git.oblomov.eu Git - linux-2.6/blob - 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,
  36                             const char *name2)
  37 {
  38         if (len1 != len2)
  39                 return 0;
  40
  41         return !memcmp(name1, name2, len1);
  42 }
  43
  44 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  45                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  46                  uint8_t * impuse, uint8_t * fileident)
  47 {
  48         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
  49         uint16_t crc;
  50         uint8_t checksum = 0;
  51         int i;
  52         int offset;
  53         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  54         uint8_t lfi = cfi->lengthFileIdent;
  55         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  56                 sizeof(struct fileIdentDesc);
  57         int adinicb = 0;
  58
  59         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
  60                 adinicb = 1;
  61
  62         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  63
  64         if (impuse) {
  65                 if (adinicb || (offset + liu < 0)) {
  66                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  67                 } else if (offset >= 0) {
  68                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  69                 } else {
  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                 if (adinicb || (offset + lfi < 0)) {
  79                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  80                 } else if (offset >= 0) {
  81                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  82                 } else {
  83                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset);
  84                         memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset);
  85                 }
  86         }
  87
  88         offset += lfi;
  89
  90         if (adinicb || (offset + padlen < 0)) {
  91                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  92         } else if (offset >= 0) {
  93                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  94         } else {
  95                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  96                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  97         }
  98
  99         crc = udf_crc((uint8_t *)cfi + sizeof(tag),
 100                       sizeof(struct fileIdentDesc) - sizeof(tag), 0);
 101
 102         if (fibh->sbh == fibh->ebh) {
 103                 crc = udf_crc((uint8_t *)sfi->impUse,
 104                               crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
 105         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 106                 crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset,
 107                               crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
 108         } else {
 109                 crc = udf_crc((uint8_t *)sfi->impUse,
 110                               -fibh->soffset - sizeof(struct fileIdentDesc), crc);
 111                 crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
 112         }
 113
 114         cfi->descTag.descCRC = cpu_to_le16(crc);
 115         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 116
 117         for (i = 0; i < 16; i++) {
 118                 if (i != 4)
 119                         checksum += ((uint8_t *)&cfi->descTag)[i];
 120         }
 121
 122         cfi->descTag.tagChecksum = checksum;
 123         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 124                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc));
 125         } else {
 126                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 127                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 128                        sizeof(struct fileIdentDesc) + fibh->soffset);
 129         }
 130
 131         if (adinicb) {
 132                 mark_inode_dirty(inode);
 133         } else {
 134                 if (fibh->sbh != fibh->ebh)
 135                         mark_buffer_dirty_inode(fibh->ebh, inode);
 136                 mark_buffer_dirty_inode(fibh->sbh, inode);
 137         }
 138         return 0;
 139 }
 140
 141 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 142                                             struct dentry *dentry,
 143                                             struct udf_fileident_bh *fibh,
 144                                             struct fileIdentDesc *cfi)
 145 {
 146         struct fileIdentDesc *fi = NULL;
 147         loff_t f_pos;
 148         int block, flen;
 149         char fname[UDF_NAME_LEN];
 150         char *nameptr;
 151         uint8_t lfi;
 152         uint16_t liu;
 153         loff_t size;
 154         kernel_lb_addr eloc;
 155         uint32_t elen;
 156         sector_t offset;
 157         struct extent_position epos = {};
 158
 159         size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 160         f_pos = (udf_ext0_offset(dir) >> 2);
 161
 162         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 163         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
 164                 fibh->sbh = fibh->ebh = NULL;
 165         } else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 166                               &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
 167                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 168                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 169                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 170                                 epos.offset -= sizeof(short_ad);
 171                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 172                                 epos.offset -= sizeof(long_ad);
 173                 } else {
 174                         offset = 0;
 175                 }
 176
 177                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) {
 178                         brelse(epos.bh);
 179                         return NULL;
 180                 }
 181         } else {
 182                 brelse(epos.bh);
 183                 return NULL;
 184         }
 185
 186         while ((f_pos < size)) {
 187                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 188                                         &elen, &offset);
 189                 if (!fi) {
 190                         if (fibh->sbh != fibh->ebh)
 191                                 brelse(fibh->ebh);
 192                         brelse(fibh->sbh);
 193                         brelse(epos.bh);
 194                         return NULL;
 195                 }
 196
 197                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 198                 lfi = cfi->lengthFileIdent;
 199
 200                 if (fibh->sbh == fibh->ebh) {
 201                         nameptr = fi->fileIdent + liu;
 202                 } else {
 203                         int poffset;    /* Unpaded ending offset */
 204
 205                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 206
 207                         if (poffset >= lfi) {
 208                                 nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi);
 209                         } else {
 210                                 nameptr = fname;
 211                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 212                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 213                         }
 214                 }
 215
 216                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 217                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
 218                                 continue;
 219                 }
 220
 221                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 222                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
 223                                 continue;
 224                 }
 225
 226                 if (!lfi)
 227                         continue;
 228
 229                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi))) {
 230                         if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) {
 231                                 brelse(epos.bh);
 232                                 return fi;
 233                         }
 234                 }
 235         }
 236
 237         if (fibh->sbh != fibh->ebh)
 238                 brelse(fibh->ebh);
 239         brelse(fibh->sbh);
 240         brelse(epos.bh);
 241
 242         return NULL;
 243 }
 244
 245 /*
 246  * udf_lookup
 247  *
 248  * PURPOSE
 249  *      Look-up the inode for a given name.
