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