fs/udf/namei.c

   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/quotaops.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/buffer_head.h>
  33 #include <linux/sched.h>
  34
  35 static inline int udf_match(int len1, const char *name1, int len2, const char *name2)
  36 {
  37         if (len1 != len2)
  38                 return 0;
  39         return !memcmp(name1, name2, len1);
  40 }
  41
  42 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  43         struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  44         uint8_t *impuse, uint8_t *fileident)
  45 {
  46         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
  47         uint16_t crc;
  48         uint8_t checksum = 0;
  49         int i;
  50         int offset;
  51         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  52         uint8_t lfi = cfi->lengthFileIdent;
  53         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  54                 sizeof(struct fileIdentDesc);
  55         int adinicb = 0;
  56
  57         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
  58                 adinicb = 1;
  59
  60         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  61
  62         if (impuse)
  63         {
  64                 if (adinicb || (offset + liu < 0))
  65                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  66                 else if (offset >= 0)
  67                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  68                 else
  69                 {
  70                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  71                         memcpy(fibh->ebh->b_data, impuse - offset, liu + offset);
  72                 }
  73         }
  74
  75         offset += liu;
  76
  77         if (fileident)
  78         {
  79                 if (adinicb || (offset + lfi < 0))
  80                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  81                 else if (offset >= 0)
  82                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  83                 else
  84                 {
  85                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset);
  86                         memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset);
  87                 }
  88         }
  89
  90         offset += lfi;
  91
  92         if (adinicb || (offset + padlen < 0))
  93                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  94         else if (offset >= 0)
  95                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  96         else
  97         {
  98                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  99                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
 100         }
 101
 102         crc = udf_crc((uint8_t *)cfi + sizeof(tag), sizeof(struct fileIdentDesc) -
 103                 sizeof(tag), 0);
 104
 105         if (fibh->sbh == fibh->ebh)
 106                 crc = udf_crc((uint8_t *)sfi->impUse,
 107                         crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
 108         else if (sizeof(struct fileIdentDesc) >= -fibh->soffset)
 109                 crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset,
 110                         crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
 111         else
 112         {
 113                 crc = udf_crc((uint8_t *)sfi->impUse,
 114                         -fibh->soffset - sizeof(struct fileIdentDesc), crc);
 115                 crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
 116         }
 117
 118         cfi->descTag.descCRC = cpu_to_le16(crc);
 119         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 120
 121         for (i=0; i<16; i++)
 122                 if (i != 4)
 123                         checksum += ((uint8_t *)&cfi->descTag)[i];
 124
 125         cfi->descTag.tagChecksum = checksum;
 126         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset))
 127                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc));
 128         else
 129         {
 130                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 131                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 132                         sizeof(struct fileIdentDesc) + fibh->soffset);
 133         }
 134
 135         if (adinicb)
 136                 mark_inode_dirty(inode);
 137         else
 138         {
 139                 if (fibh->sbh != fibh->ebh)
 140                         mark_buffer_dirty_inode(fibh->ebh, inode);
 141                 mark_buffer_dirty_inode(fibh->sbh, inode);
 142         }
 143         return 0;
 144 }
 145
 146 static struct fileIdentDesc *
 147 udf_find_entry(struct inode *dir, struct dentry *dentry,
 148         struct udf_fileident_bh *fibh,
 149         struct fileIdentDesc *cfi)
 150 {
 151         struct fileIdentDesc *fi=NULL;
 152         loff_t f_pos;
 153         int block, flen;
 154         char fname[UDF_NAME_LEN];
 155         char *nameptr;
 156         uint8_t lfi;
 157         uint16_t liu;
 158         loff_t size;
 159         kernel_lb_addr eloc;
 160         uint32_t elen;
 161         sector_t offset;
 162         struct extent_position epos = { NULL, 0, { 0, 0}};
 163
 164         size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 165         f_pos = (udf_ext0_offset(dir) >> 2);
 166
 167         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 168         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 169                 fibh->sbh = fibh->ebh = NULL;
 170         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 171                 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
 172         {
 173                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 174                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 175                 {
 176                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 177                                 epos.offset -= sizeof(short_ad);
 178                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 179                                 epos.offset -= sizeof(long_ad);
 180                 }
 181                 else
 182                         offset = 0;
 183
 184                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
 185                 {
 186                         brelse(epos.bh);
 187                         return NULL;
