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
  34 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  35                             const unsigned char *name2)
  36 {
  37         if (len1 != len2)
  38                 return 0;
  39
  40         return !memcmp(name1, name2, len1);
  41 }
  42
  43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  44                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  45                  uint8_t *impuse, uint8_t *fileident)
  46 {
  47         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  48         uint16_t crc;
  49         int offset;
  50         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  51         uint8_t lfi = cfi->lengthFileIdent;
  52         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  53                 sizeof(struct fileIdentDesc);
  54         int adinicb = 0;
  55
  56         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  57                 adinicb = 1;
  58
  59         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  60
  61         if (impuse) {
  62                 if (adinicb || (offset + liu < 0)) {
  63                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  64                 } else if (offset >= 0) {
  65                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  66                 } else {
  67                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  68                         memcpy(fibh->ebh->b_data, impuse - offset,
  69                                 liu + offset);
  70                 }
  71         }
  72
  73         offset += liu;
  74
  75         if (fileident) {
  76                 if (adinicb || (offset + lfi < 0)) {
  77                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  78                 } else if (offset >= 0) {
  79                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  80                 } else {
  81                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  82                                 -offset);
  83                         memcpy(fibh->ebh->b_data, fileident - offset,
  84                                 lfi + offset);
  85                 }
  86         }
  87
  88         offset += lfi;
  89
  90         if (adinicb || (offset + padlen < 0)) {
  91                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  92         } else if (offset >= 0) {
  93                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  94         } else {
  95                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  96                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  97         }
  98
  99         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
 100                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 101
 102         if (fibh->sbh == fibh->ebh) {
 103                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 104                               crclen + sizeof(struct tag) -
 105                               sizeof(struct fileIdentDesc));
 106         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 107                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 108                                         sizeof(struct fileIdentDesc) +
 109                                         fibh->soffset,
 110                               crclen + sizeof(struct tag) -
 111                                         sizeof(struct fileIdentDesc));
 112         } else {
 113                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 114                               -fibh->soffset - sizeof(struct fileIdentDesc));
 115                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 116         }
 117
 118         cfi->descTag.descCRC = cpu_to_le16(crc);
 119         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 120         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 121
 122         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 123                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 124                         sizeof(struct fileIdentDesc));
 125         } else {
 126                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 127                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 128                        sizeof(struct fileIdentDesc) + fibh->soffset);
 129         }
 130
 131         if (adinicb) {
 132                 mark_inode_dirty(inode);
 133         } else {
 134                 if (fibh->sbh != fibh->ebh)
 135                         mark_buffer_dirty_inode(fibh->ebh, inode);
 136                 mark_buffer_dirty_inode(fibh->sbh, inode);
 137         }
 138         return 0;
 139 }
 140
 141 /**
 142  * udf_find_entry - find entry in given directory.
 143  *
 144  * @dir:        directory inode to search in
 145  * @child:      qstr of the name
 146  * @fibh:       buffer head / inode with file identifier descriptor we found
 147  * @cfi:        found file identifier descriptor with given name
 148  *
 149  * This function searches in the directory @dir for a file name @child. When
 150  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 151  * directories) containing the file identifier descriptor (FID). In that case
 152  * the function returns pointer to the FID in the buffer or inode - but note
 153  * that FID may be split among two buffers (blocks) so accessing it via that
 154  * pointer isn't easily possible. This pointer can be used only as an iterator
 155  * for other directory manipulation functions. For inspection of the FID @cfi
 156  * can be used - the found FID is copied there.
 157  *
 158  * Returns pointer to FID, NULL when nothing found, or error code.
 159  */
 160 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 161                                             const struct qstr *child,
 162                                             struct udf_fileident_bh *fibh,
 163                                             struct fileIdentDesc *cfi)
 164 {
 165         struct fileIdentDesc *fi = NULL;
 166         loff_t f_pos;
 167         udf_pblk_t block;
 168         int flen;
 169         unsigned char *fname = NULL, *copy_name = NULL;
 170         unsigned char *nameptr;
 171         uint8_t lfi;
 172         uint16_t liu;
 173         loff_t size;
 174         struct kernel_lb_addr eloc;
 175         uint32_t elen;
 176         sector_t offset;
 177         struct extent_position epos = {};
 178         struct udf_inode_info *dinfo = UDF_I(dir);
 179         int isdotdot = child->len == 2 &&
 180                 child->name[0] == '.' && child->name[1] == '.';
 181         struct super_block *sb = dir->i_sb;
 182
 183         size = udf_ext0_offset(dir) + dir->i_size;
