 (fibh->sbh->b_data + fibh->soffset); 472 } 473 } else { 474 /* Round up last extent in the file */ 475 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1); 476 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 477 epos.offset -= sizeof(struct short_ad); 478 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 479 epos.offset -= sizeof(struct long_ad); 480 udf_write_aext(dir, &epos, &eloc, elen, 1); 481 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize 482 - 1) & ~(sb->s_blocksize - 1); 483 484 fibh->soffset = fibh->eoffset - sb->s_blocksize; 485 fibh->eoffset += nfidlen - sb->s_blocksize; 486 if (fibh->sbh != fibh->ebh) { 487 brelse(fibh->sbh); 488 fibh->sbh = fibh->ebh; 489 } 490 491 block = eloc.logicalBlockNum + ((elen - 1) >> 492 dir->i_sb->s_blocksize_bits); 493 fibh->ebh = udf_bread(dir, 494 f_pos >> dir->i_sb->s_blocksize_bits, 1, err); 495 if (!fibh->ebh) 496 goto out_err; 497 /* Extents could have been merged, invalidate our position */ 498 brelse(epos.bh); 499 epos.bh = NULL; 500 epos.block = dinfo->i_location; 501 epos.offset = udf_file_entry_alloc_offset(dir); 502 503 if (!fibh->soffset) { 504 /* Find the freshly allocated block */ 505 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 506 (EXT_RECORDED_ALLOCATED >> 30)) 507 ; 508 block = eloc.logicalBlockNum + ((elen - 1) >> 509 dir->i_sb->s_blocksize_bits); 510 brelse(fibh->sbh); 511 fibh->sbh = fibh->ebh; 512 fi = (struct fileIdentDesc *)(fibh->sbh->b_data); 513 } else { 514 fi = (struct fileIdentDesc *) 515 (fibh->sbh->b_data + sb->s_blocksize + 516 fibh->soffset); 517 } 518 } 519 520 memset(cfi, 0, sizeof(struct fileIdentDesc)); 521 if (UDF_SB(sb)->s_udfrev >= 0x0200) 522 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, 523 sizeof(struct tag)); 524 else 525 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, 526 sizeof(struct tag)); 527 cfi->fileVersionNum = cpu_to_le16(1); 528 cfi->lengthFileIdent = namelen; 529 cfi->lengthOfImpUse = cpu_to_le16(0); 530 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) { 531 dir->i_size += nfidlen; 532 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 533 dinfo->i_lenAlloc += nfidlen; 534 else { 535 /* Find the last extent and truncate it to proper size */ 536 while (udf_next_aext(dir, &epos, &eloc, &elen, 1) == 537 (EXT_RECORDED_ALLOCATED >> 30)) 538 ; 539 elen -= dinfo->i_lenExtents - dir->i_size; 540 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 541 epos.offset -= sizeof(struct short_ad); 542 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 543 epos.offset -= sizeof(struct long_ad); 544 udf_write_aext(dir, &epos, &eloc, elen, 1); 545 dinfo->i_lenExtents = dir->i_size; 546 } 547 548 mark_inode_dirty(dir); 549 goto out_ok; 550 } else { 551 *err = -EIO; 552 goto out_err; 553 } 554 555 out_err: 556 fi = NULL; 557 if (fibh->sbh != fibh->ebh) 558 brelse(fibh->ebh); 559 brelse(fibh->sbh); 560 out_ok: 561 brelse(epos.bh); 562 kfree(name); 563 return fi; 564 } 565 566 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi, 567 struct udf_fileident_bh *fibh, 568 struct fileIdentDesc *cfi) 569 { 570 cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED; 571 572 if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT)) 573 memset(&(cfi->icb), 0x00, sizeof(struct long_ad)); 574 575 return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL); 576 } 577 578 static int udf_add_nondir(struct dentry *dentry, struct inode *inode) 579 { 580 struct udf_inode_info *iinfo = UDF_I(inode); 581 struct inode *dir = d_inode(dentry->d_parent); 582 struct udf_fileident_bh fibh; 583 struct fileIdentDesc cfi, *fi; 584 int err; 585 586 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 587 if (unlikely(!fi)) { 588 inode_dec_link_count(inode); 589 discard_new_inode(inode); 590 return err; 591 } 592 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 593 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 594 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 595 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 596 