SAFE public projects git trees. - safe/jmp/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(struct 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(struct tag),
 103                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 104
 105         if (fibh->sbh == fibh->ebh) {
 106                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 107                               crclen + sizeof(struct 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(struct 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         struct 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(struct short_ad);
 178                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 179                                 epos.offset -= sizeof(struct 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                 struct 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                 struct kernel_lb_addr loc;
 287
 288                 if (fibh.sbh != fibh.ebh)
 289                         brelse(fibh.ebh);
 290                 brelse(fibh.sbh);
 291
 292                 loc = lelb_to_cpu(cfi.icb.extLocation);
 293                 inode = udf_iget(dir->i_sb, &loc);
 294                 if (!inode) {
 295                         unlock_kernel();
 296                         return ERR_PTR(-EACCES);
 297                 }
 298         }
 299         unlock_kernel();
 300
 301         return d_splice_alias(inode, dentry);
 302 }
 303
 304 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 305                                            struct dentry *dentry,
 306                                            struct udf_fileident_bh *fibh,
 307                                            struct fileIdentDesc *cfi, int *err)
 308 {
 309         struct super_block *sb = dir->i_sb;
 310         struct fileIdentDesc *fi = NULL;
 311         char *name = NULL;
 312         int namelen;
 313         loff_t f_pos;
 314         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 315         int nfidlen;
 316         uint8_t lfi;
 317         uint16_t liu;
 318         int block;
 319         struct kernel_lb_addr eloc;
 320         uint32_t elen = 0;
 321         sector_t offset;
 322         struct extent_position epos = {};
 323         struct udf_inode_info *dinfo;
 324
 325         fibh->sbh = fibh->ebh = NULL;
 326         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 327         if (!name) {
 328                 *err = -ENOMEM;
 329                 goto out_err;
 330         }
 331
 332         if (dentry) {
 333                 if (!dentry->d_name.len) {
 334                         *err = -EINVAL;
 335                         goto out_err;
 336                 }
 337                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
 338                                                  dentry->d_name.len);
 339                 if (!namelen) {
 340                         *err = -ENAMETOOLONG;
 341                         goto out_err;
 342                 }
 343         } else {
 344                 namelen = 0;
 345         }
 346
 347         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 348
 349         f_pos = udf_ext0_offset(dir);
 350
 351         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 352         dinfo = UDF_I(dir);
 353         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 354                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 355                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 356                         block = udf_get_lb_pblock(dir->i_sb,
 357                                         &dinfo->i_location, 0);
 358                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 359                         goto add;
 360                 }
 361                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 362                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 363                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 364                                 epos.offset -= sizeof(struct short_ad);
 365                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 366                                 epos.offset -= sizeof(struct long_ad);
 367                 } else
 368                         offset = 0;
 369
 370                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 371                 if (!fibh->sbh) {
 372                         *err = -EIO;
 373                         goto out_err;
 374                 }
 375
 376                 block = dinfo->i_location.logicalBlockNum;
 377         }
 378
 379         while (f_pos < size) {
 380                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 381                                         &elen, &offset);
 382
 383                 if (!fi) {
 384                         *err = -EIO;
 385                         goto out_err;
 386                 }
 387
 388                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 389                 lfi = cfi->lengthFileIdent;
 390
 391                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 392                         if (((sizeof(struct fileIdentDesc) +
 393                                         liu + lfi + 3) & ~3) == nfidlen) {
 394                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 395                                 cfi->fileVersionNum = cpu_to_le16(1);
 396                                 cfi->fileCharacteristics = 0;
 397                                 cfi->lengthFileIdent = namelen;
 398                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 399                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 400                                                   name))