 184         f_pos = udf_ext0_offset(dir);
 185
 186         fibh->sbh = fibh->ebh = NULL;
 187         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 188         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 189                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 190                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 191                         fi = ERR_PTR(-EIO);
 192                         goto out_err;
 193                 }
 194
 195                 block = udf_get_lb_pblock(sb, &eloc, offset);
 196                 if ((++offset << sb->s_blocksize_bits) < elen) {
 197                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 198                                 epos.offset -= sizeof(struct short_ad);
 199                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 200                                 epos.offset -= sizeof(struct long_ad);
 201                 } else
 202                         offset = 0;
 203
 204                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 205                 if (!fibh->sbh) {
 206                         fi = ERR_PTR(-EIO);
 207                         goto out_err;
 208                 }
 209         }
 210
 211         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 212         if (!fname) {
 213                 fi = ERR_PTR(-ENOMEM);
 214                 goto out_err;
 215         }
 216
 217         while (f_pos < size) {
 218                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 219                                         &elen, &offset);
 220                 if (!fi) {
 221                         fi = ERR_PTR(-EIO);
 222                         goto out_err;
 223                 }
 224
 225                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 226                 lfi = cfi->lengthFileIdent;
 227
 228                 if (fibh->sbh == fibh->ebh) {
 229                         nameptr = fi->fileIdent + liu;
 230                 } else {
 231                         int poffset;    /* Unpaded ending offset */
 232
 233                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 234                                         liu + lfi;
 235
 236                         if (poffset >= lfi)
 237                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 238                                                       poffset - lfi);
 239                         else {
 240                                 if (!copy_name) {
 241                                         copy_name = kmalloc(UDF_NAME_LEN,
 242                                                             GFP_NOFS);
 243                                         if (!copy_name) {
 244                                                 fi = ERR_PTR(-ENOMEM);
 245                                                 goto out_err;
 246                                         }
 247                                 }
 248                                 nameptr = copy_name;
 249                                 memcpy(nameptr, fi->fileIdent + liu,
 250                                         lfi - poffset);
 251                                 memcpy(nameptr + lfi - poffset,
 252                                         fibh->ebh->b_data, poffset);
 253                         }
 254                 }
 255
 256                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 257                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 258                                 continue;
 259                 }
 260
 261                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 262                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                                 continue;
 264                 }
 265
 266                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 267                     isdotdot)
 268                         goto out_ok;
 269
 270                 if (!lfi)
 271                         continue;
 272
 273                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 274                 if (flen < 0) {
 275                         fi = ERR_PTR(flen);
 276                         goto out_err;
 277                 }
 278
 279                 if (udf_match(flen, fname, child->len, child->name))
 280                         goto out_ok;
 281         }
 282
 283         fi = NULL;
 284 out_err:
 285         if (fibh->sbh != fibh->ebh)
 286                 brelse(fibh->ebh);
 287         brelse(fibh->sbh);
 288 out_ok:
 289         brelse(epos.bh);
 290         kfree(fname);
 291         kfree(copy_name);
 292
 293         return fi;
 294 }
 295
 296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 297                                  unsigned int flags)
 298 {
 299         struct inode *inode = NULL;
 300         struct fileIdentDesc cfi;
 301         struct udf_fileident_bh fibh;
 302         struct fileIdentDesc *fi;
 303
 304         if (dentry->d_name.len > UDF_NAME_LEN)
 305                 return ERR_PTR(-ENAMETOOLONG);
 306
 307 #ifdef UDF_RECOVERY
 308         /* temporary shorthand for specifying files by inode number */
 309         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 310                 struct kernel_lb_addr lb = {
 311                         .logicalBlockNum = 0,
 312                         .partitionReferenceNum =
 313                                 simple_strtoul(dentry->d_name.name + 3,
 314                                                 NULL, 0),
 315                 };
 316                 inode = udf_iget(dir->i_sb, lb);
 317                 if (IS_ERR(inode))
 318                         return inode;
 319         } else
 320 #endif /* UDF_RECOVERY */
 321
 322         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 323         if (IS_ERR(fi))
 324                 return ERR_CAST(fi);
 325
 326         if (fi) {
 327                 struct kernel_lb_addr loc;
 328
 329                 if (fibh.sbh != fibh.ebh)
 330                         brelse(fibh.ebh);
 331                 brelse(fibh.sbh);
 332
 333                 loc = lelb_to_cpu(cfi.icb.extLocation);
 334                 inode = udf_iget(dir->i_sb, &loc);
 335                 if (IS_ERR(inode))
 336                         return ERR_CAST(inode);
 337         }
 338
 339         return d_splice_alias(inode, dentry);
 340 }
 341
 342 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 343                                            struct dentry *dentry,
 344                                            struct udf_fileident_bh *fibh,
 345                                            struct fileIdentDesc *cfi, int *err)
 346 {
 347         struct super_block *sb = dir->i_sb;
 348         struct fileIdentDesc *fi = NULL;
