fs/udf/namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2004 Ben Fennema
  14  *  (C) 1999-2000 Stelias Computing Inc
  15  *
  16  * HISTORY
  17  *
  18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  19  *  04/19/99 blf  link, mknod, symlink support
  20  */
  21
  22 #include "udfdecl.h"
  23
  24 #include "udf_i.h"
  25 #include "udf_sb.h"
  26 #include <linux/string.h>
  27 #include <linux/errno.h>
  28 #include <linux/mm.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched.h>
  31 #include <linux/crc-itu-t.h>
  32 #include <linux/exportfs.h>
  33 #include <linux/iversion.h>
  34
  35 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  36                             const unsigned char *name2)
  37 {
  38         if (len1 != len2)
  39                 return 0;
  40
  41         return !memcmp(name1, name2, len1);
  42 }
  43
  44 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  45                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  46                  uint8_t *impuse, uint8_t *fileident)
  47 {
  48         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  49         uint16_t crc;
  50         int offset;
  51         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  52         uint8_t lfi = cfi->lengthFileIdent;
  53         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  54                 sizeof(struct fileIdentDesc);
  55         int adinicb = 0;
  56
  57         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  58                 adinicb = 1;
  59
  60         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  61
  62         if (impuse) {
  63                 if (adinicb || (offset + liu < 0)) {
  64                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  65                 } else if (offset >= 0) {
  66                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  67                 } else {
  68                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  69                         memcpy(fibh->ebh->b_data, impuse - offset,
  70                                 liu + offset);
  71                 }
  72         }
  73
  74         offset += liu;
  75
  76         if (fileident) {
  77                 if (adinicb || (offset + lfi < 0)) {
  78                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  79                 } else if (offset >= 0) {
  80                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  81                 } else {
  82                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  83                                 -offset);
  84                         memcpy(fibh->ebh->b_data, fileident - offset,
  85                                 lfi + offset);
  86                 }
  87         }
  88
  89         offset += lfi;
  90
  91         if (adinicb || (offset + padlen < 0)) {
  92                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  93         } else if (offset >= 0) {
  94                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  95         } else {
  96                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  97                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  98         }
  99
 100         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
 101                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 102
 103         if (fibh->sbh == fibh->ebh) {
 104                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 105                               crclen + sizeof(struct tag) -
 106                               sizeof(struct fileIdentDesc));
 107         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 108                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 109                                         sizeof(struct fileIdentDesc) +
 110                                         fibh->soffset,
 111                               crclen + sizeof(struct tag) -
 112                                         sizeof(struct fileIdentDesc));
 113         } else {
 114                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 115                               -fibh->soffset - sizeof(struct fileIdentDesc));
 116                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 117         }
 118
 119         cfi->descTag.descCRC = cpu_to_le16(crc);
 120         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 121         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 122
 123         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 124                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 125                         sizeof(struct fileIdentDesc));
 126         } else {
 127                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 128                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 129                        sizeof(struct fileIdentDesc) + fibh->soffset);
 130         }
 131
 132         if (adinicb) {
 133                 mark_inode_dirty(inode);
 134         } else {
 135                 if (fibh->sbh != fibh->ebh)
 136                         mark_buffer_dirty_inode(fibh->ebh, inode);
 137                 mark_buffer_dirty_inode(fibh->sbh, inode);
 138         }
 139         inode_inc_iversion(inode);
 140
 141         return 0;
 142 }
 143
 144 /**
 145  * udf_find_entry - find entry in given directory.
 146  *
 147  * @dir:        directory inode to search in
 148  * @child:      qstr of the name
 149  * @fibh:       buffer head / inode with file identifier descriptor we found
 150  * @cfi:        found file identifier descriptor with given name
 151  *
 152  * This function searches in the directory @dir for a file name @child. When
 153  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 154  * directories) containing the file identifier descriptor (FID). In that case
 155  * the function returns pointer to the FID in the buffer or inode - but note
 156  * that FID may be split among two buffers (blocks) so accessing it via that
 157  * pointer isn't easily possible. This pointer can be used only as an iterator
 158  * for other directory manipulation functions. For inspection of the FID @cfi
 159  * can be used - the found FID is copied there.
 160  *
 161  * Returns pointer to FID, NULL when nothing found, or error code.
