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_le32(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 = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 163         lb_addr bloc, eloc;
 164         uint32_t extoffset, elen, offset;
 165         struct buffer_head *bh = NULL;
 166
 167         if (!dir)
 168                 return NULL;
 169
 170         f_pos = (udf_ext0_offset(dir) >> 2);
 171
 172         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 173         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 174                 fibh->sbh = fibh->ebh = NULL;
 175         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 176                 &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
 177         {
 178                 offset >>= dir->i_sb->s_blocksize_bits;
 179                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 180                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 181                 {
 182                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 183                                 extoffset -= sizeof(short_ad);
 184                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 185                                 extoffset -= sizeof(long_ad);
 186                 }
 187                 else
 188                         offset = 0;
 189
 190                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
 191                 {
 192                         udf_release_data(bh);
 193                         return NULL;
 194                 }
 195         }
 196         else
 197         {
 198                 udf_release_data(bh);
 199                 return NULL;
 200         }
 201
 202         while ( (f_pos < size) )
 203         {
 204                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
 205
 206                 if (!fi)
 207                 {
 208                         if (fibh->sbh != fibh->ebh)
 209                                 udf_release_data(fibh->ebh);
 210                         udf_release_data(fibh->sbh);
 211                         udf_release_data(bh);
 212                         return NULL;
 213                 }
 214
 215                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 216                 lfi = cfi->lengthFileIdent;
 217
 218                 if (fibh->sbh == fibh->ebh)
 219                 {
 220                         nameptr = fi->fileIdent + liu;
 221                 }
 222                 else
 223                 {
 224                         int poffset;    /* Unpaded ending offset */
 225
 226                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 227
 228                         if (poffset >= lfi)
 229                                 nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi);
 230                         else
 231                         {
 232                                 nameptr = fname;
 233                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 234                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 235                         }
 236                 }
 237
 238                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
 239                 {
 240                         if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
 241                                 continue;
 242                 }
 243
 244                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
 245                 {
 246                         if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
 247                                 continue;
 248                 }
 249
 250                 if (!lfi)
 251                         continue;
 252
 253                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)))
 254                 {
 255                         if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
 256                         {
 257                                 udf_release_data(bh);
 258                                 return fi;
 259                         }
 260                 }
 261         }
 262         if (fibh->sbh != fibh->ebh)
 263                 udf_release_data(fibh->ebh);
 264         udf_release_data(fibh->sbh);
 265         udf_release_data(bh);
 266         return NULL;
 267 }
 268
 269 /*
 270  * udf_lookup
 271  *
 272  * PURPOSE
 273  *      Look-up the inode for a given name.
 274  *
 275  * DESCRIPTION
 276  *      Required - lookup_dentry() will return -ENOTDIR if this routine is not
 277  *      available for a directory. The filesystem is useless if this routine is
 278  *      not available for at least the filesystem's root directory.
 279  *
 280  *      This routine is passed an incomplete dentry - it must be completed by
 281  *      calling d_add(dentry, inode). If the name does not exist, then the
 282  *      specified inode must be set to null. An error should only be returned
 283  *      when the lookup fails for a reason other than the name not existing.
 284  *      Note that the directory inode semaphore is held during the call.
 285  *
 286  *      Refer to lookup_dentry() in fs/namei.c
 287  *      lookup_dentry() -> lookup() -> real_lookup() -> .
 288  *
 289  * PRE-CONDITIONS
 290  *      dir                     Pointer to inode of parent directory.
 291  *      dentry                  Pointer to dentry to complete.
 292  *      nd                      Pointer to lookup nameidata
 293  *
 294  * POST-CONDITIONS
 295  *      <return>                Zero on success.
 296  *
 297  * HISTORY
 298  *      July 1, 1997 - Andrew E. Mileski
 299  *      Written, tested, and released.
