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/sched.h>
  31 #include <linux/crc-itu-t.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/iversion.h>
  34
  35 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  36                             const unsigned char *name2)
  37 {
  38         if (len1 != len2)
  39                 return 0;
  40
  41         return !memcmp(name1, name2, len1);
  42 }
  43
  44 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  45                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  46                  uint8_t *impuse, uint8_t *fileident)
  47 {
  48         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  49         uint16_t crc;
  50         int offset;
  51         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  52         uint8_t lfi = cfi->lengthFileIdent;
  53         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  54                 sizeof(struct fileIdentDesc);
  55         int adinicb = 0;
  56
  57         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  58                 adinicb = 1;
  59
  60         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  61
  62         if (impuse) {
  63                 if (adinicb || (offset + liu < 0)) {
  64                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  65                 } else if (offset >= 0) {
  66                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  67                 } else {
  68                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  69                         memcpy(fibh->ebh->b_data, impuse - offset,
  70                                 liu + offset);
  71                 }
  72         }
  73
  74         offset += liu;
  75
  76         if (fileident) {
  77                 if (adinicb || (offset + lfi < 0)) {
  78                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  79                 } else if (offset >= 0) {
  80                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  81                 } else {
  82                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  83                                 -offset);
  84                         memcpy(fibh->ebh->b_data, fileident - offset,
  85                                 lfi + offset);
  86                 }
  87         }
  88
  89         offset += lfi;
  90
  91         if (adinicb || (offset + padlen < 0)) {
  92                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  93         } else if (offset >= 0) {
  94                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  95         } else {
  96                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  97                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  98         }
  99
 100         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
 101                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 102
 103         if (fibh->sbh == fibh->ebh) {
 104                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 105                               crclen + sizeof(struct tag) -
 106                               sizeof(struct fileIdentDesc));
 107         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 108                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 109                                         sizeof(struct fileIdentDesc) +
 110                                         fibh->soffset,
 111                               crclen + sizeof(struct tag) -
 112                                         sizeof(struct fileIdentDesc));
 113         } else {
 114                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 115                               -fibh->soffset - sizeof(struct fileIdentDesc));
 116                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 117         }
 118
 119         cfi->descTag.descCRC = cpu_to_le16(crc);
 120         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 121         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 122
 123         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 124                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 125                         sizeof(struct fileIdentDesc));
 126         } else {
 127                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 128                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 129                        sizeof(struct fileIdentDesc) + fibh->soffset);
 130         }
 131
 132         if (adinicb) {
 133                 mark_inode_dirty(inode);
 134         } else {
 135                 if (fibh->sbh != fibh->ebh)
 136                         mark_buffer_dirty_inode(fibh->ebh, inode);
 137                 mark_buffer_dirty_inode(fibh->sbh, inode);
 138         }
 139         inode_inc_iversion(inode);
 140
 141         return 0;
 142 }
 143
 144 /**
 145  * udf_find_entry - find entry in given directory.
 146  *
 147  * @dir:        directory inode to search in
 148  * @child:      qstr of the name
 149  * @fibh:       buffer head / inode with file identifier descriptor we found
 150  * @cfi:        found file identifier descriptor with given name
 151  *
 152  * This function searches in the directory @dir for a file name @child. When
 153  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 154  * directories) containing the file identifier descriptor (FID). In that case
 155  * the function returns pointer to the FID in the buffer or inode - but note
 156  * that FID may be split among two buffers (blocks) so accessing it via that
 157  * pointer isn't easily possible. This pointer can be used only as an iterator
 158  * for other directory manipulation functions. For inspection of the FID @cfi
 159  * can be used - the found FID is copied there.
 160  *
 161  * Returns pointer to FID, NULL when nothing found, or error code.