 162  */
 163 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 164                                             const struct qstr *child,
 165                                             struct udf_fileident_bh *fibh,
 166                                             struct fileIdentDesc *cfi)
 167 {
 168         struct fileIdentDesc *fi = NULL;
 169         loff_t f_pos;
 170         udf_pblk_t block;
 171         int flen;
 172         unsigned char *fname = NULL, *copy_name = NULL;
 173         unsigned char *nameptr;
 174         uint8_t lfi;
 175         uint16_t liu;
 176         loff_t size;
 177         struct kernel_lb_addr eloc;
 178         uint32_t elen;
 179         sector_t offset;
 180         struct extent_position epos = {};
 181         struct udf_inode_info *dinfo = UDF_I(dir);
 182         int isdotdot = child->len == 2 &&
 183                 child->name[0] == '.' && child->name[1] == '.';
 184         struct super_block *sb = dir->i_sb;
 185
 186         size = udf_ext0_offset(dir) + dir->i_size;
 187         f_pos = udf_ext0_offset(dir);
 188
 189         fibh->sbh = fibh->ebh = NULL;
 190         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 191         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 192                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 193                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 194                         fi = ERR_PTR(-EIO);
 195                         goto out_err;
 196                 }
 197
 198                 block = udf_get_lb_pblock(sb, &eloc, offset);
 199                 if ((++offset << sb->s_blocksize_bits) < elen) {
 200                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 201                                 epos.offset -= sizeof(struct short_ad);
 202                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 203                                 epos.offset -= sizeof(struct long_ad);
 204                 } else
 205                         offset = 0;
 206
 207                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 208                 if (!fibh->sbh) {
 209                         fi = ERR_PTR(-EIO);
 210                         goto out_err;
 211                 }
 212         }
 213
 214         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 215         if (!fname) {
 216                 fi = ERR_PTR(-ENOMEM);
 217                 goto out_err;
 218         }
 219
 220         while (f_pos < size) {
 221                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 222                                         &elen, &offset);
 223                 if (!fi) {
 224                         fi = ERR_PTR(-EIO);
 225                         goto out_err;
 226                 }
 227
 228                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 229                 lfi = cfi->lengthFileIdent;
 230
 231                 if (fibh->sbh == fibh->ebh) {
 232                         nameptr = fi->fileIdent + liu;
 233                 } else {
 234                         int poffset;    /* Unpaded ending offset */
 235
 236                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 237                                         liu + lfi;
 238
 239                         if (poffset >= lfi)
 240                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 241                                                       poffset - lfi);
 242                         else {
 243                                 if (!copy_name) {
 244                                         copy_name = kmalloc(UDF_NAME_LEN_CS0,
 245                                                             GFP_NOFS);
 246                                         if (!copy_name) {
 247                                                 fi = ERR_PTR(-ENOMEM);
 248                                                 goto out_err;
 249                                         }
 250                                 }
 251                                 nameptr = copy_name;
 252                                 memcpy(nameptr, fi->fileIdent + liu,
 253                                         lfi - poffset);
 254                                 memcpy(nameptr + lfi - poffset,
 255                                         fibh->ebh->b_data, poffset);
 256                         }
 257                 }
 258
 259                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 260                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 261                                 continue;
 262                 }
 263
 264                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 265                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 266                                 continue;
 267                 }
 268
 269                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 270                     isdotdot)
 271                         goto out_ok;
 272
 273                 if (!lfi)
 274                         continue;
 275
 276                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 277                 if (flen < 0) {
 278                         fi = ERR_PTR(flen);
 279                         goto out_err;
 280                 }
 281
 282                 if (udf_match(flen, fname, child->len, child->name))
 283                         goto out_ok;
 284         }
 285
 286         fi = NULL;
 287 out_err:
 288         if (fibh->sbh != fibh->ebh)
 289                 brelse(fibh->ebh);
 290         brelse(fibh->sbh);
 291 out_ok:
 292         brelse(epos.bh);
 293         kfree(fname);
 294         kfree(copy_name);
 295
 296         return fi;
 297 }
 298
 299 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 300                                  unsigned int flags)
 301 {
 302         struct inode *inode = NULL;
 303         struct fileIdentDesc cfi;
 304         struct udf_fileident_bh fibh;
 305         struct fileIdentDesc *fi;
 306
 307         if (dentry->d_name.len > UDF_NAME_LEN)
 308                 return ERR_PTR(-ENAMETOOLONG);
