namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2004 Ben Fennema
  14  *  (C) 1999-2000 Stelias Computing Inc
  15  *
  16  * HISTORY
  17  *
  18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  19  *  04/19/99 blf  link, mknod, symlink support
  20  */
  21
  22 #include "udfdecl.h"
  23
  24 #include "udf_i.h"
  25 #include "udf_sb.h"
  26 #include <linux/string.h>
  27 #include <linux/errno.h>
  28 #include <linux/mm.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched.h>
  31 #include <linux/crc-itu-t.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/iversion.h>
  34
  35 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  36                             const unsigned char *name2)
  37 {
  38         if (len1 != len2)
  39                 return 0;
  40
  41         return !memcmp(name1, name2, len1);
  42 }
  43
  44 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  45                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  46                  uint8_t *impuse, uint8_t *fileident)
  47 {
  48         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  49         uint16_t crc;
  50         int offset;
  51         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  52         uint8_t lfi = cfi->lengthFileIdent;
  53         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  54                 sizeof(struct fileIdentDesc);
  55         int adinicb = 0;
  56
  57         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  58                 adinicb = 1;
  59
  60         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  61
  62         if (impuse) {
  63                 if (adinicb || (offset + liu < 0)) {
  64                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  65                 } else if (offset >= 0) {
  66                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  67                 } else {
  68                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  69                         memcpy(fibh->ebh->b_data, impuse - offset,
  70                                 liu + offset);
  71                 }
  72         }
  73
  74         offset += liu;
  75
  76         if (fileident) {
  77                 if (adinicb || (offset + lfi < 0)) {
  78                         memcpy(sfi->impUse + liu, fileident, lfi);
  79                 } else if (offset >= 0) {
  80                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  81                 } else {
  82                         memcpy(sfi->impUse + liu, fileident, -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(sfi->impUse + liu + lfi, 0x00, padlen);
  92         } else if (offset >= 0) {
  93                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  94         } else {
  95                 memset(sfi->impUse + 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         inode_inc_iversion(inode);
 139
 140         return 0;
 141 }
 142
 143 /**
 144  * udf_find_entry - find entry in given directory.
 145  *
 146  * @dir:        directory inode to search in
 147  * @child:      qstr of the name
 148  * @fibh:       buffer head / inode with file identifier descriptor we found
 149  * @cfi:        found file identifier descriptor with given name
 150  *
 151  * This function searches in the directory @dir for a file name @child. When
 152  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 153  * directories) containing the file identifier descriptor (FID). In that case
 154  * the function returns pointer to the FID in the buffer or inode - but note
 155  * that FID may be split among two buffers (blocks) so accessing it via that
 156  * pointer isn't easily possible. This pointer can be used only as an iterator
 157  * for other directory manipulation functions. For inspection of the FID @cfi
 158  * can be used - the found FID is copied there.
 159  *
 160  * Returns pointer to FID, NULL when nothing found, or error code.
 161  */
 162 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 163                                             const struct qstr *child,
 164                                             struct udf_fileident_bh *fibh,
 165                                             struct fileIdentDesc *cfi)
 166 {
 167         struct fileIdentDesc *fi = NULL;
 168         loff_t f_pos;
 169         udf_pblk_t block;
 170         int flen;
 171         unsigned char *fname = NULL, *copy_name = NULL;
 172         unsigned char *nameptr;
 173         uint8_t lfi;
 174         uint16_t liu;
 175         loff_t size;
 176         struct kernel_lb_addr eloc;
 177         uint32_t elen;
 178         sector_t offset;
 179         struct extent_position epos = {};
 180         struct udf_inode_info *dinfo = UDF_I(dir);
 181         int isdotdot = child->len == 2 &&
 182                 child->name[0] == '.' && child->name[1] == '.';
 183         struct super_block *sb = dir->i_sb;
 184
 185         size = udf_ext0_offset(dir) + dir->i_size;
 186         f_pos = udf_ext0_offset(dir);
 187
 188         fibh->sbh = fibh->ebh = NULL;
 189         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 190         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 191                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 192                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 193                         fi = ERR_PTR(-EIO);
 194                         goto out_err;
 195                 }
 196
 197                 block = udf_get_lb_pblock(sb, &eloc, offset);
 198                 if ((++offset << sb->s_blocksize_bits) < elen) {
 199                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 200                                 epos.offset -= sizeof(struct short_ad);
 201                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 202                                 epos.offset -= sizeof(struct long_ad);
 203                 } else
 204                         offset = 0;
 205
 206                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 207                 if (!fibh->sbh) {
 208                         fi = ERR_PTR(-EIO);
 209                         goto out_err;
 210                 }
 211         }
 212
 213         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 214         if (!fname) {
 215                 fi = ERR_PTR(-ENOMEM);