 188                 }
 189         }
 190         else
 191         {
 192                 brelse(epos.bh);
 193                 return NULL;
 194         }
 195
 196         while ( (f_pos < size) )
 197         {
 198                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, &elen, &offset);
 199
 200                 if (!fi)
 201                 {
 202                         if (fibh->sbh != fibh->ebh)
 203                                 brelse(fibh->ebh);
 204                         brelse(fibh->sbh);
 205                         brelse(epos.bh);
 206                         return NULL;
 207                 }
 208
 209                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 210                 lfi = cfi->lengthFileIdent;
 211
 212                 if (fibh->sbh == fibh->ebh)
 213                 {
 214                         nameptr = fi->fileIdent + liu;
 215                 }
 216                 else
 217                 {
 218                         int poffset;    /* Unpaded ending offset */
 219
 220                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 221
 222                         if (poffset >= lfi)
 223                                 nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi);
 224                         else
 225                         {
 226                                 nameptr = fname;
 227                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 228                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 229                         }
 230                 }
 231
 232                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
 233                 {
 234                         if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
 235                                 continue;
 236                 }
 237
 238                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
 239                 {
 240                         if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
 241                                 continue;
 242                 }
 243
 244                 if (!lfi)
 245                         continue;
 246
 247                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)))
 248                 {
 249                         if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
 250                         {
 251                                 brelse(epos.bh);
 252                                 return fi;
 253                         }
 254                 }
 255         }
 256         if (fibh->sbh != fibh->ebh)
 257                 brelse(fibh->ebh);
 258         brelse(fibh->sbh);
 259         brelse(epos.bh);
 260         return NULL;
 261 }
 262
 263 /*
 264  * udf_lookup
 265  *
 266  * PURPOSE
 267  *      Look-up the inode for a given name.
 268  *
 269  * DESCRIPTION
 270  *      Required - lookup_dentry() will return -ENOTDIR if this routine is not
 271  *      available for a directory. The filesystem is useless if this routine is
 272  *      not available for at least the filesystem's root directory.
 273  *
 274  *      This routine is passed an incomplete dentry - it must be completed by
 275  *      calling d_add(dentry, inode). If the name does not exist, then the
 276  *      specified inode must be set to null. An error should only be returned
 277  *      when the lookup fails for a reason other than the name not existing.
 278  *      Note that the directory inode semaphore is held during the call.
 279  *
 280  *      Refer to lookup_dentry() in fs/namei.c
 281  *      lookup_dentry() -> lookup() -> real_lookup() -> .
 282  *
 283  * PRE-CONDITIONS
 284  *      dir                     Pointer to inode of parent directory.
 285  *      dentry                  Pointer to dentry to complete.
 286  *      nd                      Pointer to lookup nameidata
 287  *
 288  * POST-CONDITIONS
 289  *      <return>                Zero on success.
 290  *
 291  * HISTORY
 292  *      July 1, 1997 - Andrew E. Mileski
 293  *      Written, tested, and released.
 294  */
 295
 296 static struct dentry *
 297 udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 298 {
 299         struct inode *inode = NULL;
 300         struct fileIdentDesc cfi;
 301         struct udf_fileident_bh fibh;
 302
 303         if (dentry->d_name.len > UDF_NAME_LEN-2)
 304                 return ERR_PTR(-ENAMETOOLONG);
 305
 306         lock_kernel();
 307 #ifdef UDF_RECOVERY
 308         /* temporary shorthand for specifying files by inode number */
 309         if (!strncmp(dentry->d_name.name, ".B=", 3) )
 310         {
 311                 kernel_lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) };
 312                 inode = udf_iget(dir->i_sb, lb);
 313                 if (!inode)
 314                 {
 315                         unlock_kernel();
 316                         return ERR_PTR(-EACCES);
 317                 }
 318         }
 319         else
 320 #endif /* UDF_RECOVERY */
 321
 322         if (udf_find_entry(dir, dentry, &fibh, &cfi))
 323         {
 324                 if (fibh.sbh != fibh.ebh)
 325                         brelse(fibh.ebh);
 326                 brelse(fibh.sbh);
 327
 328                 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
 329                 if ( !inode )
 330                 {
 331                         unlock_kernel();
 332                         return ERR_PTR(-EACCES);
 333                 }
 334         }
 335         unlock_kernel();
 336         d_add(dentry, inode);
 337         return NULL;
 338 }
 339
 340 static struct fileIdentDesc *
 341 udf_add_entry(struct inode *dir, struct dentry *dentry,
 342         struct udf_fileident_bh *fibh,
 343         struct fileIdentDesc *cfi, int *err)
 344 {
 345         struct super_block *sb;
 346         struct fileIdentDesc *fi=NULL;
 347         char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
 348         int namelen;
 349         loff_t f_pos;
 350         int flen;
 351         char *nameptr;
 352         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 353         int nfidlen;
 354         uint8_t lfi;
 355         uint16_t liu;
 356         int block;
 357         kernel_lb_addr eloc;
 358         uint32_t elen;
 359         sector_t offset;
 360         struct extent_position epos = { NULL, 0, { 0, 0 }};
 361
 362         sb = dir->i_sb;
 363
 364         if (dentry)