 401                                         goto out_ok;
 402                                 else {
 403                                         *err = -EIO;
 404                                         goto out_err;
 405                                 }
 406                         }
 407                 }
 408         }
 409
 410 add:
 411         /* Is there any extent whose size we need to round up? */
 412         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) {
 413                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 414                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 415                         epos.offset -= sizeof(struct short_ad);
 416                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 417                         epos.offset -= sizeof(struct long_ad);
 418                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 419         }
 420         f_pos += nfidlen;
 421
 422         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 423             sb->s_blocksize - fibh->eoffset < nfidlen) {
 424                 brelse(epos.bh);
 425                 epos.bh = NULL;
 426                 fibh->soffset -= udf_ext0_offset(dir);
 427                 fibh->eoffset -= udf_ext0_offset(dir);
 428                 f_pos -= udf_ext0_offset(dir);
 429                 if (fibh->sbh != fibh->ebh)
 430                         brelse(fibh->ebh);
 431                 brelse(fibh->sbh);
 432                 fibh->sbh = fibh->ebh =
 433                                 udf_expand_dir_adinicb(dir, &block, err);
 434                 if (!fibh->sbh)
 435                         goto out_err;
 436                 epos.block = dinfo->i_location;
 437                 epos.offset = udf_file_entry_alloc_offset(dir);
 438                 /* Load extent udf_expand_dir_adinicb() has created */
 439                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 440         }
 441
 442         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 443                 fibh->soffset = fibh->eoffset;
 444                 fibh->eoffset += nfidlen;
 445                 if (fibh->sbh != fibh->ebh) {
 446                         brelse(fibh->sbh);
 447                         fibh->sbh = fibh->ebh;
 448                 }
 449
 450                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 451                         block = dinfo->i_location.logicalBlockNum;
 452                         fi = (struct fileIdentDesc *)
 453                                         (dinfo->i_ext.i_data +
 454                                          fibh->soffset -
 455                                          udf_ext0_offset(dir) +
 456                                          dinfo->i_lenEAttr);
 457                 } else {
 458                         block = eloc.logicalBlockNum +
 459                                         ((elen - 1) >>
 460                                                 dir->i_sb->s_blocksize_bits);
 461                         fi = (struct fileIdentDesc *)
 462                                 (fibh->sbh->b_data + fibh->soffset);
 463                 }
 464         } else {
 465                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 466                 fibh->eoffset += nfidlen - sb->s_blocksize;
 467                 if (fibh->sbh != fibh->ebh) {
 468                         brelse(fibh->sbh);
 469                         fibh->sbh = fibh->ebh;
 470                 }
 471
 472                 block = eloc.logicalBlockNum + ((elen - 1) >>
 473                                                 dir->i_sb->s_blocksize_bits);
 474                 fibh->ebh = udf_bread(dir,
 475                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 476                 if (!fibh->ebh)
 477                         goto out_err;
 478
 479                 if (!fibh->soffset) {
 480                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 481                             (EXT_RECORDED_ALLOCATED >> 30)) {
 482                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 483                                         dir->i_sb->s_blocksize_bits);
 484                         } else
 485                                 block++;
 486
 487                         brelse(fibh->sbh);
 488                         fibh->sbh = fibh->ebh;
 489                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 490                 } else {
 491                         fi = (struct fileIdentDesc *)
 492                                 (fibh->sbh->b_data + sb->s_blocksize +
 493                                         fibh->soffset);
 494                 }
 495         }
 496
 497         memset(cfi, 0, sizeof(struct fileIdentDesc));
 498         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 499                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 500                             sizeof(struct tag));
 501         else
 502                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 503                             sizeof(struct tag));
 504         cfi->fileVersionNum = cpu_to_le16(1);
 505         cfi->lengthFileIdent = namelen;
 506         cfi->lengthOfImpUse = cpu_to_le16(0);
 507         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 508                 dir->i_size += nfidlen;
 509                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 510                         dinfo->i_lenAlloc += nfidlen;
 511                 mark_inode_dirty(dir);
 512                 goto out_ok;
 513         } else {
 514                 *err = -EIO;
 515                 goto out_err;