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 597 dir->i_ctime = dir->i_mtime = current_time(dir); 598 mark_inode_dirty(dir); 599 if (fibh.sbh != fibh.ebh) 600 brelse(fibh.ebh); 601 brelse(fibh.sbh); 602 d_instantiate_new(dentry, inode); 603 604 return 0; 605 } 606 607 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir, 608 struct dentry *dentry, umode_t mode, bool excl) 609 { 610 struct inode *inode = udf_new_inode(dir, mode); 611 612 if (IS_ERR(inode)) 613 return PTR_ERR(inode); 614 615 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 616 inode->i_data.a_ops = &udf_adinicb_aops; 617 else 618 inode->i_data.a_ops = &udf_aops; 619 inode->i_op = &udf_file_inode_operations; 620 inode->i_fop = &udf_file_operations; 621 mark_inode_dirty(inode); 622 623 return udf_add_nondir(dentry, inode); 624 } 625 626 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, 627 struct dentry *dentry, umode_t mode) 628 { 629 struct inode *inode = udf_new_inode(dir, mode); 630 631 if (IS_ERR(inode)) 632 return PTR_ERR(inode); 633 634 if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 635 inode->i_data.a_ops = &udf_adinicb_aops; 636 else 637 inode->i_data.a_ops = &udf_aops; 638 inode->i_op = &udf_file_inode_operations; 639 inode->i_fop = &udf_file_operations; 640 mark_inode_dirty(inode); 641 d_tmpfile(dentry, inode); 642 unlock_new_inode(inode); 643 return 0; 644 } 645 646 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir, 647 struct dentry *dentry, umode_t mode, dev_t rdev) 648 { 649 struct inode *inode; 650 651 if (!old_valid_dev(rdev)) 652 return -EINVAL; 653 654 inode = udf_new_inode(dir, mode); 655 if (IS_ERR(inode)) 656 return PTR_ERR(inode); 657 658 init_special_inode(inode, mode, rdev); 659 return udf_add_nondir(dentry, inode); 660 } 661 662 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 663 struct dentry *dentry, umode_t mode) 664 { 665 struct inode *inode; 666 struct udf_fileident_bh fibh; 667 struct fileIdentDesc cfi, *fi; 668 int err; 669 struct udf_inode_info *dinfo = UDF_I(dir); 670 struct udf_inode_info *iinfo; 671 672 inode = udf_new_inode(dir, S_IFDIR | mode); 673 if (IS_ERR(inode)) 674 return PTR_ERR(inode); 675 676 iinfo = UDF_I(inode); 677 inode->i_op = &udf_dir_inode_operations; 678 inode->i_fop = &udf_dir_operations; 679 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 680 if (!fi) { 681 inode_dec_link_count(inode); 682 discard_new_inode(inode); 683 goto out; 684 } 685 set_nlink(inode, 2); 686 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 687 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 688 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 689 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 690 cfi.fileCharacteristics = 691 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 692 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 693 brelse(fibh.sbh); 694 mark_inode_dirty(inode); 695 696 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 697 if (!fi) { 698 clear_nlink(inode); 699 mark_inode_dirty(inode); 700 discard_new_inode(inode); 701 goto out; 702 } 703 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 704 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 705 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 706 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 707 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 708 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 709 inc_nlink(dir); 710 dir->i_ctime = dir->i_mtime = current_time(dir); 711 mark_inode_dirty(dir); 712 d_instantiate_new(dentry, inode); 713 if (fibh.sbh != fibh.ebh) 714 brelse(fibh.ebh); 715 brelse(fibh.sbh); 716 err = 0; 717 718 out: 719 return err; 720 } 721 722 static int empty_dir(struct inode *dir) 723 { 724 struct fileIdentDesc *fi, cfi; 725 struct udf_fileident_bh fibh; 726 loff_t f_pos; 727 loff_t size = udf_ext0_offset(dir) + dir->i_size; 728 udf_pblk_t block; 729 struct kernel_lb_addr eloc; 730 uint32_t elen; 731 sector_t offset; 732 struct extent_position epos = {}; 733 struct udf_inode_info *dinfo = UDF_I(dir); 