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 inode *dir, struct dentry *dentry, umode_t mode, 608 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 inode *dir, 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 inode *dir, struct dentry *dentry, umode_t mode, 646 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 inode *dir, struct dentry *dentry, umode_t mode) 662 { 663 struct inode *inode; 664 struct udf_fileident_bh fibh; 665 struct fileIdentDesc cfi, *fi; 666 int err; 667 struct udf_inode_info *dinfo = UDF_I(dir); 668 struct udf_inode_info *iinfo; 669 670 inode = udf_new_inode(dir, S_IFDIR | mode); 671 if (IS_ERR(inode)) 672 return PTR_ERR(inode); 673 674 iinfo = UDF_I(inode); 675 inode->i_op = &udf_dir_inode_operations; 676 inode->i_fop = &udf_dir_operations; 677 fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); 678 if (!fi) { 679 inode_dec_link_count(inode); 680 discard_new_inode(inode); 681 goto out; 682 } 683 set_nlink(inode, 2); 684 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 685 cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location); 686 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 687 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL); 688 cfi.fileCharacteristics = 689 FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT; 690 udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL); 691 brelse(fibh.sbh); 692 mark_inode_dirty(inode); 693 694 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 695 if (!fi) { 696 clear_nlink(inode); 697 mark_inode_dirty(inode); 698 discard_new_inode(inode); 699 goto out; 700 } 701 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 702 cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location); 703 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 704 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL); 705 cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY; 706 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 707 inc_nlink(dir); 708 dir->i_ctime = dir->i_mtime = current_time(dir); 709 mark_inode_dirty(dir); 710 d_instantiate_new(dentry, inode); 711 if (fibh.sbh != fibh.ebh) 712 brelse(fibh.ebh); 713 brelse(fibh.sbh); 714 err = 0; 715 716 out: 717 return err; 718 } 719 720 static int empty_dir(struct inode *dir) 721 { 722 struct fileIdentDesc *fi, cfi; 723 struct udf_fileident_bh fibh; 724 loff_t f_pos; 725 loff_t size = udf_ext0_offset(dir) + dir->i_size; 726 udf_pblk_t block; 727 struct kernel_lb_addr eloc; 728 uint32_t elen; 729 sector_t offset; 730 struct extent_position epos = {}; 731 struct udf_inode_info *dinfo = UDF_I(dir); 732 733 f_pos = udf_ext0_offset(dir); 734 fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1); 735 736 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 737 fibh.sbh = fibh.ebh = NULL; 738 else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, 739 &epos, &eloc, &elen, &offset) == 740 (EXT_RECORDED_ALLOCATED >> 30)) { 741 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); 742 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { 743 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) 744 epos.offset -= sizeof(struct short_ad); 745 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG) 746 epos.offset -= sizeof(struct long_ad); 747 } else 748 offset = 0; 749 750 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block); 751 if (!fibh.sbh) { 752 brelse(epos.bh); 753 return 0; 754 } 755 } else { 756 brelse(epos.bh); 757 return 0; 758 } 759 760 while (f_pos < size) { 761 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, 762 &elen, &offset); 763 if (!fi) { 764 if (fibh.sbh != fibh.ebh) 765 brelse(fibh.ebh); 766 brelse(fibh.sbh); 767 brelse(epos.bh); 768 return 0; 769 } 770 771 if (cfi.lengthFileIdent && 772 (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) { 