fs/udf/namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * CONTACTS
   8  *      E-mail regarding any portion of the Linux UDF file system should be
   9  *      directed to the development team mailing list (run by majordomo):
  10  *              linux_udf@hpesjro.fc.hp.com
  11  *
  12  * COPYRIGHT
  13  *      This file is distributed under the terms of the GNU General Public
  14  *      License (GPL). Copies of the GPL can be obtained from:
  15  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  16  *      Each contributing author retains all rights to their own work.
  17  *
  18  *  (C) 1998-2004 Ben Fennema
  19  *  (C) 1999-2000 Stelias Computing Inc
  20  *
  21  * HISTORY
  22  *
  23  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  24  *  04/19/99 blf  link, mknod, symlink support
  25  */
  26
  27 #include "udfdecl.h"
  28
  29 #include "udf_i.h"
  30 #include "udf_sb.h"
  31 #include <linux/string.h>
  32 #include <linux/errno.h>
  33 #include <linux/mm.h>
  34 #include <linux/slab.h>
  35 #include <linux/quotaops.h>
  36 #include <linux/smp_lock.h>
  37 #include <linux/buffer_head.h>
  38
  39 static inline int udf_match(int len1, const char *name1, int len2, const char *name2)
  40 {
  41         if (len1 != len2)
  42                 return 0;
  43         return !memcmp(name1, name2, len1);
  44 }
  45
  46 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  47         struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  48         uint8_t *impuse, uint8_t *fileident)
  49 {
  50         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
  51         uint16_t crc;
  52         uint8_t checksum = 0;
  53         int i;
  54         int offset;
  55         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  56         uint8_t lfi = cfi->lengthFileIdent;
  57         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  58                 sizeof(struct fileIdentDesc);
  59         int adinicb = 0;
  60
  61         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
  62                 adinicb = 1;
  63
  64         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  65
  66         if (impuse)
  67         {
  68                 if (adinicb || (offset + liu < 0))
  69                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  70                 else if (offset >= 0)
  71                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  72                 else
  73                 {
  74                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  75                         memcpy(fibh->ebh->b_data, impuse - offset, liu + offset);
  76                 }
  77         }
  78
  79         offset += liu;
  80
  81         if (fileident)
  82         {
  83                 if (adinicb || (offset + lfi < 0))
  84                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  85                 else if (offset >= 0)
  86                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  87                 else
  88                 {
  89                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset);
  90                         memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset);
  91                 }
  92         }
  93
  94         offset += lfi;
  95
  96         if (adinicb || (offset + padlen < 0))
  97                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  98         else if (offset >= 0)
  99                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
 100         else
 101         {
 102                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
 103                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
 104         }
 105
 106         crc = udf_crc((uint8_t *)cfi + sizeof(tag), sizeof(struct fileIdentDesc) -
 107                 sizeof(tag), 0);
 108
 109         if (fibh->sbh == fibh->ebh)
 110                 crc = udf_crc((uint8_t *)sfi->impUse,
 111                         crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
 112         else if (sizeof(struct fileIdentDesc) >= -fibh->soffset)
 113                 crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset,
 114                         crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
 115         else
 116         {
 117                 crc = udf_crc((uint8_t *)sfi->impUse,
 118                         -fibh->soffset - sizeof(struct fileIdentDesc), crc);
 119                 crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
 120         }
 121
 122         cfi->descTag.descCRC = cpu_to_le16(crc);
 123         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 124
 125         for (i=0; i<16; i++)
 126                 if (i != 4)
 127                         checksum += ((uint8_t *)&cfi->descTag)[i];
 128
 129         cfi->descTag.tagChecksum = checksum;
 130         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset))
 131                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc));
 132         else
 133         {
 134                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 135                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 136                         sizeof(struct fileIdentDesc) + fibh->soffset);
 137         }
 138
 139         if (adinicb)
 140                 mark_inode_dirty(inode);
 141         else
 142         {
 143                 if (fibh->sbh != fibh->ebh)
 144                         mark_buffer_dirty_inode(fibh->ebh, inode);
 145                 mark_buffer_dirty_inode(fibh->sbh, inode);
 146         }
 147         return 0;
 148 }
 149
 150 static struct fileIdentDesc *
 151 udf_find_entry(struct inode *dir, struct dentry *dentry,
 152         struct udf_fileident_bh *fibh,
 153         struct fileIdentDesc *cfi)
 154 {