 300  */
 301
 302 static struct dentry *
 303 udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
 304 {
 305         struct inode *inode = NULL;
 306         struct fileIdentDesc cfi, *fi;
 307         struct udf_fileident_bh fibh;
 308
 309         if (dentry->d_name.len > UDF_NAME_LEN-2)
 310                 return ERR_PTR(-ENAMETOOLONG);
 311
 312         lock_kernel();
 313 #ifdef UDF_RECOVERY
 314         /* temporary shorthand for specifying files by inode number */
 315         if (!strncmp(dentry->d_name.name, ".B=", 3) )
 316         {
 317                 lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) };
 318                 inode = udf_iget(dir->i_sb, lb);
 319                 if (!inode)
 320                 {
 321                         unlock_kernel();
 322                         return ERR_PTR(-EACCES);
 323                 }
 324         }
 325         else
 326 #endif /* UDF_RECOVERY */
 327
 328         if ((fi = udf_find_entry(dir, dentry, &fibh, &cfi)))
 329         {
 330                 if (fibh.sbh != fibh.ebh)
 331                         udf_release_data(fibh.ebh);
 332                 udf_release_data(fibh.sbh);
 333
 334                 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
 335                 if ( !inode )
 336                 {
 337                         unlock_kernel();
 338                         return ERR_PTR(-EACCES);
 339                 }
 340         }
 341         unlock_kernel();
 342         d_add(dentry, inode);
 343         return NULL;
 344 }
 345
 346 static struct fileIdentDesc *
 347 udf_add_entry(struct inode *dir, struct dentry *dentry,
 348         struct udf_fileident_bh *fibh,
 349         struct fileIdentDesc *cfi, int *err)
 350 {
 351         struct super_block *sb;
 352         struct fileIdentDesc *fi=NULL;
 353         char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
 354         int namelen;
 355         loff_t f_pos;
 356         int flen;
 357         char *nameptr;
 358         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 359         int nfidlen;
 360         uint8_t lfi;
 361         uint16_t liu;
 362         int block;
 363         lb_addr bloc, eloc;
 364         uint32_t extoffset, elen, offset;
 365         struct buffer_head *bh = NULL;
 366
 367         sb = dir->i_sb;
 368
 369         if (dentry)
 370         {
 371                 if (!dentry->d_name.len)
 372                 {
 373                         *err = -EINVAL;
 374                         return NULL;
 375                 }
 376
 377                 if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len)))
 378                 {
 379                         *err = -ENAMETOOLONG;
 380                         return NULL;
 381                 }
 382         }
 383         else
 384                 namelen = 0;
 385
 386         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 387
 388         f_pos = (udf_ext0_offset(dir) >> 2);
 389
 390         fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 391         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 392                 fibh->sbh = fibh->ebh = NULL;
 393         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 394                 &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
 395         {
 396                 offset >>= dir->i_sb->s_blocksize_bits;
 397                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 398                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 399                 {
 400                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 401                                 extoffset -= sizeof(short_ad);
 402                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 403                                 extoffset -= sizeof(long_ad);
 404                 }
 405                 else
 406                         offset = 0;
 407
 408                 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
 409                 {
 410                         udf_release_data(bh);
 411                         *err = -EIO;
 412                         return NULL;
 413                 }
 414
 415                 block = UDF_I_LOCATION(dir).logicalBlockNum;
 416
 417         }
 418         else
 419         {
 420                 block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
 421                 fibh->sbh = fibh->ebh = NULL;
 422                 fibh->soffset = fibh->eoffset = sb->s_blocksize;
 423                 goto add;
 424         }
 425
 426         while ( (f_pos < size) )
 427         {
 428                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
 429
 430                 if (!fi)
 431                 {
 432                         if (fibh->sbh != fibh->ebh)
 433                                 udf_release_data(fibh->ebh);
 434                         udf_release_data(fibh->sbh);
 435                         udf_release_data(bh);
 436                         *err = -EIO;
 437                         return NULL;
 438                 }
 439
 440                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 441                 lfi = cfi->lengthFileIdent;
 442
 443                 if (fibh->sbh == fibh->ebh)
 444                         nameptr = fi->fileIdent + liu;
 445                 else
 446                 {
 447                         int poffset;    /* Unpaded ending offset */
 448
 449                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
 450
 451                         if (poffset >= lfi)