 309
 310         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 311         if (IS_ERR(fi))
 312                 return ERR_CAST(fi);
 313
 314         if (fi) {
 315                 struct kernel_lb_addr loc;
 316
 317                 if (fibh.sbh != fibh.ebh)
 318                         brelse(fibh.ebh);
 319                 brelse(fibh.sbh);
 320
 321                 loc = lelb_to_cpu(cfi.icb.extLocation);
 322                 inode = udf_iget(dir->i_sb, &loc);
 323                 if (IS_ERR(inode))
 324                         return ERR_CAST(inode);
 325         }
 326
 327         return d_splice_alias(inode, dentry);
 328 }
 329
 330 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 331                                            struct dentry *dentry,
 332                                            struct udf_fileident_bh *fibh,
 333                                            struct fileIdentDesc *cfi, int *err)
 334 {
 335         struct super_block *sb = dir->i_sb;
 336         struct fileIdentDesc *fi = NULL;
 337         unsigned char *name = NULL;
 338         int namelen;
 339         loff_t f_pos;
 340         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 341         int nfidlen;
 342         udf_pblk_t block;
 343         struct kernel_lb_addr eloc;
 344         uint32_t elen = 0;
 345         sector_t offset;
 346         struct extent_position epos = {};
 347         struct udf_inode_info *dinfo;
 348
 349         fibh->sbh = fibh->ebh = NULL;
 350         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 351         if (!name) {
 352                 *err = -ENOMEM;
 353                 goto out_err;
 354         }
 355
 356         if (dentry) {
 357                 if (!dentry->d_name.len) {
 358                         *err = -EINVAL;
 359                         goto out_err;
 360                 }
 361                 namelen = udf_put_filename(sb, dentry->d_name.name,
 362                                            dentry->d_name.len,
 363                                            name, UDF_NAME_LEN_CS0);
 364                 if (!namelen) {
 365                         *err = -ENAMETOOLONG;
 366                         goto out_err;
 367                 }
 368         } else {
 369                 namelen = 0;
 370         }
 371
 372         nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 373
 374         f_pos = udf_ext0_offset(dir);
 375
 376         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 377         dinfo = UDF_I(dir);
 378         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 379                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 380                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 381                         block = udf_get_lb_pblock(dir->i_sb,
 382                                         &dinfo->i_location, 0);
 383                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 384                         goto add;
 385                 }
 386                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 387                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 388                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 389                                 epos.offset -= sizeof(struct short_ad);
 390                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 391                                 epos.offset -= sizeof(struct long_ad);
 392                 } else
 393                         offset = 0;
 394
 395                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 396                 if (!fibh->sbh) {
 397                         *err = -EIO;
 398                         goto out_err;
 399                 }
 400
 401                 block = dinfo->i_location.logicalBlockNum;
 402         }
 403
 404         while (f_pos < size) {
 405                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 406                                         &elen, &offset);
 407
 408                 if (!fi) {
 409                         *err = -EIO;
 410                         goto out_err;
 411                 }
 412
 413                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 414                         if (udf_dir_entry_len(cfi) == nfidlen) {
 415                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 416                                 cfi->fileVersionNum = cpu_to_le16(1);
 417                                 cfi->fileCharacteristics = 0;
 418                                 cfi->lengthFileIdent = namelen;
 419                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 420                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 421                                                   name))
 422                                         goto out_ok;
 423                                 else {
 424                                         *err = -EIO;
 425                                         goto out_err;
 426                                 }
 427                         }
 428                 }
 429         }
 430
 431 add:
 432         f_pos += nfidlen;
 433
 434         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 435             sb->s_blocksize - fibh->eoffset < nfidlen) {
 436                 brelse(epos.bh);
 437                 epos.bh = NULL;
 438                 fibh->soffset -= udf_ext0_offset(dir);
 439                 fibh->eoffset -= udf_ext0_offset(dir);
 440                 f_pos -= udf_ext0_offset(dir);
 441                 if (fibh->sbh != fibh->ebh)
 442                         brelse(fibh->ebh);
 443                 brelse(fibh->sbh);
 444                 fibh->sbh = fibh->ebh =
 445                                 udf_expand_dir_adinicb(dir, &block, err);
 446                 if (!fibh->sbh)
 447                         goto out_err;
 448                 epos.block = dinfo->i_location;
 449                 epos.offset = udf_file_entry_alloc_offset(dir);
 450                 /* Load extent udf_expand_dir_adinicb() has created */
