git.oblomov.eu Git - linux-2.6/blob - fs/udf/namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2004 Ben Fennema
  14  *  (C) 1999-2000 Stelias Computing Inc
  15  *
  16  * HISTORY
  17  *
  18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  19  *  04/19/99 blf  link, mknod, symlink support
  20  */
  21
  22 #include "udfdecl.h"
  23
  24 #include "udf_i.h"
  25 #include "udf_sb.h"
  26 #include <linux/string.h>
  27 #include <linux/errno.h>
  28 #include <linux/mm.h>
  29 #include <linux/slab.h>
  30 #include <linux/quotaops.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/buffer_head.h>
  33 #include <linux/sched.h>
  34 #include <linux/crc-itu-t.h>
  35 #include <linux/exportfs.h>
  36
  37 static inline int udf_match(int len1, const char *name1, int len2,
  38                             const char *name2)
  39 {
  40         if (len1 != len2)
  41                 return 0;
  42
  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         int offset;
  53         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  54         uint8_t lfi = cfi->lengthFileIdent;
  55         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  56                 sizeof(struct fileIdentDesc);
  57         int adinicb = 0;
  58
  59         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  60                 adinicb = 1;
  61
  62         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  63
  64         if (impuse) {
  65                 if (adinicb || (offset + liu < 0)) {
  66                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  67                 } else if (offset >= 0) {
  68                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  69                 } else {
  70                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  71                         memcpy(fibh->ebh->b_data, impuse - offset,
  72                                 liu + offset);
  73                 }
  74         }
  75
  76         offset += liu;
  77
  78         if (fileident) {
  79                 if (adinicb || (offset + lfi < 0)) {
  80                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  81                 } else if (offset >= 0) {
  82                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  83                 } else {
  84                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  85                                 -offset);
  86                         memcpy(fibh->ebh->b_data, fileident - offset,
  87                                 lfi + offset);
  88                 }
  89         }
  90
  91         offset += lfi;
  92
  93         if (adinicb || (offset + padlen < 0)) {
  94                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  95         } else if (offset >= 0) {
  96                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  97         } else {
  98                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  99                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
 100         }
 101
 102         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(tag),
 103                       sizeof(struct fileIdentDesc) - sizeof(tag));
 104
 105         if (fibh->sbh == fibh->ebh) {
 106                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 107                               crclen + sizeof(tag) -
 108                               sizeof(struct fileIdentDesc));
 109         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 110                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 111                                         sizeof(struct fileIdentDesc) +
 112                                         fibh->soffset,
 113                               crclen + sizeof(tag) -
 114                                         sizeof(struct fileIdentDesc));
 115         } else {
 116                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 117                               -fibh->soffset - sizeof(struct fileIdentDesc));
 118                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 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 qstr *child,
 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 = NULL;
 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         int isdotdot = child->len == 2 &&
 163                 child->name[0] == '.' && child->name[1] == '.';
 164
 165         size = udf_ext0_offset(dir) + dir->i_size;
 166         f_pos = udf_ext0_offset(dir);
 167
 168         fibh->sbh = fibh->ebh = NULL;
 169         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 170         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 171                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 172                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
 173                         goto out_err;
 174                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 175                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 176                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 177                                 epos.offset -= sizeof(short_ad);
 178                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 179                                 epos.offset -= sizeof(long_ad);
 180                 } else
 181                         offset = 0;
 182
 183                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 184                 if (!fibh->sbh)
 185                         goto out_err;
 186         }
 187
 188         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 189         if (!fname)
 190                 goto out_err;
 191
 192         while (f_pos < size) {
 193                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 194                                         &elen, &offset);
 195                 if (!fi)
 196                         goto out_err;
 197
 198                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 199                 lfi = cfi->lengthFileIdent;
 200
 201                 if (fibh->sbh == fibh->ebh) {
 202                         nameptr = fi->fileIdent + liu;
 203                 } else {
 204                         int poffset;    /* Unpaded ending offset */
 205
 206                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 207                                         liu + lfi;
 208
 209                         if (poffset >= lfi)
 210                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 211                                                       poffset - lfi);
 212                         else {
 213                                 nameptr = fname;
 214                                 memcpy(nameptr, fi->fileIdent + liu,
 215                                         lfi - poffset);
 216                                 memcpy(nameptr + lfi - poffset,
 217                                         fibh->ebh->b_data, poffset);
 218                         }
 219                 }
 220