 452                                 nameptr = (char *)(fibh->ebh->b_data + poffset - lfi);
 453                         else
 454                         {
 455                                 nameptr = fname;
 456                                 memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
 457                                 memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
 458                         }
 459                 }
 460
 461                 if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
 462                 {
 463                         if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen)
 464                         {
 465                                 udf_release_data(bh);
 466                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 467                                 cfi->fileVersionNum = cpu_to_le16(1);
 468                                 cfi->fileCharacteristics = 0;
 469                                 cfi->lengthFileIdent = namelen;
 470                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 471                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
 472                                         return fi;
 473                                 else
 474                                 {
 475                                         *err = -EIO;
 476                                         return NULL;
 477                                 }
 478                         }
 479                 }
 480
 481                 if (!lfi || !dentry)
 482                         continue;
 483
 484                 if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) &&
 485                         udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
 486                 {
 487                         if (fibh->sbh != fibh->ebh)
 488                                 udf_release_data(fibh->ebh);
 489                         udf_release_data(fibh->sbh);
 490                         udf_release_data(bh);
 491                         *err = -EEXIST;
 492                         return NULL;
 493                 }
 494         }
 495
 496 add:
 497         f_pos += nfidlen;
 498
 499         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB &&
 500                 sb->s_blocksize - fibh->eoffset < nfidlen)
 501         {
 502                 udf_release_data(bh);
 503                 bh = NULL;
 504                 fibh->soffset -= udf_ext0_offset(dir);
 505                 fibh->eoffset -= udf_ext0_offset(dir);
 506                 f_pos -= (udf_ext0_offset(dir) >> 2);
 507                 if (fibh->sbh != fibh->ebh)
 508                         udf_release_data(fibh->ebh);
 509                 udf_release_data(fibh->sbh);
 510                 if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err)))
 511                         return NULL;
 512                 bloc = UDF_I_LOCATION(dir);
 513                 eloc.logicalBlockNum = block;
 514                 eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
 515                 elen = dir->i_sb->s_blocksize;
 516                 extoffset = udf_file_entry_alloc_offset(dir);
 517                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 518                         extoffset += sizeof(short_ad);
 519                 else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 520                         extoffset += sizeof(long_ad);
 521         }
 522
 523         if (sb->s_blocksize - fibh->eoffset >= nfidlen)
 524         {
 525                 fibh->soffset = fibh->eoffset;
 526                 fibh->eoffset += nfidlen;
 527                 if (fibh->sbh != fibh->ebh)
 528                 {
 529                         udf_release_data(fibh->sbh);
 530                         fibh->sbh = fibh->ebh;
 531                 }
 532
 533                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 534                 {
 535                         block = UDF_I_LOCATION(dir).logicalBlockNum;
 536                         fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir));
 537                 }
 538                 else
 539                 {
 540                         block = eloc.logicalBlockNum + ((elen - 1) >>
 541                                 dir->i_sb->s_blocksize_bits);
 542                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset);
 543                 }
 544         }
 545         else
 546         {
 547                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 548                 fibh->eoffset += nfidlen - sb->s_blocksize;
 549                 if (fibh->sbh != fibh->ebh)
 550                 {
 551                         udf_release_data(fibh->sbh);
 552                         fibh->sbh = fibh->ebh;
 553                 }
 554
 555                 block = eloc.logicalBlockNum + ((elen - 1) >>
 556                         dir->i_sb->s_blocksize_bits);
 557
 558                 if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err)))
 559                 {
 560                         udf_release_data(bh);
 561                         udf_release_data(fibh->sbh);
 562                         return NULL;
 563                 }
 564
 565                 if (!(fibh->soffset))
 566                 {
 567                         if (udf_next_aext(dir, &bloc, &extoffset, &eloc, &elen, &bh, 1) ==
 568                                 (EXT_RECORDED_ALLOCATED >> 30))
 569                         {
 570                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 571                                         dir->i_sb->s_blocksize_bits);