 155         struct fileIdentDesc *fi=NULL;
 156         loff_t f_pos;
 157         int block, flen;
 158         char fname[UDF_NAME_LEN];
 159         char *nameptr;
 160         uint8_t lfi;
 161         uint16_t liu;
 162         loff_t size;
 163         kernel_lb_addr bloc, eloc;
 164         uint32_t extoffset, elen, offset;
 165         struct buffer_head *bh = NULL;
 166
 167         if (!dir)
 168                 return NULL;
 169
 170         size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 171
 172         f_pos = (udf_ext0_offset(dir) >> 2);
 173
 174         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 175         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 176                 fibh->sbh = fibh->ebh = NULL;
 177         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 178                 &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
 179         {
 180                 offset >>= dir->i_sb->s_blocksize_bits;
 181                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 182                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 183                 {
 184                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 185                                 extoffset -= sizeof(short_ad);
 186                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 187                                 extoffset -= sizeof(long_ad);
 188                 }
 189                 else
 190                         offset = 0;
 191
 192                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
 193                 {
 194                         udf_release_data(bh);
 195                         return NULL;
 196                 }
 197         }
 198         else
 199         {
 200                 udf_release_data(bh);
 201                 return NULL;
 202         }
 203
 204         while ( (f_pos < size) )
 205         {
 206                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
 207
 208                 if (!fi)
 209                 {
 210                         if (fibh->sbh != fibh->ebh)
 211                                 udf_release_data(fibh->ebh);
 212                         udf_release_data(fibh->sbh);
 213                         udf_release_data(bh);
 214                         return NULL;
 215                 }
 216
 217                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 218                 lfi = cfi->lengthFileIdent;
 219
 220                 if (fibh->sbh == fibh->ebh)
 221                 {
 222                         nameptr = fi->fileIdent + liu;
 223                 }
 224                 else
 225                 {
 226                         int poffset;    /* Unpaded ending offset */
 227
 228                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 229
 230                         if (poffset >= lfi)
 231                                 nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi);
 232                         else
 233                         {
 234                                 nameptr = fname;
 235                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 236                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 237                         }
 238                 }
 239
 240                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
 241                 {
 242                         if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
 243                                 continue;
 244                 }
 245
 246                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
 247                 {
 248                         if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
 249                                 continue;
 250                 }
 251
 252                 if (!lfi)
 253                         continue;
 254
 255                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)))
 256                 {
 257                         if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
 258                         {
 259                                 udf_release_data(bh);
 260                                 return fi;
 261                         }
 262                 }
 263         }
 264         if (fibh->sbh != fibh->ebh)
 265                 udf_release_data(fibh->ebh);
 266         udf_release_data(fibh->sbh);
 267         udf_release_data(bh);
 268         return NULL;
 269 }
 270
 271 /*
 272  * udf_lookup
 273  *
 274  * PURPOSE
 275  *      Look-up the inode for a given name.
 276  *
 277  * DESCRIPTION
 278  *      Required - lookup_dentry() will return -ENOTDIR if this routine is not
 279  *      available for a directory. The filesystem is useless if this routine is
 280  *      not available for at least the filesystem's root directory.
 281  *
 282  *      This routine is passed an incomplete dentry - it must be completed by
 283  *      calling d_add(dentry, inode). If the name does not exist, then the
 284  *      specified inode must be set to null. An error should only be returned
 285  *      when the lookup fails for a reason other than the name not existing.
 286  *      Note that the directory inode semaphore is held during the call.
 287  *
 288  *      Refer to lookup_dentry() in fs/namei.c
 289  *      lookup_dentry() -> lookup() -> real_lookup() -> .
 290  *
 291  * PRE-CONDITIONS
 292  *      dir                     Pointer to inode of parent directory.
 293  *      dentry                  Pointer to dentry to complete.
 294  *      nd                      Pointer to lookup nameidata
 295  *
 296  * POST-CONDITIONS
 297  *      <return>                Zero on success.
 298  *
 299  * HISTORY
 300  *      July 1, 1997 - Andrew E. Mileski
 301  *      Written, tested, and released.