 221                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 222                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
 223                                 continue;
 224                 }
 225
 226                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 227                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
 228                                 continue;
 229                 }
 230
 231                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 232                     isdotdot) {
 233                         brelse(epos.bh);
 234                         return fi;
 235                 }
 236
 237                 if (!lfi)
 238                         continue;
 239
 240                 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
 241                 if (flen && udf_match(flen, fname, child->len, child->name))
 242                         goto out_ok;
 243         }
 244
 245 out_err:
 246         fi = NULL;
 247         if (fibh->sbh != fibh->ebh)
 248                 brelse(fibh->ebh);
 249         brelse(fibh->sbh);
 250 out_ok:
 251         brelse(epos.bh);
 252         kfree(fname);
 253
 254         return fi;
 255 }
 256
 257 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 258                                  struct nameidata *nd)
 259 {
 260         struct inode *inode = NULL;
 261         struct fileIdentDesc cfi;
 262         struct udf_fileident_bh fibh;
 263
 264         if (dentry->d_name.len > UDF_NAME_LEN - 2)
 265                 return ERR_PTR(-ENAMETOOLONG);
 266
 267         lock_kernel();
 268 #ifdef UDF_RECOVERY
 269         /* temporary shorthand for specifying files by inode number */
 270         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 271                 kernel_lb_addr lb = {
 272                         .logicalBlockNum = 0,
 273                         .partitionReferenceNum =
 274                                 simple_strtoul(dentry->d_name.name + 3,
 275                                                 NULL, 0),
 276                 };
 277                 inode = udf_iget(dir->i_sb, lb);
 278                 if (!inode) {
 279                         unlock_kernel();
 280                         return ERR_PTR(-EACCES);
 281                 }
 282         } else
 283 #endif /* UDF_RECOVERY */
 284
 285         if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
 286                 if (fibh.sbh != fibh.ebh)
 287                         brelse(fibh.ebh);
 288                 brelse(fibh.sbh);
 289
 290                 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
 291                 if (!inode) {
 292                         unlock_kernel();
 293                         return ERR_PTR(-EACCES);
 294                 }
 295         }
 296         unlock_kernel();
 297
 298         return d_splice_alias(inode, dentry);
 299 }
 300
 301 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 302                                            struct dentry *dentry,
 303                                            struct udf_fileident_bh *fibh,
 304                                            struct fileIdentDesc *cfi, int *err)
 305 {
 306         struct super_block *sb = dir->i_sb;
 307         struct fileIdentDesc *fi = NULL;
 308         char *name = NULL;
 309         int namelen;
 310         loff_t f_pos;
 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 = 0;
 318         sector_t offset;
 319         struct extent_position epos = {};
 320         struct udf_inode_info *dinfo;
 321
 322         fibh->sbh = fibh->ebh = NULL;
 323         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 324         if (!name) {
 325                 *err = -ENOMEM;
 326                 goto out_err;
 327         }
 328
 329         if (dentry) {
 330                 if (!dentry->d_name.len) {
 331                         *err = -EINVAL;
 332                         goto out_err;
 333                 }
 334                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
 335                                                  dentry->d_name.len);
 336                 if (!namelen) {
 337                         *err = -ENAMETOOLONG;
 338                         goto out_err;
 339                 }
 340         } else {
 341                 namelen = 0;
 342         }
 343
 344         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 345
 346         f_pos = udf_ext0_offset(dir);
 347
 348         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 349         dinfo = UDF_I(dir);
 350         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 351                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 352                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 353                         block = udf_get_lb_pblock(dir->i_sb,
 354                                         dinfo->i_location, 0);
 355                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 356                         goto add;
 357                 }
 358                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 359                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 360                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 361                                 epos.offset -= sizeof(short_ad);
 362                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 363                                 epos.offset -= sizeof(long_ad);
 364                 } else
 365                         offset = 0;
 366
 367                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 368                 if (!fibh->sbh) {
 369                         *err = -EIO;
 370                         goto out_err;
 371                 }
 372
 373                 block = dinfo->i_location.logicalBlockNum;
 374         }
 375
 376         while (f_pos < size) {
 377                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 378                                         &elen, &offset);
 379
 380                 if (!fi) {
 381                         *err = -EIO;
 382                         goto out_err;
 383                 }
 384
 385                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 386                 lfi = cfi->lengthFileIdent;
 387
 388                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 389                         if (((sizeof(struct fileIdentDesc) +
 390                                         liu + lfi + 3) & ~3) == nfidlen) {
 391                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 392                                 cfi->fileVersionNum = cpu_to_le16(1);
 393                                 cfi->fileCharacteristics = 0;
 394                                 cfi->lengthFileIdent = namelen;
 395                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 396                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 397                                                   name))
 398                                         goto out_ok;