 162  */
 163 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 164                                             const struct qstr *child,
 165                                             struct udf_fileident_bh *fibh,
 166                                             struct fileIdentDesc *cfi)
 167 {
 168         struct fileIdentDesc *fi = NULL;
 169         loff_t f_pos;
 170         udf_pblk_t block;
 171         int flen;
 172         unsigned char *fname = NULL, *copy_name = NULL;
 173         unsigned char *nameptr;
 174         uint8_t lfi;
 175         uint16_t liu;
 176         loff_t size;
 177         struct kernel_lb_addr eloc;
 178         uint32_t elen;
 179         sector_t offset;
 180         struct extent_position epos = {};
 181         struct udf_inode_info *dinfo = UDF_I(dir);
 182         int isdotdot = child->len == 2 &&
 183                 child->name[0] == '.' && child->name[1] == '.';
 184         struct super_block *sb = dir->i_sb;
 185
 186         size = udf_ext0_offset(dir) + dir->i_size;
 187         f_pos = udf_ext0_offset(dir);
 188
 189         fibh->sbh = fibh->ebh = NULL;
 190         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 191         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 192                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 193                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 194                         fi = ERR_PTR(-EIO);
 195                         goto out_err;
 196                 }
 197
 198                 block = udf_get_lb_pblock(sb, &eloc, offset);
 199                 if ((++offset << sb->s_blocksize_bits) < elen) {
 200                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 201                                 epos.offset -= sizeof(struct short_ad);
 202                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 203                                 epos.offset -= sizeof(struct long_ad);
 204                 } else
 205                         offset = 0;
 206
 207                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 208                 if (!fibh->sbh) {
 209                         fi = ERR_PTR(-EIO);
 210                         goto out_err;
 211                 }
 212         }
 213
 214         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 215         if (!fname) {
 216                 fi = ERR_PTR(-ENOMEM);
 217                 goto out_err;
 218         }
 219
 220         while (f_pos < size) {
 221                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 222                                         &elen, &offset);
 223                 if (!fi) {
 224                         fi = ERR_PTR(-EIO);
 225                         goto out_err;
 226                 }
 227
 228                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 229                 lfi = cfi->lengthFileIdent;
 230
 231                 if (fibh->sbh == fibh->ebh) {
 232                         nameptr = fi->fileIdent + liu;
 233                 } else {
 234                         int poffset;    /* Unpaded ending offset */
 235
 236                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 237                                         liu + lfi;
 238
 239                         if (poffset >= lfi)
 240                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 241                                                       poffset - lfi);
 242                         else {
 243                                 if (!copy_name) {
 244                                         copy_name = kmalloc(UDF_NAME_LEN_CS0,
 245                                                             GFP_NOFS);
 246                                         if (!copy_name) {
 247                                                 fi = ERR_PTR(-ENOMEM);
 248                                                 goto out_err;
 249                                         }
 250                                 }
 251                                 nameptr = copy_name;
 252                                 memcpy(nameptr, fi->fileIdent + liu,
 253                                         lfi - poffset);
 254                                 memcpy(nameptr + lfi - poffset,
 255                                         fibh->ebh->b_data, poffset);
 256                         }
 257                 }
 258
 259                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 260                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 261                                 continue;
 262                 }
 263
 264                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 265                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 266                                 continue;
 267                 }
 268
 269                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 270                     isdotdot)
 271                         goto out_ok;
 272
 273                 if (!lfi)
 274                         continue;
 275
 276                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 277                 if (flen < 0) {
 278                         fi = ERR_PTR(flen);
 279                         goto out_err;
 280                 }
 281
 282                 if (udf_match(flen, fname, child->len, child->name))
 283                         goto out_ok;
 284         }
 285
 286         fi = NULL;
 287 out_err:
 288         if (fibh->sbh != fibh->ebh)
 289                 brelse(fibh->ebh);
 290         brelse(fibh->sbh);
 291 out_ok:
 292         brelse(epos.bh);
 293         kfree(fname);
 294         kfree(copy_name);
 295
 296         return fi;
 297 }
 298
 299 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 300                                  unsigned int flags)
 301 {
 302         struct inode *inode = NULL;
 303         struct fileIdentDesc cfi;
 304         struct udf_fileident_bh fibh;
 305         struct fileIdentDesc *fi;
 306
 307         if (dentry->d_name.len > UDF_NAME_LEN)
 308                 return ERR_PTR(-ENAMETOOLONG);
 309
 310 #ifdef UDF_RECOVERY
 311         /* temporary shorthand for specifying files by inode number */
 312         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 313                 struct kernel_lb_addr lb = {
 314                         .logicalBlockNum = 0,
 315                         .partitionReferenceNum =
 316                                 simple_strtoul(dentry->d_name.name + 3,
 317                                                 NULL, 0),
 318                 };
 319                 inode = udf_iget(dir->i_sb, lb);
 320                 if (IS_ERR(inode))
 321                         return inode;
 322         } else
 323 #endif /* UDF_RECOVERY */
 324
 325         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 326         if (IS_ERR(fi))
 327                 return ERR_CAST(fi);
 328