 302  */
 303
 304 static struct dentry *
 305 udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 306 {
 307         struct inode *inode = NULL;
 308         struct fileIdentDesc cfi, *fi;
 309         struct udf_fileident_bh fibh;
 310
 311         if (dentry->d_name.len > UDF_NAME_LEN-2)
 312                 return ERR_PTR(-ENAMETOOLONG);
 313
 314         lock_kernel();
 315 #ifdef UDF_RECOVERY
 316         /* temporary shorthand for specifying files by inode number */
 317         if (!strncmp(dentry->d_name.name, ".B=", 3) )
 318         {
 319                 kernel_lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) };
 320                 inode = udf_iget(dir->i_sb, lb);
 321                 if (!inode)
 322                 {
 323                         unlock_kernel();
 324                         return ERR_PTR(-EACCES);
 325                 }
 326         }
 327         else
 328 #endif /* UDF_RECOVERY */
 329
 330         if ((fi = udf_find_entry(dir, dentry, &fibh, &cfi)))
 331         {
 332                 if (fibh.sbh != fibh.ebh)
 333                         udf_release_data(fibh.ebh);
 334                 udf_release_data(fibh.sbh);
 335
 336                 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
 337                 if ( !inode )
 338                 {
 339                         unlock_kernel();
 340                         return ERR_PTR(-EACCES);
 341                 }
 342         }
 343         unlock_kernel();
 344         d_add(dentry, inode);
 345         return NULL;
 346 }
 347
 348 static struct fileIdentDesc *
 349 udf_add_entry(struct inode *dir, struct dentry *dentry,
 350         struct udf_fileident_bh *fibh,
 351         struct fileIdentDesc *cfi, int *err)
 352 {
 353         struct super_block *sb;
 354         struct fileIdentDesc *fi=NULL;
 355         char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
 356         int namelen;
 357         loff_t f_pos;
 358         int flen;
 359         char *nameptr;
 360         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 361         int nfidlen;
 362         uint8_t lfi;
 363         uint16_t liu;
 364         int block;
 365         kernel_lb_addr bloc, eloc;
 366         uint32_t extoffset, elen, offset;
 367         struct buffer_head *bh = NULL;
 368
 369         sb = dir->i_sb;
 370
 371         if (dentry)
 372         {
 373                 if (!dentry->d_name.len)
 374                 {
 375                         *err = -EINVAL;
 376                         return NULL;
 377                 }
 378
 379                 if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len)))
 380                 {
 381                         *err = -ENAMETOOLONG;
 382                         return NULL;
 383                 }
 384         }
 385         else
 386                 namelen = 0;
 387
 388         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 389
 390         f_pos = (udf_ext0_offset(dir) >> 2);
 391
 392         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 393         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 394                 fibh->sbh = fibh->ebh = NULL;
 395         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 396                 &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
 397         {
 398                 offset >>= dir->i_sb->s_blocksize_bits;
 399                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 400                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 401                 {
 402                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 403                                 extoffset -= sizeof(short_ad);
 404                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 405                                 extoffset -= sizeof(long_ad);
 406                 }
 407                 else
 408                         offset = 0;
 409
 410                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
 411                 {
 412                         udf_release_data(bh);
 413                         *err = -EIO;
 414                         return NULL;
 415                 }
 416
 417                 block = UDF_I_LOCATION(dir).logicalBlockNum;
 418
 419         }
 420         else
 421         {
 422                 block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
 423                 fibh->sbh = fibh->ebh = NULL;
 424                 fibh->soffset = fibh->eoffset = sb->s_blocksize;
 425                 goto add;
 426         }
 427
 428         while ( (f_pos < size) )
 429         {
 430                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
 431
 432                 if (!fi)
 433                 {
 434                         if (fibh->sbh != fibh->ebh)
 435                                 udf_release_data(fibh->ebh);
 436                         udf_release_data(fibh->sbh);
 437                         udf_release_data(bh);
 438                         *err = -EIO;
 439                         return NULL;
 440                 }
 441
 442                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 443                 lfi = cfi->lengthFileIdent;
 444
 445                 if (fibh->sbh == fibh->ebh)
 446                         nameptr = fi->fileIdent + liu;
 447                 else
 448                 {
 449                         int poffset;    /* Unpaded ending offset */
 450
 451                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 452
 453                         if (poffset >= lfi)
 454                                 nameptr = (char *)(fibh->ebh->b_data + poffset - lfi);
 455                         else
 456                         {
 457                                 nameptr = fname;
 458                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 459                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 460                         }
 461                 }
 462
 463                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
 464                 {
 465                         if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen)
 466                         {
 467                                 udf_release_data(bh);
 468                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 469                                 cfi->fileVersionNum = cpu_to_le16(1);
 470                                 cfi->fileCharacteristics = 0;
 471                                 cfi->lengthFileIdent = namelen;
 472                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 473                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
 474                                         return fi;
 475                                 else
 476                                 {
 477                                         *err = -EIO;
 478                                         return NULL;
 479                                 }
 480                         }
 481                 }
 482
 483                 if (!lfi || !dentry)
 484                         continue;
 485
 486                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) &&