734 735 f_pos = udf_ext0_offset(dir); 736 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 737 738 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 739 fibh.sbh = fibh.ebh = NULL; 740 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 741 &epos, &eloc, &elen, &offset) == 742 (EXT_RECORDED_ALLOCATED >> 30)) { 743 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 744 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 745 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 746 epos.offset -= sizeof(struct short_ad); 747 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 748 epos.offset -= sizeof(struct long_ad); 749 } else 750 offset = 0; 751 752 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 753 if (!fibh.sbh) { 754 brelse(epos.bh); 755 return 0; 756 } 757 } else { 758 brelse(epos.bh); 759 return 0; 760 } 761 762 while (f_pos < size) { 763 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 764 &elen, &offset); 765 if (!fi) { 766 if (fibh.sbh != fibh.ebh) 767 brelse(fibh.ebh); 768 brelse(fibh.sbh); 769 brelse(epos.bh); 770 return 0; 771 } 772 773 if (cfi.lengthFileIdent && 774 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 775 if (fibh.sbh != fibh.ebh) 776 brelse(fibh.ebh); 777 brelse(fibh.sbh); 778 brelse(epos.bh); 779 return 0; 780 } 781 } 782 783 if (fibh.sbh != fibh.ebh) 784 brelse(fibh.ebh); 785 brelse(fibh.sbh); 786 brelse(epos.bh); 787 788 return 1; 789 } 790 791 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 792 { 793 int retval; 794 struct inode *inode = d_inode(dentry); 795 struct udf_fileident_bh fibh; 796 struct fileIdentDesc *fi, cfi; 797 struct kernel_lb_addr tloc; 798 799 retval = -ENOENT; 800 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 801 if (IS_ERR_OR_NULL(fi)) { 802 if (fi) 803 retval = PTR_ERR(fi); 804 goto out; 805 } 806 807 retval = -EIO; 808 tloc = lelb_to_cpu(cfi.icb.extLocation); 809 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 810 goto end_rmdir; 811 retval = -ENOTEMPTY; 812 if (!empty_dir(inode)) 813 goto end_rmdir; 814 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 815 if (retval) 816 goto end_rmdir; 817 if (inode->i_nlink != 2) 818 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 819 inode->i_nlink); 820 clear_nlink(inode); 821 inode->i_size = 0; 822 inode_dec_link_count(dir); 823 inode->i_ctime = dir->i_ctime = dir->i_mtime = 824 current_time(inode); 825 mark_inode_dirty(dir); 826 827 end_rmdir: 828 if (fibh.sbh != fibh.ebh) 829 brelse(fibh.ebh); 830 brelse(fibh.sbh); 831 832 out: 833 return retval; 834 } 835 836 static int udf_unlink(struct inode *dir, struct dentry *dentry) 837 { 838 int retval; 839 struct inode *inode = d_inode(dentry); 840 struct udf_fileident_bh fibh; 841 struct fileIdentDesc *fi; 842 struct fileIdentDesc cfi; 843 struct kernel_lb_addr tloc; 844 845 retval = -ENOENT; 846 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 847 848 if (IS_ERR_OR_NULL(fi)) { 849 if (fi) 850 retval = PTR_ERR(fi); 851 goto out; 852 } 853 854 retval = -EIO; 855 tloc = lelb_to_cpu(cfi.icb.extLocation); 856 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 857 goto end_unlink; 858 859 if (!inode->i_nlink) { 860 udf_debug("Deleting nonexistent file (%lu), %u\n", 861 inode->i_ino, inode->i_nlink); 862 set_nlink(inode, 1); 863 } 864 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 865 if (retval) 866 goto end_unlink; 867 dir->i_ctime = dir->i_mtime = current_time(dir); 868 mark_inode_dirty(dir); 869 inode_dec_link_count(inode); 870 inode->i_ctime = dir->i_ctime; 871 retval = 0; 872 873 end_unlink: 874 if (fibh.sbh != fibh.ebh) 875 brelse(fibh.ebh); 876 brelse(fibh.sbh); 877 878 out: 879 return retval; 880 } 881 882 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir, 883 struct dentry *dentry, const char *symname) 884 { 885 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 886 struct pathComponent *pc; 887 const char *compstart; 888 struct extent_position epos = {}; 889 int eoffset, elen = 0; 890 uint8_t *ea; 891 int err; 892 udf_pblk_t block; 893 