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,
 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_ext.i_data +
 482                                          fibh->soffset -
 483                                          udf_ext0_offset(dir) +
 484                                          dinfo->i_lenEAttr);
 485                 } else {
 486                         block = eloc.logicalBlockNum +
 487                                         ((elen - 1) >>
 488                                                 dir->i_sb->s_blocksize_bits);
 489                         fi = (struct fileIdentDesc *)
 490                                 (fibh->sbh->b_data + fibh->soffset);
 491                 }
 492         } else {
 493                 /* Round up last extent in the file */
 494                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 495                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 496                         epos.offset -= sizeof(struct short_ad);
 497                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 498                         epos.offset -= sizeof(struct long_ad);
 499                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 500                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 501                                         - 1) & ~(sb->s_blocksize - 1);
 502
 503                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 504                 fibh->eoffset += nfidlen - sb->s_blocksize;
 505                 if (fibh->sbh != fibh->ebh) {
 506                         brelse(fibh->sbh);
 507                         fibh->sbh = fibh->ebh;
 508                 }
 509
 510                 block = eloc.logicalBlockNum + ((elen - 1) >>
 511                                                 dir->i_sb->s_blocksize_bits);
 512                 fibh->ebh = udf_bread(dir,
 513                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 514                 if (!fibh->ebh)
 515                         goto out_err;
 516                 /* Extents could have been merged, invalidate our position */
 517                 brelse(epos.bh);
 518                 epos.bh = NULL;
 519                 epos.block = dinfo->i_location;
 520                 epos.offset = udf_file_entry_alloc_offset(dir);
 521
 522                 if (!fibh->soffset) {
 523                         /* Find the freshly allocated block */
 524                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 525                                 (EXT_RECORDED_ALLOCATED >> 30))
 526                                 ;
 527                         block = eloc.logicalBlockNum + ((elen - 1) >>
 528                                         dir->i_sb->s_blocksize_bits);
 529                         brelse(fibh->sbh);
 530                         fibh->sbh = fibh->ebh;
 531                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 532                 } else {
 533                         fi = (struct fileIdentDesc *)
 534                                 (fibh->sbh->b_data + sb->s_blocksize +
 535                                         fibh->soffset);
 536                 }
 537         }
 538
 539         memset(cfi, 0, sizeof(struct fileIdentDesc));
 540         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 541                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 542                             sizeof(struct tag));
 543         else
 544                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 545                             sizeof(struct tag));
 546         cfi->fileVersionNum = cpu_to_le16(1);
 547         cfi->lengthFileIdent = namelen;
 548         cfi->lengthOfImpUse = cpu_to_le16(0);
 549         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 550                 dir->i_size += nfidlen;
 551                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 552                         dinfo->i_lenAlloc += nfidlen;
 553                 else {
 554                         /* Find the last extent and truncate it to proper size */
 555                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 556                                 (EXT_RECORDED_ALLOCATED >> 30))
 557                                 ;
 558                         elen -= dinfo->i_lenExtents - dir->i_size;
 559                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 560                                 epos.offset -= sizeof(struct short_ad);
 561                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 562                                 epos.offset -= sizeof(struct long_ad);
 563                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 564                         dinfo->i_lenExtents = dir->i_size;
 565                 }
 566
 567                 mark_inode_dirty(dir);
 568                 goto out_ok;
 569         } else {
 570                 *err = -EIO;
 571                 goto out_err;
 572         }
 573
 574 out_err:
 575         fi = NULL;
 576         if (fibh->sbh != fibh->ebh)
 577                 brelse(fibh->ebh);
 578         brelse(fibh->sbh);
 579 out_ok:
 580         brelse(epos.bh);
 581         kfree(name);
 582         return fi;
 583 }
 584
 585 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 586                             struct udf_fileident_bh *fibh,