 516         }
 517
 518 out_err:
 519         fi = NULL;
 520         if (fibh->sbh != fibh->ebh)
 521                 brelse(fibh->ebh);
 522         brelse(fibh->sbh);
 523 out_ok:
 524         brelse(epos.bh);
 525         kfree(name);
 526         return fi;
 527 }
 528
 529 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 530                             struct udf_fileident_bh *fibh,
 531                             struct fileIdentDesc *cfi)
 532 {
 533         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 534
 535         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 536                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 537
 538         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 539 }
 540
 541 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
 542                       struct nameidata *nd)
 543 {
 544         struct udf_fileident_bh fibh;
 545         struct inode *inode;
 546         struct fileIdentDesc cfi, *fi;
 547         int err;
 548         struct udf_inode_info *iinfo;
 549
 550         lock_kernel();
 551         inode = udf_new_inode(dir, mode, &err);
 552         if (!inode) {
 553                 unlock_kernel();
 554                 return err;
 555         }
 556
 557         iinfo = UDF_I(inode);
 558         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 559                 inode->i_data.a_ops = &udf_adinicb_aops;
 560         else
 561                 inode->i_data.a_ops = &udf_aops;
 562         inode->i_op = &udf_file_inode_operations;
 563         inode->i_fop = &udf_file_operations;
 564         inode->i_mode = mode;
 565         mark_inode_dirty(inode);
 566
 567         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 568         if (!fi) {
 569                 inode->i_nlink--;
 570                 mark_inode_dirty(inode);
 571                 iput(inode);
 572                 unlock_kernel();
 573                 return err;
 574         }
 575         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 576         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 577         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 578                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 579         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 580         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 581                 mark_inode_dirty(dir);
 582         if (fibh.sbh != fibh.ebh)
 583                 brelse(fibh.ebh);
 584         brelse(fibh.sbh);
 585         unlock_kernel();
 586         d_instantiate(dentry, inode);
 587
 588         return 0;
 589 }
 590
 591 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
 592                      dev_t rdev)
 593 {
 594         struct inode *inode;
 595         struct udf_fileident_bh fibh;
 596         struct fileIdentDesc cfi, *fi;
 597         int err;
 598         struct udf_inode_info *iinfo;
 599
 600         if (!old_valid_dev(rdev))
 601                 return -EINVAL;
 602
 603         lock_kernel();
 604         err = -EIO;
 605         inode = udf_new_inode(dir, mode, &err);
 606         if (!inode)
 607                 goto out;
 608
 609         iinfo = UDF_I(inode);
 610         inode->i_uid = current_fsuid();
 611         init_special_inode(inode, mode, rdev);
 612         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 613         if (!fi) {
 614                 inode->i_nlink--;
 615                 mark_inode_dirty(inode);
 616                 iput(inode);
 617                 unlock_kernel();
 618                 return err;
 619         }
 620         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 621         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 622         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 623                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 624         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 625         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 626                 mark_inode_dirty(dir);
 627         mark_inode_dirty(inode);
 628
 629         if (fibh.sbh != fibh.ebh)
 630                 brelse(fibh.ebh);
 631         brelse(fibh.sbh);
 632         d_instantiate(dentry, inode);
 633         err = 0;
 634
 635 out:
 636         unlock_kernel();
 637         return err;
 638 }
 639
 640 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 641 {
 642         struct inode *inode;
 643         struct udf_fileident_bh fibh;
 644         struct fileIdentDesc cfi, *fi;
 645         int err;
 646         struct udf_inode_info *dinfo = UDF_I(dir);
 647         struct udf_inode_info *iinfo;
 648
 649         lock_kernel();
 650         err = -EMLINK;
 651         if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
 652                 goto out;
 653
 654         err = -EIO;
 655         inode = udf_new_inode(dir, S_IFDIR, &err);
 656         if (!inode)
 657                 goto out;
 658
 659         iinfo = UDF_I(inode);
 660         inode->i_op = &udf_dir_inode_operations;
 661         inode->i_fop = &udf_dir_operations;
 662         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 663         if (!fi) {
 664                 inode->i_nlink--;
 665                 mark_inode_dirty(inode);
 666                 iput(inode);
 667                 goto out;
 668         }
 669         inode->i_nlink = 2;
 670         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 671         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 672         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 673                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 674         cfi.fileCharacteristics =