unsigned char *name = NULL; 894 int namelen; 895 struct udf_inode_info *iinfo; 896 struct super_block *sb = dir->i_sb; 897 898 if (IS_ERR(inode)) 899 return PTR_ERR(inode); 900 901 iinfo = UDF_I(inode); 902 down_write(&iinfo->i_data_sem); 903 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 904 if (!name) { 905 err = -ENOMEM; 906 goto out_no_entry; 907 } 908 909 inode->i_data.a_ops = &udf_symlink_aops; 910 inode->i_op = &udf_symlink_inode_operations; 911 inode_nohighmem(inode); 912 913 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 914 struct kernel_lb_addr eloc; 915 uint32_t bsize; 916 917 block = udf_new_block(sb, inode, 918 iinfo->i_location.partitionReferenceNum, 919 iinfo->i_location.logicalBlockNum, &err); 920 if (!block) 921 goto out_no_entry; 922 epos.block = iinfo->i_location; 923 epos.offset = udf_file_entry_alloc_offset(inode); 924 epos.bh = NULL; 925 eloc.logicalBlockNum = block; 926 eloc.partitionReferenceNum = 927 iinfo->i_location.partitionReferenceNum; 928 bsize = sb->s_blocksize; 929 iinfo->i_lenExtents = bsize; 930 udf_add_aext(inode, &epos, &eloc, bsize, 0); 931 brelse(epos.bh); 932 933 block = udf_get_pblock(sb, block, 934 iinfo->i_location.partitionReferenceNum, 935 0); 936 epos.bh = udf_tgetblk(sb, block); 937 lock_buffer(epos.bh); 938 memset(epos.bh->b_data, 0x00, bsize); 939 set_buffer_uptodate(epos.bh); 940 unlock_buffer(epos.bh); 941 mark_buffer_dirty_inode(epos.bh, inode); 942 ea = epos.bh->b_data + udf_ext0_offset(inode); 943 } else 944 ea = iinfo->i_data + iinfo->i_lenEAttr; 945 946 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 947 pc = (struct pathComponent *)ea; 948 949 if (*symname == '/') { 950 do { 951 symname++; 952 } while (*symname == '/'); 953 954 pc->componentType = 1; 955 pc->lengthComponentIdent = 0; 956 pc->componentFileVersionNum = 0; 957 elen += sizeof(struct pathComponent); 958 } 959 960 err = -ENAMETOOLONG; 961 962 while (*symname) { 963 if (elen + sizeof(struct pathComponent) > eoffset) 964 goto out_no_entry; 965 966 pc = (struct pathComponent *)(ea + elen); 967 968 compstart = symname; 969 970 do { 971 symname++; 972 } while (*symname && *symname != '/'); 973 974 pc->componentType = 5; 975 pc->lengthComponentIdent = 0; 976 pc->componentFileVersionNum = 0; 977 if (compstart[0] == '.') { 978 if ((symname - compstart) == 1) 979 pc->componentType = 4; 980 else if ((symname - compstart) == 2 && 981 compstart[1] == '.') 982 pc->componentType = 3; 983 } 984 985 if (pc->componentType == 5) { 986 namelen = udf_put_filename(sb, compstart, 987 symname - compstart, 988 name, UDF_NAME_LEN_CS0); 989 if (!namelen) 990 goto out_no_entry; 991 992 if (elen + sizeof(struct pathComponent) + namelen > 993 eoffset) 994 goto out_no_entry; 995 else 996 pc->lengthComponentIdent = namelen; 997 998 memcpy(pc->componentIdent, name, namelen); 999 } 1000 1001 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1002 1003 if (*symname) { 1004 do { 1005 symname++; 1006 } while (*symname == '/'); 1007 } 1008 } 1009 1010 brelse(epos.bh); 1011 inode->i_size = elen; 1012 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1013 iinfo->i_lenAlloc = inode->i_size; 1014 else 1015 udf_truncate_tail_extent(inode); 1016 mark_inode_dirty(inode); 1017 up_write(&iinfo->i_data_sem); 1018 1019 err = udf_add_nondir(dentry, inode); 1020 out: 1021 kfree(name); 1022 return err; 1023 1024 out_no_entry: 1025 up_write(&iinfo->i_data_sem); 1026 inode_dec_link_count(inode); 1027 discard_new_inode(inode); 1028 goto out; 1029 } 1030 1031 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1032 struct dentry *dentry) 1033 { 1034 struct inode *inode = d_inode(old_dentry); 1035 struct udf_fileident_bh fibh; 1036 struct fileIdentDesc cfi, *fi; 1037 int err; 1038 1039 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1040 if (!fi) { 1041 return err; 1042 } 1043 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1044 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1045 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1046 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1047 