 451                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 452         }
 453
 454         /* Entry fits into current block? */
 455         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 456                 fibh->soffset = fibh->eoffset;
 457                 fibh->eoffset += nfidlen;
 458                 if (fibh->sbh != fibh->ebh) {
 459                         brelse(fibh->sbh);
 460                         fibh->sbh = fibh->ebh;
 461                 }
 462
 463                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 464                         block = dinfo->i_location.logicalBlockNum;
 465                         fi = (struct fileIdentDesc *)
 466                                         (dinfo->i_data + fibh->soffset -
 467                                          udf_ext0_offset(dir) +
 468                                          dinfo->i_lenEAttr);
 469                 } else {
 470                         block = eloc.logicalBlockNum +
 471                                         ((elen - 1) >>
 472                                                 dir->i_sb->s_blocksize_bits);
 473                         fi = (struct fileIdentDesc *)
 474                                 (fibh->sbh->b_data + fibh->soffset);
 475                 }
 476         } else {
 477                 /* Round up last extent in the file */
 478                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 479                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 480                         epos.offset -= sizeof(struct short_ad);
 481                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 482                         epos.offset -= sizeof(struct long_ad);
 483                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 484                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 485                                         - 1) & ~(sb->s_blocksize - 1);
 486
 487                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 488                 fibh->eoffset += nfidlen - sb->s_blocksize;
 489                 if (fibh->sbh != fibh->ebh) {
 490                         brelse(fibh->sbh);
 491                         fibh->sbh = fibh->ebh;
 492                 }
 493
 494                 block = eloc.logicalBlockNum + ((elen - 1) >>
 495                                                 dir->i_sb->s_blocksize_bits);
 496                 fibh->ebh = udf_bread(dir,
 497                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 498                 if (!fibh->ebh)
 499                         goto out_err;
 500                 /* Extents could have been merged, invalidate our position */
 501                 brelse(epos.bh);
 502                 epos.bh = NULL;
 503                 epos.block = dinfo->i_location;
 504                 epos.offset = udf_file_entry_alloc_offset(dir);
 505
 506                 if (!fibh->soffset) {
 507                         /* Find the freshly allocated block */
 508                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 509                                 (EXT_RECORDED_ALLOCATED >> 30))
 510                                 ;
 511                         block = eloc.logicalBlockNum + ((elen - 1) >>
 512                                         dir->i_sb->s_blocksize_bits);
 513                         brelse(fibh->sbh);
 514                         fibh->sbh = fibh->ebh;
 515                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 516                 } else {
 517                         fi = (struct fileIdentDesc *)
 518                                 (fibh->sbh->b_data + sb->s_blocksize +
 519                                         fibh->soffset);
 520                 }
 521         }
 522
 523         memset(cfi, 0, sizeof(struct fileIdentDesc));
 524         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 525                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 526                             sizeof(struct tag));
 527         else
 528                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 529                             sizeof(struct tag));
 530         cfi->fileVersionNum = cpu_to_le16(1);
 531         cfi->lengthFileIdent = namelen;
 532         cfi->lengthOfImpUse = cpu_to_le16(0);
 533         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 534                 dir->i_size += nfidlen;
 535                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 536                         dinfo->i_lenAlloc += nfidlen;
 537                 else {
 538                         /* Find the last extent and truncate it to proper size */
 539                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 540                                 (EXT_RECORDED_ALLOCATED >> 30))
 541                                 ;
 542                         elen -= dinfo->i_lenExtents - dir->i_size;
 543                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 544                                 epos.offset -= sizeof(struct short_ad);
 545                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 546                                 epos.offset -= sizeof(struct long_ad);
 547                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 548                         dinfo->i_lenExtents = dir->i_size;
 549                 }
 550
 551                 mark_inode_dirty(dir);
 552                 goto out_ok;
 553         } else {
 554                 *err = -EIO;
 555                 goto out_err;
 556         }
 557
 558 out_err:
 559         fi = NULL;
 560         if (fibh->sbh != fibh->ebh)
 561                 brelse(fibh->ebh);
 562         brelse(fibh->sbh);
 563 out_ok:
 564         brelse(epos.bh);
 565         kfree(name);
 566         return fi;
 567 }
 568
 569 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 570                             struct udf_fileident_bh *fibh,
 571                             struct fileIdentDesc *cfi)
 572 {
 573         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 574