 675                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 676         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 677         brelse(fibh.sbh);
 678         inode->i_mode = S_IFDIR | mode;
 679         if (dir->i_mode & S_ISGID)
 680                 inode->i_mode |= S_ISGID;
 681         mark_inode_dirty(inode);
 682
 683         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 684         if (!fi) {
 685                 inode->i_nlink = 0;
 686                 mark_inode_dirty(inode);
 687                 iput(inode);
 688                 goto out;
 689         }
 690         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 691         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 692         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 693                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 694         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 695         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 696         inc_nlink(dir);
 697         mark_inode_dirty(dir);
 698         d_instantiate(dentry, inode);
 699         if (fibh.sbh != fibh.ebh)
 700                 brelse(fibh.ebh);
 701         brelse(fibh.sbh);
 702         err = 0;
 703
 704 out:
 705         unlock_kernel();
 706         return err;
 707 }
 708
 709 static int empty_dir(struct inode *dir)
 710 {
 711         struct fileIdentDesc *fi, cfi;
 712         struct udf_fileident_bh fibh;
 713         loff_t f_pos;
 714         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 715         int block;
 716         struct kernel_lb_addr eloc;
 717         uint32_t elen;
 718         sector_t offset;
 719         struct extent_position epos = {};
 720         struct udf_inode_info *dinfo = UDF_I(dir);
 721
 722         f_pos = udf_ext0_offset(dir);
 723         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 724
 725         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 726                 fibh.sbh = fibh.ebh = NULL;
 727         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 728                               &epos, &eloc, &elen, &offset) ==
 729                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 730                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 731                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 732                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 733                                 epos.offset -= sizeof(struct short_ad);
 734                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 735                                 epos.offset -= sizeof(struct long_ad);
 736                 } else
 737                         offset = 0;
 738
 739                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 740                 if (!fibh.sbh) {
 741                         brelse(epos.bh);
 742                         return 0;
 743                 }
 744         } else {
 745                 brelse(epos.bh);
 746                 return 0;
 747         }
 748
 749         while (f_pos < size) {
 750                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 751                                         &elen, &offset);
 752                 if (!fi) {
 753                         if (fibh.sbh != fibh.ebh)
 754                                 brelse(fibh.ebh);
 755                         brelse(fibh.sbh);
 756                         brelse(epos.bh);
 757                         return 0;
 758                 }
 759
 760                 if (cfi.lengthFileIdent &&
 761                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 762                         if (fibh.sbh != fibh.ebh)
 763                                 brelse(fibh.ebh);
 764                         brelse(fibh.sbh);
 765                         brelse(epos.bh);
 766                         return 0;
 767                 }
 768         }
 769
 770         if (fibh.sbh != fibh.ebh)
 771                 brelse(fibh.ebh);
 772         brelse(fibh.sbh);
 773         brelse(epos.bh);
 774
 775         return 1;
 776 }
 777
 778 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 779 {
 780         int retval;
 781         struct inode *inode = dentry->d_inode;
 782         struct udf_fileident_bh fibh;
 783         struct fileIdentDesc *fi, cfi;
 784         struct kernel_lb_addr tloc;
 785
 786         retval = -ENOENT;
 787         lock_kernel();
 788         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 789         if (!fi)
 790                 goto out;
 791
 792         retval = -EIO;
 793         tloc = lelb_to_cpu(cfi.icb.extLocation);
 794         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 795                 goto end_rmdir;
 796         retval = -ENOTEMPTY;
 797         if (!empty_dir(inode))
 798                 goto end_rmdir;
 799         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 800         if (retval)
 801                 goto end_rmdir;
 802         if (inode->i_nlink != 2)
 803                 udf_warning(inode->i_sb, "udf_rmdir",
 804                             "empty directory has nlink != 2 (%d)",
 805                             inode->i_nlink);
 806         clear_nlink(inode);
 807         inode->i_size = 0;
 808         inode_dec_link_count(dir);
 809         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 810                                                 current_fs_time(dir->i_sb);
 811         mark_inode_dirty(dir);
 812
 813 end_rmdir:
 814         if (fibh.sbh != fibh.ebh)
 815                 brelse(fibh.ebh);
 816         brelse(fibh.sbh);
 817
 818 out:
 819         unlock_kernel();
 820         return retval;
 821 }
 822