 399                                 else {
 400                                         *err = -EIO;
 401                                         goto out_err;
 402                                 }
 403                         }
 404                 }
 405         }
 406
 407 add:
 408         /* Is there any extent whose size we need to round up? */
 409         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) {
 410                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 411                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 412                         epos.offset -= sizeof(short_ad);
 413                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 414                         epos.offset -= sizeof(long_ad);
 415                 udf_write_aext(dir, &epos, eloc, elen, 1);
 416         }
 417         f_pos += nfidlen;
 418
 419         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 420             sb->s_blocksize - fibh->eoffset < nfidlen) {
 421                 brelse(epos.bh);
 422                 epos.bh = NULL;
 423                 fibh->soffset -= udf_ext0_offset(dir);
 424                 fibh->eoffset -= udf_ext0_offset(dir);
 425                 f_pos -= udf_ext0_offset(dir);
 426                 if (fibh->sbh != fibh->ebh)
 427                         brelse(fibh->ebh);
 428                 brelse(fibh->sbh);
 429                 fibh->sbh = fibh->ebh =
 430                                 udf_expand_dir_adinicb(dir, &block, err);
 431                 if (!fibh->sbh)
 432                         goto out_err;
 433                 epos.block = dinfo->i_location;
 434                 epos.offset = udf_file_entry_alloc_offset(dir);
 435                 /* Load extent udf_expand_dir_adinicb() has created */
 436                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 437         }
 438
 439         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 440                 fibh->soffset = fibh->eoffset;
 441                 fibh->eoffset += nfidlen;
 442                 if (fibh->sbh != fibh->ebh) {
 443                         brelse(fibh->sbh);
 444                         fibh->sbh = fibh->ebh;
 445                 }
 446
 447                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 448                         block = dinfo->i_location.logicalBlockNum;
 449                         fi = (struct fileIdentDesc *)
 450                                         (dinfo->i_ext.i_data +
 451                                          fibh->soffset -
 452                                          udf_ext0_offset(dir) +
 453                                          dinfo->i_lenEAttr);
 454                 } else {
 455                         block = eloc.logicalBlockNum +
 456                                         ((elen - 1) >>
 457                                                 dir->i_sb->s_blocksize_bits);
 458                         fi = (struct fileIdentDesc *)
 459                                 (fibh->sbh->b_data + fibh->soffset);
 460                 }
 461         } else {
 462                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 463                 fibh->eoffset += nfidlen - sb->s_blocksize;
 464                 if (fibh->sbh != fibh->ebh) {
 465                         brelse(fibh->sbh);
 466                         fibh->sbh = fibh->ebh;
 467                 }
 468
 469                 block = eloc.logicalBlockNum + ((elen - 1) >>
 470                                                 dir->i_sb->s_blocksize_bits);
 471                 fibh->ebh = udf_bread(dir,
 472                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 473                 if (!fibh->ebh)
 474                         goto out_err;
 475
 476                 if (!fibh->soffset) {
 477                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 478                             (EXT_RECORDED_ALLOCATED >> 30)) {
 479                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 480                                         dir->i_sb->s_blocksize_bits);
 481                         } else
 482                                 block++;
 483
 484                         brelse(fibh->sbh);
 485                         fibh->sbh = fibh->ebh;
 486                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 487                 } else {
 488                         fi = (struct fileIdentDesc *)
 489                                 (fibh->sbh->b_data + sb->s_blocksize +
 490                                         fibh->soffset);
 491                 }
 492         }
 493
 494         memset(cfi, 0, sizeof(struct fileIdentDesc));
 495         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 496                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 497                             sizeof(tag));
 498         else
 499                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 500                             sizeof(tag));
 501         cfi->fileVersionNum = cpu_to_le16(1);
 502         cfi->lengthFileIdent = namelen;
 503         cfi->lengthOfImpUse = cpu_to_le16(0);
 504         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 505                 dir->i_size += nfidlen;
 506                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 507                         dinfo->i_lenAlloc += nfidlen;
 508                 mark_inode_dirty(dir);
 509                 goto out_ok;
 510         } else {
 511                 *err = -EIO;
 512                 goto out_err;
 513         }
 514
 515 out_err:
 516         fi = NULL;
 517         if (fibh->sbh != fibh->ebh)
 518                 brelse(fibh->ebh);
 519         brelse(fibh->sbh);
 520 out_ok:
 521         brelse(epos.bh);
 522         kfree(name);
 523         return fi;
 524 }
 525
 526 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 527                             struct udf_fileident_bh *fibh,
 528                             struct fileIdentDesc *cfi)
 529 {
 530         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 531
 532         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 533                 memset(&(cfi->icb), 0x00, sizeof(long_ad));
 534
 535         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 536 }
 537
 538 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
 539                       struct nameidata *nd)
 540 {
 541         struct udf_fileident_bh fibh;
 542         struct inode *inode;
 543         struct fileIdentDesc cfi, *fi;
 544         int err;
 545         struct udf_inode_info *iinfo;
 546
 547         lock_kernel();
 548         inode = udf_new_inode(dir, mode, &err);
 549         if (!inode) {
 550                 unlock_kernel();
 551                 return err;
 552         }
 553
 554         iinfo = UDF_I(inode);
 555         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 556                 inode->i_data.a_ops = &udf_adinicb_aops;
 557         else
 558                 inode->i_data.a_ops = &udf_aops;