 216                 goto out_err;
 217         }
 218
 219         while (f_pos < size) {
 220                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 221                                         &elen, &offset);
 222                 if (!fi) {
 223                         fi = ERR_PTR(-EIO);
 224                         goto out_err;
 225                 }
 226
 227                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 228                 lfi = cfi->lengthFileIdent;
 229
 230                 if (fibh->sbh == fibh->ebh) {
 231                         nameptr = udf_get_fi_ident(fi);
 232                 } else {
 233                         int poffset;    /* Unpaded ending offset */
 234
 235                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 236                                         liu + lfi;
 237
 238                         if (poffset >= lfi)
 239                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 240                                                       poffset - lfi);
 241                         else {
 242                                 if (!copy_name) {
 243                                         copy_name = kmalloc(UDF_NAME_LEN_CS0,
 244                                                             GFP_NOFS);
 245                                         if (!copy_name) {
 246                                                 fi = ERR_PTR(-ENOMEM);
 247                                                 goto out_err;
 248                                         }
 249                                 }
 250                                 nameptr = copy_name;
 251                                 memcpy(nameptr, udf_get_fi_ident(fi),
 252                                         lfi - poffset);
 253                                 memcpy(nameptr + lfi - poffset,
 254                                         fibh->ebh->b_data, poffset);
 255                         }
 256                 }
 257
 258                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 259                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 260                                 continue;
 261                 }
 262
 263                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 264                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 265                                 continue;
 266                 }
 267
 268                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 269                     isdotdot)
 270                         goto out_ok;
 271
 272                 if (!lfi)
 273                         continue;
 274
 275                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 276                 if (flen < 0) {
 277                         fi = ERR_PTR(flen);
 278                         goto out_err;
 279                 }
 280
 281                 if (udf_match(flen, fname, child->len, child->name))
 282                         goto out_ok;
 283         }
 284
 285         fi = NULL;
 286 out_err:
 287         if (fibh->sbh != fibh->ebh)
 288                 brelse(fibh->ebh);
 289         brelse(fibh->sbh);
 290 out_ok:
 291         brelse(epos.bh);
 292         kfree(fname);
 293         kfree(copy_name);
 294
 295         return fi;
 296 }
 297
 298 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 299                                  unsigned int flags)
 300 {
 301         struct inode *inode = NULL;
 302         struct fileIdentDesc cfi;
 303         struct udf_fileident_bh fibh;
 304         struct fileIdentDesc *fi;
 305
 306         if (dentry->d_name.len > UDF_NAME_LEN)
 307                 return ERR_PTR(-ENAMETOOLONG);
 308
 309         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 310         if (IS_ERR(fi))
 311                 return ERR_CAST(fi);
 312
 313         if (fi) {
 314                 struct kernel_lb_addr loc;
 315
 316                 if (fibh.sbh != fibh.ebh)
 317                         brelse(fibh.ebh);
 318                 brelse(fibh.sbh);
 319
 320                 loc = lelb_to_cpu(cfi.icb.extLocation);
 321                 inode = udf_iget(dir->i_sb, &loc);
 322                 if (IS_ERR(inode))
 323                         return ERR_CAST(inode);
 324         }
 325
 326         return d_splice_alias(inode, dentry);
 327 }
 328
 329 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 330                                            struct dentry *dentry,
 331                                            struct udf_fileident_bh *fibh,
 332                                            struct fileIdentDesc *cfi, int *err)
 333 {
 334         struct super_block *sb = dir->i_sb;
 335         struct fileIdentDesc *fi = NULL;
 336         unsigned char *name = NULL;
 337         int namelen;
 338         loff_t f_pos;
 339         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 340         int nfidlen;
 341         udf_pblk_t block;
 342         struct kernel_lb_addr eloc;
 343         uint32_t elen = 0;
 344         sector_t offset;
 345         struct extent_position epos = {};
 346         struct udf_inode_info *dinfo;
 347
 348         fibh->sbh = fibh->ebh = NULL;
 349         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 350         if (!name) {
 351                 *err = -ENOMEM;
 352                 goto out_err;
 353         }
 354
 355         if (dentry) {
 356                 if (!dentry->d_name.len) {
 357                         *err = -EINVAL;
 358                         goto out_err;
 359                 }
 360                 namelen = udf_put_filename(sb, dentry->d_name.name,
 361                                            dentry->d_name.len,
 362                                            name, UDF_NAME_LEN_CS0);
 363                 if (!namelen) {
 364                         *err = -ENAMETOOLONG;
 365                         goto out_err;
 366                 }
 367         } else {
 368                 namelen = 0;
 369         }
 370
 371         nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 372
 373         f_pos = udf_ext0_offset(dir);
 374
 375         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 376         dinfo = UDF_I(dir);
 377         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 378                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 379                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 380                         block = udf_get_lb_pblock(dir->i_sb,