 823 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 824 {
 825         int retval;
 826         struct inode *inode = dentry->d_inode;
 827         struct udf_fileident_bh fibh;
 828         struct fileIdentDesc *fi;
 829         struct fileIdentDesc cfi;
 830         struct kernel_lb_addr tloc;
 831
 832         retval = -ENOENT;
 833         lock_kernel();
 834         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 835         if (!fi)
 836                 goto out;
 837
 838         retval = -EIO;
 839         tloc = lelb_to_cpu(cfi.icb.extLocation);
 840         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 841                 goto end_unlink;
 842
 843         if (!inode->i_nlink) {
 844                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 845                           inode->i_ino, inode->i_nlink);
 846                 inode->i_nlink = 1;
 847         }
 848         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 849         if (retval)
 850                 goto end_unlink;
 851         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 852         mark_inode_dirty(dir);
 853         inode_dec_link_count(inode);
 854         inode->i_ctime = dir->i_ctime;
 855         retval = 0;
 856
 857 end_unlink:
 858         if (fibh.sbh != fibh.ebh)
 859                 brelse(fibh.ebh);
 860         brelse(fibh.sbh);
 861
 862 out:
 863         unlock_kernel();
 864         return retval;
 865 }
 866
 867 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 868                        const char *symname)
 869 {
 870         struct inode *inode;
 871         struct pathComponent *pc;
 872         char *compstart;
 873         struct udf_fileident_bh fibh;
 874         struct extent_position epos = {};
 875         int eoffset, elen = 0;
 876         struct fileIdentDesc *fi;
 877         struct fileIdentDesc cfi;
 878         char *ea;
 879         int err;
 880         int block;
 881         char *name = NULL;
 882         int namelen;
 883         struct buffer_head *bh;
 884         struct udf_inode_info *iinfo;
 885
 886         lock_kernel();
 887         inode = udf_new_inode(dir, S_IFLNK, &err);
 888         if (!inode)
 889                 goto out;
 890
 891         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 892         if (!name) {
 893                 err = -ENOMEM;
 894                 goto out_no_entry;
 895         }
 896
 897         iinfo = UDF_I(inode);
 898         inode->i_mode = S_IFLNK | S_IRWXUGO;
 899         inode->i_data.a_ops = &udf_symlink_aops;
 900         inode->i_op = &page_symlink_inode_operations;
 901
 902         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 903                 struct kernel_lb_addr eloc;
 904                 uint32_t bsize;
 905
 906                 block = udf_new_block(inode->i_sb, inode,
 907                                 iinfo->i_location.partitionReferenceNum,
 908                                 iinfo->i_location.logicalBlockNum, &err);
 909                 if (!block)
 910                         goto out_no_entry;
 911                 epos.block = iinfo->i_location;
 912                 epos.offset = udf_file_entry_alloc_offset(inode);
 913                 epos.bh = NULL;
 914                 eloc.logicalBlockNum = block;
 915                 eloc.partitionReferenceNum =
 916                                 iinfo->i_location.partitionReferenceNum;
 917                 bsize = inode->i_sb->s_blocksize;
 918                 iinfo->i_lenExtents = bsize;
 919                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 920                 brelse(epos.bh);
 921
 922                 block = udf_get_pblock(inode->i_sb, block,
 923                                 iinfo->i_location.partitionReferenceNum,
 924                                 0);
 925                 epos.bh = udf_tread(inode->i_sb, block);
 926                 lock_buffer(epos.bh);
 927                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
 928                 set_buffer_uptodate(epos.bh);
 929                 unlock_buffer(epos.bh);
 930                 mark_buffer_dirty_inode(epos.bh, inode);
 931                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 932         } else
 933                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 934
 935         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
 936         pc = (struct pathComponent *)ea;
 937
 938         if (*symname == '/') {
 939                 do {
 940                         symname++;
 941                 } while (*symname == '/');
 942
 943                 pc->componentType = 1;
 944                 pc->lengthComponentIdent = 0;
 945                 pc->componentFileVersionNum = 0;
 946                 elen += sizeof(struct pathComponent);
 947         }
 948
 949         err = -ENAMETOOLONG;
 950
 951         while (*symname) {
 952                 if (elen + sizeof(struct pathComponent) > eoffset)
 953                         goto out_no_entry;
 954
 955                 pc = (struct pathComponent *)(ea + elen);
 956
 957                 compstart = (char *)symname;
 958
 959                 do {
 960                         symname++;
 961                 } while (*symname && *symname != '/');
 962
 963                 pc->componentType = 5;
 964                 pc->lengthComponentIdent = 0;
 965                 pc->componentFileVersionNum = 0;
 966                 if (compstart[0] == '.') {
 967                         if ((symname - compstart) == 1)
 968                                 pc->componentType = 4;
 969                         else if ((symname - compstart) == 2 &&
 970                                         compstart[1] == '.')