 349         unsigned char *name = NULL;
 350         int namelen;
 351         loff_t f_pos;
 352         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 353         int nfidlen;
 354         uint8_t lfi;
 355         uint16_t liu;
 356         udf_pblk_t block;
 357         struct kernel_lb_addr eloc;
 358         uint32_t elen = 0;
 359         sector_t offset;
 360         struct extent_position epos = {};
 361         struct udf_inode_info *dinfo;
 362
 363         fibh->sbh = fibh->ebh = NULL;
 364         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 365         if (!name) {
 366                 *err = -ENOMEM;
 367                 goto out_err;
 368         }
 369
 370         if (dentry) {
 371                 if (!dentry->d_name.len) {
 372                         *err = -EINVAL;
 373                         goto out_err;
 374                 }
 375                 namelen = udf_put_filename(sb, dentry->d_name.name,
 376                                            dentry->d_name.len,
 377                                            name, UDF_NAME_LEN_CS0);
 378                 if (!namelen) {
 379                         *err = -ENAMETOOLONG;
 380                         goto out_err;
 381                 }
 382         } else {
 383                 namelen = 0;
 384         }
 385
 386         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 387
 388         f_pos = udf_ext0_offset(dir);
 389
 390         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 391         dinfo = UDF_I(dir);
 392         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 393                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 394                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 395                         block = udf_get_lb_pblock(dir->i_sb,
 396                                         &dinfo->i_location, 0);
 397                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 398                         goto add;
 399                 }
 400                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 401                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 402                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 403                                 epos.offset -= sizeof(struct short_ad);
 404                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 405                                 epos.offset -= sizeof(struct long_ad);
 406                 } else
 407                         offset = 0;
 408
 409                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 410                 if (!fibh->sbh) {
 411                         *err = -EIO;
 412                         goto out_err;
 413                 }
 414
 415                 block = dinfo->i_location.logicalBlockNum;
 416         }
 417
 418         while (f_pos < size) {
 419                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 420                                         &elen, &offset);
 421
 422                 if (!fi) {
 423                         *err = -EIO;
 424                         goto out_err;
 425                 }
 426
 427                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 428                 lfi = cfi->lengthFileIdent;
 429
 430                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 431                         if (((sizeof(struct fileIdentDesc) +
 432                                         liu + lfi + 3) & ~3) == nfidlen) {
 433                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 434                                 cfi->fileVersionNum = cpu_to_le16(1);
 435                                 cfi->fileCharacteristics = 0;
 436                                 cfi->lengthFileIdent = namelen;
 437                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 438                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 439                                                   name))
 440                                         goto out_ok;
 441                                 else {
 442                                         *err = -EIO;
 443                                         goto out_err;
 444                                 }
 445                         }
 446                 }
 447         }
 448
 449 add:
 450         f_pos += nfidlen;
 451
 452         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 453             sb->s_blocksize - fibh->eoffset < nfidlen) {
 454                 brelse(epos.bh);
 455                 epos.bh = NULL;
 456                 fibh->soffset -= udf_ext0_offset(dir);
 457                 fibh->eoffset -= udf_ext0_offset(dir);
 458                 f_pos -= udf_ext0_offset(dir);
 459                 if (fibh->sbh != fibh->ebh)
 460                         brelse(fibh->ebh);
 461                 brelse(fibh->sbh);
 462                 fibh->sbh = fibh->ebh =
 463                                 udf_expand_dir_adinicb(dir, &block, err);
 464                 if (!fibh->sbh)
 465                         goto out_err;
 466                 epos.block = dinfo->i_location;
 467                 epos.offset = udf_file_entry_alloc_offset(dir);
 468                 /* Load extent udf_expand_dir_adinicb() has created */
 469                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 470         }
 471
 472         /* Entry fits into current block? */
 473         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 474                 fibh->soffset = fibh->eoffset;
 475                 fibh->eoffset += nfidlen;
 476                 if (fibh->sbh != fibh->ebh) {
 477                         brelse(fibh->sbh);
 478                         fibh->sbh = fibh->ebh;
 479                 }
 480
 481                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 482                         block = dinfo->i_location.logicalBlockNum;
 483                         fi = (struct fileIdentDesc *)
 484                                         (dinfo->i_ext.i_data +
 485                                          fibh->soffset -
 486                                          udf_ext0_offset(dir) +
 487                                          dinfo->i_lenEAttr);
 488                 } else {
 489                         block = eloc.logicalBlockNum +
 490                                         ((elen - 1) >>
 491                                                 dir->i_sb->s_blocksize_bits);
 492                         fi = (struct fileIdentDesc *)
 493                                 (fibh->sbh->b_data + fibh->soffset);
 494                 }
 495         } else {
 496                 /* Round up last extent in the file */