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1048 } 1049 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1050 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1051 mark_inode_dirty(dir); 1052 1053 if (fibh.sbh != fibh.ebh) 1054 brelse(fibh.ebh); 1055 brelse(fibh.sbh); 1056 inc_nlink(inode); 1057 inode->i_ctime = current_time(inode); 1058 mark_inode_dirty(inode); 1059 dir->i_ctime = dir->i_mtime = current_time(dir); 1060 mark_inode_dirty(dir); 1061 ihold(inode); 1062 d_instantiate(dentry, inode); 1063 1064 return 0; 1065 } 1066 1067 /* Anybody can rename anything with this: the permission checks are left to the 1068 * higher-level routines. 1069 */ 1070 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 1071 struct dentry *old_dentry, struct inode *new_dir, 1072 struct dentry *new_dentry, unsigned int flags) 1073 { 1074 struct inode *old_inode = d_inode(old_dentry); 1075 struct inode *new_inode = d_inode(new_dentry); 1076 struct udf_fileident_bh ofibh, nfibh; 1077 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1078 struct fileIdentDesc ocfi, ncfi; 1079 struct buffer_head *dir_bh = NULL; 1080 int retval = -ENOENT; 1081 struct kernel_lb_addr tloc; 1082 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1083 1084 if (flags & ~RENAME_NOREPLACE) 1085 return -EINVAL; 1086 1087 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1088 if (IS_ERR(ofi)) { 1089 retval = PTR_ERR(ofi); 1090 goto end_rename; 1091 } 1092 1093 if (ofibh.sbh != ofibh.ebh) 1094 brelse(ofibh.ebh); 1095 1096 brelse(ofibh.sbh); 1097 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1098 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1099 != old_inode->i_ino) 1100 goto end_rename; 1101 1102 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1103 if (IS_ERR(nfi)) { 1104 retval = PTR_ERR(nfi); 1105 goto end_rename; 1106 } 1107 if (nfi && !new_inode) { 1108 if (nfibh.sbh != nfibh.ebh) 1109 brelse(nfibh.ebh); 1110 brelse(nfibh.sbh); 1111 nfi = NULL; 1112 } 1113 if (S_ISDIR(old_inode->i_mode)) { 1114 int offset = udf_ext0_offset(old_inode); 1115 1116 if (new_inode) { 1117 retval = -ENOTEMPTY; 1118 if (!empty_dir(new_inode)) 1119 goto end_rename; 1120 } 1121 retval = -EIO; 1122 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1123 dir_fi = udf_get_fileident( 1124 old_iinfo->i_data - 1125 (old_iinfo->i_efe ? 1126 sizeof(struct extendedFileEntry) : 1127 sizeof(struct fileEntry)), 1128 old_inode->i_sb->s_blocksize, &offset); 1129 } else { 1130 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1131 if (!dir_bh) 1132 goto end_rename; 1133 dir_fi = udf_get_fileident(dir_bh->b_data, 1134 old_inode->i_sb->s_blocksize, &offset); 1135 } 1136 if (!dir_fi) 1137 goto end_rename; 1138 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1139 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1140 old_dir->i_ino) 1141 goto end_rename; 1142 } 1143 if (!nfi) { 1144 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1145 &retval); 1146 if (!nfi) 1147 goto end_rename; 1148 } 1149 1150 /* 1151 * Like most other Unix systems, set the ctime for inodes on a 1152 * rename. 1153 */ 1154 old_inode->i_ctime = current_time(old_inode); 1155 mark_inode_dirty(old_inode); 1156 1157 /* 1158 * ok, that's it 1159 */ 1160 ncfi.fileVersionNum = ocfi.fileVersionNum; 1161 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1162 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1163 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1164 1165 /* The old fid may have moved - find it again */ 1166 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1167 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1168 1169 if (new_inode) { 1170 new_inode->i_ctime = current_time(new_inode); 1171 inode_dec_link_count(new_inode); 1172 } 1173 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1174 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1175 mark_inode_dirty(old_dir); 1176 mark_inode_dirty(new_dir); 1177 1178 if (dir_fi) { 1179 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1180 