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