 572                         }
 573                         else
 574                                 block ++;
 575
 576                         udf_release_data(fibh->sbh);
 577                         fibh->sbh = fibh->ebh;
 578                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 579                 }
 580                 else
 581                 {
 582                         fi = (struct fileIdentDesc *)
 583                                 (fibh->sbh->b_data + sb->s_blocksize + fibh->soffset);
 584                 }
 585         }
 586
 587         memset(cfi, 0, sizeof(struct fileIdentDesc));
 588         if (UDF_SB_UDFREV(sb) >= 0x0200)
 589                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag));
 590         else
 591                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag));
 592         cfi->fileVersionNum = cpu_to_le16(1);
 593         cfi->lengthFileIdent = namelen;
 594         cfi->lengthOfImpUse = cpu_to_le16(0);
 595         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
 596         {
 597                 udf_release_data(bh);
 598                 dir->i_size += nfidlen;
 599                 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 600                         UDF_I_LENALLOC(dir) += nfidlen;
 601                 mark_inode_dirty(dir);
 602                 return fi;
 603         }
 604         else
 605         {
 606                 udf_release_data(bh);
 607                 if (fibh->sbh != fibh->ebh)
 608                         udf_release_data(fibh->ebh);
 609                 udf_release_data(fibh->sbh);
 610                 *err = -EIO;
 611                 return NULL;
 612         }
 613 }
 614
 615 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 616         struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi)
 617 {
 618         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 619         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 620                 memset(&(cfi->icb), 0x00, sizeof(long_ad));
 621         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 622 }
 623
 624 static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
 625 {
 626         struct udf_fileident_bh fibh;
 627         struct inode *inode;
 628         struct fileIdentDesc cfi, *fi;
 629         int err;
 630
 631         lock_kernel();
 632         inode = udf_new_inode(dir, mode, &err);
 633         if (!inode)
 634         {
 635                 unlock_kernel();
 636                 return err;
 637         }
 638
 639         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
 640                 inode->i_data.a_ops = &udf_adinicb_aops;
 641         else
 642                 inode->i_data.a_ops = &udf_aops;
 643         inode->i_op = &udf_file_inode_operations;
 644         inode->i_fop = &udf_file_operations;
 645         inode->i_mode = mode;
 646         mark_inode_dirty(inode);
 647
 648         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 649         {
 650                 inode->i_nlink --;
 651                 mark_inode_dirty(inode);
 652                 iput(inode);
 653                 unlock_kernel();
 654                 return err;
 655         }
 656         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 657         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 658         *(uint32_t *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 659                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 660         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 661         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 662         {
 663                 mark_inode_dirty(dir);
 664         }
 665         if (fibh.sbh != fibh.ebh)
 666                 udf_release_data(fibh.ebh);
 667         udf_release_data(fibh.sbh);
 668         unlock_kernel();
 669         d_instantiate(dentry, inode);
 670         return 0;
 671 }
 672
 673 static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev)
 674 {
 675         struct inode * inode;
 676         struct udf_fileident_bh fibh;
 677         struct fileIdentDesc cfi, *fi;
 678         int err;
 679
 680         if (!old_valid_dev(rdev))
 681                 return -EINVAL;
 682
 683         lock_kernel();
 684         err = -EIO;
 685         inode = udf_new_inode(dir, mode, &err);
 686         if (!inode)
 687                 goto out;
 688
 689         inode->i_uid = current->fsuid;
 690         init_special_inode(inode, mode, rdev);
 691         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 692         {
 693                 inode->i_nlink --;
 694                 mark_inode_dirty(inode);
 695                 iput(inode);
 696                 unlock_kernel();
 697                 return err;
 698         }
 699         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 700         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 701         *(uint32_t *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 702                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 703         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 704         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 705         {
 706                 mark_inode_dirty(dir);
 707         }
 708         mark_inode_dirty(inode);
 709
 710         if (fibh.sbh != fibh.ebh)
 711                 udf_release_data(fibh.ebh);
 712         udf_release_data(fibh.sbh);
 713         d_instantiate(dentry, inode);
 714         err = 0;