 329         if (fi) {
 330                 struct kernel_lb_addr loc;
 331
 332                 if (fibh.sbh != fibh.ebh)
 333                         brelse(fibh.ebh);
 334                 brelse(fibh.sbh);
 335
 336                 loc = lelb_to_cpu(cfi.icb.extLocation);
 337                 inode = udf_iget(dir->i_sb, &loc);
 338                 if (IS_ERR(inode))
 339                         return ERR_CAST(inode);
 340         }
 341
 342         return d_splice_alias(inode, dentry);
 343 }
 344
 345 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 346                                            struct dentry *dentry,
 347                                            struct udf_fileident_bh *fibh,
 348                                            struct fileIdentDesc *cfi, int *err)
 349 {
 350         struct super_block *sb = dir->i_sb;
 351         struct fileIdentDesc *fi = NULL;
 352         unsigned char *name = NULL;
 353         int namelen;
 354         loff_t f_pos;
 355         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 356         int nfidlen;
 357         udf_pblk_t block;
 358         struct kernel_lb_addr eloc;
 359         uint32_t elen = 0;
 360         sector_t offset;
 361         struct extent_position epos = {};
 362         struct udf_inode_info *dinfo;
 363
 364         fibh->sbh = fibh->ebh = NULL;
 365         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 366         if (!name) {
 367                 *err = -ENOMEM;
 368                 goto out_err;
 369         }
 370
 371         if (dentry) {
 372                 if (!dentry->d_name.len) {
 373                         *err = -EINVAL;
 374                         goto out_err;
 375                 }
 376                 namelen = udf_put_filename(sb, dentry->d_name.name,
 377                                            dentry->d_name.len,
 378                                            name, UDF_NAME_LEN_CS0);
 379                 if (!namelen) {
 380                         *err = -ENAMETOOLONG;
 381                         goto out_err;
 382                 }
 383         } else {
 384                 namelen = 0;
 385         }
 386
 387         nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 388
 389         f_pos = udf_ext0_offset(dir);
 390
 391         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 392         dinfo = UDF_I(dir);
 393         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 394                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 395                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 396                         block = udf_get_lb_pblock(dir->i_sb,
 397                                         &dinfo->i_location, 0);
 398                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 399                         goto add;
 400                 }
 401                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 402                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 403                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 404                                 epos.offset -= sizeof(struct short_ad);
 405                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 406                                 epos.offset -= sizeof(struct long_ad);
 407                 } else
 408                         offset = 0;
 409
 410                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 411                 if (!fibh->sbh) {
 412                         *err = -EIO;
 413                         goto out_err;
 414                 }
 415
 416                 block = dinfo->i_location.logicalBlockNum;
 417         }
 418
 419         while (f_pos < size) {
 420                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 421                                         &elen, &offset);
 422
 423                 if (!fi) {
 424                         *err = -EIO;
 425                         goto out_err;
 426                 }
 427
 428                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 429                         if (udf_dir_entry_len(cfi) == nfidlen) {
 430                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 431                                 cfi->fileVersionNum = cpu_to_le16(1);
 432                                 cfi->fileCharacteristics = 0;
 433                                 cfi->lengthFileIdent = namelen;
 434                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 435                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 436                                                   name))
 437                                         goto out_ok;
 438                                 else {
 439                                         *err = -EIO;
 440                                         goto out_err;
 441                                 }
 442                         }
 443                 }
 444         }
 445
 446 add:
 447         f_pos += nfidlen;
 448
 449         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 450             sb->s_blocksize - fibh->eoffset < nfidlen) {
 451                 brelse(epos.bh);
 452                 epos.bh = NULL;
 453                 fibh->soffset -= udf_ext0_offset(dir);
 454                 fibh->eoffset -= udf_ext0_offset(dir);
 455                 f_pos -= udf_ext0_offset(dir);
 456                 if (fibh->sbh != fibh->ebh)
 457                         brelse(fibh->ebh);
 458                 brelse(fibh->sbh);
 459                 fibh->sbh = fibh->ebh =
 460                                 udf_expand_dir_adinicb(dir, &block, err);
 461                 if (!fibh->sbh)
 462                         goto out_err;
 463                 epos.block = dinfo->i_location;
 464                 epos.offset = udf_file_entry_alloc_offset(dir);
 465                 /* Load extent udf_expand_dir_adinicb() has created */
 466                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 467         }
 468
 469         /* Entry fits into current block? */
 470         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 471                 fibh->soffset = fibh->eoffset;
 472                 fibh->eoffset += nfidlen;
 473                 if (fibh->sbh != fibh->ebh) {
 474                         brelse(fibh->sbh);
 475                         fibh->sbh = fibh->ebh;
 476                 }
 477
 478                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 479                         block = dinfo->i_location.logicalBlockNum;
 480                         fi = (struct fileIdentDesc *)
 481                                         (dinfo->i_data + fibh->soffset -
 482                                          udf_ext0_offset(dir) +
 483                                          dinfo->i_lenEAttr);
 484                 } else {
 485                         block = eloc.logicalBlockNum +