 365         {
 366                 if (!dentry->d_name.len)
 367                 {
 368                         *err = -EINVAL;
 369                         return NULL;
 370                 }
 371
 372                 if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len)))
 373                 {
 374                         *err = -ENAMETOOLONG;
 375                         return NULL;
 376                 }
 377         }
 378         else
 379                 namelen = 0;
 380
 381         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 382
 383         f_pos = (udf_ext0_offset(dir) >> 2);
 384
 385         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 386         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 387                 fibh->sbh = fibh->ebh = NULL;
 388         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 389                 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
 390         {
 391                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 392                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 393                 {
 394                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 395                                 epos.offset -= sizeof(short_ad);
 396                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 397                                 epos.offset -= sizeof(long_ad);
 398                 }
 399                 else
 400                         offset = 0;
 401
 402                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
 403                 {
 404                         brelse(epos.bh);
 405                         *err = -EIO;
 406                         return NULL;
 407                 }
 408
 409                 block = UDF_I_LOCATION(dir).logicalBlockNum;
 410
 411         }
 412         else
 413         {
 414                 block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
 415                 fibh->sbh = fibh->ebh = NULL;
 416                 fibh->soffset = fibh->eoffset = sb->s_blocksize;
 417                 goto add;
 418         }
 419
 420         while ( (f_pos < size) )
 421         {
 422                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc, &elen, &offset);
 423
 424                 if (!fi)
 425                 {
 426                         if (fibh->sbh != fibh->ebh)
 427                                 brelse(fibh->ebh);
 428                         brelse(fibh->sbh);
 429                         brelse(epos.bh);
 430                         *err = -EIO;
 431                         return NULL;
 432                 }
 433
 434                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 435                 lfi = cfi->lengthFileIdent;
 436
 437                 if (fibh->sbh == fibh->ebh)
 438                         nameptr = fi->fileIdent + liu;
 439                 else
 440                 {
 441                         int poffset;    /* Unpaded ending offset */
 442
 443                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 444
 445                         if (poffset >= lfi)
 446                                 nameptr = (char *)(fibh->ebh->b_data + poffset - lfi);
 447                         else
 448                         {
 449                                 nameptr = fname;
 450                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 451                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 452                         }
 453                 }
 454
 455                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
 456                 {
 457                         if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen)
 458                         {
 459                                 brelse(epos.bh);
 460                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 461                                 cfi->fileVersionNum = cpu_to_le16(1);
 462                                 cfi->fileCharacteristics = 0;
 463                                 cfi->lengthFileIdent = namelen;
 464                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 465                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
 466                                         return fi;
 467                                 else
 468                                 {
 469                                         *err = -EIO;
 470                                         return NULL;
 471                                 }
 472                         }
 473                 }
 474
 475                 if (!lfi || !dentry)
 476                         continue;
 477
 478                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) &&
 479                         udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
 480                 {
 481                         if (fibh->sbh != fibh->ebh)
 482                                 brelse(fibh->ebh);
 483                         brelse(fibh->sbh);
 484                         brelse(epos.bh);
 485                         *err = -EEXIST;
 486                         return NULL;
 487                 }
 488         }
 489
 490 add:
 491         f_pos += nfidlen;
 492
 493         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB &&
 494                 sb->s_blocksize - fibh->eoffset < nfidlen)
 495         {
 496                 brelse(epos.bh);
 497                 epos.bh = NULL;
 498                 fibh->soffset -= udf_ext0_offset(dir);
 499                 fibh->eoffset -= udf_ext0_offset(dir);
 500                 f_pos -= (udf_ext0_offset(dir) >> 2);
 501                 if (fibh->sbh != fibh->ebh)
 502                         brelse(fibh->ebh);
 503                 brelse(fibh->sbh);
 504                 if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err)))
 505                         return NULL;
 506                 epos.block = UDF_I_LOCATION(dir);
 507                 eloc.logicalBlockNum = block;
 508                 eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 509                 elen = dir->i_sb->s_blocksize;
 510                 epos.offset = udf_file_entry_alloc_offset(dir);
 511                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 512                         epos.offset += sizeof(short_ad);
 513                 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 514                         epos.offset += sizeof(long_ad);