 497                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 498                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 499                         epos.offset -= sizeof(struct short_ad);
 500                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 501                         epos.offset -= sizeof(struct long_ad);
 502                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 503                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 504                                         - 1) & ~(sb->s_blocksize - 1);
 505
 506                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 507                 fibh->eoffset += nfidlen - sb->s_blocksize;
 508                 if (fibh->sbh != fibh->ebh) {
 509                         brelse(fibh->sbh);
 510                         fibh->sbh = fibh->ebh;
 511                 }
 512
 513                 block = eloc.logicalBlockNum + ((elen - 1) >>
 514                                                 dir->i_sb->s_blocksize_bits);
 515                 fibh->ebh = udf_bread(dir,
 516                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 517                 if (!fibh->ebh)
 518                         goto out_err;
 519                 /* Extents could have been merged, invalidate our position */
 520                 brelse(epos.bh);
 521                 epos.bh = NULL;
 522                 epos.block = dinfo->i_location;
 523                 epos.offset = udf_file_entry_alloc_offset(dir);
 524
 525                 if (!fibh->soffset) {
 526                         /* Find the freshly allocated block */
 527                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 528                                 (EXT_RECORDED_ALLOCATED >> 30))
 529                                 ;
 530                         block = eloc.logicalBlockNum + ((elen - 1) >>
 531                                         dir->i_sb->s_blocksize_bits);
 532                         brelse(fibh->sbh);
 533                         fibh->sbh = fibh->ebh;
 534                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 535                 } else {
 536                         fi = (struct fileIdentDesc *)
 537                                 (fibh->sbh->b_data + sb->s_blocksize +
 538                                         fibh->soffset);
 539                 }
 540         }
 541
 542         memset(cfi, 0, sizeof(struct fileIdentDesc));
 543         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 544                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 545                             sizeof(struct tag));
 546         else
 547                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 548                             sizeof(struct tag));
 549         cfi->fileVersionNum = cpu_to_le16(1);
 550         cfi->lengthFileIdent = namelen;
 551         cfi->lengthOfImpUse = cpu_to_le16(0);
 552         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 553                 dir->i_size += nfidlen;
 554                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 555                         dinfo->i_lenAlloc += nfidlen;
 556                 else {
 557                         /* Find the last extent and truncate it to proper size */
 558                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 559                                 (EXT_RECORDED_ALLOCATED >> 30))
 560                                 ;
 561                         elen -= dinfo->i_lenExtents - dir->i_size;
 562                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 563                                 epos.offset -= sizeof(struct short_ad);
 564                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 565                                 epos.offset -= sizeof(struct long_ad);
 566                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 567                         dinfo->i_lenExtents = dir->i_size;
 568                 }
 569
 570                 mark_inode_dirty(dir);
 571                 goto out_ok;
 572         } else {
 573                 *err = -EIO;
 574                 goto out_err;
 575         }
 576
 577 out_err:
 578         fi = NULL;
 579         if (fibh->sbh != fibh->ebh)
 580                 brelse(fibh->ebh);
 581         brelse(fibh->sbh);
 582 out_ok:
 583         brelse(epos.bh);
 584         kfree(name);
 585         return fi;
 586 }
 587
 588 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 589                             struct udf_fileident_bh *fibh,
 590                             struct fileIdentDesc *cfi)
 591 {
 592         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 593
 594         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 595                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 596
 597         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 598 }
 599
 600 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 601 {
 602         struct udf_inode_info *iinfo = UDF_I(inode);
 603         struct inode *dir = d_inode(dentry->d_parent);
 604         struct udf_fileident_bh fibh;
 605         struct fileIdentDesc cfi, *fi;
 606         int err;
 607
 608         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 609         if (unlikely(!fi)) {
 610                 inode_dec_link_count(inode);
 611                 unlock_new_inode(inode);
 612                 iput(inode);
 613                 return err;
 614         }
 615         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 616         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 617         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 618                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 619         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 620         dir->i_ctime = dir->i_mtime = current_time(dir);
 621         mark_inode_dirty(dir);
 622         if (fibh.sbh != fibh.ebh)
 623                 brelse(fibh.ebh);
 624         brelse(fibh.sbh);
 625         d_instantiate_new(dentry, inode);
 626
 627         return 0;
 628 }
 629
 630 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 631                       bool excl)
 632 {
 633         struct inode *inode = udf_new_inode(dir, mode);
 634
 635         if (IS_ERR(inode))
 636                 return PTR_ERR(inode);
 637
 638         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 639                 inode->i_data.a_ops = &udf_adinicb_aops;
 640         else
 641                 inode->i_data.a_ops = &udf_aops;
 642         inode->i_op = &udf_file_inode_operations;
 643         inode->i_fop = &udf_file_operations;
 644         mark_inode_dirty(inode);
 645
 646         return udf_add_nondir(dentry, inode);
 647 }
 648
 649 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 650 {