 487                         udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
 488                 {
 489                         if (fibh->sbh != fibh->ebh)
 490                                 udf_release_data(fibh->ebh);
 491                         udf_release_data(fibh->sbh);
 492                         udf_release_data(bh);
 493                         *err = -EEXIST;
 494                         return NULL;
 495                 }
 496         }
 497
 498 add:
 499         f_pos += nfidlen;
 500
 501         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB &&
 502                 sb->s_blocksize - fibh->eoffset < nfidlen)
 503         {
 504                 udf_release_data(bh);
 505                 bh = NULL;
 506                 fibh->soffset -= udf_ext0_offset(dir);
 507                 fibh->eoffset -= udf_ext0_offset(dir);
 508                 f_pos -= (udf_ext0_offset(dir) >> 2);
 509                 if (fibh->sbh != fibh->ebh)
 510                         udf_release_data(fibh->ebh);
 511                 udf_release_data(fibh->sbh);
 512                 if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err)))
 513                         return NULL;
 514                 bloc = UDF_I_LOCATION(dir);
 515                 eloc.logicalBlockNum = block;
 516                 eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 517                 elen = dir->i_sb->s_blocksize;
 518                 extoffset = udf_file_entry_alloc_offset(dir);
 519                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 520                         extoffset += sizeof(short_ad);
 521                 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 522                         extoffset += sizeof(long_ad);
 523         }
 524
 525         if (sb->s_blocksize - fibh->eoffset >= nfidlen)
 526         {
 527                 fibh->soffset = fibh->eoffset;
 528                 fibh->eoffset += nfidlen;
 529                 if (fibh->sbh != fibh->ebh)
 530                 {
 531                         udf_release_data(fibh->sbh);
 532                         fibh->sbh = fibh->ebh;
 533                 }
 534
 535                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 536                 {
 537                         block = UDF_I_LOCATION(dir).logicalBlockNum;
 538                         fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir));
 539                 }
 540                 else
 541                 {
 542                         block = eloc.logicalBlockNum + ((elen - 1) >>
 543                                 dir->i_sb->s_blocksize_bits);
 544                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset);
 545                 }
 546         }
 547         else
 548         {
 549                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 550                 fibh->eoffset += nfidlen - sb->s_blocksize;
 551                 if (fibh->sbh != fibh->ebh)
 552                 {
 553                         udf_release_data(fibh->sbh);
 554                         fibh->sbh = fibh->ebh;
 555                 }
 556
 557                 block = eloc.logicalBlockNum + ((elen - 1) >>
 558                         dir->i_sb->s_blocksize_bits);
 559
 560                 if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err)))
 561                 {
 562                         udf_release_data(bh);
 563                         udf_release_data(fibh->sbh);
 564                         return NULL;
 565                 }
 566
 567                 if (!(fibh->soffset))
 568                 {
 569                         if (udf_next_aext(dir, &bloc, &extoffset, &eloc, &elen, &bh, 1) ==
 570                                 (EXT_RECORDED_ALLOCATED >> 30))
 571                         {
 572                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 573                                         dir->i_sb->s_blocksize_bits);
 574                         }
 575                         else
 576                                 block ++;
 577
 578                         udf_release_data(fibh->sbh);
 579                         fibh->sbh = fibh->ebh;
 580                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 581                 }
 582                 else
 583                 {
 584                         fi = (struct fileIdentDesc *)
 585                                 (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset);
 586                 }
 587         }
 588
 589         memset(cfi, 0, sizeof(struct fileIdentDesc));
 590         if (UDF_SB_UDFREV(sb) >= 0x0200)
 591                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag));
 592         else
 593                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag));
 594         cfi->fileVersionNum = cpu_to_le16(1);
 595         cfi->lengthFileIdent = namelen;
 596         cfi->lengthOfImpUse = cpu_to_le16(0);
 597         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
 598         {
 599                 udf_release_data(bh);
 600                 dir->i_size += nfidlen;
 601                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 602                         UDF_I_LENALLOC(dir) += nfidlen;
 603                 mark_inode_dirty(dir);
 604                 return fi;
 605         }
 606         else
 607         {
 608                 udf_release_data(bh);
 609                 if (fibh->sbh != fibh->ebh)
 610                         udf_release_data(fibh->ebh);
 611                 udf_release_data(fibh->sbh);
 612                 *err = -EIO;
 613                 return NULL;
 614         }
 615 }
 616
 617 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 618         struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi)
 619 {
 620         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 621         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 622                 memset(&(cfi->icb), 0x00, sizeof(long_ad));
 623         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 624 }
 625
 626 static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
 627 {
 628         struct udf_fileident_bh fibh;
 629         struct inode *inode;
 630         struct fileIdentDesc cfi, *fi;
 631         int err;
 632
 633         lock_kernel();
 634         inode = udf_new_inode(dir, mode, &err);
 635         if (!inode)
 636         {
 637                 unlock_kernel();
 638                 return err;
 639         }
 640
 641         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 642                 inode->i_data.a_ops = &udf_adinicb_aops;
 643         else
 644                 inode->i_data.a_ops = &udf_aops;
 645         inode->i_op = &udf_file_inode_operations;
 646         inode->i_fop = &udf_file_operations;
 647         inode->i_mode = mode;
 648         mark_inode_dirty(inode);
 649
 650         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 651         {
 652                 inode->i_nlink --;
 653                 mark_inode_dirty(inode);
 654                 iput(inode);
 655                 unlock_kernel();
 656                 return err;
 657         }