 250  *
 251  * DESCRIPTION
 252  *      Required - lookup_dentry() will return -ENOTDIR if this routine is not
 253  *      available for a directory. The filesystem is useless if this routine is
 254  *      not available for at least the filesystem's root directory.
 255  *
 256  *      This routine is passed an incomplete dentry - it must be completed by
 257  *      calling d_add(dentry, inode). If the name does not exist, then the
 258  *      specified inode must be set to null. An error should only be returned
 259  *      when the lookup fails for a reason other than the name not existing.
 260  *      Note that the directory inode semaphore is held during the call.
 261  *
 262  *      Refer to lookup_dentry() in fs/namei.c
 263  *      lookup_dentry() -> lookup() -> real_lookup() -> .
 264  *
 265  * PRE-CONDITIONS
 266  *      dir                     Pointer to inode of parent directory.
 267  *      dentry                  Pointer to dentry to complete.
 268  *      nd                      Pointer to lookup nameidata
 269  *
 270  * POST-CONDITIONS
 271  *      <return>                Zero on success.
 272  *
 273  * HISTORY
 274  *      July 1, 1997 - Andrew E. Mileski
 275  *      Written, tested, and released.
 276  */
 277
 278 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 279                                  struct nameidata *nd)
 280 {
 281         struct inode *inode = NULL;
 282         struct fileIdentDesc cfi;
 283         struct udf_fileident_bh fibh;
 284
 285         if (dentry->d_name.len > UDF_NAME_LEN - 2)
 286                 return ERR_PTR(-ENAMETOOLONG);
 287
 288         lock_kernel();
 289 #ifdef UDF_RECOVERY
 290         /* temporary shorthand for specifying files by inode number */
 291         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 292                 kernel_lb_addr lb = {
 293                         .logicalBlockNum = 0,
 294                         .partitionReferenceNum = simple_strtoul(dentry->d_name.name + 3,
 295                                                                 NULL, 0),
 296                 };
 297                 inode = udf_iget(dir->i_sb, lb);
 298                 if (!inode) {
 299                         unlock_kernel();
 300                         return ERR_PTR(-EACCES);
 301                 }
 302         }
 303         else
 304 #endif /* UDF_RECOVERY */
 305
 306         if (udf_find_entry(dir, dentry, &fibh, &cfi)) {
 307                 if (fibh.sbh != fibh.ebh)
 308                         brelse(fibh.ebh);
 309                 brelse(fibh.sbh);
 310
 311                 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
 312                 if (!inode) {
 313                         unlock_kernel();
 314                         return ERR_PTR(-EACCES);
 315                 }
 316         }
 317         unlock_kernel();
 318         d_add(dentry, inode);
 319
 320         return NULL;
 321 }
 322
 323 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 324                                            struct dentry *dentry,
 325                                            struct udf_fileident_bh *fibh,
 326                                            struct fileIdentDesc *cfi, int *err)
 327 {
 328         struct super_block *sb;
 329         struct fileIdentDesc *fi = NULL;
 330         char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
 331         int namelen;
 332         loff_t f_pos;
 333         int flen;
 334         char *nameptr;
 335         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 336         int nfidlen;
 337         uint8_t lfi;
 338         uint16_t liu;
 339         int block;
 340         kernel_lb_addr eloc;
 341         uint32_t elen;
 342         sector_t offset;
 343         struct extent_position epos = {};
 344
 345         sb = dir->i_sb;
 346
 347         if (dentry) {
 348                 if (!dentry->d_name.len) {
 349                         *err = -EINVAL;
 350                         return NULL;
 351                 }
 352                 if (!(namelen = udf_put_filename(sb, dentry->d_name.name, name,
 353                                                  dentry->d_name.len))) {
 354                         *err = -ENAMETOOLONG;
 355                         return NULL;
 356                 }
 357         } else {
 358                 namelen = 0;
 359         }
 360
 361         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 362
 363         f_pos = (udf_ext0_offset(dir) >> 2);
 364
 365         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 366         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
 367                 fibh->sbh = fibh->ebh = NULL;
 368         } else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 369                               &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
 370                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 371                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 372                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 373                                 epos.offset -= sizeof(short_ad);
 374                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 375                                 epos.offset -= sizeof(long_ad);
 376                 } else {
 377                         offset = 0;
 378                 }
 379
 380                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) {
 381                         brelse(epos.bh);
 382                         *err = -EIO;
 383                         return NULL;
 384                 }
 385
 386                 block = UDF_I_LOCATION(dir).logicalBlockNum;
 387
 388         } else {
 389                 block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
 390                 fibh->sbh = fibh->ebh = NULL;
 391                 fibh->soffset = fibh->eoffset = sb->s_blocksize;
 392                 goto add;
 393         }
 394