 651         struct inode *inode = udf_new_inode(dir, mode);
 652
 653         if (IS_ERR(inode))
 654                 return PTR_ERR(inode);
 655
 656         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 657                 inode->i_data.a_ops = &udf_adinicb_aops;
 658         else
 659                 inode->i_data.a_ops = &udf_aops;
 660         inode->i_op = &udf_file_inode_operations;
 661         inode->i_fop = &udf_file_operations;
 662         mark_inode_dirty(inode);
 663         d_tmpfile(dentry, inode);
 664         unlock_new_inode(inode);
 665         return 0;
 666 }
 667
 668 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 669                      dev_t rdev)
 670 {
 671         struct inode *inode;
 672
 673         if (!old_valid_dev(rdev))
 674                 return -EINVAL;
 675
 676         inode = udf_new_inode(dir, mode);
 677         if (IS_ERR(inode))
 678                 return PTR_ERR(inode);
 679
 680         init_special_inode(inode, mode, rdev);
 681         return udf_add_nondir(dentry, inode);
 682 }
 683
 684 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 685 {
 686         struct inode *inode;
 687         struct udf_fileident_bh fibh;
 688         struct fileIdentDesc cfi, *fi;
 689         int err;
 690         struct udf_inode_info *dinfo = UDF_I(dir);
 691         struct udf_inode_info *iinfo;
 692
 693         inode = udf_new_inode(dir, S_IFDIR | mode);
 694         if (IS_ERR(inode))
 695                 return PTR_ERR(inode);
 696
 697         iinfo = UDF_I(inode);
 698         inode->i_op = &udf_dir_inode_operations;
 699         inode->i_fop = &udf_dir_operations;
 700         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 701         if (!fi) {
 702                 inode_dec_link_count(inode);
 703                 unlock_new_inode(inode);
 704                 iput(inode);
 705                 goto out;
 706         }
 707         set_nlink(inode, 2);
 708         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 709         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 710         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 711                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 712         cfi.fileCharacteristics =
 713                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 714         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 715         brelse(fibh.sbh);
 716         mark_inode_dirty(inode);
 717
 718         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 719         if (!fi) {
 720                 clear_nlink(inode);
 721                 mark_inode_dirty(inode);
 722                 unlock_new_inode(inode);
 723                 iput(inode);
 724                 goto out;
 725         }
 726         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 727         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 728         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 729                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 730         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 731         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 732         inc_nlink(dir);
 733         dir->i_ctime = dir->i_mtime = current_time(dir);
 734         mark_inode_dirty(dir);
 735         d_instantiate_new(dentry, inode);
 736         if (fibh.sbh != fibh.ebh)
 737                 brelse(fibh.ebh);
 738         brelse(fibh.sbh);
 739         err = 0;
 740
 741 out:
 742         return err;
 743 }
 744
 745 static int empty_dir(struct inode *dir)
 746 {
 747         struct fileIdentDesc *fi, cfi;
 748         struct udf_fileident_bh fibh;
 749         loff_t f_pos;
 750         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 751         udf_pblk_t block;
 752         struct kernel_lb_addr eloc;
 753         uint32_t elen;
 754         sector_t offset;
 755         struct extent_position epos = {};
 756         struct udf_inode_info *dinfo = UDF_I(dir);
 757
 758         f_pos = udf_ext0_offset(dir);
 759         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 760
 761         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 762                 fibh.sbh = fibh.ebh = NULL;
 763         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 764                               &epos, &eloc, &elen, &offset) ==
 765                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 766                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 767                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 768                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 769                                 epos.offset -= sizeof(struct short_ad);
 770                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 771                                 epos.offset -= sizeof(struct long_ad);
 772                 } else
 773                         offset = 0;
 774
 775                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 776                 if (!fibh.sbh) {
 777                         brelse(epos.bh);
 778                         return 0;
 779                 }
 780         } else {
 781                 brelse(epos.bh);
 782                 return 0;
 783         }
 784
 785         while (f_pos < size) {
 786                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 787                                         &elen, &offset);
 788                 if (!fi) {
 789                         if (fibh.sbh != fibh.ebh)
 790                                 brelse(fibh.ebh);
 791                         brelse(fibh.sbh);
 792                         brelse(epos.bh);
 793                         return 0;
 794                 }
 795
 796                 if (cfi.lengthFileIdent &&
 797                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 798                         if (fibh.sbh != fibh.ebh)
 799                                 brelse(fibh.ebh);
 800                         brelse(fibh.sbh);
 801                         brelse(epos.bh);
 802                         return 0;
 803                 }
 804         }
 805
 806         if (fibh.sbh != fibh.ebh)
 807                 brelse(fibh.ebh);
 808         brelse(fibh.sbh);
 809         brelse(epos.bh);
 810
 811         return 1;
 812 }
 813
 814 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 815 {
 816         int retval;
 817         struct inode *inode = d_inode(dentry);
 818         struct udf_fileident_bh fibh;
 819         struct fileIdentDesc *fi, cfi;
 820         struct kernel_lb_addr tloc;
 821
 822         retval = -ENOENT;
 823         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 824         if (IS_ERR_OR_NULL(fi)) {
 825                 if (fi)