 381                                         &dinfo->i_location, 0);
 382                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 383                         goto add;
 384                 }
 385                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 386                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 387                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 388                                 epos.offset -= sizeof(struct short_ad);
 389                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 390                                 epos.offset -= sizeof(struct long_ad);
 391                 } else
 392                         offset = 0;
 393
 394                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 395                 if (!fibh->sbh) {
 396                         *err = -EIO;
 397                         goto out_err;
 398                 }
 399
 400                 block = dinfo->i_location.logicalBlockNum;
 401         }
 402
 403         while (f_pos < size) {
 404                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 405                                         &elen, &offset);
 406
 407                 if (!fi) {
 408                         *err = -EIO;
 409                         goto out_err;
 410                 }
 411
 412                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 413                         if (udf_dir_entry_len(cfi) == nfidlen) {
 414                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 415                                 cfi->fileVersionNum = cpu_to_le16(1);
 416                                 cfi->fileCharacteristics = 0;
 417                                 cfi->lengthFileIdent = namelen;
 418                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 419                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 420                                                   name))
 421                                         goto out_ok;
 422                                 else {
 423                                         *err = -EIO;
 424                                         goto out_err;
 425                                 }
 426                         }
 427                 }
 428         }
 429
 430 add:
 431         f_pos += nfidlen;
 432
 433         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 434             sb->s_blocksize - fibh->eoffset < nfidlen) {
 435                 brelse(epos.bh);
 436                 epos.bh = NULL;
 437                 fibh->soffset -= udf_ext0_offset(dir);
 438                 fibh->eoffset -= udf_ext0_offset(dir);
 439                 f_pos -= udf_ext0_offset(dir);
 440                 if (fibh->sbh != fibh->ebh)
 441                         brelse(fibh->ebh);
 442                 brelse(fibh->sbh);
 443                 fibh->sbh = fibh->ebh =
 444                                 udf_expand_dir_adinicb(dir, &block, err);
 445                 if (!fibh->sbh)
 446                         goto out_err;
 447                 epos.block = dinfo->i_location;
 448                 epos.offset = udf_file_entry_alloc_offset(dir);
 449                 /* Load extent udf_expand_dir_adinicb() has created */
 450                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 451         }
 452
 453         /* Entry fits into current block? */
 454         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 455                 fibh->soffset = fibh->eoffset;
 456                 fibh->eoffset += nfidlen;
 457                 if (fibh->sbh != fibh->ebh) {
 458                         brelse(fibh->sbh);
 459                         fibh->sbh = fibh->ebh;
 460                 }
 461
 462                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 463                         block = dinfo->i_location.logicalBlockNum;
 464                         fi = (struct fileIdentDesc *)
 465                                         (dinfo->i_data + fibh->soffset -
 466                                          udf_ext0_offset(dir) +
 467                                          dinfo->i_lenEAttr);
 468                 } else {
 469                         block = eloc.logicalBlockNum +
 470                                         ((elen - 1) >>
 471                                                 dir->i_sb->s_blocksize_bits);
 472                         fi = (struct fileIdentDesc *)
 473                                 (fibh->sbh->b_data + fibh->soffset);
 474                 }
 475         } else {
 476                 /* Round up last extent in the file */
 477                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 478                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 479                         epos.offset -= sizeof(struct short_ad);
 480                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 481                         epos.offset -= sizeof(struct long_ad);
 482                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 483                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 484                                         - 1) & ~(sb->s_blocksize - 1);
 485
 486                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 487                 fibh->eoffset += nfidlen - sb->s_blocksize;
 488                 if (fibh->sbh != fibh->ebh) {
 489                         brelse(fibh->sbh);
 490                         fibh->sbh = fibh->ebh;
 491                 }
 492
 493                 block = eloc.logicalBlockNum + ((elen - 1) >>
 494                                                 dir->i_sb->s_blocksize_bits);
 495                 fibh->ebh = udf_bread(dir,
 496                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 497                 if (!fibh->ebh)
 498                         goto out_err;
 499                 /* Extents could have been merged, invalidate our position */
 500                 brelse(epos.bh);
 501                 epos.bh = NULL;
 502                 epos.block = dinfo->i_location;
 503                 epos.offset = udf_file_entry_alloc_offset(dir);
 504
 505                 if (!fibh->soffset) {
 506                         /* Find the freshly allocated block */