773 if (fibh.sbh != fibh.ebh) 774 brelse(fibh.ebh); 775 brelse(fibh.sbh); 776 brelse(epos.bh); 777 return 0; 778 } 779 } 780 781 if (fibh.sbh != fibh.ebh) 782 brelse(fibh.ebh); 783 brelse(fibh.sbh); 784 brelse(epos.bh); 785 786 return 1; 787 } 788 789 static int udf_rmdir(struct inode *dir, struct dentry *dentry) 790 { 791 int retval; 792 struct inode *inode = d_inode(dentry); 793 struct udf_fileident_bh fibh; 794 struct fileIdentDesc *fi, cfi; 795 struct kernel_lb_addr tloc; 796 797 retval = -ENOENT; 798 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 799 if (IS_ERR_OR_NULL(fi)) { 800 if (fi) 801 retval = PTR_ERR(fi); 802 goto out; 803 } 804 805 retval = -EIO; 806 tloc = lelb_to_cpu(cfi.icb.extLocation); 807 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 808 goto end_rmdir; 809 retval = -ENOTEMPTY; 810 if (!empty_dir(inode)) 811 goto end_rmdir; 812 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 813 if (retval) 814 goto end_rmdir; 815 if (inode->i_nlink != 2) 816 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n", 817 inode->i_nlink); 818 clear_nlink(inode); 819 inode->i_size = 0; 820 inode_dec_link_count(dir); 821 inode->i_ctime = dir->i_ctime = dir->i_mtime = 822 current_time(inode); 823 mark_inode_dirty(dir); 824 825 end_rmdir: 826 if (fibh.sbh != fibh.ebh) 827 brelse(fibh.ebh); 828 brelse(fibh.sbh); 829 830 out: 831 return retval; 832 } 833 834 static int udf_unlink(struct inode *dir, struct dentry *dentry) 835 { 836 int retval; 837 struct inode *inode = d_inode(dentry); 838 struct udf_fileident_bh fibh; 839 struct fileIdentDesc *fi; 840 struct fileIdentDesc cfi; 841 struct kernel_lb_addr tloc; 842 843 retval = -ENOENT; 844 fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi); 845 846 if (IS_ERR_OR_NULL(fi)) { 847 if (fi) 848 retval = PTR_ERR(fi); 849 goto out; 850 } 851 852 retval = -EIO; 853 tloc = lelb_to_cpu(cfi.icb.extLocation); 854 if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino) 855 goto end_unlink; 856 857 if (!inode->i_nlink) { 858 udf_debug("Deleting nonexistent file (%lu), %u\n", 859 inode->i_ino, inode->i_nlink); 860 set_nlink(inode, 1); 861 } 862 retval = udf_delete_entry(dir, fi, &fibh, &cfi); 863 if (retval) 864 goto end_unlink; 865 dir->i_ctime = dir->i_mtime = current_time(dir); 866 mark_inode_dirty(dir); 867 inode_dec_link_count(inode); 868 inode->i_ctime = dir->i_ctime; 869 retval = 0; 870 871 end_unlink: 872 if (fibh.sbh != fibh.ebh) 873 brelse(fibh.ebh); 874 brelse(fibh.sbh); 875 876 out: 877 return retval; 878 } 879 880 static int udf_symlink(struct inode *dir, struct dentry *dentry, 881 const char *symname) 882 { 883 struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777); 884 struct pathComponent *pc; 885 const char *compstart; 886 struct extent_position epos = {}; 887 int eoffset, elen = 0; 888 uint8_t *ea; 889 int err; 890 udf_pblk_t block; 891 unsigned char *name = NULL; 892 int namelen; 893 struct udf_inode_info *iinfo; 894 struct super_block *sb = dir->i_sb; 895 896 if (IS_ERR(inode)) 897 return PTR_ERR(inode); 898 899 iinfo = UDF_I(inode); 900 down_write(&iinfo->i_data_sem); 901 name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS); 902 if (!name) { 903 err = -ENOMEM; 904 goto out_no_entry; 905 } 906 907 inode->i_data.a_ops = &udf_symlink_aops; 908 inode->i_op = &udf_symlink_inode_operations; 909 inode_nohighmem(inode); 910 911 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { 912 struct kernel_lb_addr eloc; 913 uint32_t bsize; 914 915 block = udf_new_block(sb, inode, 916 iinfo->i_location.partitionReferenceNum, 917 iinfo->i_location.logicalBlockNum, &err); 918 if (!block) 919 goto out_no_entry; 920 epos.block = iinfo->i_location; 921 epos.offset = udf_file_entry_alloc_offset(inode); 922 epos.bh = NULL; 923 