 559         inode->i_op = &udf_file_inode_operations;
 560         inode->i_fop = &udf_file_operations;
 561         inode->i_mode = mode;
 562         mark_inode_dirty(inode);
 563
 564         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 565         if (!fi) {
 566                 inode->i_nlink--;
 567                 mark_inode_dirty(inode);
 568                 iput(inode);
 569                 unlock_kernel();
 570                 return err;
 571         }
 572         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 573         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 574         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 575                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 576         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 577         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 578                 mark_inode_dirty(dir);
 579         if (fibh.sbh != fibh.ebh)
 580                 brelse(fibh.ebh);
 581         brelse(fibh.sbh);
 582         unlock_kernel();
 583         d_instantiate(dentry, inode);
 584
 585         return 0;
 586 }
 587
 588 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
 589                      dev_t rdev)
 590 {
 591         struct inode *inode;
 592         struct udf_fileident_bh fibh;
 593         struct fileIdentDesc cfi, *fi;
 594         int err;
 595         struct udf_inode_info *iinfo;
 596
 597         if (!old_valid_dev(rdev))
 598                 return -EINVAL;
 599
 600         lock_kernel();
 601         err = -EIO;
 602         inode = udf_new_inode(dir, mode, &err);
 603         if (!inode)
 604                 goto out;
 605
 606         iinfo = UDF_I(inode);
 607         inode->i_uid = current_fsuid();
 608         init_special_inode(inode, mode, rdev);
 609         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 610         if (!fi) {
 611                 inode->i_nlink--;
 612                 mark_inode_dirty(inode);
 613                 iput(inode);
 614                 unlock_kernel();
 615                 return err;
 616         }
 617         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 618         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 619         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 620                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 621         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 622         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 623                 mark_inode_dirty(dir);
 624         mark_inode_dirty(inode);
 625
 626         if (fibh.sbh != fibh.ebh)
 627                 brelse(fibh.ebh);
 628         brelse(fibh.sbh);
 629         d_instantiate(dentry, inode);
 630         err = 0;
 631
 632 out:
 633         unlock_kernel();
 634         return err;
 635 }
 636
 637 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 638 {
 639         struct inode *inode;
 640         struct udf_fileident_bh fibh;
 641         struct fileIdentDesc cfi, *fi;
 642         int err;
 643         struct udf_inode_info *dinfo = UDF_I(dir);
 644         struct udf_inode_info *iinfo;
 645
 646         lock_kernel();
 647         err = -EMLINK;
 648         if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
 649                 goto out;
 650
 651         err = -EIO;
 652         inode = udf_new_inode(dir, S_IFDIR, &err);
 653         if (!inode)
 654                 goto out;
 655
 656         iinfo = UDF_I(inode);
 657         inode->i_op = &udf_dir_inode_operations;
 658         inode->i_fop = &udf_dir_operations;
 659         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 660         if (!fi) {
 661                 inode->i_nlink--;
 662                 mark_inode_dirty(inode);
 663                 iput(inode);
 664                 goto out;
 665         }
 666         inode->i_nlink = 2;
 667         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 668         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 669         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 670                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 671         cfi.fileCharacteristics =
 672                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 673         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 674         brelse(fibh.sbh);
 675         inode->i_mode = S_IFDIR | mode;
 676         if (dir->i_mode & S_ISGID)
 677                 inode->i_mode |= S_ISGID;
 678         mark_inode_dirty(inode);
 679
 680         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 681         if (!fi) {
 682                 inode->i_nlink = 0;
 683                 mark_inode_dirty(inode);
 684                 iput(inode);
 685                 goto out;
 686         }
 687         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 688         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 689         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 690                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 691         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 692         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 693         inc_nlink(dir);
 694         mark_inode_dirty(dir);
 695         d_instantiate(dentry, inode);
 696         if (fibh.sbh != fibh.ebh)
 697                 brelse(fibh.ebh);
 698         brelse(fibh.sbh);
 699         err = 0;
 700
 701 out:
 702         unlock_kernel();
 703         return err;
 704 }
 705
 706 static int empty_dir(struct inode *dir)
 707 {
 708         struct fileIdentDesc *fi, cfi;
 709         struct udf_fileident_bh fibh;
 710         loff_t f_pos;
 711         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 712         int block;
 713         kernel_lb_addr eloc;
 714         uint32_t elen;
 715         sector_t offset;
 716         struct extent_position epos = {};
 717         struct udf_inode_info *dinfo = UDF_I(dir);
 718
 719         f_pos = udf_ext0_offset(dir);
 720         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 721
 722         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 723                 fibh.sbh = fibh.ebh = NULL;
 724         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 725                               &epos, &eloc, &elen, &offset) ==
 726                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 727                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 728                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 729                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 730                                 epos.offset -= sizeof(short_ad);
 731                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 732                                 epos.offset -= sizeof(long_ad);
 733                 } else
 734                         offset = 0;
 735
 736                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 737                 if (!fibh.sbh) {