 587                             struct fileIdentDesc *cfi)
 588 {
 589         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 590
 591         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 592                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 593
 594         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 595 }
 596
 597 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 598 {
 599         struct udf_inode_info *iinfo = UDF_I(inode);
 600         struct inode *dir = d_inode(dentry->d_parent);
 601         struct udf_fileident_bh fibh;
 602         struct fileIdentDesc cfi, *fi;
 603         int err;
 604
 605         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 606         if (unlikely(!fi)) {
 607                 inode_dec_link_count(inode);
 608                 discard_new_inode(inode);
 609                 return err;
 610         }
 611         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 612         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 613         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 614                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 615         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 616         dir->i_ctime = dir->i_mtime = current_time(dir);
 617         mark_inode_dirty(dir);
 618         if (fibh.sbh != fibh.ebh)
 619                 brelse(fibh.ebh);
 620         brelse(fibh.sbh);
 621         d_instantiate_new(dentry, inode);
 622
 623         return 0;
 624 }
 625
 626 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 627                       bool excl)
 628 {
 629         struct inode *inode = udf_new_inode(dir, mode);
 630
 631         if (IS_ERR(inode))
 632                 return PTR_ERR(inode);
 633
 634         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 635                 inode->i_data.a_ops = &udf_adinicb_aops;
 636         else
 637                 inode->i_data.a_ops = &udf_aops;
 638         inode->i_op = &udf_file_inode_operations;
 639         inode->i_fop = &udf_file_operations;
 640         mark_inode_dirty(inode);
 641
 642         return udf_add_nondir(dentry, inode);
 643 }
 644
 645 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 646 {
 647         struct inode *inode = udf_new_inode(dir, mode);
 648
 649         if (IS_ERR(inode))
 650                 return PTR_ERR(inode);
 651
 652         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 653                 inode->i_data.a_ops = &udf_adinicb_aops;
 654         else
 655                 inode->i_data.a_ops = &udf_aops;
 656         inode->i_op = &udf_file_inode_operations;
 657         inode->i_fop = &udf_file_operations;
 658         mark_inode_dirty(inode);
 659         d_tmpfile(dentry, inode);
 660         unlock_new_inode(inode);
 661         return 0;
 662 }
 663
 664 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 665                      dev_t rdev)
 666 {
 667         struct inode *inode;
 668
 669         if (!old_valid_dev(rdev))
 670                 return -EINVAL;
 671
 672         inode = udf_new_inode(dir, mode);
 673         if (IS_ERR(inode))
 674                 return PTR_ERR(inode);
 675
 676         init_special_inode(inode, mode, rdev);
 677         return udf_add_nondir(dentry, inode);
 678 }
 679
 680 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 681 {
 682         struct inode *inode;
 683         struct udf_fileident_bh fibh;
 684         struct fileIdentDesc cfi, *fi;
 685         int err;
 686         struct udf_inode_info *dinfo = UDF_I(dir);
 687         struct udf_inode_info *iinfo;
 688
 689         inode = udf_new_inode(dir, S_IFDIR | mode);
 690         if (IS_ERR(inode))
 691                 return PTR_ERR(inode);
 692
 693         iinfo = UDF_I(inode);
 694         inode->i_op = &udf_dir_inode_operations;
 695         inode->i_fop = &udf_dir_operations;
 696         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 697         if (!fi) {
 698                 inode_dec_link_count(inode);
 699                 discard_new_inode(inode);
 700                 goto out;
 701         }
 702         set_nlink(inode, 2);
 703         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 704         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 705         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 706                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 707         cfi.fileCharacteristics =
 708                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 709         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 710         brelse(fibh.sbh);
 711         mark_inode_dirty(inode);
 712
 713         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 714         if (!fi) {
 715                 clear_nlink(inode);
 716                 mark_inode_dirty(inode);
 717                 discard_new_inode(inode);
 718                 goto out;
 719         }
 720         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 721         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 722         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 723                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 724         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 725         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 726         inc_nlink(dir);