 515         }
 516
 517         if (sb->s_blocksize - fibh->eoffset >= nfidlen)
 518         {
 519                 fibh->soffset = fibh->eoffset;
 520                 fibh->eoffset += nfidlen;
 521                 if (fibh->sbh != fibh->ebh)
 522                 {
 523                         brelse(fibh->sbh);
 524                         fibh->sbh = fibh->ebh;
 525                 }
 526
 527                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 528                 {
 529                         block = UDF_I_LOCATION(dir).logicalBlockNum;
 530                         fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir));
 531                 }
 532                 else
 533                 {
 534                         block = eloc.logicalBlockNum + ((elen - 1) >>
 535                                 dir->i_sb->s_blocksize_bits);
 536                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset);
 537                 }
 538         }
 539         else
 540         {
 541                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 542                 fibh->eoffset += nfidlen - sb->s_blocksize;
 543                 if (fibh->sbh != fibh->ebh)
 544                 {
 545                         brelse(fibh->sbh);
 546                         fibh->sbh = fibh->ebh;
 547                 }
 548
 549                 block = eloc.logicalBlockNum + ((elen - 1) >>
 550                         dir->i_sb->s_blocksize_bits);
 551
 552                 if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err)))
 553                 {
 554                         brelse(epos.bh);
 555                         brelse(fibh->sbh);
 556                         return NULL;
 557                 }
 558
 559                 if (!(fibh->soffset))
 560                 {
 561                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 562                                 (EXT_RECORDED_ALLOCATED >> 30))
 563                         {
 564                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 565                                         dir->i_sb->s_blocksize_bits);
 566                         }
 567                         else
 568                                 block ++;
 569
 570                         brelse(fibh->sbh);
 571                         fibh->sbh = fibh->ebh;
 572                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 573                 }
 574                 else
 575                 {
 576                         fi = (struct fileIdentDesc *)
 577                                 (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset);
 578                 }
 579         }
 580
 581         memset(cfi, 0, sizeof(struct fileIdentDesc));
 582         if (UDF_SB_UDFREV(sb) >= 0x0200)
 583                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag));
 584         else
 585                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag));
 586         cfi->fileVersionNum = cpu_to_le16(1);
 587         cfi->lengthFileIdent = namelen;
 588         cfi->lengthOfImpUse = cpu_to_le16(0);
 589         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
 590         {
 591                 brelse(epos.bh);
 592                 dir->i_size += nfidlen;
 593                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 594                         UDF_I_LENALLOC(dir) += nfidlen;
 595                 mark_inode_dirty(dir);
 596                 return fi;
 597         }
 598         else
 599         {
 600                 brelse(epos.bh);
 601                 if (fibh->sbh != fibh->ebh)
 602                         brelse(fibh->ebh);
 603                 brelse(fibh->sbh);
 604                 *err = -EIO;
 605                 return NULL;
 606         }
 607 }
 608
 609 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 610         struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi)
 611 {
 612         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 613         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 614                 memset(&(cfi->icb), 0x00, sizeof(long_ad));
 615         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 616 }
 617
 618 static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
 619 {
 620         struct udf_fileident_bh fibh;
 621         struct inode *inode;
 622         struct fileIdentDesc cfi, *fi;
 623         int err;
 624
 625         lock_kernel();
 626         inode = udf_new_inode(dir, mode, &err);
 627         if (!inode)
 628         {
 629                 unlock_kernel();
 630                 return err;
 631         }
 632
 633         if (UDF_I_ALLOCTYPE(inode) == 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         inode->i_mode = mode;
 640         mark_inode_dirty(inode);
 641
 642         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 643         {
 644                 inode->i_nlink --;
 645                 mark_inode_dirty(inode);
 646                 iput(inode);
 647                 unlock_kernel();
 648                 return err;
 649         }
 650         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 651         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 652         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 653                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 654         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 655         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 656         {
 657                 mark_inode_dirty(dir);
 658         }
 659         if (fibh.sbh != fibh.ebh)
 660                 brelse(fibh.ebh);
 661         brelse(fibh.sbh);
 662         unlock_kernel();
 663         d_instantiate(dentry, inode);
 664         return 0;
 665 }
 666
 667 static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev)
 668 {
 669         struct inode * inode;
 670         struct udf_fileident_bh fibh;
 671         struct fileIdentDesc cfi, *fi;
 672         int err;
 673
 674         if (!old_valid_dev(rdev))
 675                 return -EINVAL;
 676
 677         lock_kernel();
 678         err = -EIO;
 679         inode = udf_new_inode(dir, mode, &err);
 680         if (!inode)
 681                 goto out;
 682
 683         inode->i_uid = current->fsuid;
 684         init_special_inode(inode, mode, rdev);
 685         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 686         {