 395         while ((f_pos < size)) {
 396                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 397                                         &elen, &offset);
 398
 399                 if (!fi) {
 400                         if (fibh->sbh != fibh->ebh)
 401                                 brelse(fibh->ebh);
 402                         brelse(fibh->sbh);
 403                         brelse(epos.bh);
 404                         *err = -EIO;
 405                         return NULL;
 406                 }
 407
 408                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 409                 lfi = cfi->lengthFileIdent;
 410
 411                 if (fibh->sbh == fibh->ebh) {
 412                         nameptr = fi->fileIdent + liu;
 413                 } else {
 414                         int poffset;    /* Unpaded ending offset */
 415
 416                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 417
 418                         if (poffset >= lfi) {
 419                                 nameptr = (char *)(fibh->ebh->b_data + poffset - lfi);
 420                         } else {
 421                                 nameptr = fname;
 422                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 423                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 424                         }
 425                 }
 426
 427                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 428                         if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen) {
 429                                 brelse(epos.bh);
 430                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 431                                 cfi->fileVersionNum = cpu_to_le16(1);
 432                                 cfi->fileCharacteristics = 0;
 433                                 cfi->lengthFileIdent = namelen;
 434                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 435                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 436                                         return fi;
 437                                 } else {
 438                                         *err = -EIO;
 439                                         return NULL;
 440                                 }
 441                         }
 442                 }
 443
 444                 if (!lfi || !dentry)
 445                         continue;
 446
 447                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) &&
 448                     udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name)) {
 449                         if (fibh->sbh != fibh->ebh)
 450                                 brelse(fibh->ebh);
 451                         brelse(fibh->sbh);
 452                         brelse(epos.bh);
 453                         *err = -EEXIST;
 454                         return NULL;
 455                 }
 456         }
 457
 458 add:
 459         f_pos += nfidlen;
 460
 461         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB &&
 462             sb->s_blocksize - fibh->eoffset < nfidlen) {
 463                 brelse(epos.bh);
 464                 epos.bh = NULL;
 465                 fibh->soffset -= udf_ext0_offset(dir);
 466                 fibh->eoffset -= udf_ext0_offset(dir);
 467                 f_pos -= (udf_ext0_offset(dir) >> 2);
 468                 if (fibh->sbh != fibh->ebh)
 469                         brelse(fibh->ebh);
 470                 brelse(fibh->sbh);
 471                 if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err)))
 472                         return NULL;
 473                 epos.block = UDF_I_LOCATION(dir);
 474                 eloc.logicalBlockNum = block;
 475                 eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 476                 elen = dir->i_sb->s_blocksize;
 477                 epos.offset = udf_file_entry_alloc_offset(dir);
 478                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 479                         epos.offset += sizeof(short_ad);
 480                 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 481                         epos.offset += sizeof(long_ad);
 482         }
 483
 484         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 485                 fibh->soffset = fibh->eoffset;
 486                 fibh->eoffset += nfidlen;
 487                 if (fibh->sbh != fibh->ebh) {
 488                         brelse(fibh->sbh);
 489                         fibh->sbh = fibh->ebh;
 490                 }
 491
 492                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
 493                         block = UDF_I_LOCATION(dir).logicalBlockNum;
 494                         fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset -
 495                                                       udf_ext0_offset(dir) +
 496                                                       UDF_I_LENEATTR(dir));
 497                 } else {
 498                         block = eloc.logicalBlockNum + ((elen - 1) >>
 499                                                         dir->i_sb->s_blocksize_bits);
 500                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset);
 501                 }
 502         } else {
 503                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 504                 fibh->eoffset += nfidlen - sb->s_blocksize;
 505                 if (fibh->sbh != fibh->ebh) {
 506                         brelse(fibh->sbh);
 507                         fibh->sbh = fibh->ebh;
 508                 }
 509
 510                 block = eloc.logicalBlockNum + ((elen - 1) >>
 511                                                 dir->i_sb->s_blocksize_bits);
 512                 fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err);
 513                 if (!fibh->ebh) {
 514                         brelse(epos.bh);
 515                         brelse(fibh->sbh);
 516                         return NULL;