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1181 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1182 mark_inode_dirty(old_inode); 1183 else 1184 mark_buffer_dirty_inode(dir_bh, old_inode); 1185 1186 inode_dec_link_count(old_dir); 1187 if (new_inode) 1188 inode_dec_link_count(new_inode); 1189 else { 1190 inc_nlink(new_dir); 1191 mark_inode_dirty(new_dir); 1192 } 1193 } 1194 1195 if (ofi) { 1196 if (ofibh.sbh != ofibh.ebh) 1197 brelse(ofibh.ebh); 1198 brelse(ofibh.sbh); 1199 } 1200 1201 retval = 0; 1202 1203 end_rename: 1204 brelse(dir_bh); 1205 if (nfi) { 1206 if (nfibh.sbh != nfibh.ebh) 1207 brelse(nfibh.ebh); 1208 brelse(nfibh.sbh); 1209 } 1210 1211 return retval; 1212 } 1213 1214 static struct dentry *udf_get_parent(struct dentry *child) 1215 { 1216 struct kernel_lb_addr tloc; 1217 struct inode *inode = NULL; 1218 struct fileIdentDesc cfi; 1219 struct udf_fileident_bh fibh; 1220 1221 if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi)) 1222 return ERR_PTR(-EACCES); 1223 1224 if (fibh.sbh != fibh.ebh) 1225 brelse(fibh.ebh); 1226 brelse(fibh.sbh); 1227 1228 tloc = lelb_to_cpu(cfi.icb.extLocation); 1229 inode = udf_iget(child->d_sb, &tloc); 1230 if (IS_ERR(inode)) 1231 return ERR_CAST(inode); 1232 1233 return d_obtain_alias(inode); 1234 } 1235 1236 1237 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1238 u16 partref, __u32 generation) 1239 { 1240 struct inode *inode; 1241 struct kernel_lb_addr loc; 1242 1243 if (block == 0) 1244 return ERR_PTR(-ESTALE); 1245 1246 loc.logicalBlockNum = block; 1247 loc.partitionReferenceNum = partref; 1248 inode = udf_iget(sb, &loc); 1249 1250 if (IS_ERR(inode)) 1251 return ERR_CAST(inode); 1252 1253 if (generation && inode->i_generation != generation) { 1254 iput(inode); 1255 return ERR_PTR(-ESTALE); 1256 } 1257 return d_obtain_alias(inode); 1258 } 1259 1260 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1261 struct fid *fid, int fh_len, int fh_type) 1262 { 1263 if (fh_len < 3 || 1264 (fh_type != FILEID_UDF_WITH_PARENT && 1265 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1266 return NULL; 1267 1268 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1269 fid->udf.generation); 1270 } 1271 1272 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1273 struct fid *fid, int fh_len, int fh_type) 1274 { 1275 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1276 return NULL; 1277 1278 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1279 fid->udf.parent_partref, 1280 fid->udf.parent_generation); 1281 } 1282 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1283 struct inode *parent) 1284 { 1285 int len = *lenp; 1286 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1287 struct fid *fid = (struct fid *)fh; 1288 int type = FILEID_UDF_WITHOUT_PARENT; 1289 1290 if (parent && (len < 5)) { 1291 *lenp = 5; 1292 return FILEID_INVALID; 1293 } else if (len < 3) { 1294 *lenp = 3; 1295 return FILEID_INVALID; 1296 } 1297 1298 *lenp = 3; 1299 fid->udf.block = location.logicalBlockNum; 1300 fid->udf.partref = location.partitionReferenceNum; 1301 fid->udf.parent_partref = 0; 1302 fid->udf.generation = inode->i_generation; 1303 1304 if (parent) { 1305 location = UDF_I(parent)->i_location; 1306 fid->udf.parent_block = location.logicalBlockNum; 1307 fid->udf.parent_partref = location.partitionReferenceNum; 1308 fid->udf.parent_generation = inode->i_generation; 1309 *lenp = 5; 1310 type = FILEID_UDF_WITH_PARENT; 1311 } 1312 1313 return type; 1314 } 1315 1316 const struct export_operations udf_export_ops = { 1317 .encode_fh = udf_encode_fh, 1318 .fh_to_dentry = udf_fh_to_dentry, 1319 .fh_to_parent = udf_fh_to_parent, 1320 .get_parent = udf_get_parent, 1321 }; 1322 1323 const struct inode_operations udf_dir_inode_operations = { 1324 .lookup = udf_lookup, 1325 .create = udf_create, 1326 .link = udf_link, 1327 .unlink = udf_unlink, 1328 .symlink = udf_symlink, 1329 .mkdir = udf_mkdir, 1330 .rmdir = udf_rmdir, 1331 .mknod = udf_mknod, 1332 .rename = udf_rename, 1333 .tmpfile = udf_tmpfile, 1334 }; 1335