 575         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 576                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 577
 578         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 579 }
 580
 581 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 582 {
 583         struct udf_inode_info *iinfo = UDF_I(inode);
 584         struct inode *dir = d_inode(dentry->d_parent);
 585         struct udf_fileident_bh fibh;
 586         struct fileIdentDesc cfi, *fi;
 587         int err;
 588
 589         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 590         if (unlikely(!fi)) {
 591                 inode_dec_link_count(inode);
 592                 discard_new_inode(inode);
 593                 return err;
 594         }
 595         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 596         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 597         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 598                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 599         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 600         dir->i_ctime = dir->i_mtime = current_time(dir);
 601         mark_inode_dirty(dir);
 602         if (fibh.sbh != fibh.ebh)
 603                 brelse(fibh.ebh);
 604         brelse(fibh.sbh);
 605         d_instantiate_new(dentry, inode);
 606
 607         return 0;
 608 }
 609
 610 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 611                       bool excl)
 612 {
 613         struct inode *inode = udf_new_inode(dir, mode);
 614
 615         if (IS_ERR(inode))
 616                 return PTR_ERR(inode);
 617
 618         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 619                 inode->i_data.a_ops = &udf_adinicb_aops;
 620         else
 621                 inode->i_data.a_ops = &udf_aops;
 622         inode->i_op = &udf_file_inode_operations;
 623         inode->i_fop = &udf_file_operations;
 624         mark_inode_dirty(inode);
 625
 626         return udf_add_nondir(dentry, inode);
 627 }
 628
 629 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, 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(dentry, inode);
 644         unlock_new_inode(inode);
 645         return 0;
 646 }
 647
 648 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 649                      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 inode *dir, struct dentry *dentry, umode_t mode)
 665 {
 666         struct inode *inode;
 667         struct udf_fileident_bh fibh;
 668         struct fileIdentDesc cfi, *fi;
 669         int err;
 670         struct udf_inode_info *dinfo = UDF_I(dir);
 671         struct udf_inode_info *iinfo;
 672
 673         inode = udf_new_inode(dir, S_IFDIR | mode);
 674         if (IS_ERR(inode))
 675                 return PTR_ERR(inode);
 676
 677         iinfo = UDF_I(inode);
 678         inode->i_op = &udf_dir_inode_operations;
 679         inode->i_fop = &udf_dir_operations;
 680         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 681         if (!fi) {
 682                 inode_dec_link_count(inode);
 683                 discard_new_inode(inode);
 684                 goto out;
 685         }
 686         set_nlink(inode, 2);
 687         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 688         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 689         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 690                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 691         cfi.fileCharacteristics =
 692                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 693         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 694         brelse(fibh.sbh);
 695         mark_inode_dirty(inode);
 696
 697         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 698         if (!fi) {
 699                 clear_nlink(inode);
 700                 mark_inode_dirty(inode);
 701                 discard_new_inode(inode);
 702                 goto out;
 703         }
 704         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 705         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 706         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 707                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 708         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 709         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 710         inc_nlink(dir);
 711         dir->i_ctime = dir->i_mtime = current_time(dir);
 712         mark_inode_dirty(dir);
 713         d_instantiate_new(dentry, inode);
 714         if (fibh.sbh != fibh.ebh)
 715                 brelse(fibh.ebh);
 716         brelse(fibh.sbh);
 717         err = 0;
 718
 719 out:
 720         return err;
 721 }
 722
 723 static int empty_dir(struct inode *dir)
 724 {
 725         struct fileIdentDesc *fi, cfi;
 726         struct udf_fileident_bh fibh;
 727         loff_t f_pos;
 728         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 729         udf_pblk_t block;
 730         struct kernel_lb_addr eloc;
 731         uint32_t elen;
 732         sector_t offset;
 733         struct extent_position epos = {};
 734         struct udf_inode_info *dinfo = UDF_I(dir);
 735
 736         f_pos = udf_ext0_offset(dir);
 737         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 738
 739         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 740                 fibh.sbh = fibh.ebh = NULL;
 741         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 742                               &epos, &eloc, &elen, &offset) ==
 743                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 744                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 745                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 746                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 747                                 epos.offset -= sizeof(struct short_ad);
 748                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 749                                 epos.offset -= sizeof(struct long_ad);