 727         dir->i_ctime = dir->i_mtime = current_time(dir);
 728         mark_inode_dirty(dir);
 729         d_instantiate_new(dentry, inode);
 730         if (fibh.sbh != fibh.ebh)
 731                 brelse(fibh.ebh);
 732         brelse(fibh.sbh);
 733         err = 0;
 734
 735 out:
 736         return err;
 737 }
 738
 739 static int empty_dir(struct inode *dir)
 740 {
 741         struct fileIdentDesc *fi, cfi;
 742         struct udf_fileident_bh fibh;
 743         loff_t f_pos;
 744         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 745         udf_pblk_t block;
 746         struct kernel_lb_addr eloc;
 747         uint32_t elen;
 748         sector_t offset;
 749         struct extent_position epos = {};
 750         struct udf_inode_info *dinfo = UDF_I(dir);
 751
 752         f_pos = udf_ext0_offset(dir);
 753         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 754
 755         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 756                 fibh.sbh = fibh.ebh = NULL;
 757         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 758                               &epos, &eloc, &elen, &offset) ==
 759                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 760                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 761                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 762                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 763                                 epos.offset -= sizeof(struct short_ad);
 764                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 765                                 epos.offset -= sizeof(struct long_ad);
 766                 } else
 767                         offset = 0;
 768
 769                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 770                 if (!fibh.sbh) {
 771                         brelse(epos.bh);
 772                         return 0;
 773                 }
 774         } else {
 775                 brelse(epos.bh);
 776                 return 0;
 777         }
 778
 779         while (f_pos < size) {
 780                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 781                                         &elen, &offset);
 782                 if (!fi) {
 783                         if (fibh.sbh != fibh.ebh)
 784                                 brelse(fibh.ebh);
 785                         brelse(fibh.sbh);
 786                         brelse(epos.bh);
 787                         return 0;
 788                 }
 789
 790                 if (cfi.lengthFileIdent &&
 791                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 792                         if (fibh.sbh != fibh.ebh)
 793                                 brelse(fibh.ebh);
 794                         brelse(fibh.sbh);
 795                         brelse(epos.bh);
 796                         return 0;
 797                 }
 798         }
 799
 800         if (fibh.sbh != fibh.ebh)
 801                 brelse(fibh.ebh);
 802         brelse(fibh.sbh);
 803         brelse(epos.bh);
 804
 805         return 1;
 806 }
 807
 808 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 809 {
 810         int retval;
 811         struct inode *inode = d_inode(dentry);
 812         struct udf_fileident_bh fibh;
 813         struct fileIdentDesc *fi, cfi;
 814         struct kernel_lb_addr tloc;
 815
 816         retval = -ENOENT;
 817         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 818         if (IS_ERR_OR_NULL(fi)) {
 819                 if (fi)
 820                         retval = PTR_ERR(fi);
 821                 goto out;
 822         }
 823
 824         retval = -EIO;
 825         tloc = lelb_to_cpu(cfi.icb.extLocation);
 826         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 827                 goto end_rmdir;
 828         retval = -ENOTEMPTY;
 829         if (!empty_dir(inode))
 830                 goto end_rmdir;
 831         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 832         if (retval)
 833                 goto end_rmdir;
 834         if (inode->i_nlink != 2)
 835                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 836                          inode->i_nlink);
 837         clear_nlink(inode);
 838         inode->i_size = 0;
 839         inode_dec_link_count(dir);
 840         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 841                                                 current_time(inode);
 842         mark_inode_dirty(dir);
 843
 844 end_rmdir:
 845         if (fibh.sbh != fibh.ebh)
 846                 brelse(fibh.ebh);
 847         brelse(fibh.sbh);
 848
 849 out:
 850         return retval;
 851 }
 852
 853 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 854 {
 855         int retval;
 856         struct inode *inode = d_inode(dentry);
 857         struct udf_fileident_bh fibh;
 858         struct fileIdentDesc *fi;
 859         struct fileIdentDesc cfi;
 860         struct kernel_lb_addr tloc;
 861
 862         retval = -ENOENT;
 863         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 864
 865         if (IS_ERR_OR_NULL(fi)) {
 866                 if (fi)