 486                                         ((elen - 1) >>
 487                                                 dir->i_sb->s_blocksize_bits);
 488                         fi = (struct fileIdentDesc *)
 489                                 (fibh->sbh->b_data + fibh->soffset);
 490                 }
 491         } else {
 492                 /* Round up last extent in the file */
 493                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 494                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 495                         epos.offset -= sizeof(struct short_ad);
 496                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 497                         epos.offset -= sizeof(struct long_ad);
 498                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 499                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 500                                         - 1) & ~(sb->s_blocksize - 1);
 501
 502                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 503                 fibh->eoffset += nfidlen - sb->s_blocksize;
 504                 if (fibh->sbh != fibh->ebh) {
 505                         brelse(fibh->sbh);
 506                         fibh->sbh = fibh->ebh;
 507                 }
 508
 509                 block = eloc.logicalBlockNum + ((elen - 1) >>
 510                                                 dir->i_sb->s_blocksize_bits);
 511                 fibh->ebh = udf_bread(dir,
 512                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 513                 if (!fibh->ebh)
 514                         goto out_err;
 515                 /* Extents could have been merged, invalidate our position */
 516                 brelse(epos.bh);
 517                 epos.bh = NULL;
 518                 epos.block = dinfo->i_location;
 519                 epos.offset = udf_file_entry_alloc_offset(dir);
 520
 521                 if (!fibh->soffset) {
 522                         /* Find the freshly allocated block */
 523                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 524                                 (EXT_RECORDED_ALLOCATED >> 30))
 525                                 ;
 526                         block = eloc.logicalBlockNum + ((elen - 1) >>
 527                                         dir->i_sb->s_blocksize_bits);
 528                         brelse(fibh->sbh);
 529                         fibh->sbh = fibh->ebh;
 530                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 531                 } else {
 532                         fi = (struct fileIdentDesc *)
 533                                 (fibh->sbh->b_data + sb->s_blocksize +
 534                                         fibh->soffset);
 535                 }
 536         }
 537
 538         memset(cfi, 0, sizeof(struct fileIdentDesc));
 539         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 540                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 541                             sizeof(struct tag));
 542         else
 543                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 544                             sizeof(struct tag));
 545         cfi->fileVersionNum = cpu_to_le16(1);
 546         cfi->lengthFileIdent = namelen;
 547         cfi->lengthOfImpUse = cpu_to_le16(0);
 548         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 549                 dir->i_size += nfidlen;
 550                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 551                         dinfo->i_lenAlloc += nfidlen;
 552                 else {
 553                         /* Find the last extent and truncate it to proper size */
 554                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 555                                 (EXT_RECORDED_ALLOCATED >> 30))
 556                                 ;
 557                         elen -= dinfo->i_lenExtents - dir->i_size;
 558                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 559                                 epos.offset -= sizeof(struct short_ad);
 560                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 561                                 epos.offset -= sizeof(struct long_ad);
 562                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 563                         dinfo->i_lenExtents = dir->i_size;
 564                 }
 565
 566                 mark_inode_dirty(dir);
 567                 goto out_ok;
 568         } else {
 569                 *err = -EIO;
 570                 goto out_err;
 571         }
 572
 573 out_err:
 574         fi = NULL;
 575         if (fibh->sbh != fibh->ebh)
 576                 brelse(fibh->ebh);
 577         brelse(fibh->sbh);
 578 out_ok:
 579         brelse(epos.bh);
 580         kfree(name);
 581         return fi;
 582 }
 583
 584 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 585                             struct udf_fileident_bh *fibh,
 586                             struct fileIdentDesc *cfi)
 587 {
 588         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 589
 590         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 591                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 592
 593         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 594 }
 595
 596 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 597 {
 598         struct udf_inode_info *iinfo = UDF_I(inode);
 599         struct inode *dir = d_inode(dentry->d_parent);
 600         struct udf_fileident_bh fibh;
 601         struct fileIdentDesc cfi, *fi;
 602         int err;
 603
 604         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 605         if (unlikely(!fi)) {
 606                 inode_dec_link_count(inode);
 607                 discard_new_inode(inode);
 608                 return err;
 609         }
 610         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 611         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 612         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 613                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 614         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 615         dir->i_ctime = dir->i_mtime = current_time(dir);
 616         mark_inode_dirty(dir);
 617         if (fibh.sbh != fibh.ebh)
 618                 brelse(fibh.ebh);
 619         brelse(fibh.sbh);
 620         d_instantiate_new(dentry, inode);
 621
 622         return 0;
 623 }
 624
 625 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 626                       bool excl)
 627 {
 628         struct inode *inode = udf_new_inode(dir, mode);
 629
 630         if (IS_ERR(inode))
 631                 return PTR_ERR(inode);
 632
 633         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 634                 inode->i_data.a_ops = &udf_adinicb_aops;
 635         else
 636                 inode->i_data.a_ops = &udf_aops;