 750                 } else
 751                         offset = 0;
 752
 753                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 754                 if (!fibh.sbh) {
 755                         brelse(epos.bh);
 756                         return 0;
 757                 }
 758         } else {
 759                 brelse(epos.bh);
 760                 return 0;
 761         }
 762
 763         while (f_pos < size) {
 764                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 765                                         &elen, &offset);
 766                 if (!fi) {
 767                         if (fibh.sbh != fibh.ebh)
 768                                 brelse(fibh.ebh);
 769                         brelse(fibh.sbh);
 770                         brelse(epos.bh);
 771                         return 0;
 772                 }
 773
 774                 if (cfi.lengthFileIdent &&
 775                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 776                         if (fibh.sbh != fibh.ebh)
 777                                 brelse(fibh.ebh);
 778                         brelse(fibh.sbh);
 779                         brelse(epos.bh);
 780                         return 0;
 781                 }
 782         }
 783
 784         if (fibh.sbh != fibh.ebh)
 785                 brelse(fibh.ebh);
 786         brelse(fibh.sbh);
 787         brelse(epos.bh);
 788
 789         return 1;
 790 }
 791
 792 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 793 {
 794         int retval;
 795         struct inode *inode = d_inode(dentry);
 796         struct udf_fileident_bh fibh;
 797         struct fileIdentDesc *fi, cfi;
 798         struct kernel_lb_addr tloc;
 799
 800         retval = -ENOENT;
 801         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 802         if (IS_ERR_OR_NULL(fi)) {
 803                 if (fi)
 804                         retval = PTR_ERR(fi);
 805                 goto out;
 806         }
 807
 808         retval = -EIO;
 809         tloc = lelb_to_cpu(cfi.icb.extLocation);
 810         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 811                 goto end_rmdir;
 812         retval = -ENOTEMPTY;
 813         if (!empty_dir(inode))
 814                 goto end_rmdir;
 815         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 816         if (retval)
 817                 goto end_rmdir;
 818         if (inode->i_nlink != 2)
 819                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 820                          inode->i_nlink);
 821         clear_nlink(inode);
 822         inode->i_size = 0;
 823         inode_dec_link_count(dir);
 824         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 825                                                 current_time(inode);
 826         mark_inode_dirty(dir);
 827
 828 end_rmdir:
 829         if (fibh.sbh != fibh.ebh)
 830                 brelse(fibh.ebh);
 831         brelse(fibh.sbh);
 832
 833 out:
 834         return retval;
 835 }
 836
 837 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 838 {
 839         int retval;
 840         struct inode *inode = d_inode(dentry);
 841         struct udf_fileident_bh fibh;
 842         struct fileIdentDesc *fi;
 843         struct fileIdentDesc cfi;
 844         struct kernel_lb_addr tloc;
 845
 846         retval = -ENOENT;
 847         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 848
 849         if (IS_ERR_OR_NULL(fi)) {
 850                 if (fi)
 851                         retval = PTR_ERR(fi);
 852                 goto out;
 853         }
 854
 855         retval = -EIO;
 856         tloc = lelb_to_cpu(cfi.icb.extLocation);
 857         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 858                 goto end_unlink;
 859
 860         if (!inode->i_nlink) {
 861                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 862                           inode->i_ino, inode->i_nlink);
 863                 set_nlink(inode, 1);
 864         }
 865         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 866         if (retval)
 867                 goto end_unlink;
 868         dir->i_ctime = dir->i_mtime = current_time(dir);
 869         mark_inode_dirty(dir);
 870         inode_dec_link_count(inode);
 871         inode->i_ctime = dir->i_ctime;
 872         retval = 0;
 873
 874 end_unlink:
 875         if (fibh.sbh != fibh.ebh)
 876                 brelse(fibh.ebh);
 877         brelse(fibh.sbh);
 878
 879 out:
 880         return retval;
 881 }
 882
 883 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 884                        const char *symname)
 885 {
 886         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 887         struct pathComponent *pc;
 888         const char *compstart;
 889         struct extent_position epos = {};
 890         int eoffset, elen = 0;
 891         uint8_t *ea;
 892         int err;
 893         udf_pblk_t block;
 894         unsigned char *name = NULL;
 895         int namelen;
 896         struct udf_inode_info *iinfo;
 897         struct super_block *sb = dir->i_sb;
 898
 899         if (IS_ERR(inode))
 900                 return PTR_ERR(inode);
 901
 902         iinfo = UDF_I(inode);
 903         down_write(&iinfo->i_data_sem);
 904         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 905         if (!name) {
 906                 err = -ENOMEM;
 907                 goto out_no_entry;
 908         }
 909
 910         inode->i_data.a_ops = &udf_symlink_aops;
 911         inode->i_op = &udf_symlink_inode_operations;
 912         inode_nohighmem(inode);
 913
 914         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 915                 struct kernel_lb_addr eloc;
 916                 uint32_t bsize;
 917
 918                 block = udf_new_block(sb, inode,
 919                                 iinfo->i_location.partitionReferenceNum,
 920                                 iinfo->i_location.logicalBlockNum, &err);
 921                 if (!block)