 658         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 659         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 660         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 661                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 662         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 663         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 664         {
 665                 mark_inode_dirty(dir);
 666         }
 667         if (fibh.sbh != fibh.ebh)
 668                 udf_release_data(fibh.ebh);
 669         udf_release_data(fibh.sbh);
 670         unlock_kernel();
 671         d_instantiate(dentry, inode);
 672         return 0;
 673 }
 674
 675 static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev)
 676 {
 677         struct inode * inode;
 678         struct udf_fileident_bh fibh;
 679         struct fileIdentDesc cfi, *fi;
 680         int err;
 681
 682         if (!old_valid_dev(rdev))
 683                 return -EINVAL;
 684
 685         lock_kernel();
 686         err = -EIO;
 687         inode = udf_new_inode(dir, mode, &err);
 688         if (!inode)
 689                 goto out;
 690
 691         inode->i_uid = current->fsuid;
 692         init_special_inode(inode, mode, rdev);
 693         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 694         {
 695                 inode->i_nlink --;
 696                 mark_inode_dirty(inode);
 697                 iput(inode);
 698                 unlock_kernel();
 699                 return err;
 700         }
 701         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 702         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 703         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 704                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 705         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 706         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 707         {
 708                 mark_inode_dirty(dir);
 709         }
 710         mark_inode_dirty(inode);
 711
 712         if (fibh.sbh != fibh.ebh)
 713                 udf_release_data(fibh.ebh);
 714         udf_release_data(fibh.sbh);
 715         d_instantiate(dentry, inode);
 716         err = 0;
 717 out:
 718         unlock_kernel();
 719         return err;
 720 }
 721
 722 static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 723 {
 724         struct inode * inode;
 725         struct udf_fileident_bh fibh;
 726         struct fileIdentDesc cfi, *fi;
 727         int err;
 728
 729         lock_kernel();
 730         err = -EMLINK;
 731         if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1)
 732                 goto out;
 733
 734         err = -EIO;
 735         inode = udf_new_inode(dir, S_IFDIR, &err);
 736         if (!inode)
 737                 goto out;
 738
 739         inode->i_op = &udf_dir_inode_operations;
 740         inode->i_fop = &udf_dir_operations;
 741         if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err)))
 742         {
 743                 inode->i_nlink--;
 744                 mark_inode_dirty(inode);
 745                 iput(inode);
 746                 goto out;
 747         }
 748         inode->i_nlink = 2;
 749         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 750         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir));
 751         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 752                 cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
 753         cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 754         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 755         udf_release_data(fibh.sbh);
 756         inode->i_mode = S_IFDIR | mode;
 757         if (dir->i_mode & S_ISGID)
 758                 inode->i_mode |= S_ISGID;
 759         mark_inode_dirty(inode);
 760
 761         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 762         {
 763                 inode->i_nlink = 0;
 764                 mark_inode_dirty(inode);
 765                 iput(inode);
 766                 goto out;
 767         }
 768         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 769         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 770         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 771                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 772         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 773         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 774         dir->i_nlink++;
 775         mark_inode_dirty(dir);
 776         d_instantiate(dentry, inode);
 777         if (fibh.sbh != fibh.ebh)
 778                 udf_release_data(fibh.ebh);
 779         udf_release_data(fibh.sbh);
 780         err = 0;
 781 out:
 782         unlock_kernel();
 783         return err;
 784 }
 785
 786 static int empty_dir(struct inode *dir)
 787 {
 788         struct fileIdentDesc *fi, cfi;
 789         struct udf_fileident_bh fibh;
 790         loff_t f_pos;
 791         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 792         int block;
 793         kernel_lb_addr bloc, eloc;
 794         uint32_t extoffset, elen, offset;
 795         struct buffer_head *bh = NULL;
 796
 797         f_pos = (udf_ext0_offset(dir) >> 2);
 798
 799         fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 800
 801         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 802                 fibh.sbh = fibh.ebh = NULL;
 803         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 804                 &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
 805         {
 806                 offset >>= dir->i_sb->s_blocksize_bits;
 807                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 808                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 809                 {
 810                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 811                                 extoffset -= sizeof(short_ad);
 812                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 813                                 extoffset -= sizeof(long_ad);
 814                 }
 815                 else
 816                         offset = 0;
 817
 818                 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
 819                 {
 820                         udf_release_data(bh);
 821                         return 0;
 822                 }
 823         }
 824         else
 825         {
 826                 udf_release_data(bh);
 827                 return 0;
 828         }
 829
 830
 831         while ( (f_pos < size) )
 832         {
 833                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
 834
 835                 if (!fi)
 836                 {
 837                         if (fibh.sbh != fibh.ebh)
 838                                 udf_release_data(fibh.ebh);
 839                         udf_release_data(fibh.sbh);
 840                         udf_release_data(bh);
 841                         return 0;
 842                 }
 843
 844                 if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0)
 845                 {
 846                         if (fibh.sbh != fibh.ebh)