 826                         retval = PTR_ERR(fi);
 827                 goto out;
 828         }
 829
 830         retval = -EIO;
 831         tloc = lelb_to_cpu(cfi.icb.extLocation);
 832         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 833                 goto end_rmdir;
 834         retval = -ENOTEMPTY;
 835         if (!empty_dir(inode))
 836                 goto end_rmdir;
 837         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 838         if (retval)
 839                 goto end_rmdir;
 840         if (inode->i_nlink != 2)
 841                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 842                          inode->i_nlink);
 843         clear_nlink(inode);
 844         inode->i_size = 0;
 845         inode_dec_link_count(dir);
 846         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 847                                                 current_time(inode);
 848         mark_inode_dirty(dir);
 849
 850 end_rmdir:
 851         if (fibh.sbh != fibh.ebh)
 852                 brelse(fibh.ebh);
 853         brelse(fibh.sbh);
 854
 855 out:
 856         return retval;
 857 }
 858
 859 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 860 {
 861         int retval;
 862         struct inode *inode = d_inode(dentry);
 863         struct udf_fileident_bh fibh;
 864         struct fileIdentDesc *fi;
 865         struct fileIdentDesc cfi;
 866         struct kernel_lb_addr tloc;
 867
 868         retval = -ENOENT;
 869         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 870
 871         if (IS_ERR_OR_NULL(fi)) {
 872                 if (fi)
 873                         retval = PTR_ERR(fi);
 874                 goto out;
 875         }
 876
 877         retval = -EIO;
 878         tloc = lelb_to_cpu(cfi.icb.extLocation);
 879         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 880                 goto end_unlink;
 881
 882         if (!inode->i_nlink) {
 883                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 884                           inode->i_ino, inode->i_nlink);
 885                 set_nlink(inode, 1);
 886         }
 887         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 888         if (retval)
 889                 goto end_unlink;
 890         dir->i_ctime = dir->i_mtime = current_time(dir);
 891         mark_inode_dirty(dir);
 892         inode_dec_link_count(inode);
 893         inode->i_ctime = dir->i_ctime;
 894         retval = 0;
 895
 896 end_unlink:
 897         if (fibh.sbh != fibh.ebh)
 898                 brelse(fibh.ebh);
 899         brelse(fibh.sbh);
 900
 901 out:
 902         return retval;
 903 }
 904
 905 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 906                        const char *symname)
 907 {
 908         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 909         struct pathComponent *pc;
 910         const char *compstart;
 911         struct extent_position epos = {};
 912         int eoffset, elen = 0;
 913         uint8_t *ea;
 914         int err;
 915         udf_pblk_t block;
 916         unsigned char *name = NULL;
 917         int namelen;
 918         struct udf_inode_info *iinfo;
 919         struct super_block *sb = dir->i_sb;
 920
 921         if (IS_ERR(inode))
 922                 return PTR_ERR(inode);
 923
 924         iinfo = UDF_I(inode);
 925         down_write(&iinfo->i_data_sem);
 926         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 927         if (!name) {
 928                 err = -ENOMEM;
 929                 goto out_no_entry;
 930         }
 931
 932         inode->i_data.a_ops = &udf_symlink_aops;
 933         inode->i_op = &udf_symlink_inode_operations;
 934         inode_nohighmem(inode);
 935
 936         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 937                 struct kernel_lb_addr eloc;
 938                 uint32_t bsize;
 939
 940                 block = udf_new_block(sb, inode,
 941                                 iinfo->i_location.partitionReferenceNum,
 942                                 iinfo->i_location.logicalBlockNum, &err);
 943                 if (!block)
 944                         goto out_no_entry;
 945                 epos.block = iinfo->i_location;
 946                 epos.offset = udf_file_entry_alloc_offset(inode);
 947                 epos.bh = NULL;
 948                 eloc.logicalBlockNum = block;
 949                 eloc.partitionReferenceNum =
 950                                 iinfo->i_location.partitionReferenceNum;
 951                 bsize = sb->s_blocksize;
 952                 iinfo->i_lenExtents = bsize;
 953                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 954                 brelse(epos.bh);
 955
 956                 block = udf_get_pblock(sb, block,
 957                                 iinfo->i_location.partitionReferenceNum,
 958                                 0);
 959                 epos.bh = udf_tgetblk(sb, block);
 960                 lock_buffer(epos.bh);
 961                 memset(epos.bh->b_data, 0x00, bsize);
 962                 set_buffer_uptodate(epos.bh);
 963                 unlock_buffer(epos.bh);
 964                 mark_buffer_dirty_inode(epos.bh, inode);
 965                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 966         } else
 967                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 968
 969         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 970         pc = (struct pathComponent *)ea;
 971
 972         if (*symname == '/') {
 973                 do {
 974                         symname++;
 975                 } while (*symname == '/');
 976
 977                 pc->componentType = 1;
 978                 pc->lengthComponentIdent = 0;
 979                 pc->componentFileVersionNum = 0;
 980                 elen += sizeof(struct pathComponent);
 981         }
 982
 983         err = -ENAMETOOLONG;
 984
 985         while (*symname) {
 986                 if (elen + sizeof(struct pathComponent) > eoffset)
 987                         goto out_no_entry;
 988
 989                 pc = (struct pathComponent *)(ea + elen);
 990
 991                 compstart = symname;
 992
 993                 do {
 994                         symname++;
 995                 } while (*symname && *symname != '/');
 996
 997                 pc->componentType = 5;
 998                 pc->lengthComponentIdent = 0;
 999                 pc->componentFileVersionNum = 0;
1000                 if (compstart[0] == '.') {
1001                         if ((symname - compstart) == 1)
1002                                 pc->componentType = 4;
1003                         else if ((symname - compstart) == 2 &&
1004                                         compstart[1] == '.')