 738                         brelse(epos.bh);
 739                         return 0;
 740                 }
 741         } else {
 742                 brelse(epos.bh);
 743                 return 0;
 744         }
 745
 746         while (f_pos < size) {
 747                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 748                                         &elen, &offset);
 749                 if (!fi) {
 750                         if (fibh.sbh != fibh.ebh)
 751                                 brelse(fibh.ebh);
 752                         brelse(fibh.sbh);
 753                         brelse(epos.bh);
 754                         return 0;
 755                 }
 756
 757                 if (cfi.lengthFileIdent &&
 758                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 759                         if (fibh.sbh != fibh.ebh)
 760                                 brelse(fibh.ebh);
 761                         brelse(fibh.sbh);
 762                         brelse(epos.bh);
 763                         return 0;
 764                 }
 765         }
 766
 767         if (fibh.sbh != fibh.ebh)
 768                 brelse(fibh.ebh);
 769         brelse(fibh.sbh);
 770         brelse(epos.bh);
 771
 772         return 1;
 773 }
 774
 775 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 776 {
 777         int retval;
 778         struct inode *inode = dentry->d_inode;
 779         struct udf_fileident_bh fibh;
 780         struct fileIdentDesc *fi, cfi;
 781         kernel_lb_addr tloc;
 782
 783         retval = -ENOENT;
 784         lock_kernel();
 785         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 786         if (!fi)
 787                 goto out;
 788
 789         retval = -EIO;
 790         tloc = lelb_to_cpu(cfi.icb.extLocation);
 791         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 792                 goto end_rmdir;
 793         retval = -ENOTEMPTY;
 794         if (!empty_dir(inode))
 795                 goto end_rmdir;
 796         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 797         if (retval)
 798                 goto end_rmdir;
 799         if (inode->i_nlink != 2)
 800                 udf_warning(inode->i_sb, "udf_rmdir",
 801                             "empty directory has nlink != 2 (%d)",
 802                             inode->i_nlink);
 803         clear_nlink(inode);
 804         inode->i_size = 0;
 805         inode_dec_link_count(dir);
 806         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 807                                                 current_fs_time(dir->i_sb);
 808         mark_inode_dirty(dir);
 809
 810 end_rmdir:
 811         if (fibh.sbh != fibh.ebh)
 812                 brelse(fibh.ebh);
 813         brelse(fibh.sbh);
 814
 815 out:
 816         unlock_kernel();
 817         return retval;
 818 }
 819
 820 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 821 {
 822         int retval;
 823         struct inode *inode = dentry->d_inode;
 824         struct udf_fileident_bh fibh;
 825         struct fileIdentDesc *fi;
 826         struct fileIdentDesc cfi;
 827         kernel_lb_addr tloc;
 828
 829         retval = -ENOENT;
 830         lock_kernel();
 831         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 832         if (!fi)
 833                 goto out;
 834
 835         retval = -EIO;
 836         tloc = lelb_to_cpu(cfi.icb.extLocation);
 837         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 838                 goto end_unlink;
 839
 840         if (!inode->i_nlink) {
 841                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 842                           inode->i_ino, inode->i_nlink);
 843                 inode->i_nlink = 1;
 844         }
 845         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 846         if (retval)
 847                 goto end_unlink;
 848         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 849         mark_inode_dirty(dir);
 850         inode_dec_link_count(inode);
 851         inode->i_ctime = dir->i_ctime;
 852         retval = 0;
 853
 854 end_unlink:
 855         if (fibh.sbh != fibh.ebh)
 856                 brelse(fibh.ebh);
 857         brelse(fibh.sbh);
 858
 859 out:
 860         unlock_kernel();
 861         return retval;
 862 }
 863
 864 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 865                        const char *symname)
 866 {
 867         struct inode *inode;
 868         struct pathComponent *pc;
 869         char *compstart;
 870         struct udf_fileident_bh fibh;
 871         struct extent_position epos = {};
 872         int eoffset, elen = 0;
 873         struct fileIdentDesc *fi;
 874         struct fileIdentDesc cfi;
 875         char *ea;
 876         int err;
 877         int block;
 878         char *name = NULL;
 879         int namelen;
 880         struct buffer_head *bh;
 881         struct udf_inode_info *iinfo;
 882
 883         lock_kernel();
 884         inode = udf_new_inode(dir, S_IFLNK, &err);
 885         if (!inode)
 886                 goto out;
 887
 888         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 889         if (!name) {
 890                 err = -ENOMEM;
 891                 goto out_no_entry;
 892         }
 893
 894         iinfo = UDF_I(inode);
 895         inode->i_mode = S_IFLNK | S_IRWXUGO;
 896         inode->i_data.a_ops = &udf_symlink_aops;
 897         inode->i_op = &page_symlink_inode_operations;
 898
 899         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 900                 kernel_lb_addr eloc;
 901                 uint32_t bsize;
 902
 903                 block = udf_new_block(inode->i_sb, inode,
 904                                 iinfo->i_location.partitionReferenceNum,
 905                                 iinfo->i_location.logicalBlockNum, &err);
 906                 if (!block)
 907                         goto out_no_entry;
 908                 epos.block = iinfo->i_location;
 909                 epos.offset = udf_file_entry_alloc_offset(inode);
 910                 epos.bh = NULL;
 911                 eloc.logicalBlockNum = block;
 912                 eloc.partitionReferenceNum =
 913                                 iinfo->i_location.partitionReferenceNum;
 914                 bsize = inode->i_sb->s_blocksize;
 915                 iinfo->i_lenExtents = bsize;
 916                 udf_add_aext(inode, &epos, eloc, bsize, 0);
 917                 brelse(epos.bh);
 918
 919                 block = udf_get_pblock(inode->i_sb, block,
 920                                 iinfo->i_location.partitionReferenceNum,
 921                                 0);
 922                 epos.bh = udf_tread(inode->i_sb, block);
 923                 lock_buffer(epos.bh);
 924                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
 925                 set_buffer_uptodate(epos.bh);
 926                 unlock_buffer(epos.bh);
 927                 mark_buffer_dirty_inode(epos.bh, inode);
 928                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 929         } else