 517                 }
 518
 519                 if (!fibh->soffset) {
 520                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 521                             (EXT_RECORDED_ALLOCATED >> 30)) {
 522                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 523                                         dir->i_sb->s_blocksize_bits);
 524                         } else {
 525                                 block++;
 526                         }
 527
 528                         brelse(fibh->sbh);
 529                         fibh->sbh = fibh->ebh;
 530                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 531                 } else {
 532                         fi = (struct fileIdentDesc *)
 533                                 (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset);
 534                 }
 535         }
 536
 537         memset(cfi, 0, sizeof(struct fileIdentDesc));
 538         if (UDF_SB_UDFREV(sb) >= 0x0200)
 539                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag));
 540         else
 541                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag));
 542         cfi->fileVersionNum = cpu_to_le16(1);
 543         cfi->lengthFileIdent = namelen;
 544         cfi->lengthOfImpUse = cpu_to_le16(0);
 545         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 546                 brelse(epos.bh);
 547                 dir->i_size += nfidlen;
 548                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 549                         UDF_I_LENALLOC(dir) += nfidlen;
 550                 mark_inode_dirty(dir);
 551                 return fi;
 552         } else {
 553                 brelse(epos.bh);
 554                 if (fibh->sbh != fibh->ebh)
 555                         brelse(fibh->ebh);
 556                 brelse(fibh->sbh);
 557                 *err = -EIO;
 558                 return NULL;
 559         }
 560 }
 561
 562 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 563                             struct udf_fileident_bh *fibh,
 564                             struct fileIdentDesc *cfi)
 565 {
 566         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 567
 568         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 569                 memset(&(cfi->icb), 0x00, sizeof(long_ad));
 570
 571         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 572 }
 573
 574 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
 575                       struct nameidata *nd)
 576 {
 577         struct udf_fileident_bh fibh;
 578         struct inode *inode;
 579         struct fileIdentDesc cfi, *fi;
 580         int err;
 581
 582         lock_kernel();
 583         inode = udf_new_inode(dir, mode, &err);
 584         if (!inode) {
 585                 unlock_kernel();
 586                 return err;
 587         }
 588
 589         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 590                 inode->i_data.a_ops = &udf_adinicb_aops;
 591         else
 592                 inode->i_data.a_ops = &udf_aops;
 593         inode->i_op = &udf_file_inode_operations;
 594         inode->i_fop = &udf_file_operations;
 595         inode->i_mode = mode;
 596         mark_inode_dirty(inode);
 597
 598         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
 599                 inode->i_nlink--;
 600                 mark_inode_dirty(inode);
 601                 iput(inode);
 602                 unlock_kernel();
 603                 return err;
 604         }
 605         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 606         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 607         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 608                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 609         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 610         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
 611                 mark_inode_dirty(dir);
 612         }
 613         if (fibh.sbh != fibh.ebh)
 614                 brelse(fibh.ebh);
 615         brelse(fibh.sbh);
 616         unlock_kernel();
 617         d_instantiate(dentry, inode);
 618
 619         return 0;
 620 }
 621
 622 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
 623                      dev_t rdev)
 624 {
 625         struct inode *inode;
 626         struct udf_fileident_bh fibh;
 627         struct fileIdentDesc cfi, *fi;
 628         int err;
 629
 630         if (!old_valid_dev(rdev))
 631                 return -EINVAL;
 632
 633         lock_kernel();
 634         err = -EIO;
 635         inode = udf_new_inode(dir, mode, &err);
 636         if (!inode)
 637                 goto out;
 638
 639         inode->i_uid = current->fsuid;
 640         init_special_inode(inode, mode, rdev);
 641         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
 642                 inode->i_nlink--;
 643                 mark_inode_dirty(inode);
 644                 iput(inode);
 645                 unlock_kernel();
 646                 return err;
 647         }
 648         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 649         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 650         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 651                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 652         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 653         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
 654                 mark_inode_dirty(dir);
 655         }
 656         mark_inode_dirty(inode);
 657
 658         if (fibh.sbh != fibh.ebh)
 659                 brelse(fibh.ebh);
 660         brelse(fibh.sbh);
 661         d_instantiate(dentry, inode);
 662         err = 0;
 663
 664 out:
 665         unlock_kernel();
 666         return err;
 667 }
 668
 669 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 670 {
 671         struct inode *inode;