 507                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 508                                 (EXT_RECORDED_ALLOCATED >> 30))
 509                                 ;
 510                         block = eloc.logicalBlockNum + ((elen - 1) >>
 511                                         dir->i_sb->s_blocksize_bits);
 512                         brelse(fibh->sbh);
 513                         fibh->sbh = fibh->ebh;
 514                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 515                 } else {
 516                         fi = (struct fileIdentDesc *)
 517                                 (fibh->sbh->b_data + sb->s_blocksize +
 518                                         fibh->soffset);
 519                 }
 520         }
 521
 522         memset(cfi, 0, sizeof(struct fileIdentDesc));
 523         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 524                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 525                             sizeof(struct tag));
 526         else
 527                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 528                             sizeof(struct tag));
 529         cfi->fileVersionNum = cpu_to_le16(1);
 530         cfi->lengthFileIdent = namelen;
 531         cfi->lengthOfImpUse = cpu_to_le16(0);
 532         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 533                 dir->i_size += nfidlen;
 534                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 535                         dinfo->i_lenAlloc += nfidlen;
 536                 else {
 537                         /* Find the last extent and truncate it to proper size */
 538                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 539                                 (EXT_RECORDED_ALLOCATED >> 30))
 540                                 ;
 541                         elen -= dinfo->i_lenExtents - dir->i_size;
 542                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 543                                 epos.offset -= sizeof(struct short_ad);
 544                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 545                                 epos.offset -= sizeof(struct long_ad);
 546                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 547                         dinfo->i_lenExtents = dir->i_size;
 548                 }
 549
 550                 mark_inode_dirty(dir);
 551                 goto out_ok;
 552         } else {
 553                 *err = -EIO;
 554                 goto out_err;
 555         }
 556
 557 out_err:
 558         fi = NULL;
 559         if (fibh->sbh != fibh->ebh)
 560                 brelse(fibh->ebh);
 561         brelse(fibh->sbh);
 562 out_ok:
 563         brelse(epos.bh);
 564         kfree(name);
 565         return fi;
 566 }
 567
 568 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 569                             struct udf_fileident_bh *fibh,
 570                             struct fileIdentDesc *cfi)
 571 {
 572         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 573
 574         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 575                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 576
 577         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 578 }
 579
 580 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 581 {
 582         struct udf_inode_info *iinfo = UDF_I(inode);
 583         struct inode *dir = d_inode(dentry->d_parent);
 584         struct udf_fileident_bh fibh;
 585         struct fileIdentDesc cfi, *fi;
 586         int err;
 587
 588         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 589         if (unlikely(!fi)) {
 590                 inode_dec_link_count(inode);
 591                 discard_new_inode(inode);
 592                 return err;
 593         }
 594         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 595         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 596         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 597                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 598         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 599         dir->i_ctime = dir->i_mtime = current_time(dir);
 600         mark_inode_dirty(dir);
 601         if (fibh.sbh != fibh.ebh)
 602                 brelse(fibh.ebh);
 603         brelse(fibh.sbh);
 604         d_instantiate_new(dentry, inode);
 605
 606         return 0;
 607 }
 608
 609 static int udf_create(struct user_namespace *mnt_userns, struct inode *dir,
 610                       struct dentry *dentry, umode_t mode, bool excl)
 611 {
 612         struct inode *inode = udf_new_inode(dir, mode);
 613
 614         if (IS_ERR(inode))
 615                 return PTR_ERR(inode);
 616
 617         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 618                 inode->i_data.a_ops = &udf_adinicb_aops;
 619         else
 620                 inode->i_data.a_ops = &udf_aops;
 621         inode->i_op = &udf_file_inode_operations;
 622         inode->i_fop = &udf_file_operations;
 623         mark_inode_dirty(inode);
 624
 625         return udf_add_nondir(dentry, inode);
 626 }
 627
 628 static int udf_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 629                        struct file *file, umode_t mode)
 630 {
 631         struct inode *inode = udf_new_inode(dir, mode);
 632
 633         if (IS_ERR(inode))
 634                 return PTR_ERR(inode);
 635
 636         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 637                 inode->i_data.a_ops = &udf_adinicb_aops;
 638         else
 639                 inode->i_data.a_ops = &udf_aops;
 640         inode->i_op = &udf_file_inode_operations;
 641         inode->i_fop = &udf_file_operations;
 642         mark_inode_dirty(inode);
 643         d_tmpfile(file, inode);
 644         unlock_new_inode(inode);
 645         return finish_open_simple(file, 0);
 646 }
 647
 648 static int udf_mknod(struct user_namespace *mnt_userns, struct inode *dir,
 649                      struct dentry *dentry, umode_t mode, dev_t rdev)
 650 {
 651         struct inode *inode;
 652
 653         if (!old_valid_dev(rdev))
 654                 return -EINVAL;
 655
 656         inode = udf_new_inode(dir, mode);
 657         if (IS_ERR(inode))
 658                 return PTR_ERR(inode);
 659
 660         init_special_inode(inode, mode, rdev);