 687                 inode->i_nlink --;
 688                 mark_inode_dirty(inode);
 689                 iput(inode);
 690                 unlock_kernel();
 691                 return err;
 692         }
 693         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 694         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 695         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 696                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 697         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 698         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 699         {
 700                 mark_inode_dirty(dir);
 701         }
 702         mark_inode_dirty(inode);
 703
 704         if (fibh.sbh != fibh.ebh)
 705                 brelse(fibh.ebh);
 706         brelse(fibh.sbh);
 707         d_instantiate(dentry, inode);
 708         err = 0;
 709 out:
 710         unlock_kernel();
 711         return err;
 712 }
 713
 714 static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 715 {
 716         struct inode * inode;
 717         struct udf_fileident_bh fibh;
 718         struct fileIdentDesc cfi, *fi;
 719         int err;
 720
 721         lock_kernel();
 722         err = -EMLINK;
 723         if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1)
 724                 goto out;
 725
 726         err = -EIO;
 727         inode = udf_new_inode(dir, S_IFDIR, &err);
 728         if (!inode)
 729                 goto out;
 730
 731         inode->i_op = &udf_dir_inode_operations;
 732         inode->i_fop = &udf_dir_operations;
 733         if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err)))
 734         {
 735                 inode->i_nlink--;
 736                 mark_inode_dirty(inode);
 737                 iput(inode);
 738                 goto out;
 739         }
 740         inode->i_nlink = 2;
 741         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 742         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir));
 743         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 744                 cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
 745         cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 746         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 747         brelse(fibh.sbh);
 748         inode->i_mode = S_IFDIR | mode;
 749         if (dir->i_mode & S_ISGID)
 750                 inode->i_mode |= S_ISGID;
 751         mark_inode_dirty(inode);
 752
 753         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 754         {
 755                 inode->i_nlink = 0;
 756                 mark_inode_dirty(inode);
 757                 iput(inode);
 758                 goto out;
 759         }
 760         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 761         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 762         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 763                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 764         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 765         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 766         inc_nlink(dir);
 767         mark_inode_dirty(dir);
 768         d_instantiate(dentry, inode);
 769         if (fibh.sbh != fibh.ebh)
 770                 brelse(fibh.ebh);
 771         brelse(fibh.sbh);
 772         err = 0;
 773 out:
 774         unlock_kernel();
 775         return err;
 776 }
 777
 778 static int empty_dir(struct inode *dir)
 779 {
 780         struct fileIdentDesc *fi, cfi;
 781         struct udf_fileident_bh fibh;
 782         loff_t f_pos;
 783         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 784         int block;
 785         kernel_lb_addr eloc;
 786         uint32_t elen;
 787         sector_t offset;
 788         struct extent_position epos = { NULL, 0, { 0, 0}};
 789
 790         f_pos = (udf_ext0_offset(dir) >> 2);
 791
 792         fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 793
 794         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 795                 fibh.sbh = fibh.ebh = NULL;
 796         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 797                 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30))
 798         {
 799                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 800                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 801                 {
 802                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 803                                 epos.offset -= sizeof(short_ad);
 804                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 805                                 epos.offset -= sizeof(long_ad);
 806                 }
 807                 else
 808                         offset = 0;
 809
 810                 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
 811                 {
 812                         brelse(epos.bh);
 813                         return 0;
 814                 }
 815         }
 816         else
 817         {
 818                 brelse(epos.bh);
 819                 return 0;
 820         }
 821
 822
 823         while ( (f_pos < size) )
 824         {
 825                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc, &elen, &offset);
 826
 827                 if (!fi)
 828                 {
 829                         if (fibh.sbh != fibh.ebh)
 830                                 brelse(fibh.ebh);
 831                         brelse(fibh.sbh);
 832                         brelse(epos.bh);
 833                         return 0;
 834                 }
 835
 836                 if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0)
 837                 {
 838                         if (fibh.sbh != fibh.ebh)
 839                                 brelse(fibh.ebh);
 840                         brelse(fibh.sbh);
 841                         brelse(epos.bh);
 842                         return 0;
 843                 }
 844         }
 845         if (fibh.sbh != fibh.ebh)
 846                 brelse(fibh.ebh);
 847         brelse(fibh.sbh);
 848         brelse(epos.bh);
 849         return 1;
 850 }
 851
 852 static int udf_rmdir(struct inode * dir, struct dentry * dentry)
 853 {
 854         int retval;
 855         struct inode * inode = dentry->d_inode;
 856         struct udf_fileident_bh fibh;
 857         struct fileIdentDesc *fi, cfi;