 847                                 udf_release_data(fibh.ebh);
 848                         udf_release_data(fibh.sbh);
 849                         udf_release_data(bh);
 850                         return 0;
 851                 }
 852         }
 853         if (fibh.sbh != fibh.ebh)
 854                 udf_release_data(fibh.ebh);
 855         udf_release_data(fibh.sbh);
 856         udf_release_data(bh);
 857         return 1;
 858 }
 859
 860 static int udf_rmdir(struct inode * dir, struct dentry * dentry)
 861 {
 862         int retval;
 863         struct inode * inode = dentry->d_inode;
 864         struct udf_fileident_bh fibh;
 865         struct fileIdentDesc *fi, cfi;
 866         kernel_lb_addr tloc;
 867
 868         retval = -ENOENT;
 869         lock_kernel();
 870         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 871         if (!fi)
 872                 goto out;
 873
 874         retval = -EIO;
 875         tloc = lelb_to_cpu(cfi.icb.extLocation);
 876         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 877                 goto end_rmdir;
 878         retval = -ENOTEMPTY;
 879         if (!empty_dir(inode))
 880                 goto end_rmdir;
 881         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 882         if (retval)
 883                 goto end_rmdir;
 884         if (inode->i_nlink != 2)
 885                 udf_warning(inode->i_sb, "udf_rmdir",
 886                         "empty directory has nlink != 2 (%d)",
 887                         inode->i_nlink);
 888         inode->i_nlink = 0;
 889         inode->i_size = 0;
 890         mark_inode_dirty(inode);
 891         dir->i_nlink --;
 892         inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 893         mark_inode_dirty(dir);
 894
 895 end_rmdir:
 896         if (fibh.sbh != fibh.ebh)
 897                 udf_release_data(fibh.ebh);
 898         udf_release_data(fibh.sbh);
 899 out:
 900         unlock_kernel();
 901         return retval;
 902 }
 903
 904 static int udf_unlink(struct inode * dir, struct dentry * dentry)
 905 {
 906         int retval;
 907         struct inode * inode = dentry->d_inode;
 908         struct udf_fileident_bh fibh;
 909         struct fileIdentDesc *fi;
 910         struct fileIdentDesc cfi;
 911         kernel_lb_addr tloc;
 912
 913         retval = -ENOENT;
 914         lock_kernel();
 915         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 916         if (!fi)
 917                 goto out;
 918
 919         retval = -EIO;
 920         tloc = lelb_to_cpu(cfi.icb.extLocation);
 921         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 922                 goto end_unlink;
 923
 924         if (!inode->i_nlink)
 925         {
 926                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 927                         inode->i_ino, inode->i_nlink);
 928                 inode->i_nlink = 1;
 929         }
 930         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 931         if (retval)
 932                 goto end_unlink;
 933         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 934         mark_inode_dirty(dir);
 935         inode->i_nlink--;
 936         mark_inode_dirty(inode);
 937         inode->i_ctime = dir->i_ctime;
 938         retval = 0;
 939
 940 end_unlink:
 941         if (fibh.sbh != fibh.ebh)
 942                 udf_release_data(fibh.ebh);
 943         udf_release_data(fibh.sbh);
 944 out:
 945         unlock_kernel();
 946         return retval;
 947 }
 948
 949 static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname)
 950 {
 951         struct inode * inode;
 952         struct pathComponent *pc;
 953         char *compstart;
 954         struct udf_fileident_bh fibh;
 955         struct buffer_head *bh = NULL;
 956         int eoffset, elen = 0;
 957         struct fileIdentDesc *fi;
 958         struct fileIdentDesc cfi;
 959         char *ea;
 960         int err;
 961         int block;
 962         char name[UDF_NAME_LEN];
 963         int namelen;
 964
 965         lock_kernel();
 966         if (!(inode = udf_new_inode(dir, S_IFLNK, &err)))
 967                 goto out;
 968
 969         inode->i_mode = S_IFLNK | S_IRWXUGO;
 970         inode->i_data.a_ops = &udf_symlink_aops;
 971         inode->i_op = &page_symlink_inode_operations;
 972
 973         if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB)
 974         {
 975                 struct buffer_head *bh = NULL;
 976                 kernel_lb_addr bloc, eloc;
 977                 uint32_t elen, extoffset;
 978
 979                 block = udf_new_block(inode->i_sb, inode,
 980                         UDF_I_LOCATION(inode).partitionReferenceNum,
 981                         UDF_I_LOCATION(inode).logicalBlockNum, &err);
 982                 if (!block)
 983                         goto out_no_entry;
 984                 bloc = UDF_I_LOCATION(inode);
 985                 eloc.logicalBlockNum = block;
 986                 eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 987                 elen = inode->i_sb->s_blocksize;
 988                 UDF_I_LENEXTENTS(inode) = elen;
 989                 extoffset = udf_file_entry_alloc_offset(inode);
 990                 udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 0);
 991                 udf_release_data(bh);
 992
 993                 block = udf_get_pblock(inode->i_sb, block,
 994                         UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 995                 bh = udf_tread(inode->i_sb, block);
 996                 lock_buffer(bh);
 997                 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 998                 set_buffer_uptodate(bh);
 999                 unlock_buffer(bh);
1000                 mark_buffer_dirty_inode(bh, inode);
1001                 ea = bh->b_data + udf_ext0_offset(inode);
1002         }
1003         else
1004                 ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
1005
1006         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
1007         pc = (struct pathComponent *)ea;
1008
1009         if (*symname == '/')
1010         {
1011                 do
1012                 {
1013                         symname++;
1014                 } while (*symname == '/');
1015
1016                 pc->componentType = 1;
1017                 pc->lengthComponentIdent = 0;
1018                 pc->componentFileVersionNum = 0;
1019                 pc += sizeof(struct pathComponent);
1020                 elen += sizeof(struct pathComponent);
1021         }
1022
1023         err = -ENAMETOOLONG;
1024
1025         while (*symname)
1026         {
1027                 if (elen + sizeof(struct pathComponent) > eoffset)
1028                         goto out_no_entry;
1029
1030                 pc = (struct pathComponent *)(ea + elen);
1031
1032                 compstart = (char *)symname;
1033
1034                 do
1035                 {
1036                         symname++;
1037                 } while (*symname && *symname != '/');
1038
1039                 pc->componentType = 5;
1040                 pc->lengthComponentIdent = 0;
1041                 pc->componentFileVersionNum = 0;
1042                 if (compstart[0] == '.')