 971                                 pc->componentType = 3;
 972                 }
 973
 974                 if (pc->componentType == 5) {
 975                         namelen = udf_put_filename(inode->i_sb, compstart, name,
 976                                                    symname - compstart);
 977                         if (!namelen)
 978                                 goto out_no_entry;
 979
 980                         if (elen + sizeof(struct pathComponent) + namelen >
 981                                         eoffset)
 982                                 goto out_no_entry;
 983                         else
 984                                 pc->lengthComponentIdent = namelen;
 985
 986                         memcpy(pc->componentIdent, name, namelen);
 987                 }
 988
 989                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
 990
 991                 if (*symname) {
 992                         do {
 993                                 symname++;
 994                         } while (*symname == '/');
 995                 }
 996         }
 997
 998         brelse(epos.bh);
 999         inode->i_size = elen;
1000         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1001                 iinfo->i_lenAlloc = inode->i_size;
1002         mark_inode_dirty(inode);
1003
1004         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1005         if (!fi)
1006                 goto out_no_entry;
1007         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1008         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1009         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1010         if (bh) {
1011                 struct logicalVolIntegrityDesc *lvid =
1012                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1013                 struct logicalVolHeaderDesc *lvhd;
1014                 uint64_t uniqueID;
1015                 lvhd = (struct logicalVolHeaderDesc *)
1016                                 lvid->logicalVolContentsUse;
1017                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1018                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1019                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1020                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1021                         uniqueID += 16;
1022                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1023                 mark_buffer_dirty(bh);
1024         }
1025         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1026         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1027                 mark_inode_dirty(dir);
1028         if (fibh.sbh != fibh.ebh)
1029                 brelse(fibh.ebh);
1030         brelse(fibh.sbh);
1031         d_instantiate(dentry, inode);
1032         err = 0;
1033
1034 out:
1035         kfree(name);
1036         unlock_kernel();
1037         return err;
1038
1039 out_no_entry:
1040         inode_dec_link_count(inode);
1041         iput(inode);
1042         goto out;
1043 }
1044
1045 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1046                     struct dentry *dentry)
1047 {
1048         struct inode *inode = old_dentry->d_inode;
1049         struct udf_fileident_bh fibh;
1050         struct fileIdentDesc cfi, *fi;
1051         int err;
1052         struct buffer_head *bh;
1053
1054         lock_kernel();
1055         if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1056                 unlock_kernel();
1057                 return -EMLINK;
1058         }
1059
1060         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1061         if (!fi) {
1062                 unlock_kernel();
1063                 return err;
1064         }
1065         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1066         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1067         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1068         if (bh) {
1069                 struct logicalVolIntegrityDesc *lvid =
1070                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1071                 struct logicalVolHeaderDesc *lvhd;
1072                 uint64_t uniqueID;
1073                 lvhd = (struct logicalVolHeaderDesc *)
1074                                 (lvid->logicalVolContentsUse);
1075                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1076                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1077                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1078                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1079                         uniqueID += 16;
1080                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1081                 mark_buffer_dirty(bh);
1082         }
1083         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1084         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1085                 mark_inode_dirty(dir);
1086
1087         if (fibh.sbh != fibh.ebh)
1088                 brelse(fibh.ebh);
1089         brelse(fibh.sbh);
1090         inc_nlink(inode);
1091         inode->i_ctime = current_fs_time(inode->i_sb);
1092         mark_inode_dirty(inode);
1093         atomic_inc(&inode->i_count);
1094         d_instantiate(dentry, inode);
1095         unlock_kernel();
1096
1097         return 0;
1098 }
1099
1100 /* Anybody can rename anything with this: the permission checks are left to the
1101  * higher-level routines.