 672         struct udf_fileident_bh fibh;
 673         struct fileIdentDesc cfi, *fi;
 674         int err;
 675
 676         lock_kernel();
 677         err = -EMLINK;
 678         if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
 679                 goto out;
 680
 681         err = -EIO;
 682         inode = udf_new_inode(dir, S_IFDIR, &err);
 683         if (!inode)
 684                 goto out;
 685
 686         inode->i_op = &udf_dir_inode_operations;
 687         inode->i_fop = &udf_dir_operations;
 688         if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err))) {
 689                 inode->i_nlink--;
 690                 mark_inode_dirty(inode);
 691                 iput(inode);
 692                 goto out;
 693         }
 694         inode->i_nlink = 2;
 695         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 696         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir));
 697         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 698                 cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
 699         cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 700         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 701         brelse(fibh.sbh);
 702         inode->i_mode = S_IFDIR | mode;
 703         if (dir->i_mode & S_ISGID)
 704                 inode->i_mode |= S_ISGID;
 705         mark_inode_dirty(inode);
 706
 707         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
 708                 inode->i_nlink = 0;
 709                 mark_inode_dirty(inode);
 710                 iput(inode);
 711                 goto out;
 712         }
 713         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 714         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 715         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 716                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 717         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 718         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 719         inc_nlink(dir);
 720         mark_inode_dirty(dir);
 721         d_instantiate(dentry, inode);
 722         if (fibh.sbh != fibh.ebh)
 723                 brelse(fibh.ebh);
 724         brelse(fibh.sbh);
 725         err = 0;
 726
 727 out:
 728         unlock_kernel();
 729         return err;
 730 }
 731
 732 static int empty_dir(struct inode *dir)
 733 {
 734         struct fileIdentDesc *fi, cfi;
 735         struct udf_fileident_bh fibh;
 736         loff_t f_pos;
 737         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 738         int block;
 739         kernel_lb_addr eloc;
 740         uint32_t elen;
 741         sector_t offset;
 742         struct extent_position epos = {};
 743
 744         f_pos = (udf_ext0_offset(dir) >> 2);
 745
 746         fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 747
 748         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
 749                 fibh.sbh = fibh.ebh = NULL;
 750         } else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 751                               &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
 752                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 753                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 754                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 755                                 epos.offset -= sizeof(short_ad);
 756                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 757                                 epos.offset -= sizeof(long_ad);
 758                 } else {
 759                         offset = 0;
 760                 }
 761
 762                 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
 763                         brelse(epos.bh);
 764                         return 0;
 765                 }
 766         } else {
 767                 brelse(epos.bh);
 768                 return 0;
 769         }
 770
 771         while ((f_pos < size)) {
 772                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 773                                         &elen, &offset);
 774                 if (!fi) {
 775                         if (fibh.sbh != fibh.ebh)
 776                                 brelse(fibh.ebh);
 777                         brelse(fibh.sbh);
 778                         brelse(epos.bh);
 779                         return 0;
 780                 }
 781
 782                 if (cfi.lengthFileIdent &&
 783                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 784                         if (fibh.sbh != fibh.ebh)
 785                                 brelse(fibh.ebh);
 786                         brelse(fibh.sbh);
 787                         brelse(epos.bh);
 788                         return 0;
 789                 }
 790         }
 791
 792         if (fibh.sbh != fibh.ebh)
 793                 brelse(fibh.ebh);
 794         brelse(fibh.sbh);
 795         brelse(epos.bh);
 796
 797         return 1;
 798 }
 799
 800 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 801 {
 802         int retval;
 803         struct inode *inode = dentry->d_inode;
 804         struct udf_fileident_bh fibh;
 805         struct fileIdentDesc *fi, cfi;
 806         kernel_lb_addr tloc;
 807
 808         retval = -ENOENT;
 809         lock_kernel();
 810         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 811         if (!fi)
 812                 goto out;
 813
 814         retval = -EIO;
 815         tloc = lelb_to_cpu(cfi.icb.extLocation);
 816         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 817                 goto end_rmdir;
 818         retval = -ENOTEMPTY;
 819         if (!empty_dir(inode))
 820                 goto end_rmdir;
 821         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 822         if (retval)
 823                 goto end_rmdir;
 824         if (inode->i_nlink != 2)