 930                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 931
 932         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
 933         pc = (struct pathComponent *)ea;
 934
 935         if (*symname == '/') {
 936                 do {
 937                         symname++;
 938                 } while (*symname == '/');
 939
 940                 pc->componentType = 1;
 941                 pc->lengthComponentIdent = 0;
 942                 pc->componentFileVersionNum = 0;
 943                 pc += sizeof(struct pathComponent);
 944                 elen += sizeof(struct pathComponent);
 945         }
 946
 947         err = -ENAMETOOLONG;
 948
 949         while (*symname) {
 950                 if (elen + sizeof(struct pathComponent) > eoffset)
 951                         goto out_no_entry;
 952
 953                 pc = (struct pathComponent *)(ea + elen);
 954
 955                 compstart = (char *)symname;
 956
 957                 do {
 958                         symname++;
 959                 } while (*symname && *symname != '/');
 960
 961                 pc->componentType = 5;
 962                 pc->lengthComponentIdent = 0;
 963                 pc->componentFileVersionNum = 0;
 964                 if (compstart[0] == '.') {
 965                         if ((symname - compstart) == 1)
 966                                 pc->componentType = 4;
 967                         else if ((symname - compstart) == 2 &&
 968                                         compstart[1] == '.')
 969                                 pc->componentType = 3;
 970                 }
 971
 972                 if (pc->componentType == 5) {
 973                         namelen = udf_put_filename(inode->i_sb, compstart, name,
 974                                                    symname - compstart);
 975                         if (!namelen)
 976                                 goto out_no_entry;
 977
 978                         if (elen + sizeof(struct pathComponent) + namelen >
 979                                         eoffset)
 980                                 goto out_no_entry;
 981                         else
 982                                 pc->lengthComponentIdent = namelen;
 983
 984                         memcpy(pc->componentIdent, name, namelen);
 985                 }
 986
 987                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
 988
 989                 if (*symname) {
 990                         do {
 991                                 symname++;
 992                         } while (*symname == '/');
 993                 }
 994         }
 995
 996         brelse(epos.bh);
 997         inode->i_size = elen;
 998         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 999                 iinfo->i_lenAlloc = inode->i_size;
1000         mark_inode_dirty(inode);
1001
1002         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1003         if (!fi)
1004                 goto out_no_entry;
1005         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1006         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1007         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1008         if (bh) {
1009                 struct logicalVolIntegrityDesc *lvid =
1010                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1011                 struct logicalVolHeaderDesc *lvhd;
1012                 uint64_t uniqueID;
1013                 lvhd = (struct logicalVolHeaderDesc *)
1014                                 lvid->logicalVolContentsUse;
1015                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1016                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1017                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1018                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1019                         uniqueID += 16;
1020                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1021                 mark_buffer_dirty(bh);
1022         }
1023         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1024         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1025                 mark_inode_dirty(dir);
1026         if (fibh.sbh != fibh.ebh)
1027                 brelse(fibh.ebh);
1028         brelse(fibh.sbh);
1029         d_instantiate(dentry, inode);
1030         err = 0;
1031
1032 out:
1033         kfree(name);
1034         unlock_kernel();
1035         return err;
1036
1037 out_no_entry:
1038         inode_dec_link_count(inode);
1039         iput(inode);
1040         goto out;
1041 }
1042
1043 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1044                     struct dentry *dentry)
1045 {
1046         struct inode *inode = old_dentry->d_inode;
1047         struct udf_fileident_bh fibh;
1048         struct fileIdentDesc cfi, *fi;
1049         int err;
1050         struct buffer_head *bh;
1051
1052         lock_kernel();
1053         if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1054                 unlock_kernel();
1055                 return -EMLINK;
1056         }
1057
1058         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1059         if (!fi) {
1060                 unlock_kernel();
1061                 return err;
1062         }
1063         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1064         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1065         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1066         if (bh) {
1067                 struct logicalVolIntegrityDesc *lvid =
1068                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1069                 struct logicalVolHeaderDesc *lvhd;
1070                 uint64_t uniqueID;
1071                 lvhd = (struct logicalVolHeaderDesc *)
1072                                 (lvid->logicalVolContentsUse);
1073                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1074                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1075                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1076                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1077                         uniqueID += 16;
1078                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1079                 mark_buffer_dirty(bh);
1080         }
1081         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1082         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1083                 mark_inode_dirty(dir);
1084
1085         if (fibh.sbh != fibh.ebh)
1086                 brelse(fibh.ebh);
1087         brelse(fibh.sbh);
1088         inc_nlink(inode);
1089         inode->i_ctime = current_fs_time(inode->i_sb);
1090         mark_inode_dirty(inode);
1091         atomic_inc(&inode->i_count);
1092         d_instantiate(dentry, inode);
1093         unlock_kernel();
1094
1095         return 0;
1096 }
1097
1098 /* Anybody can rename anything with this: the permission checks are left to the
1099  * higher-level routines.