 922                         goto out_no_entry;
 923                 epos.block = iinfo->i_location;
 924                 epos.offset = udf_file_entry_alloc_offset(inode);
 925                 epos.bh = NULL;
 926                 eloc.logicalBlockNum = block;
 927                 eloc.partitionReferenceNum =
 928                                 iinfo->i_location.partitionReferenceNum;
 929                 bsize = sb->s_blocksize;
 930                 iinfo->i_lenExtents = bsize;
 931                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 932                 brelse(epos.bh);
 933
 934                 block = udf_get_pblock(sb, block,
 935                                 iinfo->i_location.partitionReferenceNum,
 936                                 0);
 937                 epos.bh = udf_tgetblk(sb, block);
 938                 if (unlikely(!epos.bh)) {
 939                         err = -ENOMEM;
 940                         goto out_no_entry;
 941                 }
 942                 lock_buffer(epos.bh);
 943                 memset(epos.bh->b_data, 0x00, bsize);
 944                 set_buffer_uptodate(epos.bh);
 945                 unlock_buffer(epos.bh);
 946                 mark_buffer_dirty_inode(epos.bh, inode);
 947                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 948         } else
 949                 ea = iinfo->i_data + iinfo->i_lenEAttr;
 950
 951         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 952         pc = (struct pathComponent *)ea;
 953
 954         if (*symname == '/') {
 955                 do {
 956                         symname++;
 957                 } while (*symname == '/');
 958
 959                 pc->componentType = 1;
 960                 pc->lengthComponentIdent = 0;
 961                 pc->componentFileVersionNum = 0;
 962                 elen += sizeof(struct pathComponent);
 963         }
 964
 965         err = -ENAMETOOLONG;
 966
 967         while (*symname) {
 968                 if (elen + sizeof(struct pathComponent) > eoffset)
 969                         goto out_no_entry;
 970
 971                 pc = (struct pathComponent *)(ea + elen);
 972
 973                 compstart = symname;
 974
 975                 do {
 976                         symname++;
 977                 } while (*symname && *symname != '/');
 978
 979                 pc->componentType = 5;
 980                 pc->lengthComponentIdent = 0;
 981                 pc->componentFileVersionNum = 0;
 982                 if (compstart[0] == '.') {
 983                         if ((symname - compstart) == 1)
 984                                 pc->componentType = 4;
 985                         else if ((symname - compstart) == 2 &&
 986                                         compstart[1] == '.')
 987                                 pc->componentType = 3;
 988                 }
 989
 990                 if (pc->componentType == 5) {
 991                         namelen = udf_put_filename(sb, compstart,
 992                                                    symname - compstart,
 993                                                    name, UDF_NAME_LEN_CS0);
 994                         if (!namelen)
 995                                 goto out_no_entry;
 996
 997                         if (elen + sizeof(struct pathComponent) + namelen >
 998                                         eoffset)
 999                                 goto out_no_entry;
1000                         else
1001                                 pc->lengthComponentIdent = namelen;
1002
1003                         memcpy(pc->componentIdent, name, namelen);
1004                 }
1005
1006                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1007
1008                 if (*symname) {
1009                         do {
1010                                 symname++;
1011                         } while (*symname == '/');
1012                 }
1013         }
1014
1015         brelse(epos.bh);
1016         inode->i_size = elen;
1017         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1018                 iinfo->i_lenAlloc = inode->i_size;
1019         else
1020                 udf_truncate_tail_extent(inode);
1021         mark_inode_dirty(inode);
1022         up_write(&iinfo->i_data_sem);
1023
1024         err = udf_add_nondir(dentry, inode);
1025 out:
1026         kfree(name);
1027         return err;
1028
1029 out_no_entry:
1030         up_write(&iinfo->i_data_sem);
1031         inode_dec_link_count(inode);
1032         discard_new_inode(inode);
1033         goto out;
1034 }
1035
1036 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1037                     struct dentry *dentry)
1038 {
1039         struct inode *inode = d_inode(old_dentry);
1040         struct udf_fileident_bh fibh;
1041         struct fileIdentDesc cfi, *fi;
1042         int err;
1043
1044         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1045         if (!fi) {
1046                 return err;
1047         }
1048         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1049         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1050         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1051                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1052                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1053         }
1054         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1055         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1056                 mark_inode_dirty(dir);
1057
1058         if (fibh.sbh != fibh.ebh)
1059                 brelse(fibh.ebh);
1060         brelse(fibh.sbh);
1061         inc_nlink(inode);
1062         inode->i_ctime = current_time(inode);
1063         mark_inode_dirty(inode);
1064         dir->i_ctime = dir->i_mtime = current_time(dir);
1065         mark_inode_dirty(dir);
1066         ihold(inode);
1067         d_instantiate(dentry, inode);
1068
1069         return 0;
1070 }
1071
1072 /* Anybody can rename anything with this: the permission checks are left to the
1073  * higher-level routines.