 715 out:
 716         unlock_kernel();
 717         return err;
 718 }
 719
 720 static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode)
 721 {
 722         struct inode * inode;
 723         struct udf_fileident_bh fibh;
 724         struct fileIdentDesc cfi, *fi;
 725         int err;
 726
 727         lock_kernel();
 728         err = -EMLINK;
 729         if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1)
 730                 goto out;
 731
 732         err = -EIO;
 733         inode = udf_new_inode(dir, S_IFDIR, &err);
 734         if (!inode)
 735                 goto out;
 736
 737         inode->i_op = &udf_dir_inode_operations;
 738         inode->i_fop = &udf_dir_operations;
 739         if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err)))
 740         {
 741                 inode->i_nlink--;
 742                 mark_inode_dirty(inode);
 743                 iput(inode);
 744                 goto out;
 745         }
 746         inode->i_nlink = 2;
 747         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 748         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir));
 749         *(uint32_t *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 750                 cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
 751         cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 752         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 753         udf_release_data(fibh.sbh);
 754         inode->i_mode = S_IFDIR | mode;
 755         if (dir->i_mode & S_ISGID)
 756                 inode->i_mode |= S_ISGID;
 757         mark_inode_dirty(inode);
 758
 759         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
 760         {
 761                 inode->i_nlink = 0;
 762                 mark_inode_dirty(inode);
 763                 iput(inode);
 764                 goto out;
 765         }
 766         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 767         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
 768         *(uint32_t *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 769                 cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
 770         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 771         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 772         dir->i_nlink++;
 773         mark_inode_dirty(dir);
 774         d_instantiate(dentry, inode);
 775         if (fibh.sbh != fibh.ebh)
 776                 udf_release_data(fibh.ebh);
 777         udf_release_data(fibh.sbh);
 778         err = 0;
 779 out:
 780         unlock_kernel();
 781         return err;
 782 }
 783
 784 static int empty_dir(struct inode *dir)
 785 {
 786         struct fileIdentDesc *fi, cfi;
 787         struct udf_fileident_bh fibh;
 788         loff_t f_pos;
 789         loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
 790         int block;
 791         lb_addr bloc, eloc;
 792         uint32_t extoffset, elen, offset;
 793         struct buffer_head *bh = NULL;
 794
 795         f_pos = (udf_ext0_offset(dir) >> 2);
 796
 797         fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
 798
 799         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
 800                 fibh.sbh = fibh.ebh = NULL;
 801         else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
 802                 &bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
 803         {
 804                 offset >>= dir->i_sb->s_blocksize_bits;
 805                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 806                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
 807                 {
 808                         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
 809                                 extoffset -= sizeof(short_ad);
 810                         else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
 811                                 extoffset -= sizeof(long_ad);
 812                 }
 813                 else
 814                         offset = 0;
 815
 816                 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
 817                 {
 818                         udf_release_data(bh);
 819                         return 0;
 820                 }
 821         }
 822         else
 823         {
 824                 udf_release_data(bh);
 825                 return 0;
 826         }
 827
 828
 829         while ( (f_pos < size) )
 830         {
 831                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
 832
 833                 if (!fi)
 834                 {
 835                         if (fibh.sbh != fibh.ebh)
 836                                 udf_release_data(fibh.ebh);
 837                         udf_release_data(fibh.sbh);
 838                         udf_release_data(bh);
 839                         return 0;
 840                 }
 841
 842                 if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0)
 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 0;
 849                 }
 850         }
 851         if (fibh.sbh != fibh.ebh)
 852                 udf_release_data(fibh.ebh);
 853         udf_release_data(fibh.sbh);
 854         udf_release_data(bh);
 855         return 1;
 856 }
 857
 858 static int udf_rmdir(struct inode * dir, struct dentry * dentry)
 859 {
 860         int retval;
 861         struct inode * inode = dentry->d_inode;
 862         struct udf_fileident_bh fibh;
 863         struct fileIdentDesc *fi, cfi;
 864
 865         retval = -ENOENT;
 866         lock_kernel();