 661         return udf_add_nondir(dentry, inode);
 662 }
 663
 664 static int udf_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 665                      struct dentry *dentry, umode_t mode)
 666 {
 667         struct inode *inode;
 668         struct udf_fileident_bh fibh;
 669         struct fileIdentDesc cfi, *fi;
 670         int err;
 671         struct udf_inode_info *dinfo = UDF_I(dir);
 672         struct udf_inode_info *iinfo;
 673
 674         inode = udf_new_inode(dir, S_IFDIR | mode);
 675         if (IS_ERR(inode))
 676                 return PTR_ERR(inode);
 677
 678         iinfo = UDF_I(inode);
 679         inode->i_op = &udf_dir_inode_operations;
 680         inode->i_fop = &udf_dir_operations;
 681         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 682         if (!fi) {
 683                 inode_dec_link_count(inode);
 684                 discard_new_inode(inode);
 685                 goto out;
 686         }
 687         set_nlink(inode, 2);
 688         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 689         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 690         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 691                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 692         cfi.fileCharacteristics =
 693                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 694         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 695         brelse(fibh.sbh);
 696         mark_inode_dirty(inode);
 697
 698         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 699         if (!fi) {
 700                 clear_nlink(inode);
 701                 mark_inode_dirty(inode);
 702                 discard_new_inode(inode);
 703                 goto out;
 704         }
 705         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 706         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 707         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 708                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 709         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 710         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 711         inc_nlink(dir);
 712         dir->i_ctime = dir->i_mtime = current_time(dir);
 713         mark_inode_dirty(dir);
 714         d_instantiate_new(dentry, inode);
 715         if (fibh.sbh != fibh.ebh)
 716                 brelse(fibh.ebh);
 717         brelse(fibh.sbh);
 718         err = 0;
 719
 720 out:
 721         return err;
 722 }
 723
 724 static int empty_dir(struct inode *dir)
 725 {
 726         struct fileIdentDesc *fi, cfi;
 727         struct udf_fileident_bh fibh;
 728         loff_t f_pos;
 729         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 730         udf_pblk_t block;
 731         struct kernel_lb_addr eloc;
 732         uint32_t elen;
 733         sector_t offset;
 734         struct extent_position epos = {};
 735         struct udf_inode_info *dinfo = UDF_I(dir);
 736
 737         f_pos = udf_ext0_offset(dir);
 738         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 739
 740         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 741                 fibh.sbh = fibh.ebh = NULL;
 742         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 743                               &epos, &eloc, &elen, &offset) ==
 744                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 745                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 746                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 747                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 748                                 epos.offset -= sizeof(struct short_ad);
 749                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 750                                 epos.offset -= sizeof(struct long_ad);
 751                 } else
 752                         offset = 0;
 753
 754                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 755                 if (!fibh.sbh) {
 756                         brelse(epos.bh);
 757                         return 0;
 758                 }
 759         } else {
 760                 brelse(epos.bh);
 761                 return 0;
 762         }
 763
 764         while (f_pos < size) {
 765                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 766                                         &elen, &offset);
 767                 if (!fi) {
 768                         if (fibh.sbh != fibh.ebh)
 769                                 brelse(fibh.ebh);
 770                         brelse(fibh.sbh);
 771                         brelse(epos.bh);
 772                         return 0;
 773                 }
 774
 775                 if (cfi.lengthFileIdent &&
 776                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 777                         if (fibh.sbh != fibh.ebh)
 778                                 brelse(fibh.ebh);
 779                         brelse(fibh.sbh);
 780                         brelse(epos.bh);
 781                         return 0;
 782                 }
 783         }
 784
 785         if (fibh.sbh != fibh.ebh)
 786                 brelse(fibh.ebh);
 787         brelse(fibh.sbh);
 788         brelse(epos.bh);
 789
 790         return 1;
 791 }
 792
 793 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 794 {
 795         int retval;
 796         struct inode *inode = d_inode(dentry);
 797         struct udf_fileident_bh fibh;
 798         struct fileIdentDesc *fi, cfi;
 799         struct kernel_lb_addr tloc;
 800
 801         retval = -ENOENT;
 802         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 803         if (IS_ERR_OR_NULL(fi)) {
 804                 if (fi)
 805                         retval = PTR_ERR(fi);
 806                 goto out;
 807         }
 808
 809         retval = -EIO;
 810         tloc = lelb_to_cpu(cfi.icb.extLocation);
 811         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 812                 goto end_rmdir;
 813         retval = -ENOTEMPTY;
 814         if (!empty_dir(inode))
 815                 goto end_rmdir;
 816         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 817         if (retval)
 818                 goto end_rmdir;
 819         if (inode->i_nlink != 2)
