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