eloc.logicalBlockNum = block; 924 eloc.partitionReferenceNum = 925 iinfo->i_location.partitionReferenceNum; 926 bsize = sb->s_blocksize; 927 iinfo->i_lenExtents = bsize; 928 udf_add_aext(inode, &epos, &eloc, bsize, 0); 929 brelse(epos.bh); 930 931 block = udf_get_pblock(sb, block, 932 iinfo->i_location.partitionReferenceNum, 933 0); 934 epos.bh = udf_tgetblk(sb, block); 935 lock_buffer(epos.bh); 936 memset(epos.bh->b_data, 0x00, bsize); 937 set_buffer_uptodate(epos.bh); 938 unlock_buffer(epos.bh); 939 mark_buffer_dirty_inode(epos.bh, inode); 940 ea = epos.bh->b_data + udf_ext0_offset(inode); 941 } else 942 ea = iinfo->i_data + iinfo->i_lenEAttr; 943 944 eoffset = sb->s_blocksize - udf_ext0_offset(inode); 945 pc = (struct pathComponent *)ea; 946 947 if (*symname == '/') { 948 do { 949 symname++; 950 } while (*symname == '/'); 951 952 pc->componentType = 1; 953 pc->lengthComponentIdent = 0; 954 pc->componentFileVersionNum = 0; 955 elen += sizeof(struct pathComponent); 956 } 957 958 err = -ENAMETOOLONG; 959 960 while (*symname) { 961 if (elen + sizeof(struct pathComponent) > eoffset) 962 goto out_no_entry; 963 964 pc = (struct pathComponent *)(ea + elen); 965 966 compstart = symname; 967 968 do { 969 symname++; 970 } while (*symname && *symname != '/'); 971 972 pc->componentType = 5; 973 pc->lengthComponentIdent = 0; 974 pc->componentFileVersionNum = 0; 975 if (compstart[0] == '.') { 976 if ((symname - compstart) == 1) 977 pc->componentType = 4; 978 else if ((symname - compstart) == 2 && 979 compstart[1] == '.') 980 pc->componentType = 3; 981 } 982 983 if (pc->componentType == 5) { 984 namelen = udf_put_filename(sb, compstart, 985 symname - compstart, 986 name, UDF_NAME_LEN_CS0); 987 if (!namelen) 988 goto out_no_entry; 989 990 if (elen + sizeof(struct pathComponent) + namelen > 991 eoffset) 992 goto out_no_entry; 993 else 994 pc->lengthComponentIdent = namelen; 995 996 memcpy(pc->componentIdent, name, namelen); 997 } 998 999 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent; 1000 1001 if (*symname) { 1002 do { 1003 symname++; 1004 } while (*symname == '/'); 1005 } 1006 } 1007 1008 brelse(epos.bh); 1009 inode->i_size = elen; 1010 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1011 iinfo->i_lenAlloc = inode->i_size; 1012 else 1013 udf_truncate_tail_extent(inode); 1014 mark_inode_dirty(inode); 1015 up_write(&iinfo->i_data_sem); 1016 1017 err = udf_add_nondir(dentry, inode); 1018 out: 1019 kfree(name); 1020 return err; 1021 1022 out_no_entry: 1023 up_write(&iinfo->i_data_sem); 1024 inode_dec_link_count(inode); 1025 discard_new_inode(inode); 1026 goto out; 1027 } 1028 1029 static int udf_link(struct dentry *old_dentry, struct inode *dir, 1030 struct dentry *dentry) 1031 { 1032 struct inode *inode = d_inode(old_dentry); 1033 struct udf_fileident_bh fibh; 1034 struct fileIdentDesc cfi, *fi; 1035 int err; 1036 1037 fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); 1038 if (!fi) { 1039 return err; 1040 } 1041 cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize); 1042 cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location); 1043 if (UDF_SB(inode->i_sb)->s_lvid_bh) { 1044 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse = 1045 cpu_to_le32(lvid_get_unique_id(inode->i_sb)); 1046 } 1047 udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); 1048 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1049 mark_inode_dirty(dir); 1050 1051 if (fibh.sbh != fibh.ebh) 1052 brelse(fibh.ebh); 1053 brelse(fibh.sbh); 1054 inc_nlink(inode); 1055 inode->i_ctime = current_time(inode); 1056 mark_inode_dirty(inode); 1057 dir->i_ctime = dir->i_mtime = current_time(dir); 1058 mark_inode_dirty(dir); 1059 ihold(inode); 1060 d_instantiate(dentry, inode); 1061 1062 return 0; 1063 } 1064 1065 /* Anybody can rename anything with this: the permission checks are left to the 1066 * higher-level routines. 