 820                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 821                          inode->i_nlink);
 822         clear_nlink(inode);
 823         inode->i_size = 0;
 824         inode_dec_link_count(dir);
 825         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 826                                                 current_time(inode);
 827         mark_inode_dirty(dir);
 828
 829 end_rmdir:
 830         if (fibh.sbh != fibh.ebh)
 831                 brelse(fibh.ebh);
 832         brelse(fibh.sbh);
 833
 834 out:
 835         return retval;
 836 }
 837
 838 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 839 {
 840         int retval;
 841         struct inode *inode = d_inode(dentry);
 842         struct udf_fileident_bh fibh;
 843         struct fileIdentDesc *fi;
 844         struct fileIdentDesc cfi;
 845         struct kernel_lb_addr tloc;
 846
 847         retval = -ENOENT;
 848         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 849
 850         if (IS_ERR_OR_NULL(fi)) {
 851                 if (fi)
 852                         retval = PTR_ERR(fi);
 853                 goto out;
 854         }
 855
 856         retval = -EIO;
 857         tloc = lelb_to_cpu(cfi.icb.extLocation);
 858         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 859                 goto end_unlink;
 860
 861         if (!inode->i_nlink) {
 862                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 863                           inode->i_ino, inode->i_nlink);
 864                 set_nlink(inode, 1);
 865         }
 866         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 867         if (retval)
 868                 goto end_unlink;
 869         dir->i_ctime = dir->i_mtime = current_time(dir);
 870         mark_inode_dirty(dir);
 871         inode_dec_link_count(inode);
 872         inode->i_ctime = dir->i_ctime;
 873         retval = 0;
 874
 875 end_unlink:
 876         if (fibh.sbh != fibh.ebh)
 877                 brelse(fibh.ebh);
 878         brelse(fibh.sbh);
 879
 880 out:
 881         return retval;
 882 }
 883
 884 static int udf_symlink(struct user_namespace *mnt_userns, struct inode *dir,
 885                        struct dentry *dentry, const char *symname)
 886 {
 887         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 888         struct pathComponent *pc;
 889         const char *compstart;
 890         struct extent_position epos = {};
 891         int eoffset, elen = 0;
 892         uint8_t *ea;
 893         int err;
 894         udf_pblk_t block;
 895         unsigned char *name = NULL;
 896         int namelen;
 897         struct udf_inode_info *iinfo;
 898         struct super_block *sb = dir->i_sb;
 899
 900         if (IS_ERR(inode))
 901                 return PTR_ERR(inode);
 902
 903         iinfo = UDF_I(inode);
 904         down_write(&iinfo->i_data_sem);
 905         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 906         if (!name) {
 907                 err = -ENOMEM;
 908                 goto out_no_entry;
 909         }
 910
 911         inode->i_data.a_ops = &udf_symlink_aops;
 912         inode->i_op = &udf_symlink_inode_operations;
 913         inode_nohighmem(inode);
 914
 915         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 916                 struct kernel_lb_addr eloc;
 917                 uint32_t bsize;
 918
 919                 block = udf_new_block(sb, inode,
 920                                 iinfo->i_location.partitionReferenceNum,
 921                                 iinfo->i_location.logicalBlockNum, &err);
 922                 if (!block)
 923                         goto out_no_entry;
 924                 epos.block = iinfo->i_location;
 925                 epos.offset = udf_file_entry_alloc_offset(inode);
 926                 epos.bh = NULL;
 927                 eloc.logicalBlockNum = block;
 928                 eloc.partitionReferenceNum =
 929                                 iinfo->i_location.partitionReferenceNum;
 930                 bsize = sb->s_blocksize;
 931                 iinfo->i_lenExtents = bsize;
 932                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 933                 brelse(epos.bh);
 934
 935                 block = udf_get_pblock(sb, block,
 936                                 iinfo->i_location.partitionReferenceNum,
 937                                 0);
 938                 epos.bh = udf_tgetblk(sb, block);
 939                 if (unlikely(!epos.bh)) {
 940                         err = -ENOMEM;
 941                         goto out_no_entry;
 942                 }
 943                 lock_buffer(epos.bh);
 944                 memset(epos.bh->b_data, 0x00, bsize);
 945                 set_buffer_uptodate(epos.bh);
 946                 unlock_buffer(epos.bh);
 947                 mark_buffer_dirty_inode(epos.bh, inode);
 948                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 949         } else
 950                 ea = iinfo->i_data + iinfo->i_lenEAttr;
 951
 952         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 953         pc = (struct pathComponent *)ea;
 954
 955         if (*symname == '/') {
 956                 do {
 957                         symname++;
 958                 } while (*symname == '/');
 959
 960                 pc->componentType = 1;
 961                 pc->lengthComponentIdent = 0;
 962                 pc->componentFileVersionNum = 0;
 963                 elen += sizeof(struct pathComponent);
 964         }
 965
 966         err = -ENAMETOOLONG;
 967
 968         while (*symname) {
 969                 if (elen + sizeof(struct pathComponent) > eoffset)
 970                         goto out_no_entry;
 971
 972                 pc = (struct pathComponent *)(ea + elen);
 973
 974                 compstart = symname;
 975
 976                 do {
 977                         symname++;
 978                 } while (*symname && *symname != '/');
 979
 980                 pc->componentType = 5;
 981                 pc->lengthComponentIdent = 0;
 982                 pc->componentFileVersionNum = 0;
 983                 if (compstart[0] == '.') {
 984                         if ((symname - compstart) == 1)
 985                                 pc->componentType = 4;
 986                         else if ((symname - compstart) == 2 &&
 987                                         compstart[1] == '.')
