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