 867         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 868         if (!fi)
 869                 goto out;
 870
 871         retval = -EIO;
 872         if (udf_get_lb_pblock(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation), 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_TIME;
 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
 908         retval = -ENOENT;
 909         lock_kernel();
 910         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 911         if (!fi)
 912                 goto out;
 913
 914         retval = -EIO;
 915
 916         if (udf_get_lb_pblock(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation), 0) !=
 917                 inode->i_ino)
 918         {
 919                 goto end_unlink;
 920         }
 921
 922         if (!inode->i_nlink)
 923         {
 924                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 925                         inode->i_ino, inode->i_nlink);
 926                 inode->i_nlink = 1;
 927         }
 928         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 929         if (retval)
 930                 goto end_unlink;
 931         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 932         mark_inode_dirty(dir);
 933         inode->i_nlink--;
 934         mark_inode_dirty(inode);
 935         inode->i_ctime = dir->i_ctime;
 936         retval = 0;
 937
 938 end_unlink:
 939         if (fibh.sbh != fibh.ebh)
 940                 udf_release_data(fibh.ebh);
 941         udf_release_data(fibh.sbh);
 942 out:
 943         unlock_kernel();
 944         return retval;
 945 }
 946
 947 static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname)
 948 {
 949         struct inode * inode;
 950         struct pathComponent *pc;
 951         char *compstart;
 952         struct udf_fileident_bh fibh;
 953         struct buffer_head *bh = NULL;
 954         int eoffset, elen = 0;
 955         struct fileIdentDesc *fi;
 956         struct fileIdentDesc cfi;
 957         char *ea;
 958         int err;
 959         int block;
 960         char name[UDF_NAME_LEN];
 961         int namelen;
 962
 963         lock_kernel();
 964         if (!(inode = udf_new_inode(dir, S_IFLNK, &err)))
 965                 goto out;
 966
 967         inode->i_mode = S_IFLNK | S_IRWXUGO;
 968         inode->i_data.a_ops = &udf_symlink_aops;
 969         inode->i_op = &page_symlink_inode_operations;
 970
 971         if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB)
 972         {
 973                 struct buffer_head *bh = NULL;
 974                 lb_addr bloc, eloc;
 975                 uint32_t elen, extoffset;
 976
 977                 block = udf_new_block(inode->i_sb, inode,
 978                         UDF_I_LOCATION(inode).partitionReferenceNum,
 979                         UDF_I_LOCATION(inode).logicalBlockNum, &err);
 980                 if (!block)
 981                         goto out_no_entry;
 982                 bloc = UDF_I_LOCATION(inode);
 983                 eloc.logicalBlockNum = block;
 984                 eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
 985                 elen = inode->i_sb->s_blocksize;
 986                 UDF_I_LENEXTENTS(inode) = elen;
 987                 extoffset = udf_file_entry_alloc_offset(inode);
 988                 udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 0);
 989                 udf_release_data(bh);
 990
 991                 block = udf_get_pblock(inode->i_sb, block,
 992                         UDF_I_LOCATION(inode).partitionReferenceNum, 0);
 993                 bh = udf_tread(inode->i_sb, block);
 994                 lock_buffer(bh);
 995                 memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
 996                 set_buffer_uptodate(bh);
 997                 unlock_buffer(bh);
 998                 mark_buffer_dirty_inode(bh, inode);
 999                 ea = bh->b_data + udf_ext0_offset(inode);
1000         }
1001         else
1002                 ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
1003
1004         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
1005         pc = (struct pathComponent *)ea;
1006
1007         if (*symname == '/')
1008         {
1009                 do
1010                 {
1011                         symname++;
1012                 } while (*symname == '/');
1013
1014                 pc->componentType = 1;
1015                 pc->lengthComponentIdent = 0;
1016                 pc->componentFileVersionNum = 0;
1017                 pc += sizeof(struct pathComponent);
1018                 elen += sizeof(struct pathComponent);
1019         }
1020
1021         err = -ENAMETOOLONG;
1022
1023         while (*symname)
1024         {
1025                 if (elen + sizeof(struct pathComponent) > eoffset)
1026                         goto out_no_entry;
1027
1028                 pc = (struct pathComponent *)(ea + elen);
1029
1030                 compstart = (char *)symname;
1031
1032                 do
1033                 {
1034                         symname++;
1035                 } while (*symname && *symname != '/');
1036
1037                 pc->componentType = 5;
1038                 pc->lengthComponentIdent = 0;
1039                 pc->componentFileVersionNum = 0;
1040                 if (compstart[0] == '.')
1041                 {
1042                         if ((symname-compstart) == 1)
1043                                 pc->componentType = 4;
1044                         else if ((symname-compstart) == 2 && compstart[1] == '.')
