err.no Git - linux-2.6/blob - fs/udf/namei.c

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