1102  */
1103 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1104                       struct inode *new_dir, struct dentry *new_dentry)
1105 {
1106         struct inode *old_inode = old_dentry->d_inode;
1107         struct inode *new_inode = new_dentry->d_inode;
1108         struct udf_fileident_bh ofibh, nfibh;
1109         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1110         struct fileIdentDesc ocfi, ncfi;
1111         struct buffer_head *dir_bh = NULL;
1112         int retval = -ENOENT;
1113         struct kernel_lb_addr tloc;
1114         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1115
1116         lock_kernel();
1117         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1118         if (ofi) {
1119                 if (ofibh.sbh != ofibh.ebh)
1120                         brelse(ofibh.ebh);
1121                 brelse(ofibh.sbh);
1122         }
1123         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1124         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1125             != old_inode->i_ino)
1126                 goto end_rename;
1127
1128         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1129         if (nfi) {
1130                 if (!new_inode) {
1131                         if (nfibh.sbh != nfibh.ebh)
1132                                 brelse(nfibh.ebh);
1133                         brelse(nfibh.sbh);
1134                         nfi = NULL;
1135                 }
1136         }
1137         if (S_ISDIR(old_inode->i_mode)) {
1138                 int offset = udf_ext0_offset(old_inode);
1139
1140                 if (new_inode) {
1141                         retval = -ENOTEMPTY;
1142                         if (!empty_dir(new_inode))
1143                                 goto end_rename;
1144                 }
1145                 retval = -EIO;
1146                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1147                         dir_fi = udf_get_fileident(
1148                                         old_iinfo->i_ext.i_data -
1149                                           (old_iinfo->i_efe ?
1150                                            sizeof(struct extendedFileEntry) :
1151                                            sizeof(struct fileEntry)),
1152                                         old_inode->i_sb->s_blocksize, &offset);
1153                 } else {
1154                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1155                         if (!dir_bh)
1156                                 goto end_rename;
1157                         dir_fi = udf_get_fileident(dir_bh->b_data,
1158                                         old_inode->i_sb->s_blocksize, &offset);
1159                 }
1160                 if (!dir_fi)
1161                         goto end_rename;
1162                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1163                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1164                                 old_dir->i_ino)
1165                         goto end_rename;
1166
1167                 retval = -EMLINK;
1168                 if (!new_inode &&
1169                         new_dir->i_nlink >=
1170                                 (256 << sizeof(new_dir->i_nlink)) - 1)
1171                         goto end_rename;
1172         }
1173         if (!nfi) {
1174                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1175                                     &retval);
1176                 if (!nfi)
1177                         goto end_rename;
1178         }
1179
1180         /*
1181          * Like most other Unix systems, set the ctime for inodes on a
1182          * rename.
1183          */
1184         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1185         mark_inode_dirty(old_inode);
1186
1187         /*
1188          * ok, that's it
1189          */
1190         ncfi.fileVersionNum = ocfi.fileVersionNum;
1191         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1192         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1193         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1194
1195         /* The old fid may have moved - find it again */
1196         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1197         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1198
1199         if (new_inode) {
1200                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1201                 inode_dec_link_count(new_inode);
1202         }
1203         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1204         mark_inode_dirty(old_dir);
1205
1206         if (dir_fi) {
1207                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1208                 udf_update_tag((char *)dir_fi,
1209                                 (sizeof(struct fileIdentDesc) +
1210                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1211                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1212                         mark_inode_dirty(old_inode);
1213                 else
1214                         mark_buffer_dirty_inode(dir_bh, old_inode);
1215
1216                 inode_dec_link_count(old_dir);
1217                 if (new_inode)
1218                         inode_dec_link_count(new_inode);
1219                 else {