1100  */
1101 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1102                       struct inode *new_dir, struct dentry *new_dentry)
1103 {
1104         struct inode *old_inode = old_dentry->d_inode;
1105         struct inode *new_inode = new_dentry->d_inode;
1106         struct udf_fileident_bh ofibh, nfibh;
1107         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1108         struct fileIdentDesc ocfi, ncfi;
1109         struct buffer_head *dir_bh = NULL;
1110         int retval = -ENOENT;
1111         kernel_lb_addr tloc;
1112         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1113
1114         lock_kernel();
1115         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1116         if (ofi) {
1117                 if (ofibh.sbh != ofibh.ebh)
1118                         brelse(ofibh.ebh);
1119                 brelse(ofibh.sbh);
1120         }
1121         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1122         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1123             != old_inode->i_ino)
1124                 goto end_rename;
1125
1126         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1127         if (nfi) {
1128                 if (!new_inode) {
1129                         if (nfibh.sbh != nfibh.ebh)
1130                                 brelse(nfibh.ebh);
1131                         brelse(nfibh.sbh);
1132                         nfi = NULL;
1133                 }
1134         }
1135         if (S_ISDIR(old_inode->i_mode)) {
1136                 int offset = udf_ext0_offset(old_inode);
1137
1138                 if (new_inode) {
1139                         retval = -ENOTEMPTY;
1140                         if (!empty_dir(new_inode))
1141                                 goto end_rename;
1142                 }
1143                 retval = -EIO;
1144                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1145                         dir_fi = udf_get_fileident(
1146                                         old_iinfo->i_ext.i_data -
1147                                           (old_iinfo->i_efe ?
1148                                            sizeof(struct extendedFileEntry) :
1149                                            sizeof(struct fileEntry)),
1150                                         old_inode->i_sb->s_blocksize, &offset);
1151                 } else {
1152                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1153                         if (!dir_bh)
1154                                 goto end_rename;
1155                         dir_fi = udf_get_fileident(dir_bh->b_data,
1156                                         old_inode->i_sb->s_blocksize, &offset);
1157                 }
1158                 if (!dir_fi)
1159                         goto end_rename;
1160                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1161                 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) !=
1162                                 old_dir->i_ino)
1163                         goto end_rename;
1164
1165                 retval = -EMLINK;
1166                 if (!new_inode &&
1167                         new_dir->i_nlink >=
1168                                 (256 << sizeof(new_dir->i_nlink)) - 1)
1169                         goto end_rename;
1170         }
1171         if (!nfi) {
1172                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1173                                     &retval);
1174                 if (!nfi)
1175                         goto end_rename;
1176         }
1177
1178         /*
1179          * Like most other Unix systems, set the ctime for inodes on a
1180          * rename.