1045                                 pc->componentType = 3;
1046                 }
1047
1048                 if (pc->componentType == 5)
1049                 {
1050                         if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart)))
1051                                 goto out_no_entry;
1052
1053                         if (elen + sizeof(struct pathComponent) + namelen > eoffset)
1054                                 goto out_no_entry;
1055                         else
1056                                 pc->lengthComponentIdent = namelen;
1057
1058                         memcpy(pc->componentIdent, name, namelen);
1059                 }
1060
1061                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1062
1063                 if (*symname)
1064                 {
1065                         do
1066                         {
1067                                 symname++;
1068                         } while (*symname == '/');
1069                 }
1070         }
1071
1072         udf_release_data(bh);
1073         inode->i_size = elen;
1074         if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
1075                 UDF_I_LENALLOC(inode) = inode->i_size;
1076         mark_inode_dirty(inode);
1077
1078         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1079                 goto out_no_entry;
1080         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1081         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1082         if (UDF_SB_LVIDBH(inode->i_sb))
1083         {
1084                 struct logicalVolHeaderDesc *lvhd;
1085                 uint64_t uniqueID;
1086                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1087                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1088                 *(uint32_t *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1089                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1090                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1091                         uniqueID += 16;
1092                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1093                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1094         }
1095         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1096         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1097         {
1098                 mark_inode_dirty(dir);
1099         }
1100         if (fibh.sbh != fibh.ebh)
1101                 udf_release_data(fibh.ebh);
1102         udf_release_data(fibh.sbh);
1103         d_instantiate(dentry, inode);
1104         err = 0;
1105
1106 out:
1107         unlock_kernel();
1108         return err;
1109
1110 out_no_entry:
1111         inode->i_nlink--;
1112         mark_inode_dirty(inode);
1113         iput(inode);
1114         goto out;
1115 }
1116
1117 static int udf_link(struct dentry * old_dentry, struct inode * dir,
1118          struct dentry *dentry)
1119 {
1120         struct inode *inode = old_dentry->d_inode;
1121         struct udf_fileident_bh fibh;
1122         struct fileIdentDesc cfi, *fi;
1123         int err;
1124
1125         lock_kernel();
1126         if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1)
1127         {
1128                 unlock_kernel();
1129                 return -EMLINK;
1130         }
1131
1132         if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
1133         {
1134                 unlock_kernel();
1135                 return err;
1136         }
1137         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1138         cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
1139         if (UDF_SB_LVIDBH(inode->i_sb))
1140         {
1141                 struct logicalVolHeaderDesc *lvhd;
1142                 uint64_t uniqueID;
1143                 lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
1144                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1145                 *(uint32_t *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1146                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1147                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1148                         uniqueID += 16;
1149                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1150                 mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
1151         }
1152         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1153         if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
1154         {
1155                 mark_inode_dirty(dir);
1156         }
1157         if (fibh.sbh != fibh.ebh)
1158                 udf_release_data(fibh.ebh);
1159         udf_release_data(fibh.sbh);
1160         inode->i_nlink ++;
1161         inode->i_ctime = CURRENT_TIME;
1162         mark_inode_dirty(inode);
1163         atomic_inc(&inode->i_count);
1164         d_instantiate(dentry, inode);
1165         unlock_kernel();
1166         return 0;
1167 }
1168
1169 /* Anybody can rename anything with this: the permission checks are left to the
1170  * higher-level routines.
1171  */
1172 static int udf_rename (struct inode * old_dir, struct dentry * old_dentry,
1173         struct inode * new_dir, struct dentry * new_dentry)
1174 {
1175         struct inode * old_inode = old_dentry->d_inode;
1176         struct inode * new_inode = new_dentry->d_inode;
1177         struct udf_fileident_bh ofibh, nfibh;
1178         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi;
1179         struct buffer_head *dir_bh = NULL;
1180         int retval = -ENOENT;
1181
1182         lock_kernel();
1183         if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi)))
1184         {
1185                 if (ofibh.sbh != ofibh.ebh)
1186                         udf_release_data(ofibh.ebh);
1187                 udf_release_data(ofibh.sbh);
1188         }
1189         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, lelb_to_cpu(ocfi.icb.extLocation), 0) !=
1190                 old_inode->i_ino)
1191         {
1192                 goto end_rename;
1193         }
1194
1195         nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1196         if (nfi)
1197         {
1198                 if (!new_inode)
1199                 {
1200                         if (nfibh.sbh != nfibh.ebh)
1201                                 udf_release_data(nfibh.ebh);
1202                         udf_release_data(nfibh.sbh);
1203                         nfi = NULL;
1204                 }
1205         }
1206         if (S_ISDIR(old_inode->i_mode))
1207         {
1208                 uint32_t offset = udf_ext0_offset(old_inode);
1209
1210                 if (new_inode)
1211                 {
1212                         retval = -ENOTEMPTY;
1213                         if (!empty_dir(new_inode))
1214                                 goto end_rename;
1215                 }
1216                 retval = -EIO;
1217                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1218                 {
1219                         dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) -
1220                                 (UDF_I_EFE(old_inode) ?