1005                                 pc->componentType = 3;
1006                 }
1007
1008                 if (pc->componentType == 5) {
1009                         namelen = udf_put_filename(sb, compstart,
1010                                                    symname - compstart,
1011                                                    name, UDF_NAME_LEN_CS0);
1012                         if (!namelen)
1013                                 goto out_no_entry;
1014
1015                         if (elen + sizeof(struct pathComponent) + namelen >
1016                                         eoffset)
1017                                 goto out_no_entry;
1018                         else
1019                                 pc->lengthComponentIdent = namelen;
1020
1021                         memcpy(pc->componentIdent, name, namelen);
1022                 }
1023
1024                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1025
1026                 if (*symname) {
1027                         do {
1028                                 symname++;
1029                         } while (*symname == '/');
1030                 }
1031         }
1032
1033         brelse(epos.bh);
1034         inode->i_size = elen;
1035         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1036                 iinfo->i_lenAlloc = inode->i_size;
1037         else
1038                 udf_truncate_tail_extent(inode);
1039         mark_inode_dirty(inode);
1040         up_write(&iinfo->i_data_sem);
1041
1042         err = udf_add_nondir(dentry, inode);
1043 out:
1044         kfree(name);
1045         return err;
1046
1047 out_no_entry:
1048         up_write(&iinfo->i_data_sem);
1049         inode_dec_link_count(inode);
1050         unlock_new_inode(inode);
1051         iput(inode);
1052         goto out;
1053 }
1054
1055 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1056                     struct dentry *dentry)
1057 {
1058         struct inode *inode = d_inode(old_dentry);
1059         struct udf_fileident_bh fibh;
1060         struct fileIdentDesc cfi, *fi;
1061         int err;
1062
1063         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1064         if (!fi) {
1065                 return err;
1066         }
1067         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1068         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1069         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1070                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1071                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1072         }
1073         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1074         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1075                 mark_inode_dirty(dir);
1076
1077         if (fibh.sbh != fibh.ebh)
1078                 brelse(fibh.ebh);
1079         brelse(fibh.sbh);
1080         inc_nlink(inode);
1081         inode->i_ctime = current_time(inode);
1082         mark_inode_dirty(inode);
1083         dir->i_ctime = dir->i_mtime = current_time(dir);
1084         mark_inode_dirty(dir);
1085         ihold(inode);
1086         d_instantiate(dentry, inode);
1087
1088         return 0;
1089 }
1090
1091 /* Anybody can rename anything with this: the permission checks are left to the
1092  * higher-level routines.
1093  */
1094 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1095                       struct inode *new_dir, struct dentry *new_dentry,
1096                       unsigned int flags)
1097 {
1098         struct inode *old_inode = d_inode(old_dentry);
1099         struct inode *new_inode = d_inode(new_dentry);
1100         struct udf_fileident_bh ofibh, nfibh;
1101         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1102         struct fileIdentDesc ocfi, ncfi;
1103         struct buffer_head *dir_bh = NULL;
1104         int retval = -ENOENT;
1105         struct kernel_lb_addr tloc;
1106         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1107
1108         if (flags & ~RENAME_NOREPLACE)
1109                 return -EINVAL;
1110
1111         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1112         if (IS_ERR(ofi)) {
1113                 retval = PTR_ERR(ofi);
1114                 goto end_rename;
1115         }
1116
1117         if (ofibh.sbh != ofibh.ebh)
1118                 brelse(ofibh.ebh);
1119
1120         brelse(ofibh.sbh);
1121         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1122         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1123             != old_inode->i_ino)
1124                 goto end_rename;
1125
1126         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1127         if (IS_ERR(nfi)) {
1128                 retval = PTR_ERR(nfi);
1129                 goto end_rename;
1130         }
1131         if (nfi && !new_inode) {
1132                 if (nfibh.sbh != nfibh.ebh)
1133                         brelse(nfibh.ebh);
1134                 brelse(nfibh.sbh);
1135                 nfi = NULL;
1136         }
1137         if (S_ISDIR(old_inode->i_mode)) {
1138                 int offset = udf_ext0_offset(old_inode);
1139
1140                 if (new_inode) {
1141                         retval = -ENOTEMPTY;
1142                         if (!empty_dir(new_inode))
1143                                 goto end_rename;
1144                 }
1145                 retval = -EIO;
1146                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1147                         dir_fi = udf_get_fileident(
1148                                         old_iinfo->i_ext.i_data -
1149                                           (old_iinfo->i_efe ?
1150                                            sizeof(struct extendedFileEntry) :
1151                                            sizeof(struct fileEntry)),
1152                                         old_inode->i_sb->s_blocksize, &offset);
1153                 } else {
1154                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1155                         if (!dir_bh)
1156                                 goto end_rename;
1157                         dir_fi = udf_get_fileident(dir_bh->b_data,
1158                                         old_inode->i_sb->s_blocksize, &offset);
1159                 }
1160                 if (!dir_fi)
1161                         goto end_rename;
1162                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1163                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1164                                 old_dir->i_ino)
1165                         goto end_rename;
1166         }
1167         if (!nfi) {
1168                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1169                                     &retval);
1170                 if (!nfi)
1171                         goto end_rename;
1172         }
1173
1174         /*
1175          * Like most other Unix systems, set the ctime for inodes on a
1176          * rename.