1043                 {
1044                         if ((symname-compstart) == 1)
1045                                 pc->componentType = 4;
1046                         else if ((symname-compstart) == 2 && compstart[1] == '.')
1047                                 pc->componentType = 3;
1048                 }
1049
1050                 if (pc->componentType == 5)
1051                 {
1052                         if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart)))
1053                                 goto out_no_entry;
1054
1055                         if (elen + sizeof(struct pathComponent) + namelen > eoffset)
1056                                 goto out_no_entry;
1057                         else
1058                                 pc->lengthComponentIdent = namelen;
1059
1060                         memcpy(pc->componentIdent, name, namelen);
1061                 }
1062
1063                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1064
1065                 if (*symname)
1066                 {
1067                         do
1068                         {
1069                                 symname++;
1070                         } while (*symname == '/');
1071                 }
1072         }
1073
1074         udf_release_data(bh);
1075         inode->i_size = elen;
1076         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1077                 UDF_I_LENALLOC(inode) = inode->i_size;
1078         mark_inode_dirty(inode);
1079
1080         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1081                 goto out_no_entry;
1082         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1083         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1084         if (UDF_SB_LVIDBH(inode->i_sb))
1085         {
1086                 struct logicalVolHeaderDesc *lvhd;
1087                 uint64_t uniqueID;
1088                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1089                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1090                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1091                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1092                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1093                         uniqueID += 16;
1094                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1095                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1096         }
1097         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1098         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1099         {
1100                 mark_inode_dirty(dir);
1101         }
1102         if (fibh.sbh != fibh.ebh)
1103                 udf_release_data(fibh.ebh);
1104         udf_release_data(fibh.sbh);
1105         d_instantiate(dentry, inode);
1106         err = 0;
1107
1108 out:
1109         unlock_kernel();
1110         return err;
1111
1112 out_no_entry:
1113         inode->i_nlink--;
1114         mark_inode_dirty(inode);
1115         iput(inode);
1116         goto out;
1117 }
1118
1119 static int udf_link(struct dentry * old_dentry, struct inode * dir,
1120          struct dentry *dentry)
1121 {
1122         struct inode *inode = old_dentry->d_inode;
1123         struct udf_fileident_bh fibh;
1124         struct fileIdentDesc cfi, *fi;
1125         int err;
1126
1127         lock_kernel();
1128         if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1)
1129         {
1130                 unlock_kernel();
1131                 return -EMLINK;
1132         }
1133
1134         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1135         {
1136                 unlock_kernel();
1137                 return err;
1138         }
1139         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1140         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1141         if (UDF_SB_LVIDBH(inode->i_sb))
1142         {
1143                 struct logicalVolHeaderDesc *lvhd;
1144                 uint64_t uniqueID;
1145                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1146                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1147                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1148                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1149                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1150                         uniqueID += 16;
1151                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1152                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1153         }
1154         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1155         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1156         {
1157                 mark_inode_dirty(dir);
1158         }
1159         if (fibh.sbh != fibh.ebh)
1160                 udf_release_data(fibh.ebh);
1161         udf_release_data(fibh.sbh);
1162         inode->i_nlink ++;
1163         inode->i_ctime = current_fs_time(inode->i_sb);
1164         mark_inode_dirty(inode);
1165         atomic_inc(&inode->i_count);
1166         d_instantiate(dentry, inode);
1167         unlock_kernel();
1168         return 0;
1169 }
1170
1171 /* Anybody can rename anything with this: the permission checks are left to the
1172  * higher-level routines.