1220                         inc_nlink(new_dir);
1221                         mark_inode_dirty(new_dir);
1222                 }
1223         }
1224
1225         if (ofi) {
1226                 if (ofibh.sbh != ofibh.ebh)
1227                         brelse(ofibh.ebh);
1228                 brelse(ofibh.sbh);
1229         }
1230
1231         retval = 0;
1232
1233 end_rename:
1234         brelse(dir_bh);
1235         if (nfi) {
1236                 if (nfibh.sbh != nfibh.ebh)
1237                         brelse(nfibh.ebh);
1238                 brelse(nfibh.sbh);
1239         }
1240         unlock_kernel();
1241
1242         return retval;
1243 }
1244
1245 static struct dentry *udf_get_parent(struct dentry *child)
1246 {
1247         struct kernel_lb_addr tloc;
1248         struct inode *inode = NULL;
1249         struct qstr dotdot = {.name = "..", .len = 2};
1250         struct fileIdentDesc cfi;
1251         struct udf_fileident_bh fibh;
1252
1253         lock_kernel();
1254         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1255                 goto out_unlock;
1256
1257         if (fibh.sbh != fibh.ebh)
1258                 brelse(fibh.ebh);
1259         brelse(fibh.sbh);
1260
1261         tloc = lelb_to_cpu(cfi.icb.extLocation);
1262         inode = udf_iget(child->d_inode->i_sb, &tloc);
1263         if (!inode)
1264                 goto out_unlock;
1265         unlock_kernel();
1266
1267         return d_obtain_alias(inode);
1268 out_unlock:
1269         unlock_kernel();
1270         return ERR_PTR(-EACCES);
1271 }
1272
1273
1274 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1275                                         u16 partref, __u32 generation)
1276 {
1277         struct inode *inode;
1278         struct kernel_lb_addr loc;
1279
1280         if (block == 0)
1281                 return ERR_PTR(-ESTALE);
1282
1283         loc.logicalBlockNum = block;
1284         loc.partitionReferenceNum = partref;
1285         inode = udf_iget(sb, &loc);
1286
1287         if (inode == NULL)
1288                 return ERR_PTR(-ENOMEM);
1289
1290         if (generation && inode->i_generation != generation) {
1291                 iput(inode);
1292                 return ERR_PTR(-ESTALE);
1293         }
1294         return d_obtain_alias(inode);
1295 }
1296
1297 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1298                                        struct fid *fid, int fh_len, int fh_type)
1299 {
1300         if ((fh_len != 3 && fh_len != 5) ||
1301             (fh_type != FILEID_UDF_WITH_PARENT &&
1302              fh_type != FILEID_UDF_WITHOUT_PARENT))
1303                 return NULL;
1304
1305         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1306                         fid->udf.generation);
1307 }
1308
1309 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1310                                        struct fid *fid, int fh_len, int fh_type)
1311 {
1312         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1313                 return NULL;
1314
1315         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1316                                  fid->udf.parent_partref,
1317                                  fid->udf.parent_generation);
1318 }
1319 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1320                          int connectable)
1321 {
1322         int len = *lenp;
1323         struct inode *inode =  de->d_inode;
1324         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1325         struct fid *fid = (struct fid *)fh;
1326         int type = FILEID_UDF_WITHOUT_PARENT;
1327
1328         if (len < 3 || (connectable && len < 5))
1329                 return 255;
1330
1331         *lenp = 3;
1332         fid->udf.block = location.logicalBlockNum;
1333         fid->udf.partref = location.partitionReferenceNum;
1334         fid->udf.generation = inode->i_generation;
1335
1336         if (connectable && !S_ISDIR(inode->i_mode)) {
1337                 spin_lock(&de->d_lock);
1338                 inode = de->d_parent->d_inode;
1339                 location = UDF_I(inode)->i_location;
1340                 fid->udf.parent_block = location.logicalBlockNum;
1341                 fid->udf.parent_partref = location.partitionReferenceNum;
1342                 fid->udf.parent_generation = inode->i_generation;
1343                 spin_unlock(&de->d_lock);
1344                 *lenp = 5;
1345                 type = FILEID_UDF_WITH_PARENT;
1346         }
1347
1348         return type;
1349 }
1350
1351 const struct export_operations udf_export_ops = {
1352         .encode_fh      = udf_encode_fh,
1353         .fh_to_dentry   = udf_fh_to_dentry,
1354         .fh_to_parent   = udf_fh_to_parent,
1355         .get_parent     = udf_get_parent,
1356 };
1357
1358 const struct inode_operations udf_dir_inode_operations = {
1359         .lookup                         = udf_lookup,
1360         .create                         = udf_create,
1361         .link                           = udf_link,
1362         .unlink                         = udf_unlink,
1363         .symlink                        = udf_symlink,
1364         .mkdir                          = udf_mkdir,
1365         .rmdir                          = udf_rmdir,
1366         .mknod                          = udf_mknod,
1367         .rename                         = udf_rename,
1368 };