1221                                         sizeof(struct extendedFileEntry) :
1222                                         sizeof(struct fileEntry)),
1223                                 old_inode->i_sb->s_blocksize, &offset);
1224                 }
1225                 else
1226                 {
1227                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1228                         if (!dir_bh)
1229                                 goto end_rename;
1230                         dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset);
1231                 }
1232                 if (!dir_fi)
1233                         goto end_rename;
1234                 if (udf_get_lb_pblock(old_inode->i_sb, cpu_to_lelb(dir_fi->icb.extLocation), 0) !=
1235                         old_dir->i_ino)
1236                 {
1237                         goto end_rename;
1238                 }
1239                 retval = -EMLINK;
1240                 if (!new_inode && new_dir->i_nlink >= (256<<sizeof(new_dir->i_nlink))-1)
1241                         goto end_rename;
1242         }
1243         if (!nfi)
1244         {
1245                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval);
1246                 if (!nfi)
1247                         goto end_rename;
1248         }
1249
1250         /*
1251          * Like most other Unix systems, set the ctime for inodes on a
1252          * rename.
1253          */
1254         old_inode->i_ctime = CURRENT_TIME;
1255         mark_inode_dirty(old_inode);
1256
1257         /*
1258          * ok, that's it
1259          */
1260         ncfi.fileVersionNum = ocfi.fileVersionNum;
1261         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1262         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1263         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1264
1265         /* The old fid may have moved - find it again */
1266         ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1267         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1268
1269         if (new_inode)
1270         {
1271                 new_inode->i_nlink--;
1272                 new_inode->i_ctime = CURRENT_TIME;
1273                 mark_inode_dirty(new_inode);
1274         }
1275         old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1276         mark_inode_dirty(old_dir);
1277
1278         if (dir_fi)
1279         {
1280                 dir_fi->icb.extLocation = lelb_to_cpu(UDF_I_LOCATION(new_dir));
1281                 udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) +
1282                         cpu_to_le16(dir_fi->lengthOfImpUse) + 3) & ~3);
1283                 if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
1284                 {
1285                         mark_inode_dirty(old_inode);
1286                 }
1287                 else
1288                         mark_buffer_dirty_inode(dir_bh, old_inode);
1289                 old_dir->i_nlink --;
1290                 mark_inode_dirty(old_dir);
1291                 if (new_inode)
1292                 {
1293                         new_inode->i_nlink --;
1294                         mark_inode_dirty(new_inode);
1295                 }
1296                 else
1297                 {
1298                         new_dir->i_nlink ++;
1299                         mark_inode_dirty(new_dir);
1300                 }
1301         }
1302
1303         if (ofi)
1304         {
1305                 if (ofibh.sbh != ofibh.ebh)
1306                         udf_release_data(ofibh.ebh);
1307                 udf_release_data(ofibh.sbh);
1308         }
1309
1310         retval = 0;
1311
1312 end_rename:
1313         udf_release_data(dir_bh);
1314         if (nfi)
1315         {
1316                 if (nfibh.sbh != nfibh.ebh)
1317                         udf_release_data(nfibh.ebh);
1318                 udf_release_data(nfibh.sbh);
1319         }
1320         unlock_kernel();
1321         return retval;
1322 }
1323
1324 struct inode_operations udf_dir_inode_operations = {
1325         .lookup                         = udf_lookup,
1326         .create                         = udf_create,
1327         .link                           = udf_link,
1328         .unlink                         = udf_unlink,
1329         .symlink                        = udf_symlink,
1330         .mkdir                          = udf_mkdir,
1331         .rmdir                          = udf_rmdir,
1332         .mknod                          = udf_mknod,
1333         .rename                         = udf_rename,
1334 };