1067 */ 1068 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry, 1069 struct inode *new_dir, struct dentry *new_dentry, 1070 unsigned int flags) 1071 { 1072 struct inode *old_inode = d_inode(old_dentry); 1073 struct inode *new_inode = d_inode(new_dentry); 1074 struct udf_fileident_bh ofibh, nfibh; 1075 struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL; 1076 struct fileIdentDesc ocfi, ncfi; 1077 struct buffer_head *dir_bh = NULL; 1078 int retval = -ENOENT; 1079 struct kernel_lb_addr tloc; 1080 struct udf_inode_info *old_iinfo = UDF_I(old_inode); 1081 1082 if (flags & ~RENAME_NOREPLACE) 1083 return -EINVAL; 1084 1085 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1086 if (IS_ERR(ofi)) { 1087 retval = PTR_ERR(ofi); 1088 goto end_rename; 1089 } 1090 1091 if (ofibh.sbh != ofibh.ebh) 1092 brelse(ofibh.ebh); 1093 1094 brelse(ofibh.sbh); 1095 tloc = lelb_to_cpu(ocfi.icb.extLocation); 1096 if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) 1097 != old_inode->i_ino) 1098 goto end_rename; 1099 1100 nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi); 1101 if (IS_ERR(nfi)) { 1102 retval = PTR_ERR(nfi); 1103 goto end_rename; 1104 } 1105 if (nfi && !new_inode) { 1106 if (nfibh.sbh != nfibh.ebh) 1107 brelse(nfibh.ebh); 1108 brelse(nfibh.sbh); 1109 nfi = NULL; 1110 } 1111 if (S_ISDIR(old_inode->i_mode)) { 1112 int offset = udf_ext0_offset(old_inode); 1113 1114 if (new_inode) { 1115 retval = -ENOTEMPTY; 1116 if (!empty_dir(new_inode)) 1117 goto end_rename; 1118 } 1119 retval = -EIO; 1120 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { 1121 dir_fi = udf_get_fileident( 1122 old_iinfo->i_data - 1123 (old_iinfo->i_efe ? 1124 sizeof(struct extendedFileEntry) : 1125 sizeof(struct fileEntry)), 1126 old_inode->i_sb->s_blocksize, &offset); 1127 } else { 1128 dir_bh = udf_bread(old_inode, 0, 0, &retval); 1129 if (!dir_bh) 1130 goto end_rename; 1131 dir_fi = udf_get_fileident(dir_bh->b_data, 1132 old_inode->i_sb->s_blocksize, &offset); 1133 } 1134 if (!dir_fi) 1135 goto end_rename; 1136 tloc = lelb_to_cpu(dir_fi->icb.extLocation); 1137 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) != 1138 old_dir->i_ino) 1139 goto end_rename; 1140 } 1141 if (!nfi) { 1142 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, 1143 &retval); 1144 if (!nfi) 1145 goto end_rename; 1146 } 1147 1148 /* 1149 * Like most other Unix systems, set the ctime for inodes on a 1150 * rename. 1151 */ 1152 old_inode->i_ctime = current_time(old_inode); 1153 mark_inode_dirty(old_inode); 1154 1155 /* 1156 * ok, that's it 1157 */ 1158 ncfi.fileVersionNum = ocfi.fileVersionNum; 1159 ncfi.fileCharacteristics = ocfi.fileCharacteristics; 1160 memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb)); 1161 udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL); 1162 1163 /* The old fid may have moved - find it again */ 1164 ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi); 1165 udf_delete_entry(old_dir, ofi, &ofibh, &ocfi); 1166 1167 if (new_inode) { 1168 new_inode->i_ctime = current_time(new_inode); 1169 inode_dec_link_count(new_inode); 1170 } 1171 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 1172 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); 1173 mark_inode_dirty(old_dir); 1174 mark_inode_dirty(new_dir); 1175 1176 if (dir_fi) { 1177 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location); 1178 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi)); 1179 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) 1180 mark_inode_dirty(old_inode); 1181 else 1182 mark_buffer_dirty_inode(dir_bh, old_inode); 1183 1184 inode_dec_link_count(old_dir); 1185 if (new_inode) 1186 inode_dec_link_count(new_inode); 1187 else { 1188 