 988                                 pc->componentType = 3;
 989                 }
 990
 991                 if (pc->componentType == 5) {
 992                         namelen = udf_put_filename(sb, compstart,
 993                                                    symname - compstart,
 994                                                    name, UDF_NAME_LEN_CS0);
 995                         if (!namelen)
 996                                 goto out_no_entry;
 997
 998                         if (elen + sizeof(struct pathComponent) + namelen >
 999                                         eoffset)
1000                                 goto out_no_entry;
1001                         else
1002                                 pc->lengthComponentIdent = namelen;
1003
1004                         memcpy(pc->componentIdent, name, namelen);
1005                 }
1006
1007                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1008
1009                 if (*symname) {
1010                         do {
1011                                 symname++;
1012                         } while (*symname == '/');
1013                 }
1014         }
1015
1016         brelse(epos.bh);
1017         inode->i_size = elen;
1018         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1019                 iinfo->i_lenAlloc = inode->i_size;
1020         else
1021                 udf_truncate_tail_extent(inode);
1022         mark_inode_dirty(inode);
1023         up_write(&iinfo->i_data_sem);
1024
1025         err = udf_add_nondir(dentry, inode);
1026 out:
1027         kfree(name);
1028         return err;
1029
1030 out_no_entry:
1031         up_write(&iinfo->i_data_sem);
1032         inode_dec_link_count(inode);
1033         discard_new_inode(inode);
1034         goto out;
1035 }
1036
1037 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1038                     struct dentry *dentry)
1039 {
1040         struct inode *inode = d_inode(old_dentry);
1041         struct udf_fileident_bh fibh;
1042         struct fileIdentDesc cfi, *fi;
1043         int err;
1044
1045         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1046         if (!fi) {
1047                 return err;
1048         }
1049         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1050         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1051         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1052                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1053                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1054         }
1055         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1056         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1057                 mark_inode_dirty(dir);
1058
1059         if (fibh.sbh != fibh.ebh)
1060                 brelse(fibh.ebh);
1061         brelse(fibh.sbh);
1062         inc_nlink(inode);
1063         inode->i_ctime = current_time(inode);
1064         mark_inode_dirty(inode);
1065         dir->i_ctime = dir->i_mtime = current_time(dir);
1066         mark_inode_dirty(dir);
1067         ihold(inode);
1068         d_instantiate(dentry, inode);
1069
1070         return 0;
1071 }
1072
1073 /* Anybody can rename anything with this: the permission checks are left to the
1074  * higher-level routines.
1075  */
1076 static int udf_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
1077                       struct dentry *old_dentry, struct inode *new_dir,
1078                       struct dentry *new_dentry, unsigned int flags)
1079 {
1080         struct inode *old_inode = d_inode(old_dentry);
1081         struct inode *new_inode = d_inode(new_dentry);
1082         struct udf_fileident_bh ofibh, nfibh;
1083         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1084         struct fileIdentDesc ocfi, ncfi;
1085         struct buffer_head *dir_bh = NULL;
1086         int retval = -ENOENT;
1087         struct kernel_lb_addr tloc;
1088         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1089
1090         if (flags & ~RENAME_NOREPLACE)
1091                 return -EINVAL;
1092
1093         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1094         if (!ofi || IS_ERR(ofi)) {
1095                 if (IS_ERR(ofi))
1096                         retval = PTR_ERR(ofi);
1097                 goto end_rename;
1098         }
1099
1100         if (ofibh.sbh != ofibh.ebh)
1101                 brelse(ofibh.ebh);
1102
1103         brelse(ofibh.sbh);
1104         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1105         if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino)
1106                 goto end_rename;
1107
1108         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1109         if (IS_ERR(nfi)) {
1110                 retval = PTR_ERR(nfi);
1111                 goto end_rename;
1112         }
1113         if (nfi && !new_inode) {
1114                 if (nfibh.sbh != nfibh.ebh)
1115                         brelse(nfibh.ebh);
1116                 brelse(nfibh.sbh);
1117                 nfi = NULL;
1118         }
1119         if (S_ISDIR(old_inode->i_mode)) {
1120                 int offset = udf_ext0_offset(old_inode);
1121
1122                 if (new_inode) {
1123                         retval = -ENOTEMPTY;
1124                         if (!empty_dir(new_inode))
1125                                 goto end_rename;
1126                 }
1127                 retval = -EIO;
1128                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1129                         dir_fi = udf_get_fileident(
1130                                         old_iinfo->i_data -
1131                                           (old_iinfo->i_efe ?
1132                                            sizeof(struct extendedFileEntry) :
1133                                            sizeof(struct fileEntry)),
1134                                         old_inode->i_sb->s_blocksize, &offset);
1135                 } else {
1136                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1137                         if (!dir_bh)
1138                                 goto end_rename;
1139                         dir_fi = udf_get_fileident(dir_bh->b_data,
1140                                         old_inode->i_sb->s_blocksize, &offset);
1141                 }
1142                 if (!dir_fi)
1143                         goto end_rename;
1144                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1145                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1146                                 old_dir->i_ino)
1147                         goto end_rename;
1148         }
1149         if (!nfi) {
1150                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1151                                     &retval);
1152                 if (!nfi)
1153                         goto end_rename;
1154         }
1155
1156         /*
1157          * Like most other Unix systems, set the ctime for inodes on a
1158          * rename.