 867                         retval = PTR_ERR(fi);
 868                 goto out;
 869         }
 870
 871         retval = -EIO;
 872         tloc = lelb_to_cpu(cfi.icb.extLocation);
 873         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 874                 goto end_unlink;
 875
 876         if (!inode->i_nlink) {
 877                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 878                           inode->i_ino, inode->i_nlink);
 879                 set_nlink(inode, 1);
 880         }
 881         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 882         if (retval)
 883                 goto end_unlink;
 884         dir->i_ctime = dir->i_mtime = current_time(dir);
 885         mark_inode_dirty(dir);
 886         inode_dec_link_count(inode);
 887         inode->i_ctime = dir->i_ctime;
 888         retval = 0;
 889
 890 end_unlink:
 891         if (fibh.sbh != fibh.ebh)
 892                 brelse(fibh.ebh);
 893         brelse(fibh.sbh);
 894
 895 out:
 896         return retval;
 897 }
 898
 899 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 900                        const char *symname)
 901 {
 902         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 903         struct pathComponent *pc;
 904         const char *compstart;
 905         struct extent_position epos = {};
 906         int eoffset, elen = 0;
 907         uint8_t *ea;
 908         int err;
 909         udf_pblk_t block;
 910         unsigned char *name = NULL;
 911         int namelen;
 912         struct udf_inode_info *iinfo;
 913         struct super_block *sb = dir->i_sb;
 914
 915         if (IS_ERR(inode))
 916                 return PTR_ERR(inode);
 917
 918         iinfo = UDF_I(inode);
 919         down_write(&iinfo->i_data_sem);
 920         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 921         if (!name) {
 922                 err = -ENOMEM;
 923                 goto out_no_entry;
 924         }
 925
 926         inode->i_data.a_ops = &udf_symlink_aops;
 927         inode->i_op = &udf_symlink_inode_operations;
 928         inode_nohighmem(inode);
 929
 930         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 931                 struct kernel_lb_addr eloc;
 932                 uint32_t bsize;
 933
 934                 block = udf_new_block(sb, inode,
 935                                 iinfo->i_location.partitionReferenceNum,
 936                                 iinfo->i_location.logicalBlockNum, &err);
 937                 if (!block)
 938                         goto out_no_entry;
 939                 epos.block = iinfo->i_location;
 940                 epos.offset = udf_file_entry_alloc_offset(inode);
 941                 epos.bh = NULL;
 942                 eloc.logicalBlockNum = block;
 943                 eloc.partitionReferenceNum =
 944                                 iinfo->i_location.partitionReferenceNum;
 945                 bsize = sb->s_blocksize;
 946                 iinfo->i_lenExtents = bsize;
 947                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 948                 brelse(epos.bh);
 949
 950                 block = udf_get_pblock(sb, block,
 951                                 iinfo->i_location.partitionReferenceNum,
 952                                 0);
 953                 epos.bh = udf_tgetblk(sb, block);
 954                 if (unlikely(!epos.bh)) {
 955                         err = -ENOMEM;
 956                         goto out_no_entry;
 957                 }
 958                 lock_buffer(epos.bh);
 959                 memset(epos.bh->b_data, 0x00, bsize);
 960                 set_buffer_uptodate(epos.bh);
 961                 unlock_buffer(epos.bh);
 962                 mark_buffer_dirty_inode(epos.bh, inode);
 963                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 964         } else
 965                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 966
 967         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 968         pc = (struct pathComponent *)ea;
 969
 970         if (*symname == '/') {
 971                 do {
 972                         symname++;
 973                 } while (*symname == '/');
 974
 975                 pc->componentType = 1;
 976                 pc->lengthComponentIdent = 0;
 977                 pc->componentFileVersionNum = 0;
 978                 elen += sizeof(struct pathComponent);
 979         }
 980
 981         err = -ENAMETOOLONG;
 982
 983         while (*symname) {
 984                 if (elen + sizeof(struct pathComponent) > eoffset)
 985                         goto out_no_entry;
 986
 987                 pc = (struct pathComponent *)(ea + elen);
 988
 989                 compstart = symname;
 990
 991                 do {
 992                         symname++;
 993                 } while (*symname && *symname != '/');
 994
 995                 pc->componentType = 5;
 996                 pc->lengthComponentIdent = 0;
 997                 pc->componentFileVersionNum = 0;
 998                 if (compstart[0] == '.') {
 999                         if ((symname - compstart) == 1)
1000                                 pc->componentType = 4;
1001                         else if ((symname - compstart) == 2 &&
1002                                         compstart[1] == '.')