inc_nlink(new_dir); 1189 mark_inode_dirty(new_dir); 1190 } 1191 } 1192 1193 if (ofi) { 1194 if (ofibh.sbh != ofibh.ebh) 1195 brelse(ofibh.ebh); 1196 brelse(ofibh.sbh); 1197 } 1198 1199 retval = 0; 1200 1201 end_rename: 1202 brelse(dir_bh); 1203 if (nfi) { 1204 if (nfibh.sbh != nfibh.ebh) 1205 brelse(nfibh.ebh); 1206 brelse(nfibh.sbh); 1207 } 1208 1209 return retval; 1210 } 1211 1212 static struct dentry *udf_get_parent(struct dentry *child) 1213 { 1214 struct kernel_lb_addr tloc; 1215 struct inode *inode = NULL; 1216 struct qstr dotdot = QSTR_INIT("..", 2); 1217 struct fileIdentDesc cfi; 1218 struct udf_fileident_bh fibh; 1219 1220 if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi)) 1221 return ERR_PTR(-EACCES); 1222 1223 if (fibh.sbh != fibh.ebh) 1224 brelse(fibh.ebh); 1225 brelse(fibh.sbh); 1226 1227 tloc = lelb_to_cpu(cfi.icb.extLocation); 1228 inode = udf_iget(child->d_sb, &tloc); 1229 if (IS_ERR(inode)) 1230 return ERR_CAST(inode); 1231 1232 return d_obtain_alias(inode); 1233 } 1234 1235 1236 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block, 1237 u16 partref, __u32 generation) 1238 { 1239 struct inode *inode; 1240 struct kernel_lb_addr loc; 1241 1242 if (block == 0) 1243 return ERR_PTR(-ESTALE); 1244 1245 loc.logicalBlockNum = block; 1246 loc.partitionReferenceNum = partref; 1247 inode = udf_iget(sb, &loc); 1248 1249 if (IS_ERR(inode)) 1250 return ERR_CAST(inode); 1251 1252 if (generation && inode->i_generation != generation) { 1253 iput(inode); 1254 return ERR_PTR(-ESTALE); 1255 } 1256 return d_obtain_alias(inode); 1257 } 1258 1259 static struct dentry *udf_fh_to_dentry(struct super_block *sb, 1260 struct fid *fid, int fh_len, int fh_type) 1261 { 1262 if (fh_len < 3 || 1263 (fh_type != FILEID_UDF_WITH_PARENT && 1264 fh_type != FILEID_UDF_WITHOUT_PARENT)) 1265 return NULL; 1266 1267 return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref, 1268 fid->udf.generation); 1269 } 1270 1271 static struct dentry *udf_fh_to_parent(struct super_block *sb, 1272 struct fid *fid, int fh_len, int fh_type) 1273 { 1274 if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT) 1275 return NULL; 1276 1277 return udf_nfs_get_inode(sb, fid->udf.parent_block, 1278 fid->udf.parent_partref, 1279 fid->udf.parent_generation); 1280 } 1281 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp, 1282 struct inode *parent) 1283 { 1284 int len = *lenp; 1285 struct kernel_lb_addr location = UDF_I(inode)->i_location; 1286 struct fid *fid = (struct fid *)fh; 1287 int type = FILEID_UDF_WITHOUT_PARENT; 1288 1289 if (parent && (len < 5)) { 1290 *lenp = 5; 1291 return FILEID_INVALID; 1292 } else if (len < 3) { 1293 *lenp = 3; 1294 return FILEID_INVALID; 1295 } 1296 1297 *lenp = 3; 1298 fid->udf.block = location.logicalBlockNum; 1299 fid->udf.partref = location.partitionReferenceNum; 1300 fid->udf.parent_partref = 0; 1301 fid->udf.generation = inode->i_generation; 1302 1303 if (parent) { 1304 location = UDF_I(parent)->i_location; 1305 fid->udf.parent_block = location.logicalBlockNum; 1306 fid->udf.parent_partref = location.partitionReferenceNum; 1307 fid->udf.parent_generation = inode->i_generation; 1308 *lenp = 5; 1309 type = FILEID_UDF_WITH_PARENT; 1310 } 1311 1312 return type; 1313 } 1314 1315 const struct export_operations udf_export_ops = { 1316 .encode_fh = udf_encode_fh, 1317 .fh_to_dentry = udf_fh_to_dentry, 1318 .fh_to_parent = udf_fh_to_parent, 1319 .get_parent = udf_get_parent, 1320 }; 1321 1322 const struct inode_operations udf_dir_inode_operations = { 1323 .lookup = udf_lookup, 1324 .create = udf_create, 1325 .link = udf_link, 1326 .unlink = udf_unlink, 1327 .symlink = udf_symlink, 1328 .mkdir = udf_mkdir, 1329 .rmdir = udf_rmdir, 1330 .mknod = udf_mknod, 1331 .rename = udf_rename, 1332 .tmpfile = udf_tmpfile, 1333 }; 1334