 825                 udf_warning(inode->i_sb, "udf_rmdir",
 826                             "empty directory has nlink != 2 (%d)",
 827                             inode->i_nlink);
 828         clear_nlink(inode);
 829         inode->i_size = 0;
 830         inode_dec_link_count(dir);
 831         inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 832         mark_inode_dirty(dir);
 833
 834 end_rmdir:
 835         if (fibh.sbh != fibh.ebh)
 836                 brelse(fibh.ebh);
 837         brelse(fibh.sbh);
 838
 839 out:
 840         unlock_kernel();
 841         return retval;
 842 }
 843
 844 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 845 {
 846         int retval;
 847         struct inode *inode = dentry->d_inode;
 848         struct udf_fileident_bh fibh;
 849         struct fileIdentDesc *fi;
 850         struct fileIdentDesc cfi;
 851         kernel_lb_addr tloc;
 852
 853         retval = -ENOENT;
 854         lock_kernel();
 855         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 856         if (!fi)
 857                 goto out;
 858
 859         retval = -EIO;
 860         tloc = lelb_to_cpu(cfi.icb.extLocation);
 861         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 862                 goto end_unlink;
 863
 864         if (!inode->i_nlink) {
 865                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 866                           inode->i_ino, inode->i_nlink);
 867                 inode->i_nlink = 1;
 868         }
 869         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 870         if (retval)
 871                 goto end_unlink;
 872         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 873         mark_inode_dirty(dir);
 874         inode_dec_link_count(inode);
 875         inode->i_ctime = dir->i_ctime;
 876         retval = 0;
 877
 878 end_unlink:
 879         if (fibh.sbh != fibh.ebh)
 880                 brelse(fibh.ebh);
 881         brelse(fibh.sbh);
 882
 883 out:
 884         unlock_kernel();
 885         return retval;
 886 }
 887
 888 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 889                        const char *symname)
 890 {
 891         struct inode *inode;
 892         struct pathComponent *pc;
 893         char *compstart;
 894         struct udf_fileident_bh fibh;
 895         struct extent_position epos = {};
 896         int eoffset, elen = 0;
 897         struct fileIdentDesc *fi;
 898         struct fileIdentDesc cfi;
 899         char *ea;
 900         int err;
 901         int block;
 902         char name[UDF_NAME_LEN];
 903         int namelen;
 904
 905         lock_kernel();
 906         if (!(inode = udf_new_inode(dir, S_IFLNK, &err)))
 907                 goto out;
 908
 909         inode->i_mode = S_IFLNK | S_IRWXUGO;
 910         inode->i_data.a_ops = &udf_symlink_aops;
 911         inode->i_op = &page_symlink_inode_operations;
 912
 913         if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB) {
 914                 kernel_lb_addr eloc;
 915                 uint32_t elen;
 916
 917                 block = udf_new_block(inode->i_sb, inode,
 918                                       UDF_I_LOCATION(inode).partitionReferenceNum,
 919                                       UDF_I_LOCATION(inode).logicalBlockNum, &err);
 920                 if (!block)
 921                         goto out_no_entry;
 922                 epos.block = UDF_I_LOCATION(inode);
 923                 epos.offset = udf_file_entry_alloc_offset(inode);
 924                 epos.bh = NULL;
 925                 eloc.logicalBlockNum = block;
 926                 eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 927                 elen = inode->i_sb->s_blocksize;
 928                 UDF_I_LENEXTENTS(inode) = elen;
 929                 udf_add_aext(inode, &epos, eloc, elen, 0);
 930                 brelse(epos.bh);
 931
 932                 block = udf_get_pblock(inode->i_sb, block,
 933                                        UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 934                 epos.bh = udf_tread(inode->i_sb, block);
 935                 lock_buffer(epos.bh);
 936                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
 937                 set_buffer_uptodate(epos.bh);
 938                 unlock_buffer(epos.bh);
 939                 mark_buffer_dirty_inode(epos.bh, inode);
 940                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 941         } else {
 942                 ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
 943         }
 944
 945         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
 946         pc = (struct pathComponent *)ea;
 947
 948         if (*symname == '/') {
 949                 do {
 950                         symname++;
 951                 } while (*symname == '/');
 952
 953                 pc->componentType = 1;
 954                 pc->lengthComponentIdent = 0;
 955                 pc->componentFileVersionNum = 0;
 956                 pc += sizeof(struct pathComponent);
 957                 elen += sizeof(struct pathComponent);
 958         }
 959
 960         err = -ENAMETOOLONG;
 961
 962         while (*symname) {
 963                 if (elen + sizeof(struct pathComponent) > eoffset)
 964                         goto out_no_entry;
 965
 966                 pc = (struct pathComponent *)(ea + elen);
 967
 968                 compstart = (char *)symname;
 969
 970                 do {
 971                         symname++;
 972                 } while (*symname && *symname != '/');
 973
 974                 pc->componentType = 5;
 975                 pc->lengthComponentIdent = 0;
 976                 pc->componentFileVersionNum = 0;
 977                 if (compstart[0] == '.') {
 978                         if ((symname - compstart) == 1)
 979                                 pc->componentType = 4;
 980                         else if ((symname - compstart) == 2 && compstart[1] == '.')