1003                                 pc->componentType = 3;
1004                 }
1005
1006                 if (pc->componentType == 5) {
1007                         namelen = udf_put_filename(sb, compstart,
1008                                                    symname - compstart,
1009                                                    name, UDF_NAME_LEN_CS0);
1010                         if (!namelen)
1011                                 goto out_no_entry;
1012
1013                         if (elen + sizeof(struct pathComponent) + namelen >
1014                                         eoffset)
1015                                 goto out_no_entry;
1016                         else
1017                                 pc->lengthComponentIdent = namelen;
1018
1019                         memcpy(pc->componentIdent, name, namelen);
1020                 }
1021
1022                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1023
1024                 if (*symname) {
1025                         do {
1026                                 symname++;
1027                         } while (*symname == '/');
1028                 }
1029         }
1030
1031         brelse(epos.bh);
1032         inode->i_size = elen;
1033         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1034                 iinfo->i_lenAlloc = inode->i_size;
1035         else
1036                 udf_truncate_tail_extent(inode);
1037         mark_inode_dirty(inode);
1038         up_write(&iinfo->i_data_sem);
1039
1040         err = udf_add_nondir(dentry, inode);
1041 out:
1042         kfree(name);
1043         return err;
1044
1045 out_no_entry:
1046         up_write(&iinfo->i_data_sem);
1047         inode_dec_link_count(inode);
1048         discard_new_inode(inode);
1049         goto out;
1050 }
1051
1052 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1053                     struct dentry *dentry)
1054 {
1055         struct inode *inode = d_inode(old_dentry);
1056         struct udf_fileident_bh fibh;
1057         struct fileIdentDesc cfi, *fi;
1058         int err;
1059
1060         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1061         if (!fi) {
1062                 return err;
1063         }
1064         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1065         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1066         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1067                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1068                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1069         }
1070         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1071         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1072                 mark_inode_dirty(dir);
1073
1074         if (fibh.sbh != fibh.ebh)
1075                 brelse(fibh.ebh);
1076         brelse(fibh.sbh);
1077         inc_nlink(inode);
1078         inode->i_ctime = current_time(inode);
1079         mark_inode_dirty(inode);
1080         dir->i_ctime = dir->i_mtime = current_time(dir);
1081         mark_inode_dirty(dir);
1082         ihold(inode);
1083         d_instantiate(dentry, inode);
1084
1085         return 0;
1086 }
1087
1088 /* Anybody can rename anything with this: the permission checks are left to the
1089  * higher-level routines.