1177          */
1178         old_inode->i_ctime = current_time(old_inode);
1179         mark_inode_dirty(old_inode);
1180
1181         /*
1182          * ok, that's it
1183          */
1184         ncfi.fileVersionNum = ocfi.fileVersionNum;
1185         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1186         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1187         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1188
1189         /* The old fid may have moved - find it again */
1190         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1191         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1192
1193         if (new_inode) {
1194                 new_inode->i_ctime = current_time(new_inode);
1195                 inode_dec_link_count(new_inode);
1196         }
1197         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1198         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1199         mark_inode_dirty(old_dir);
1200         mark_inode_dirty(new_dir);
1201
1202         if (dir_fi) {
1203                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1204                 udf_update_tag((char *)dir_fi,
1205                                 (sizeof(struct fileIdentDesc) +
1206                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1207                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1208                         mark_inode_dirty(old_inode);
1209                 else
1210                         mark_buffer_dirty_inode(dir_bh, old_inode);
1211
1212                 inode_dec_link_count(old_dir);
1213                 if (new_inode)
1214                         inode_dec_link_count(new_inode);
1215                 else {
1216                         inc_nlink(new_dir);
1217                         mark_inode_dirty(new_dir);
1218                 }
1219         }
1220
1221         if (ofi) {
1222                 if (ofibh.sbh != ofibh.ebh)
1223                         brelse(ofibh.ebh);
1224                 brelse(ofibh.sbh);
1225         }
1226
1227         retval = 0;
1228
1229 end_rename:
1230         brelse(dir_bh);
1231         if (nfi) {
1232                 if (nfibh.sbh != nfibh.ebh)
1233                         brelse(nfibh.ebh);
1234                 brelse(nfibh.sbh);
1235         }
1236
1237         return retval;
1238 }
1239
1240 static struct dentry *udf_get_parent(struct dentry *child)
1241 {
1242         struct kernel_lb_addr tloc;
1243         struct inode *inode = NULL;
1244         struct qstr dotdot = QSTR_INIT("..", 2);
1245         struct fileIdentDesc cfi;
1246         struct udf_fileident_bh fibh;
1247
1248         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1249                 return ERR_PTR(-EACCES);
1250
1251         if (fibh.sbh != fibh.ebh)
1252                 brelse(fibh.ebh);
1253         brelse(fibh.sbh);
1254
1255         tloc = lelb_to_cpu(cfi.icb.extLocation);
1256         inode = udf_iget(child->d_sb, &tloc);
1257         if (IS_ERR(inode))
1258                 return ERR_CAST(inode);
1259
1260         return d_obtain_alias(inode);
1261 }
1262
1263
1264 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1265                                         u16 partref, __u32 generation)
1266 {
1267         struct inode *inode;
1268         struct kernel_lb_addr loc;
1269
1270         if (block == 0)
1271                 return ERR_PTR(-ESTALE);
1272
1273         loc.logicalBlockNum = block;
1274         loc.partitionReferenceNum = partref;
1275         inode = udf_iget(sb, &loc);
1276
1277         if (IS_ERR(inode))
1278                 return ERR_CAST(inode);
1279
1280         if (generation && inode->i_generation != generation) {
1281                 iput(inode);
1282                 return ERR_PTR(-ESTALE);
1283         }
1284         return d_obtain_alias(inode);
1285 }
1286
1287 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1288                                        struct fid *fid, int fh_len, int fh_type)
1289 {
1290         if (fh_len < 3 ||
1291             (fh_type != FILEID_UDF_WITH_PARENT &&
1292              fh_type != FILEID_UDF_WITHOUT_PARENT))
1293                 return NULL;
1294
1295         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1296                         fid->udf.generation);
1297 }
1298
1299 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1300                                        struct fid *fid, int fh_len, int fh_type)
1301 {
1302         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1303                 return NULL;
1304
1305         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1306                                  fid->udf.parent_partref,
1307                                  fid->udf.parent_generation);
1308 }
1309 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1310                          struct inode *parent)
1311 {
1312         int len = *lenp;
1313         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1314         struct fid *fid = (struct fid *)fh;
1315         int type = FILEID_UDF_WITHOUT_PARENT;
1316
1317         if (parent && (len < 5)) {
1318                 *lenp = 5;
1319                 return FILEID_INVALID;
1320         } else if (len < 3) {
1321                 *lenp = 3;
1322                 return FILEID_INVALID;
1323         }
1324
1325         *lenp = 3;
1326         fid->udf.block = location.logicalBlockNum;
1327         fid->udf.partref = location.partitionReferenceNum;
1328         fid->udf.parent_partref = 0;
1329         fid->udf.generation = inode->i_generation;
1330
1331         if (parent) {
1332                 location = UDF_I(parent)->i_location;
1333                 fid->udf.parent_block = location.logicalBlockNum;
1334                 fid->udf.parent_partref = location.partitionReferenceNum;
1335                 fid->udf.parent_generation = inode->i_generation;
1336                 *lenp = 5;
1337                 type = FILEID_UDF_WITH_PARENT;
1338         }
1339
1340         return type;
1341 }
1342
1343 const struct export_operations udf_export_ops = {
1344         .encode_fh      = udf_encode_fh,
1345         .fh_to_dentry   = udf_fh_to_dentry,
1346         .fh_to_parent   = udf_fh_to_parent,
1347         .get_parent     = udf_get_parent,
1348 };
1349
1350 const struct inode_operations udf_dir_inode_operations = {
1351         .lookup                         = udf_lookup,
1352         .create                         = udf_create,
1353         .link                           = udf_link,
1354         .unlink                         = udf_unlink,
1355         .symlink                        = udf_symlink,
1356         .mkdir                          = udf_mkdir,
1357         .rmdir                          = udf_rmdir,
1358         .mknod                          = udf_mknod,
1359         .rename                         = udf_rename,
1360         .tmpfile                        = udf_tmpfile,
1361 };