 637         inode->i_op = &udf_file_inode_operations;
 638         inode->i_fop = &udf_file_operations;
 639         mark_inode_dirty(inode);
 640
 641         return udf_add_nondir(dentry, inode);
 642 }
 643
 644 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 645 {
 646         struct inode *inode = udf_new_inode(dir, mode);
 647
 648         if (IS_ERR(inode))
 649                 return PTR_ERR(inode);
 650
 651         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 652                 inode->i_data.a_ops = &udf_adinicb_aops;
 653         else
 654                 inode->i_data.a_ops = &udf_aops;
 655         inode->i_op = &udf_file_inode_operations;
 656         inode->i_fop = &udf_file_operations;
 657         mark_inode_dirty(inode);
 658         d_tmpfile(dentry, inode);
 659         unlock_new_inode(inode);
 660         return 0;
 661 }
 662
 663 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 664                      dev_t rdev)
 665 {
 666         struct inode *inode;
 667
 668         if (!old_valid_dev(rdev))
 669                 return -EINVAL;
 670
 671         inode = udf_new_inode(dir, mode);
 672         if (IS_ERR(inode))
 673                 return PTR_ERR(inode);
 674
 675         init_special_inode(inode, mode, rdev);
 676         return udf_add_nondir(dentry, inode);
 677 }
 678
 679 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 680 {
 681         struct inode *inode;
 682         struct udf_fileident_bh fibh;
 683         struct fileIdentDesc cfi, *fi;
 684         int err;
 685         struct udf_inode_info *dinfo = UDF_I(dir);
 686         struct udf_inode_info *iinfo;
 687
 688         inode = udf_new_inode(dir, S_IFDIR | mode);
 689         if (IS_ERR(inode))
 690                 return PTR_ERR(inode);
 691
 692         iinfo = UDF_I(inode);
 693         inode->i_op = &udf_dir_inode_operations;
 694         inode->i_fop = &udf_dir_operations;
 695         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 696         if (!fi) {
 697                 inode_dec_link_count(inode);
 698                 discard_new_inode(inode);
 699                 goto out;
 700         }
 701         set_nlink(inode, 2);
 702         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 703         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 704         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 705                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 706         cfi.fileCharacteristics =
 707                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 708         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 709         brelse(fibh.sbh);
 710         mark_inode_dirty(inode);
 711
 712         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 713         if (!fi) {
 714                 clear_nlink(inode);
 715                 mark_inode_dirty(inode);
 716                 discard_new_inode(inode);
 717                 goto out;
 718         }
 719         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 720         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 721         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 722                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 723         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 724         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 725         inc_nlink(dir);
 726         dir->i_ctime = dir->i_mtime = current_time(dir);
 727         mark_inode_dirty(dir);
 728         d_instantiate_new(dentry, inode);
 729         if (fibh.sbh != fibh.ebh)
 730                 brelse(fibh.ebh);
 731         brelse(fibh.sbh);
 732         err = 0;
 733
 734 out:
 735         return err;
 736 }
 737
 738 static int empty_dir(struct inode *dir)
 739 {
 740         struct fileIdentDesc *fi, cfi;
 741         struct udf_fileident_bh fibh;
 742         loff_t f_pos;
 743         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 744         udf_pblk_t block;
 745         struct kernel_lb_addr eloc;
 746         uint32_t elen;
 747         sector_t offset;
 748         struct extent_position epos = {};
 749         struct udf_inode_info *dinfo = UDF_I(dir);
 750
 751         f_pos = udf_ext0_offset(dir);
 752         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 753
 754         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 755                 fibh.sbh = fibh.ebh = NULL;
 756         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 757                               &epos, &eloc, &elen, &offset) ==
 758                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 759                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 760                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 761                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 762                                 epos.offset -= sizeof(struct short_ad);
 763                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 764                                 epos.offset -= sizeof(struct long_ad);
 765                 } else
 766                         offset = 0;
 767
 768                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 769                 if (!fibh.sbh) {
 770                         brelse(epos.bh);
 771                         return 0;
 772                 }
 773         } else {
 774                 brelse(epos.bh);
 775                 return 0;
 776         }
 777
 778         while (f_pos < size) {
 779                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 780                                         &elen, &offset);
 781                 if (!fi) {
 782                         if (fibh.sbh != fibh.ebh)
 783                                 brelse(fibh.ebh);
 784                         brelse(fibh.sbh);
 785                         brelse(epos.bh);
 786                         return 0;
 787                 }
 788
 789                 if (cfi.lengthFileIdent &&
 790                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 791                         if (fibh.sbh != fibh.ebh)
 792                                 brelse(fibh.ebh);
 793                         brelse(fibh.sbh);
 794                         brelse(epos.bh);
 795                         return 0;
 796                 }
 797         }
 798
 799         if (fibh.sbh != fibh.ebh)
 800                 brelse(fibh.ebh);
 801         brelse(fibh.sbh);
 802         brelse(epos.bh);
 803
 804         return 1;
 805 }
 806
 807 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 808 {
 809         int retval;
 810         struct inode *inode = d_inode(dentry);
 811         struct udf_fileident_bh fibh;
 812         struct fileIdentDesc *fi, cfi;
 813         struct kernel_lb_addr tloc;
 814
 815         retval = -ENOENT;
 816         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 817         if (IS_ERR_OR_NULL(fi)) {
 818                 if (fi)