1090  */
1091 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1092                       struct inode *new_dir, struct dentry *new_dentry,
1093                       unsigned int flags)
1094 {
1095         struct inode *old_inode = d_inode(old_dentry);
1096         struct inode *new_inode = d_inode(new_dentry);
1097         struct udf_fileident_bh ofibh, nfibh;
1098         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1099         struct fileIdentDesc ocfi, ncfi;
1100         struct buffer_head *dir_bh = NULL;
1101         int retval = -ENOENT;
1102         struct kernel_lb_addr tloc;
1103         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1104
1105         if (flags & ~RENAME_NOREPLACE)
1106                 return -EINVAL;
1107
1108         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
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 (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1120             != old_inode->i_ino)
1121                 goto end_rename;
1122
1123         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1124         if (IS_ERR(nfi)) {
1125                 retval = PTR_ERR(nfi);
1126                 goto end_rename;
1127         }
1128         if (nfi && !new_inode) {
1129                 if (nfibh.sbh != nfibh.ebh)
1130                         brelse(nfibh.ebh);
1131                 brelse(nfibh.sbh);
1132                 nfi = NULL;
1133         }
1134         if (S_ISDIR(old_inode->i_mode)) {
1135                 int offset = udf_ext0_offset(old_inode);
1136
1137                 if (new_inode) {
1138                         retval = -ENOTEMPTY;
1139                         if (!empty_dir(new_inode))
1140                                 goto end_rename;
1141                 }
1142                 retval = -EIO;
1143                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1144                         dir_fi = udf_get_fileident(
1145                                         old_iinfo->i_ext.i_data -
1146                                           (old_iinfo->i_efe ?
1147                                            sizeof(struct extendedFileEntry) :
1148                                            sizeof(struct fileEntry)),
1149                                         old_inode->i_sb->s_blocksize, &offset);
1150                 } else {
1151                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1152                         if (!dir_bh)
1153                                 goto end_rename;
1154                         dir_fi = udf_get_fileident(dir_bh->b_data,
1155                                         old_inode->i_sb->s_blocksize, &offset);
1156                 }
1157                 if (!dir_fi)
1158                         goto end_rename;
1159                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1160                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1161                                 old_dir->i_ino)
1162                         goto end_rename;
1163         }
1164         if (!nfi) {
1165                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1166                                     &retval);
1167                 if (!nfi)
1168                         goto end_rename;
1169         }
1170
1171         /*
1172          * Like most other Unix systems, set the ctime for inodes on a
1173          * rename.
1174          */
1175         old_inode->i_ctime = current_time(old_inode);
1176         mark_inode_dirty(old_inode);
1177
1178         /*
1179          * ok, that's it
1180          */
1181         ncfi.fileVersionNum = ocfi.fileVersionNum;
1182         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1183         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1184         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1185
1186         /* The old fid may have moved - find it again */
1187         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1188         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1189
1190         if (new_inode) {
1191                 new_inode->i_ctime = current_time(new_inode);
1192                 inode_dec_link_count(new_inode);
1193         }
1194         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1195         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1196         mark_inode_dirty(old_dir);
1197         mark_inode_dirty(new_dir);
1198
1199         if (dir_fi) {
1200                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1201                 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1202                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1203                         mark_inode_dirty(old_inode);
1204                 else
1205                         mark_buffer_dirty_inode(dir_bh, old_inode);
1206
1207                 inode_dec_link_count(old_dir);
1208                 if (new_inode)
1209                         inode_dec_link_count(new_inode);
1210                 else {
1211                         inc_nlink(new_dir);
1212                         mark_inode_dirty(new_dir);