1173  */
1174 static int udf_rename (struct inode * old_dir, struct dentry * old_dentry,
1175         struct inode * new_dir, struct dentry * new_dentry)
1176 {
1177         struct inode * old_inode = old_dentry->d_inode;
1178         struct inode * new_inode = new_dentry->d_inode;
1179         struct udf_fileident_bh ofibh, nfibh;
1180         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi;
1181         struct buffer_head *dir_bh = NULL;
1182         int retval = -ENOENT;
1183         kernel_lb_addr tloc;
1184
1185         lock_kernel();
1186         if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi)))
1187         {
1188                 if (ofibh.sbh != ofibh.ebh)
1189                         udf_release_data(ofibh.ebh);
1190                 udf_release_data(ofibh.sbh);
1191         }
1192         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1193         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1194                                         != old_inode->i_ino)
1195                 goto end_rename;
1196
1197         nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1198         if (nfi)
1199         {
1200                 if (!new_inode)
1201                 {
1202                         if (nfibh.sbh != nfibh.ebh)
1203                                 udf_release_data(nfibh.ebh);
1204                         udf_release_data(nfibh.sbh);
1205                         nfi = NULL;
1206                 }
1207         }
1208         if (S_ISDIR(old_inode->i_mode))
1209         {
1210                 uint32_t offset = udf_ext0_offset(old_inode);
1211
1212                 if (new_inode)
1213                 {
1214                         retval = -ENOTEMPTY;
1215                         if (!empty_dir(new_inode))
1216                                 goto end_rename;
1217                 }
1218                 retval = -EIO;
1219                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1220                 {
1221                         dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) -
1222                                 (UDF_I_EFE(old_inode) ?
1223                                         sizeof(struct extendedFileEntry) :
1224                                         sizeof(struct fileEntry)),
1225                                 old_inode->i_sb->s_blocksize, &offset);
1226                 }
1227                 else
1228                 {
1229                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1230                         if (!dir_bh)
1231                                 goto end_rename;
1232                         dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset);
1233                 }
1234                 if (!dir_fi)
1235                         goto end_rename;
1236                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1237                 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0)
1238                                         != old_dir->i_ino)
1239                         goto end_rename;
1240
1241                 retval = -EMLINK;
1242                 if (!new_inode && new_dir->i_nlink >= (256<<sizeof(new_dir->i_nlink))-1)
1243                         goto end_rename;
1244         }
1245         if (!nfi)
1246         {
1247                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval);
1248                 if (!nfi)
1249                         goto end_rename;
1250         }
1251
1252         /*
1253          * Like most other Unix systems, set the ctime for inodes on a
1254          * rename.
1255          */
1256         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1257         mark_inode_dirty(old_inode);
1258
1259         /*
1260          * ok, that's it
1261          */
1262         ncfi.fileVersionNum = ocfi.fileVersionNum;
1263         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1264         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1265         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1266
1267         /* The old fid may have moved - find it again */
1268         ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1269         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1270
1271         if (new_inode)
1272         {
1273                 new_inode->i_nlink--;
1274                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1275                 mark_inode_dirty(new_inode);
1276         }
1277         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1278         mark_inode_dirty(old_dir);
1279
1280         if (dir_fi)
1281         {
1282                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir));
1283                 udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) +
1284                         le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1285                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1286                 {
1287                         mark_inode_dirty(old_inode);
1288                 }
1289                 else
1290                         mark_buffer_dirty_inode(dir_bh, old_inode);
1291                 old_dir->i_nlink --;
1292                 mark_inode_dirty(old_dir);
1293                 if (new_inode)
1294                 {
1295                         new_inode->i_nlink --;
1296                         mark_inode_dirty(new_inode);
1297                 }
1298                 else
1299                 {
1300                         new_dir->i_nlink ++;
1301                         mark_inode_dirty(new_dir);
1302                 }
1303         }
1304
1305         if (ofi)
1306         {
1307                 if (ofibh.sbh != ofibh.ebh)
1308                         udf_release_data(ofibh.ebh);
1309                 udf_release_data(ofibh.sbh);
1310         }
1311
1312         retval = 0;
1313
1314 end_rename:
1315         udf_release_data(dir_bh);
1316         if (nfi)
1317         {
1318                 if (nfibh.sbh != nfibh.ebh)
1319                         udf_release_data(nfibh.ebh);
1320                 udf_release_data(nfibh.sbh);
1321         }
1322         unlock_kernel();
1323         return retval;
1324 }
1325
1326 struct inode_operations udf_dir_inode_operations = {
1327         .lookup                         = udf_lookup,
1328         .create                         = udf_create,
1329         .link                           = udf_link,
1330         .unlink                         = udf_unlink,
1331         .symlink                        = udf_symlink,
1332         .mkdir                          = udf_mkdir,
1333         .rmdir                          = udf_rmdir,
1334         .mknod                          = udf_mknod,
1335         .rename                         = udf_rename,
1336 };