1159          */
1160         old_inode->i_ctime = current_time(old_inode);
1161         mark_inode_dirty(old_inode);
1162
1163         /*
1164          * ok, that's it
1165          */
1166         ncfi.fileVersionNum = ocfi.fileVersionNum;
1167         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1168         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1169         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1170
1171         /* The old fid may have moved - find it again */
1172         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1173         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1174
1175         if (new_inode) {
1176                 new_inode->i_ctime = current_time(new_inode);
1177                 inode_dec_link_count(new_inode);
1178         }
1179         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1180         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1181         mark_inode_dirty(old_dir);
1182         mark_inode_dirty(new_dir);
1183
1184         if (dir_fi) {
1185                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1186                 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1187                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1188                         mark_inode_dirty(old_inode);
1189                 else
1190                         mark_buffer_dirty_inode(dir_bh, old_inode);
1191
1192                 inode_dec_link_count(old_dir);
1193                 if (new_inode)
1194                         inode_dec_link_count(new_inode);
1195                 else {
1196                         inc_nlink(new_dir);
1197                         mark_inode_dirty(new_dir);
1198                 }
1199         }
1200
1201         if (ofi) {
1202                 if (ofibh.sbh != ofibh.ebh)
1203                         brelse(ofibh.ebh);
1204                 brelse(ofibh.sbh);
1205         }
1206
1207         retval = 0;
1208
1209 end_rename:
1210         brelse(dir_bh);
1211         if (nfi) {
1212                 if (nfibh.sbh != nfibh.ebh)
1213                         brelse(nfibh.ebh);
1214                 brelse(nfibh.sbh);
1215         }
1216
1217         return retval;
1218 }
1219
1220 static struct dentry *udf_get_parent(struct dentry *child)
1221 {
1222         struct kernel_lb_addr tloc;
1223         struct inode *inode = NULL;
1224         struct fileIdentDesc cfi;
1225         struct udf_fileident_bh fibh;
1226
1227         if (!udf_find_entry(d_inode(child), &dotdot_name, &fibh, &cfi))
1228                 return ERR_PTR(-EACCES);
1229
1230         if (fibh.sbh != fibh.ebh)
1231                 brelse(fibh.ebh);
1232         brelse(fibh.sbh);
1233
1234         tloc = lelb_to_cpu(cfi.icb.extLocation);
1235         inode = udf_iget(child->d_sb, &tloc);
1236         if (IS_ERR(inode))
1237                 return ERR_CAST(inode);
1238
1239         return d_obtain_alias(inode);
1240 }
1241
1242
1243 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1244                                         u16 partref, __u32 generation)
1245 {
1246         struct inode *inode;
1247         struct kernel_lb_addr loc;
1248
1249         if (block == 0)
1250                 return ERR_PTR(-ESTALE);
1251
1252         loc.logicalBlockNum = block;
1253         loc.partitionReferenceNum = partref;
1254         inode = udf_iget(sb, &loc);
1255
1256         if (IS_ERR(inode))
1257                 return ERR_CAST(inode);
1258
1259         if (generation && inode->i_generation != generation) {
1260                 iput(inode);
1261                 return ERR_PTR(-ESTALE);
1262         }
1263         return d_obtain_alias(inode);
1264 }
1265
1266 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1267                                        struct fid *fid, int fh_len, int fh_type)
1268 {
1269         if (fh_len < 3 ||
1270             (fh_type != FILEID_UDF_WITH_PARENT &&
1271              fh_type != FILEID_UDF_WITHOUT_PARENT))
1272                 return NULL;
1273
1274         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1275                         fid->udf.generation);
1276 }
1277
1278 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1279                                        struct fid *fid, int fh_len, int fh_type)
1280 {
1281         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1282                 return NULL;
1283
1284         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1285                                  fid->udf.parent_partref,
1286                                  fid->udf.parent_generation);
1287 }
1288 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1289                          struct inode *parent)
1290 {
1291         int len = *lenp;
1292         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1293         struct fid *fid = (struct fid *)fh;
1294         int type = FILEID_UDF_WITHOUT_PARENT;
1295
1296         if (parent && (len < 5)) {
1297                 *lenp = 5;
1298                 return FILEID_INVALID;
1299         } else if (len < 3) {
1300                 *lenp = 3;
1301                 return FILEID_INVALID;
1302         }
1303
1304         *lenp = 3;
1305         fid->udf.block = location.logicalBlockNum;
1306         fid->udf.partref = location.partitionReferenceNum;
1307         fid->udf.parent_partref = 0;
1308         fid->udf.generation = inode->i_generation;
1309
1310         if (parent) {
1311                 location = UDF_I(parent)->i_location;
1312                 fid->udf.parent_block = location.logicalBlockNum;
1313                 fid->udf.parent_partref = location.partitionReferenceNum;
1314                 fid->udf.parent_generation = inode->i_generation;
1315                 *lenp = 5;
1316                 type = FILEID_UDF_WITH_PARENT;
1317         }
1318
1319         return type;
1320 }
1321
1322 const struct export_operations udf_export_ops = {
1323         .encode_fh      = udf_encode_fh,
1324         .fh_to_dentry   = udf_fh_to_dentry,
1325         .fh_to_parent   = udf_fh_to_parent,
1326         .get_parent     = udf_get_parent,
1327 };
1328
1329 const struct inode_operations udf_dir_inode_operations = {
1330         .lookup                         = udf_lookup,
1331         .create                         = udf_create,
1332         .link                           = udf_link,
1333         .unlink                         = udf_unlink,
1334         .symlink                        = udf_symlink,
1335         .mkdir                          = udf_mkdir,
1336         .rmdir                          = udf_rmdir,
1337         .mknod                          = udf_mknod,
1338         .rename                         = udf_rename,
1339         .tmpfile                        = udf_tmpfile,
1340 };