1213                 }
1214         }
1215
1216         if (ofi) {
1217                 if (ofibh.sbh != ofibh.ebh)
1218                         brelse(ofibh.ebh);
1219                 brelse(ofibh.sbh);
1220         }
1221
1222         retval = 0;
1223
1224 end_rename:
1225         brelse(dir_bh);
1226         if (nfi) {
1227                 if (nfibh.sbh != nfibh.ebh)
1228                         brelse(nfibh.ebh);
1229                 brelse(nfibh.sbh);
1230         }
1231
1232         return retval;
1233 }
1234
1235 static struct dentry *udf_get_parent(struct dentry *child)
1236 {
1237         struct kernel_lb_addr tloc;
1238         struct inode *inode = NULL;
1239         struct qstr dotdot = QSTR_INIT("..", 2);
1240         struct fileIdentDesc cfi;
1241         struct udf_fileident_bh fibh;
1242
1243         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1244                 return ERR_PTR(-EACCES);
1245
1246         if (fibh.sbh != fibh.ebh)
1247                 brelse(fibh.ebh);
1248         brelse(fibh.sbh);
1249
1250         tloc = lelb_to_cpu(cfi.icb.extLocation);
1251         inode = udf_iget(child->d_sb, &tloc);
1252         if (IS_ERR(inode))
1253                 return ERR_CAST(inode);
1254
1255         return d_obtain_alias(inode);
1256 }
1257
1258
1259 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1260                                         u16 partref, __u32 generation)
1261 {
1262         struct inode *inode;
1263         struct kernel_lb_addr loc;
1264
1265         if (block == 0)
1266                 return ERR_PTR(-ESTALE);
1267
1268         loc.logicalBlockNum = block;
1269         loc.partitionReferenceNum = partref;
1270         inode = udf_iget(sb, &loc);
1271
1272         if (IS_ERR(inode))
1273                 return ERR_CAST(inode);
1274
1275         if (generation && inode->i_generation != generation) {
1276                 iput(inode);
1277                 return ERR_PTR(-ESTALE);
1278         }
1279         return d_obtain_alias(inode);
1280 }
1281
1282 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1283                                        struct fid *fid, int fh_len, int fh_type)
1284 {
1285         if (fh_len < 3 ||
1286             (fh_type != FILEID_UDF_WITH_PARENT &&
1287              fh_type != FILEID_UDF_WITHOUT_PARENT))
1288                 return NULL;
1289
1290         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1291                         fid->udf.generation);
1292 }
1293
1294 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1295                                        struct fid *fid, int fh_len, int fh_type)
1296 {
1297         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1298                 return NULL;
1299
1300         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1301                                  fid->udf.parent_partref,
1302                                  fid->udf.parent_generation);
1303 }
1304 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1305                          struct inode *parent)
1306 {
1307         int len = *lenp;
1308         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1309         struct fid *fid = (struct fid *)fh;
1310         int type = FILEID_UDF_WITHOUT_PARENT;
1311
1312         if (parent && (len < 5)) {
1313                 *lenp = 5;
1314                 return FILEID_INVALID;
1315         } else if (len < 3) {
1316                 *lenp = 3;
1317                 return FILEID_INVALID;
1318         }
1319
1320         *lenp = 3;
1321         fid->udf.block = location.logicalBlockNum;
1322         fid->udf.partref = location.partitionReferenceNum;
1323         fid->udf.parent_partref = 0;
1324         fid->udf.generation = inode->i_generation;
1325
1326         if (parent) {
1327                 location = UDF_I(parent)->i_location;
1328                 fid->udf.parent_block = location.logicalBlockNum;
1329                 fid->udf.parent_partref = location.partitionReferenceNum;
1330                 fid->udf.parent_generation = inode->i_generation;
1331                 *lenp = 5;
1332                 type = FILEID_UDF_WITH_PARENT;
1333         }
1334
1335         return type;
1336 }
1337
1338 const struct export_operations udf_export_ops = {
1339         .encode_fh      = udf_encode_fh,
1340         .fh_to_dentry   = udf_fh_to_dentry,
1341         .fh_to_parent   = udf_fh_to_parent,
1342         .get_parent     = udf_get_parent,
1343 };
1344
1345 const struct inode_operations udf_dir_inode_operations = {
1346         .lookup                         = udf_lookup,
1347         .create                         = udf_create,
1348         .link                           = udf_link,
1349         .unlink                         = udf_unlink,
1350         .symlink                        = udf_symlink,
1351         .mkdir                          = udf_mkdir,
1352         .rmdir                          = udf_rmdir,
1353         .mknod                          = udf_mknod,
1354         .rename                         = udf_rename,
1355         .tmpfile                        = udf_tmpfile,
1356 };