1181          */
1182         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1183         mark_inode_dirty(old_inode);
1184
1185         /*
1186          * ok, that's it
1187          */
1188         ncfi.fileVersionNum = ocfi.fileVersionNum;
1189         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1190         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1191         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1192
1193         /* The old fid may have moved - find it again */
1194         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1195         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1196
1197         if (new_inode) {
1198                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1199                 inode_dec_link_count(new_inode);
1200         }
1201         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1202         mark_inode_dirty(old_dir);
1203
1204         if (dir_fi) {
1205                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1206                 udf_update_tag((char *)dir_fi,
1207                                 (sizeof(struct fileIdentDesc) +
1208                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1209                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1210                         mark_inode_dirty(old_inode);
1211                 else
1212                         mark_buffer_dirty_inode(dir_bh, old_inode);
1213
1214                 inode_dec_link_count(old_dir);
1215                 if (new_inode)
1216                         inode_dec_link_count(new_inode);
1217                 else {
1218                         inc_nlink(new_dir);
1219                         mark_inode_dirty(new_dir);
1220                 }
1221         }
1222
1223         if (ofi) {
1224                 if (ofibh.sbh != ofibh.ebh)
1225                         brelse(ofibh.ebh);
1226                 brelse(ofibh.sbh);
1227         }
1228
1229         retval = 0;
1230
1231 end_rename:
1232         brelse(dir_bh);
1233         if (nfi) {
1234                 if (nfibh.sbh != nfibh.ebh)
1235                         brelse(nfibh.ebh);
1236                 brelse(nfibh.sbh);
1237         }
1238         unlock_kernel();
1239
1240         return retval;
1241 }
1242
1243 static struct dentry *udf_get_parent(struct dentry *child)
1244 {
1245         struct inode *inode = NULL;
1246         struct qstr dotdot = {.name = "..", .len = 2};
1247         struct fileIdentDesc cfi;
1248         struct udf_fileident_bh fibh;
1249
1250         lock_kernel();
1251         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1252                 goto out_unlock;
1253
1254         if (fibh.sbh != fibh.ebh)
1255                 brelse(fibh.ebh);
1256         brelse(fibh.sbh);
1257
1258         inode = udf_iget(child->d_inode->i_sb,
1259                          lelb_to_cpu(cfi.icb.extLocation));
1260         if (!inode)
1261                 goto out_unlock;
1262         unlock_kernel();
1263
1264         return d_obtain_alias(inode);
1265 out_unlock:
1266         unlock_kernel();
1267         return ERR_PTR(-EACCES);
1268 }
1269
1270
1271 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1272                                         u16 partref, __u32 generation)
1273 {
1274         struct inode *inode;
1275         kernel_lb_addr loc;
1276
1277         if (block == 0)
1278                 return ERR_PTR(-ESTALE);
1279
1280         loc.logicalBlockNum = block;
1281         loc.partitionReferenceNum = partref;
1282         inode = udf_iget(sb, loc);
1283
1284         if (inode == NULL)
1285                 return ERR_PTR(-ENOMEM);
1286
1287         if (generation && inode->i_generation != generation) {
1288                 iput(inode);
1289                 return ERR_PTR(-ESTALE);
1290         }
1291         return d_obtain_alias(inode);
1292 }
1293
1294 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1295                                        struct fid *fid, int fh_len, int fh_type)
1296 {
1297         if ((fh_len != 3 && fh_len != 5) ||
1298             (fh_type != FILEID_UDF_WITH_PARENT &&
1299              fh_type != FILEID_UDF_WITHOUT_PARENT))
1300                 return NULL;
1301
1302         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1303                         fid->udf.generation);
1304 }
1305
1306 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1307                                        struct fid *fid, int fh_len, int fh_type)
1308 {
1309         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1310                 return NULL;
1311
1312         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1313                                  fid->udf.parent_partref,
1314                                  fid->udf.parent_generation);
1315 }
1316 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1317                          int connectable)
1318 {
1319         int len = *lenp;
1320         struct inode *inode =  de->d_inode;
1321         kernel_lb_addr location = UDF_I(inode)->i_location;
1322         struct fid *fid = (struct fid *)fh;
1323         int type = FILEID_UDF_WITHOUT_PARENT;
1324
1325         if (len < 3 || (connectable && len < 5))
1326                 return 255;
1327
1328         *lenp = 3;
1329         fid->udf.block = location.logicalBlockNum;
1330         fid->udf.partref = location.partitionReferenceNum;
1331         fid->udf.generation = inode->i_generation;
1332
1333         if (connectable && !S_ISDIR(inode->i_mode)) {
1334                 spin_lock(&de->d_lock);
1335                 inode = de->d_parent->d_inode;
1336                 location = UDF_I(inode)->i_location;
1337                 fid->udf.parent_block = location.logicalBlockNum;
1338                 fid->udf.parent_partref = location.partitionReferenceNum;
1339                 fid->udf.parent_generation = inode->i_generation;
1340                 spin_unlock(&de->d_lock);
1341                 *lenp = 5;
1342                 type = FILEID_UDF_WITH_PARENT;
1343         }
1344
1345         return type;
1346 }
1347
1348 const struct export_operations udf_export_ops = {
1349         .encode_fh      = udf_encode_fh,
1350         .fh_to_dentry   = udf_fh_to_dentry,
1351         .fh_to_parent   = udf_fh_to_parent,
1352         .get_parent     = udf_get_parent,
1353 };
1354
1355 const struct inode_operations udf_dir_inode_operations = {
1356         .lookup                         = udf_lookup,
1357         .create                         = udf_create,
1358         .link                           = udf_link,
1359         .unlink                         = udf_unlink,
1360         .symlink                        = udf_symlink,
1361         .mkdir                          = udf_mkdir,
1362         .rmdir                          = udf_rmdir,
1363         .mknod                          = udf_mknod,
1364         .rename                         = udf_rename,
1365 };