 819                         retval = PTR_ERR(fi);
 820                 goto out;
 821         }
 822
 823         retval = -EIO;
 824         tloc = lelb_to_cpu(cfi.icb.extLocation);
 825         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 826                 goto end_rmdir;
 827         retval = -ENOTEMPTY;
 828         if (!empty_dir(inode))
 829                 goto end_rmdir;
 830         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 831         if (retval)
 832                 goto end_rmdir;
 833         if (inode->i_nlink != 2)
 834                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 835                          inode->i_nlink);
 836         clear_nlink(inode);
 837         inode->i_size = 0;
 838         inode_dec_link_count(dir);
 839         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 840                                                 current_time(inode);
 841         mark_inode_dirty(dir);
 842
 843 end_rmdir:
 844         if (fibh.sbh != fibh.ebh)
 845                 brelse(fibh.ebh);
 846         brelse(fibh.sbh);
 847
 848 out:
 849         return retval;
 850 }
 851
 852 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 853 {
 854         int retval;
 855         struct inode *inode = d_inode(dentry);
 856         struct udf_fileident_bh fibh;
 857         struct fileIdentDesc *fi;
 858         struct fileIdentDesc cfi;
 859         struct kernel_lb_addr tloc;
 860
 861         retval = -ENOENT;
 862         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 863
 864         if (IS_ERR_OR_NULL(fi)) {
 865                 if (fi)
 866                         retval = PTR_ERR(fi);
 867                 goto out;
 868         }
 869
 870         retval = -EIO;
 871         tloc = lelb_to_cpu(cfi.icb.extLocation);
 872         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 873                 goto end_unlink;
 874
 875         if (!inode->i_nlink) {
 876                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 877                           inode->i_ino, inode->i_nlink);
 878                 set_nlink(inode, 1);
 879         }
 880         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 881         if (retval)
 882                 goto end_unlink;
 883         dir->i_ctime = dir->i_mtime = current_time(dir);
 884         mark_inode_dirty(dir);
 885         inode_dec_link_count(inode);
 886         inode->i_ctime = dir->i_ctime;
 887         retval = 0;
 888
 889 end_unlink:
 890         if (fibh.sbh != fibh.ebh)
 891                 brelse(fibh.ebh);
 892         brelse(fibh.sbh);
 893
 894 out:
 895         return retval;
 896 }
 897
 898 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 899                        const char *symname)
 900 {
 901         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 902         struct pathComponent *pc;
 903         const char *compstart;
 904         struct extent_position epos = {};
 905         int eoffset, elen = 0;
 906         uint8_t *ea;
 907         int err;
 908         udf_pblk_t block;
 909         unsigned char *name = NULL;
 910         int namelen;
 911         struct udf_inode_info *iinfo;
 912         struct super_block *sb = dir->i_sb;
 913
 914         if (IS_ERR(inode))
 915                 return PTR_ERR(inode);
 916
 917         iinfo = UDF_I(inode);
 918         down_write(&iinfo->i_data_sem);
 919         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 920         if (!name) {
 921                 err = -ENOMEM;
 922                 goto out_no_entry;
 923         }
 924
 925         inode->i_data.a_ops = &udf_symlink_aops;
 926         inode->i_op = &udf_symlink_inode_operations;
 927         inode_nohighmem(inode);
 928
 929         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 930                 struct kernel_lb_addr eloc;
 931                 uint32_t bsize;
 932
 933                 block = udf_new_block(sb, inode,
 934                                 iinfo->i_location.partitionReferenceNum,
 935                                 iinfo->i_location.logicalBlockNum, &err);
 936                 if (!block)
 937                         goto out_no_entry;
 938                 epos.block = iinfo->i_location;
 939                 epos.offset = udf_file_entry_alloc_offset(inode);
 940                 epos.bh = NULL;
 941                 eloc.logicalBlockNum = block;
 942                 eloc.partitionReferenceNum =
 943                                 iinfo->i_location.partitionReferenceNum;
 944                 bsize = sb->s_blocksize;
 945                 iinfo->i_lenExtents = bsize;
 946                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 947                 brelse(epos.bh);
 948
 949                 block = udf_get_pblock(sb, block,
 950                                 iinfo->i_location.partitionReferenceNum,
 951                                 0);
 952                 epos.bh = udf_tgetblk(sb, block);
 953                 if (unlikely(!epos.bh)) {
 954                         err = -ENOMEM;
 955                         goto out_no_entry;
 956                 }
 957                 lock_buffer(epos.bh);
 958                 memset(epos.bh->b_data, 0x00, bsize);
 959                 set_buffer_uptodate(epos.bh);
 960                 unlock_buffer(epos.bh);
 961                 mark_buffer_dirty_inode(epos.bh, inode);
 962                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 963         } else
 964                 ea = iinfo->i_data + iinfo->i_lenEAttr;
 965
 966         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 967         pc = (struct pathComponent *)ea;
 968
 969         if (*symname == '/') {
 970                 do {
 971                         symname++;
 972                 } while (*symname == '/');
 973
 974                 pc->componentType = 1;
 975                 pc->lengthComponentIdent = 0;
 976                 pc->componentFileVersionNum = 0;
 977                 elen += sizeof(struct pathComponent);
 978         }
 979
 980         err = -ENAMETOOLONG;
 981
 982         while (*symname) {
 983                 if (elen + sizeof(struct pathComponent) > eoffset)
 984                         goto out_no_entry;
 985
 986                 pc = (struct pathComponent *)(ea + elen);
 987
 988                 compstart = symname;
 989
 990                 do {
 991                         symname++;
 992                 } while (*symname && *symname != '/');
 993
 994                 pc->componentType = 5;
 995                 pc->lengthComponentIdent = 0;
 996                 pc->componentFileVersionNum = 0;
 997                 if (compstart[0] == '.') {
 998                         if ((symname - compstart) == 1)
 999                                 pc->componentType = 4;
1000                         else if ((symname - compstart) == 2 &&
1001                                         compstart[1] == '.')