 981                                 pc->componentType = 3;
 982                 }
 983
 984                 if (pc->componentType == 5) {
 985                         namelen = udf_put_filename(inode->i_sb, compstart, name,
 986                                                    symname - compstart);
 987                         if (!namelen)
 988                                 goto out_no_entry;
 989
 990                         if (elen + sizeof(struct pathComponent) + namelen > eoffset)
 991                                 goto out_no_entry;
 992                         else
 993                                 pc->lengthComponentIdent = namelen;
 994
 995                         memcpy(pc->componentIdent, name, namelen);
 996                 }
 997
 998                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
 999
1000                 if (*symname) {
1001                         do {
1002                                 symname++;
1003                         } while (*symname == '/');
1004                 }
1005         }
1006
1007         brelse(epos.bh);
1008         inode->i_size = elen;
1009         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1010                 UDF_I_LENALLOC(inode) = inode->i_size;
1011         mark_inode_dirty(inode);
1012
1013         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1014                 goto out_no_entry;
1015         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1016         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1017         if (UDF_SB_LVIDBH(inode->i_sb)) {
1018                 struct logicalVolHeaderDesc *lvhd;
1019                 uint64_t uniqueID;
1020                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1021                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1022                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1023                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1024                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1025                         uniqueID += 16;
1026                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1027                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1028         }
1029         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1030         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
1031                 mark_inode_dirty(dir);
1032         }
1033         if (fibh.sbh != fibh.ebh)
1034                 brelse(fibh.ebh);
1035         brelse(fibh.sbh);
1036         d_instantiate(dentry, inode);
1037         err = 0;
1038
1039 out:
1040         unlock_kernel();
1041         return err;
1042
1043 out_no_entry:
1044         inode_dec_link_count(inode);
1045         iput(inode);
1046         goto out;
1047 }
1048
1049 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1050                     struct dentry *dentry)
1051 {
1052         struct inode *inode = old_dentry->d_inode;
1053         struct udf_fileident_bh fibh;
1054         struct fileIdentDesc cfi, *fi;
1055         int err;
1056
1057         lock_kernel();
1058         if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1059                 unlock_kernel();
1060                 return -EMLINK;
1061         }
1062
1063         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err))) {
1064                 unlock_kernel();
1065                 return err;
1066         }
1067         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1068         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1069         if (UDF_SB_LVIDBH(inode->i_sb)) {
1070                 struct logicalVolHeaderDesc *lvhd;
1071                 uint64_t uniqueID;
1072                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1073                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1074                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1075                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1076                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1077                         uniqueID += 16;
1078                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1079                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1080         }
1081         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1082         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) {
1083                 mark_inode_dirty(dir);
1084         }
1085
1086         if (fibh.sbh != fibh.ebh)
1087                 brelse(fibh.ebh);
1088         brelse(fibh.sbh);
1089         inc_nlink(inode);
1090         inode->i_ctime = current_fs_time(inode->i_sb);
1091         mark_inode_dirty(inode);
1092         atomic_inc(&inode->i_count);
1093         d_instantiate(dentry, inode);
1094         unlock_kernel();
1095
1096         return 0;
1097 }
1098
1099 /* Anybody can rename anything with this: the permission checks are left to the
1100  * higher-level routines.