 858         kernel_lb_addr tloc;
 859
 860         retval = -ENOENT;
 861         lock_kernel();
 862         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 863         if (!fi)
 864                 goto out;
 865
 866         retval = -EIO;
 867         tloc = lelb_to_cpu(cfi.icb.extLocation);
 868         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 869                 goto end_rmdir;
 870         retval = -ENOTEMPTY;
 871         if (!empty_dir(inode))
 872                 goto end_rmdir;
 873         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 874         if (retval)
 875                 goto end_rmdir;
 876         if (inode->i_nlink != 2)
 877                 udf_warning(inode->i_sb, "udf_rmdir",
 878                         "empty directory has nlink != 2 (%d)",
 879                         inode->i_nlink);
 880         clear_nlink(inode);
 881         inode->i_size = 0;
 882         inode_dec_link_count(dir);
 883         inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 884         mark_inode_dirty(dir);
 885
 886 end_rmdir:
 887         if (fibh.sbh != fibh.ebh)
 888                 brelse(fibh.ebh);
 889         brelse(fibh.sbh);
 890 out:
 891         unlock_kernel();
 892         return retval;
 893 }
 894
 895 static int udf_unlink(struct inode * dir, struct dentry * dentry)
 896 {
 897         int retval;
 898         struct inode * inode = dentry->d_inode;
 899         struct udf_fileident_bh fibh;
 900         struct fileIdentDesc *fi;
 901         struct fileIdentDesc cfi;
 902         kernel_lb_addr tloc;
 903
 904         retval = -ENOENT;
 905         lock_kernel();
 906         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 907         if (!fi)
 908                 goto out;
 909
 910         retval = -EIO;
 911         tloc = lelb_to_cpu(cfi.icb.extLocation);
 912         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 913                 goto end_unlink;
 914
 915         if (!inode->i_nlink)
 916         {
 917                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 918                         inode->i_ino, inode->i_nlink);
 919                 inode->i_nlink = 1;
 920         }
 921         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 922         if (retval)
 923                 goto end_unlink;
 924         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 925         mark_inode_dirty(dir);
 926         inode_dec_link_count(inode);
 927         inode->i_ctime = dir->i_ctime;
 928         retval = 0;
 929
 930 end_unlink:
 931         if (fibh.sbh != fibh.ebh)
 932                 brelse(fibh.ebh);
 933         brelse(fibh.sbh);
 934 out:
 935         unlock_kernel();
 936         return retval;
 937 }
 938
 939 static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname)
 940 {
 941         struct inode * inode;
 942         struct pathComponent *pc;
 943         char *compstart;
 944         struct udf_fileident_bh fibh;
 945         struct extent_position epos = { NULL,  0, {0, 0}};
 946         int eoffset, elen = 0;
 947         struct fileIdentDesc *fi;
 948         struct fileIdentDesc cfi;
 949         char *ea;
 950         int err;
 951         int block;
 952         char name[UDF_NAME_LEN];
 953         int namelen;
 954
 955         lock_kernel();
 956         if (!(inode = udf_new_inode(dir, S_IFLNK, &err)))
 957                 goto out;
 958
 959         inode->i_mode = S_IFLNK | S_IRWXUGO;
 960         inode->i_data.a_ops = &udf_symlink_aops;
 961         inode->i_op = &page_symlink_inode_operations;
 962
 963         if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB)
 964         {
 965                 kernel_lb_addr eloc;
 966                 uint32_t elen;
 967
 968                 block = udf_new_block(inode->i_sb, inode,
 969                         UDF_I_LOCATION(inode).partitionReferenceNum,
 970                         UDF_I_LOCATION(inode).logicalBlockNum, &err);
 971                 if (!block)
 972                         goto out_no_entry;
 973                 epos.block = UDF_I_LOCATION(inode);
 974                 epos.offset = udf_file_entry_alloc_offset(inode);
 975                 epos.bh = NULL;
 976                 eloc.logicalBlockNum = block;
 977                 eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 978                 elen = inode->i_sb->s_blocksize;
 979                 UDF_I_LENEXTENTS(inode) = elen;
 980                 udf_add_aext(inode, &epos, eloc, elen, 0);
 981                 brelse(epos.bh);
 982
 983                 block = udf_get_pblock(inode->i_sb, block,
 984                         UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 985                 epos.bh = udf_tread(inode->i_sb, block);
 986                 lock_buffer(epos.bh);
 987                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
 988                 set_buffer_uptodate(epos.bh);
 989                 unlock_buffer(epos.bh);
 990                 mark_buffer_dirty_inode(epos.bh, inode);
 991                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 992         }
 993         else
 994                 ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
 995
 996         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
 997         pc = (struct pathComponent *)ea;
 998
 999         if (*symname == '/')
1000         {
1001                 do
1002                 {
1003                         symname++;
1004                 } while (*symname == '/');
1005
1006                 pc->componentType = 1;
1007                 pc->lengthComponentIdent = 0;
1008                 pc->componentFileVersionNum = 0;
1009                 pc += sizeof(struct pathComponent);
1010                 elen += sizeof(struct pathComponent);
1011         }
1012
1013         err = -ENAMETOOLONG;
1014
1015         while (*symname)
1016         {
1017                 if (elen + sizeof(struct pathComponent) > eoffset)
1018                         goto out_no_entry;
1019
1020                 pc = (struct pathComponent *)(ea + elen);
1021
1022                 compstart = (char *)symname;
1023
1024                 do
1025                 {
1026                         symname++;
1027                 } while (*symname && *symname != '/');
1028
1029                 pc->componentType = 5;
1030                 pc->lengthComponentIdent = 0;
1031                 pc->componentFileVersionNum = 0;
1032                 if (compstart[0] == '.')