1002                                 pc->componentType = 3;
1003                 }
1004
1005                 if (pc->componentType == 5) {
1006                         namelen = udf_put_filename(sb, compstart,
1007                                                    symname - compstart,
1008                                                    name, UDF_NAME_LEN_CS0);
1009                         if (!namelen)
1010                                 goto out_no_entry;
1011
1012                         if (elen + sizeof(struct pathComponent) + namelen >
1013                                         eoffset)
1014                                 goto out_no_entry;
1015                         else
1016                                 pc->lengthComponentIdent = namelen;
1017
1018                         memcpy(pc->componentIdent, name, namelen);
1019                 }
1020
1021                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1022
1023                 if (*symname) {
1024                         do {
1025                                 symname++;
1026                         } while (*symname == '/');
1027                 }
1028         }
1029
1030         brelse(epos.bh);
1031         inode->i_size = elen;
1032         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1033                 iinfo->i_lenAlloc = inode->i_size;
1034         else
1035                 udf_truncate_tail_extent(inode);
1036         mark_inode_dirty(inode);
1037         up_write(&iinfo->i_data_sem);
1038
1039         err = udf_add_nondir(dentry, inode);
1040 out:
1041         kfree(name);
1042         return err;
1043
1044 out_no_entry:
1045         up_write(&iinfo->i_data_sem);
1046         inode_dec_link_count(inode);
1047         discard_new_inode(inode);
1048         goto out;
1049 }
1050
1051 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1052                     struct dentry *dentry)
1053 {
1054         struct inode *inode = d_inode(old_dentry);
1055         struct udf_fileident_bh fibh;
1056         struct fileIdentDesc cfi, *fi;
1057         int err;
1058
1059         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1060         if (!fi) {
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         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1066                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1067                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1068         }
1069         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1070         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1071                 mark_inode_dirty(dir);
1072
1073         if (fibh.sbh != fibh.ebh)
1074                 brelse(fibh.ebh);
1075         brelse(fibh.sbh);
1076         inc_nlink(inode);
1077         inode->i_ctime = current_time(inode);
1078         mark_inode_dirty(inode);
1079         dir->i_ctime = dir->i_mtime = current_time(dir);
1080         mark_inode_dirty(dir);
1081         ihold(inode);
1082         d_instantiate(dentry, inode);
1083
1084         return 0;
1085 }
1086
1087 /* Anybody can rename anything with this: the permission checks are left to the
1088  * higher-level routines.
1089  */
1090 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1091                       struct inode *new_dir, struct dentry *new_dentry,
1092                       unsigned int flags)
1093 {
1094         struct inode *old_inode = d_inode(old_dentry);
1095         struct inode *new_inode = d_inode(new_dentry);
1096         struct udf_fileident_bh ofibh, nfibh;
1097         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1098         struct fileIdentDesc ocfi, ncfi;
1099         struct buffer_head *dir_bh = NULL;
1100         int retval = -ENOENT;
1101         struct kernel_lb_addr tloc;
1102         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1103
1104         if (flags & ~RENAME_NOREPLACE)
1105                 return -EINVAL;
1106
1107         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1108         if (!ofi || IS_ERR(ofi)) {
1109                 if (IS_ERR(ofi))
1110                         retval = PTR_ERR(ofi);
1111                 goto end_rename;
1112         }
1113
1114         if (ofibh.sbh != ofibh.ebh)
1115                 brelse(ofibh.ebh);
1116
1117         brelse(ofibh.sbh);
1118         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1119         if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino)
1120                 goto end_rename;
1121
1122         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1123         if (IS_ERR(nfi)) {
1124                 retval = PTR_ERR(nfi);
1125                 goto end_rename;
1126         }
1127         if (nfi && !new_inode) {
1128                 if (nfibh.sbh != nfibh.ebh)
1129                         brelse(nfibh.ebh);
1130                 brelse(nfibh.sbh);
1131                 nfi = NULL;
1132         }
1133         if (S_ISDIR(old_inode->i_mode)) {
1134                 int offset = udf_ext0_offset(old_inode);
1135
1136                 if (new_inode) {
1137                         retval = -ENOTEMPTY;
1138                         if (!empty_dir(new_inode))
1139                                 goto end_rename;
1140                 }
1141                 retval = -EIO;
1142                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1143                         dir_fi = udf_get_fileident(
1144                                         old_iinfo->i_data -
1145                                           (old_iinfo->i_efe ?
1146                                            sizeof(struct extendedFileEntry) :
1147                                            sizeof(struct fileEntry)),
1148                                         old_inode->i_sb->s_blocksize, &offset);
1149                 } else {
1150                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1151                         if (!dir_bh)
1152                                 goto end_rename;
1153                         dir_fi = udf_get_fileident(dir_bh->b_data,
1154                                         old_inode->i_sb->s_blocksize, &offset);
1155                 }
1156                 if (!dir_fi)
1157                         goto end_rename;
1158                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1159                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1160                                 old_dir->i_ino)
1161                         goto end_rename;
1162         }
1163         if (!nfi) {
1164                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1165                                     &retval);
1166                 if (!nfi)
1167                         goto end_rename;
1168         }
1169
1170         /*
1171          * Like most other Unix systems, set the ctime for inodes on a
1172          * rename.