1074  */
1075 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1076                       struct inode *new_dir, struct dentry *new_dentry,
1077                       unsigned int flags)
1078 {
1079         struct inode *old_inode = d_inode(old_dentry);
1080         struct inode *new_inode = d_inode(new_dentry);
1081         struct udf_fileident_bh ofibh, nfibh;
1082         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1083         struct fileIdentDesc ocfi, ncfi;
1084         struct buffer_head *dir_bh = NULL;
1085         int retval = -ENOENT;
1086         struct kernel_lb_addr tloc;
1087         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1088
1089         if (flags & ~RENAME_NOREPLACE)
1090                 return -EINVAL;
1091
1092         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1093         if (!ofi || IS_ERR(ofi)) {
1094                 if (IS_ERR(ofi))
1095                         retval = PTR_ERR(ofi);
1096                 goto end_rename;
1097         }
1098
1099         if (ofibh.sbh != ofibh.ebh)
1100                 brelse(ofibh.ebh);
1101
1102         brelse(ofibh.sbh);
1103         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1104         if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino)
1105                 goto end_rename;
1106
1107         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1108         if (IS_ERR(nfi)) {
1109                 retval = PTR_ERR(nfi);
1110                 goto end_rename;
1111         }
1112         if (nfi && !new_inode) {
1113                 if (nfibh.sbh != nfibh.ebh)
1114                         brelse(nfibh.ebh);
1115                 brelse(nfibh.sbh);
1116                 nfi = NULL;
1117         }
1118         if (S_ISDIR(old_inode->i_mode)) {
1119                 int offset = udf_ext0_offset(old_inode);
1120
1121                 if (new_inode) {
1122                         retval = -ENOTEMPTY;
1123                         if (!empty_dir(new_inode))
1124                                 goto end_rename;
1125                 }
1126                 retval = -EIO;
1127                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1128                         dir_fi = udf_get_fileident(
1129                                         old_iinfo->i_data -
1130                                           (old_iinfo->i_efe ?
1131                                            sizeof(struct extendedFileEntry) :
1132                                            sizeof(struct fileEntry)),
1133                                         old_inode->i_sb->s_blocksize, &offset);
1134                 } else {
1135                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1136                         if (!dir_bh)
1137                                 goto end_rename;
1138                         dir_fi = udf_get_fileident(dir_bh->b_data,
1139                                         old_inode->i_sb->s_blocksize, &offset);
1140                 }
1141                 if (!dir_fi)
1142                         goto end_rename;
1143                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1144                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1145                                 old_dir->i_ino)
1146                         goto end_rename;
1147         }
1148         if (!nfi) {
1149                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1150                                     &retval);
1151                 if (!nfi)
1152                         goto end_rename;
1153         }
1154
1155         /*
1156          * Like most other Unix systems, set the ctime for inodes on a
1157          * rename.
1158          */
1159         old_inode->i_ctime = current_time(old_inode);
1160         mark_inode_dirty(old_inode);
1161
1162         /*
1163          * ok, that's it
1164          */
1165         ncfi.fileVersionNum = ocfi.fileVersionNum;
1166         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1167         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1168         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1169
1170         /* The old fid may have moved - find it again */
1171         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1172         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1173
1174         if (new_inode) {
1175                 new_inode->i_ctime = current_time(new_inode);
1176                 inode_dec_link_count(new_inode);
1177         }
1178         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1179         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1180         mark_inode_dirty(old_dir);
1181         mark_inode_dirty(new_dir);
1182
1183         if (dir_fi) {
1184                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1185                 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1186                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1187                         mark_inode_dirty(old_inode);
1188                 else
1189                         mark_buffer_dirty_inode(dir_bh, old_inode);
1190
1191                 inode_dec_link_count(old_dir);
1192                 if (new_inode)
1193                         inode_dec_link_count(new_inode);
1194                 else {
1195                         inc_nlink(new_dir);
1196                         mark_inode_dirty(new_dir);
1197                 }
1198         }
1199
1200         if (ofi) {
1201                 if (ofibh.sbh != ofibh.ebh)
1202                         brelse(ofibh.ebh);
1203                 brelse(ofibh.sbh);
1204         }
1205
1206         retval = 0;
1207
1208 end_rename:
1209         brelse(dir_bh);
1210         if (nfi) {
1211                 if (nfibh.sbh != nfibh.ebh)
1212                         brelse(nfibh.ebh);
1213                 brelse(nfibh.sbh);
1214         }
1215
1216         return retval;
1217 }
1218
1219 static struct dentry *udf_get_parent(struct dentry *child)
1220 {
1221         struct kernel_lb_addr tloc;
1222         struct inode *inode = NULL;
1223         struct qstr dotdot = QSTR_INIT("..", 2);
1224         struct fileIdentDesc cfi;
1225         struct udf_fileident_bh fibh;
1226
1227         if (!udf_find_entry(d_inode(child), &dotdot, &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 };