1033                 {
1034                         if ((symname-compstart) == 1)
1035                                 pc->componentType = 4;
1036                         else if ((symname-compstart) == 2 && compstart[1] == '.')
1037                                 pc->componentType = 3;
1038                 }
1039
1040                 if (pc->componentType == 5)
1041                 {
1042                         if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart)))
1043                                 goto out_no_entry;
1044
1045                         if (elen + sizeof(struct pathComponent) + namelen > eoffset)
1046                                 goto out_no_entry;
1047                         else
1048                                 pc->lengthComponentIdent = namelen;
1049
1050                         memcpy(pc->componentIdent, name, namelen);
1051                 }
1052
1053                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1054
1055                 if (*symname)
1056                 {
1057                         do
1058                         {
1059                                 symname++;
1060                         } while (*symname == '/');
1061                 }
1062         }
1063
1064         brelse(epos.bh);
1065         inode->i_size = elen;
1066         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1067                 UDF_I_LENALLOC(inode) = inode->i_size;
1068         mark_inode_dirty(inode);
1069
1070         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1071                 goto out_no_entry;
1072         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1073         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1074         if (UDF_SB_LVIDBH(inode->i_sb))
1075         {
1076                 struct logicalVolHeaderDesc *lvhd;
1077                 uint64_t uniqueID;
1078                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1079                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1080                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1081                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1082                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1083                         uniqueID += 16;
1084                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1085                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1086         }
1087         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1088         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1089         {
1090                 mark_inode_dirty(dir);
1091         }
1092         if (fibh.sbh != fibh.ebh)
1093                 brelse(fibh.ebh);
1094         brelse(fibh.sbh);
1095         d_instantiate(dentry, inode);
1096         err = 0;
1097
1098 out:
1099         unlock_kernel();
1100         return err;
1101
1102 out_no_entry:
1103         inode_dec_link_count(inode);
1104         iput(inode);
1105         goto out;
1106 }
1107
1108 static int udf_link(struct dentry * old_dentry, struct inode * dir,
1109          struct dentry *dentry)
1110 {
1111         struct inode *inode = old_dentry->d_inode;
1112         struct udf_fileident_bh fibh;
1113         struct fileIdentDesc cfi, *fi;
1114         int err;
1115
1116         lock_kernel();
1117         if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1)
1118         {
1119                 unlock_kernel();
1120                 return -EMLINK;
1121         }
1122
1123         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1124         {
1125                 unlock_kernel();
1126                 return err;
1127         }
1128         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1129         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1130         if (UDF_SB_LVIDBH(inode->i_sb))
1131         {
1132                 struct logicalVolHeaderDesc *lvhd;
1133                 uint64_t uniqueID;
1134                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1135                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1136                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1137                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1138                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1139                         uniqueID += 16;
1140                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1141                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1142         }
1143         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1144         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1145         {
1146                 mark_inode_dirty(dir);
1147         }
1148         if (fibh.sbh != fibh.ebh)
1149                 brelse(fibh.ebh);
1150         brelse(fibh.sbh);
1151         inc_nlink(inode);
1152         inode->i_ctime = current_fs_time(inode->i_sb);
1153         mark_inode_dirty(inode);
1154         atomic_inc(&inode->i_count);
1155         d_instantiate(dentry, inode);
1156         unlock_kernel();
1157         return 0;
1158 }
1159
1160 /* Anybody can rename anything with this: the permission checks are left to the
1161  * higher-level routines.