1173          */
1174         old_inode->i_ctime = current_time(old_inode);
1175         mark_inode_dirty(old_inode);
1176
1177         /*
1178          * ok, that's it
1179          */
1180         ncfi.fileVersionNum = ocfi.fileVersionNum;
1181         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1182         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1183         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1184
1185         /* The old fid may have moved - find it again */
1186         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1187         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1188
1189         if (new_inode) {
1190                 new_inode->i_ctime = current_time(new_inode);
1191                 inode_dec_link_count(new_inode);
1192         }
1193         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1194         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1195         mark_inode_dirty(old_dir);
1196         mark_inode_dirty(new_dir);
1197
1198         if (dir_fi) {
1199                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1200                 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1201                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1202                         mark_inode_dirty(old_inode);
1203                 else
1204                         mark_buffer_dirty_inode(dir_bh, old_inode);
1205
1206                 inode_dec_link_count(old_dir);
1207                 if (new_inode)
1208                         inode_dec_link_count(new_inode);
1209                 else {
1210                         inc_nlink(new_dir);
1211                         mark_inode_dirty(new_dir);
1212                 }
1213         }
1214
1215         if (ofi) {
1216                 if (ofibh.sbh != ofibh.ebh)
1217                         brelse(ofibh.ebh);
1218                 brelse(ofibh.sbh);
1219         }
1220
1221         retval = 0;
1222
1223 end_rename:
1224         brelse(dir_bh);
1225         if (nfi) {
1226                 if (nfibh.sbh != nfibh.ebh)
1227                         brelse(nfibh.ebh);
1228                 brelse(nfibh.sbh);
1229         }
1230
1231         return retval;
1232 }
1233
1234 static struct dentry *udf_get_parent(struct dentry *child)
1235 {
1236         struct kernel_lb_addr tloc;
1237         struct inode *inode = NULL;
1238         struct qstr dotdot = QSTR_INIT("..", 2);
1239         struct fileIdentDesc cfi;
1240         struct udf_fileident_bh fibh;
1241
1242         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1243                 return ERR_PTR(-EACCES);
1244
1245         if (fibh.sbh != fibh.ebh)
1246                 brelse(fibh.ebh);
1247         brelse(fibh.sbh);
1248
1249         tloc = lelb_to_cpu(cfi.icb.extLocation);
1250         inode = udf_iget(child->d_sb, &tloc);
1251         if (IS_ERR(inode))
1252                 return ERR_CAST(inode);
1253
1254         return d_obtain_alias(inode);
1255 }
1256
1257
1258 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1259                                         u16 partref, __u32 generation)
1260 {
1261         struct inode *inode;
1262         struct kernel_lb_addr loc;
1263
1264         if (block == 0)
1265                 return ERR_PTR(-ESTALE);
1266
1267         loc.logicalBlockNum = block;
1268         loc.partitionReferenceNum = partref;
1269         inode = udf_iget(sb, &loc);
1270
1271         if (IS_ERR(inode))
1272                 return ERR_CAST(inode);
1273
1274         if (generation && inode->i_generation != generation) {
1275                 iput(inode);
1276                 return ERR_PTR(-ESTALE);
1277         }
1278         return d_obtain_alias(inode);
1279 }
1280
1281 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1282                                        struct fid *fid, int fh_len, int fh_type)
1283 {
1284         if (fh_len < 3 ||
1285             (fh_type != FILEID_UDF_WITH_PARENT &&
1286              fh_type != FILEID_UDF_WITHOUT_PARENT))
1287                 return NULL;
1288
1289         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1290                         fid->udf.generation);
1291 }
1292
1293 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1294                                        struct fid *fid, int fh_len, int fh_type)
1295 {
1296         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1297                 return NULL;
1298
1299         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1300                                  fid->udf.parent_partref,
1301                                  fid->udf.parent_generation);
1302 }
1303 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1304                          struct inode *parent)
1305 {
1306         int len = *lenp;
1307         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1308         struct fid *fid = (struct fid *)fh;
1309         int type = FILEID_UDF_WITHOUT_PARENT;
1310
1311         if (parent && (len < 5)) {
1312                 *lenp = 5;
1313                 return FILEID_INVALID;
1314         } else if (len < 3) {
1315                 *lenp = 3;
1316                 return FILEID_INVALID;
1317         }
1318
1319         *lenp = 3;
1320         fid->udf.block = location.logicalBlockNum;
1321         fid->udf.partref = location.partitionReferenceNum;
1322         fid->udf.parent_partref = 0;
1323         fid->udf.generation = inode->i_generation;
1324
1325         if (parent) {
1326                 location = UDF_I(parent)->i_location;
1327                 fid->udf.parent_block = location.logicalBlockNum;
1328                 fid->udf.parent_partref = location.partitionReferenceNum;
1329                 fid->udf.parent_generation = inode->i_generation;
1330                 *lenp = 5;
1331                 type = FILEID_UDF_WITH_PARENT;
1332         }
1333
1334         return type;
1335 }
1336
1337 const struct export_operations udf_export_ops = {
1338         .encode_fh      = udf_encode_fh,
1339         .fh_to_dentry   = udf_fh_to_dentry,
1340         .fh_to_parent   = udf_fh_to_parent,
1341         .get_parent     = udf_get_parent,
1342 };
1343
1344 const struct inode_operations udf_dir_inode_operations = {
1345         .lookup                         = udf_lookup,
1346         .create                         = udf_create,
1347         .link                           = udf_link,
1348         .unlink                         = udf_unlink,
1349         .symlink                        = udf_symlink,
1350         .mkdir                          = udf_mkdir,
1351         .rmdir                          = udf_rmdir,
1352         .mknod                          = udf_mknod,
1353         .rename                         = udf_rename,
1354         .tmpfile                        = udf_tmpfile,
1355 };