1101  */
1102 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1103                       struct inode *new_dir, struct dentry *new_dentry)
1104 {
1105         struct inode *old_inode = old_dentry->d_inode;
1106         struct inode *new_inode = new_dentry->d_inode;
1107         struct udf_fileident_bh ofibh, nfibh;
1108         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi;
1109         struct buffer_head *dir_bh = NULL;
1110         int retval = -ENOENT;
1111         kernel_lb_addr tloc;
1112
1113         lock_kernel();
1114         if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi))) {
1115                 if (ofibh.sbh != ofibh.ebh)
1116                         brelse(ofibh.ebh);
1117                 brelse(ofibh.sbh);
1118         }
1119         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1120         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1121             != old_inode->i_ino)
1122                 goto end_rename;
1123
1124         nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1125         if (nfi) {
1126                 if (!new_inode) {
1127                         if (nfibh.sbh != nfibh.ebh)
1128                                 brelse(nfibh.ebh);
1129                         brelse(nfibh.sbh);
1130                         nfi = NULL;
1131                 }
1132         }
1133         if (S_ISDIR(old_inode->i_mode)) {
1134                 uint32_t offset = udf_ext0_offset(old_inode);
1135
1136                 if (new_inode) {
1137                         retval = -ENOTEMPTY;
1138                         if (!empty_dir(new_inode))
1139                                 goto end_rename;
1140                 }
1141                 retval = -EIO;
1142                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) {
1143                         dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) -
1144                                                    (UDF_I_EFE(old_inode) ?
1145                                                     sizeof(struct extendedFileEntry) :
1146                                                     sizeof(struct fileEntry)),
1147                                                    old_inode->i_sb->s_blocksize, &offset);
1148                 } else {
1149                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1150                         if (!dir_bh)
1151                                 goto end_rename;
1152                         dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset);
1153                 }
1154                 if (!dir_fi)
1155                         goto end_rename;
1156                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1157                 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) != old_dir->i_ino)
1158                         goto end_rename;
1159
1160                 retval = -EMLINK;
1161                 if (!new_inode && new_dir->i_nlink >= (256 << sizeof(new_dir->i_nlink)) - 1)
1162                         goto end_rename;
1163         }
1164         if (!nfi) {
1165                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval);
1166                 if (!nfi)
1167                         goto end_rename;
1168         }
1169
1170         /*
1171          * Like most other Unix systems, set the ctime for inodes on a
1172          * rename.
1173          */
1174         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1175         mark_inode_dirty(old_inode);
1176
1177         /*
1178          * ok, that's it
1179          */
1180         ncfi.fileVersionNum = ocfi.fileVersionNum;
1181         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1182         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1183         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1184
1185         /* The old fid may have moved - find it again */
1186         ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1187         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1188
1189         if (new_inode) {
1190                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1191                 inode_dec_link_count(new_inode);
1192         }
1193         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1194         mark_inode_dirty(old_dir);
1195
1196         if (dir_fi) {
1197                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir));
1198                 udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) +
1199                                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1200                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB) {
1201                         mark_inode_dirty(old_inode);
1202                 } else {
1203                         mark_buffer_dirty_inode(dir_bh, old_inode);
1204                 }
1205                 inode_dec_link_count(old_dir);
1206                 if (new_inode) {
1207                         inode_dec_link_count(new_inode);
1208                 } else {
1209                         inc_nlink(new_dir);
1210                         mark_inode_dirty(new_dir);
1211                 }
1212         }
1213
1214         if (ofi) {
1215                 if (ofibh.sbh != ofibh.ebh)
1216                         brelse(ofibh.ebh);
1217                 brelse(ofibh.sbh);
1218         }
1219
1220         retval = 0;
1221
1222 end_rename:
1223         brelse(dir_bh);
1224         if (nfi) {
1225                 if (nfibh.sbh != nfibh.ebh)
1226                         brelse(nfibh.ebh);
1227                 brelse(nfibh.sbh);
1228         }
1229         unlock_kernel();
1230
1231         return retval;
1232 }
1233
1234 const struct inode_operations udf_dir_inode_operations = {
1235         .lookup                         = udf_lookup,
1236         .create                         = udf_create,
1237         .link                           = udf_link,
1238         .unlink                         = udf_unlink,
1239         .symlink                        = udf_symlink,
1240         .mkdir                          = udf_mkdir,
1241         .rmdir                          = udf_rmdir,
1242         .mknod                          = udf_mknod,
1243         .rename                         = udf_rename,
1244 };