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