1162  */
1163 static int udf_rename (struct inode * old_dir, struct dentry * old_dentry,
1164         struct inode * new_dir, struct dentry * new_dentry)
1165 {
1166         struct inode * old_inode = old_dentry->d_inode;
1167         struct inode * new_inode = new_dentry->d_inode;
1168         struct udf_fileident_bh ofibh, nfibh;
1169         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi;
1170         struct buffer_head *dir_bh = NULL;
1171         int retval = -ENOENT;
1172         kernel_lb_addr tloc;
1173
1174         lock_kernel();
1175         if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi)))
1176         {
1177                 if (ofibh.sbh != ofibh.ebh)
1178                         brelse(ofibh.ebh);
1179                 brelse(ofibh.sbh);
1180         }
1181         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1182         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1183                                         != old_inode->i_ino)
1184                 goto end_rename;
1185
1186         nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1187         if (nfi)
1188         {
1189                 if (!new_inode)
1190                 {
1191                         if (nfibh.sbh != nfibh.ebh)
1192                                 brelse(nfibh.ebh);
1193                         brelse(nfibh.sbh);
1194                         nfi = NULL;
1195                 }
1196         }
1197         if (S_ISDIR(old_inode->i_mode))
1198         {
1199                 uint32_t offset = udf_ext0_offset(old_inode);
1200
1201                 if (new_inode)
1202                 {
1203                         retval = -ENOTEMPTY;
1204                         if (!empty_dir(new_inode))
1205                                 goto end_rename;
1206                 }
1207                 retval = -EIO;
1208                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1209                 {
1210                         dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) -
1211                                 (UDF_I_EFE(old_inode) ?
1212                                         sizeof(struct extendedFileEntry) :
1213                                         sizeof(struct fileEntry)),
1214                                 old_inode->i_sb->s_blocksize, &offset);
1215                 }
1216                 else
1217                 {
1218                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1219                         if (!dir_bh)
1220                                 goto end_rename;
1221                         dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset);
1222                 }
1223                 if (!dir_fi)
1224                         goto end_rename;
1225                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1226                 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0)
1227                                         != old_dir->i_ino)
1228                         goto end_rename;
1229
1230                 retval = -EMLINK;
1231                 if (!new_inode && new_dir->i_nlink >= (256<<sizeof(new_dir->i_nlink))-1)
1232                         goto end_rename;
1233         }
1234         if (!nfi)
1235         {
1236                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval);
1237                 if (!nfi)
1238                         goto end_rename;
1239         }
1240
1241         /*
1242          * Like most other Unix systems, set the ctime for inodes on a
1243          * rename.
1244          */
1245         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1246         mark_inode_dirty(old_inode);
1247
1248         /*
1249          * ok, that's it
1250          */
1251         ncfi.fileVersionNum = ocfi.fileVersionNum;
1252         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1253         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1254         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1255
1256         /* The old fid may have moved - find it again */
1257         ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1258         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1259
1260         if (new_inode)
1261         {
1262                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1263                 inode_dec_link_count(new_inode);
1264         }
1265         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1266         mark_inode_dirty(old_dir);
1267
1268         if (dir_fi)
1269         {
1270                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir));
1271                 udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) +
1272                         le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1273                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1274                 {
1275                         mark_inode_dirty(old_inode);
1276                 }
1277                 else
1278                         mark_buffer_dirty_inode(dir_bh, old_inode);
1279                 inode_dec_link_count(old_dir);
1280                 if (new_inode)
1281                 {
1282                         inode_dec_link_count(new_inode);
1283                 }
1284                 else
1285                 {
1286                         inc_nlink(new_dir);
1287                         mark_inode_dirty(new_dir);
1288                 }
1289         }
1290
1291         if (ofi)
1292         {
1293                 if (ofibh.sbh != ofibh.ebh)
1294                         brelse(ofibh.ebh);
1295                 brelse(ofibh.sbh);
1296         }
1297
1298         retval = 0;
1299
1300 end_rename:
1301         brelse(dir_bh);
1302         if (nfi)
1303         {
1304                 if (nfibh.sbh != nfibh.ebh)
1305                         brelse(nfibh.ebh);
1306                 brelse(nfibh.sbh);
1307         }
1308         unlock_kernel();
1309         return retval;
1310 }
1311
1312 const struct inode_operations udf_dir_inode_operations = {
1313         .lookup                         = udf_lookup,
1314         .create                         = udf_create,
1315         .link                           = udf_link,
1316         .unlink                         = udf_unlink,
1317         .symlink                        = udf_symlink,
1318         .mkdir                          = udf_mkdir,
1319         .rmdir                          = udf_rmdir,
1320         .mknod                          = udf_mknod,
1321         .rename                         = udf_rename,
1322 };