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                                  struct nameidata *nd)
 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 (!inode) {
 274                         return ERR_PTR(-EACCES);
 275                 }
 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 (!inode) {
 289                         return ERR_PTR(-EACCES);
 290                 }
 291         }
 292
 293         return d_splice_alias(inode, dentry);
 294 }
 295
 296 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 297                                            struct dentry *dentry,
 298                                            struct udf_fileident_bh *fibh,
 299                                            struct fileIdentDesc *cfi, int *err)
 300 {
 301         struct super_block *sb = dir->i_sb;
 302         struct fileIdentDesc *fi = NULL;
 303         unsigned char *name = NULL;
 304         int namelen;
 305         loff_t f_pos;
 306         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 307         int nfidlen;
 308         uint8_t lfi;
 309         uint16_t liu;
 310         int block;
 311         struct kernel_lb_addr eloc;
 312         uint32_t elen = 0;
 313         sector_t offset;
 314         struct extent_position epos = {};
 315         struct udf_inode_info *dinfo;
 316
 317         fibh->sbh = fibh->ebh = NULL;
 318         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 319         if (!name) {
 320                 *err = -ENOMEM;
 321                 goto out_err;
 322         }
 323
 324         if (dentry) {
 325                 if (!dentry->d_name.len) {
 326                         *err = -EINVAL;
 327                         goto out_err;
 328                 }
 329                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
 330                                                  dentry->d_name.len);
 331                 if (!namelen) {
 332                         *err = -ENAMETOOLONG;
 333                         goto out_err;
 334                 }
 335         } else {
 336                 namelen = 0;
 337         }
 338
 339         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 340
 341         f_pos = udf_ext0_offset(dir);
 342
 343         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 344         dinfo = UDF_I(dir);
 345         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 346                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 347                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 348                         block = udf_get_lb_pblock(dir->i_sb,
 349                                         &dinfo->i_location, 0);
 350                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 351                         goto add;
 352                 }
 353                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 354                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 355                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 356                                 epos.offset -= sizeof(struct short_ad);
 357                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 358                                 epos.offset -= sizeof(struct long_ad);
 359                 } else
 360                         offset = 0;
 361
 362                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 363                 if (!fibh->sbh) {
 364                         *err = -EIO;
 365                         goto out_err;
 366                 }
 367
 368                 block = dinfo->i_location.logicalBlockNum;
 369         }
 370
 371         while (f_pos < size) {
 372                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 373                                         &elen, &offset);
 374
 375                 if (!fi) {
 376                         *err = -EIO;
 377                         goto out_err;
 378                 }
 379
 380                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 381                 lfi = cfi->lengthFileIdent;
 382
 383                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 384                         if (((sizeof(struct fileIdentDesc) +
 385                                         liu + lfi + 3) & ~3) == nfidlen) {
 386                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 387                                 cfi->fileVersionNum = cpu_to_le16(1);
 388                                 cfi->fileCharacteristics = 0;
 389                                 cfi->lengthFileIdent = namelen;
 390                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 391                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 392                                                   name))
 393                                         goto out_ok;
 394                                 else {
 395                                         *err = -EIO;
 396                                         goto out_err;
 397                                 }
 398                         }
 399                 }
 400         }
 401
 402 add:
 403         f_pos += nfidlen;
 404
 405         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 406             sb->s_blocksize - fibh->eoffset < nfidlen) {
 407                 brelse(epos.bh);
 408                 epos.bh = NULL;
 409                 fibh->soffset -= udf_ext0_offset(dir);
 410                 fibh->eoffset -= udf_ext0_offset(dir);
 411                 f_pos -= udf_ext0_offset(dir);
 412                 if (fibh->sbh != fibh->ebh)
 413                         brelse(fibh->ebh);
 414                 brelse(fibh->sbh);
 415                 fibh->sbh = fibh->ebh =
 416                                 udf_expand_dir_adinicb(dir, &block, err);
 417                 if (!fibh->sbh)
 418                         goto out_err;
 419                 epos.block = dinfo->i_location;
 420                 epos.offset = udf_file_entry_alloc_offset(dir);
 421                 /* Load extent udf_expand_dir_adinicb() has created */
 422                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 423         }
 424
 425         /* Entry fits into current block? */
 426         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 427                 fibh->soffset = fibh->eoffset;
 428                 fibh->eoffset += nfidlen;
 429                 if (fibh->sbh != fibh->ebh) {
 430                         brelse(fibh->sbh);
 431                         fibh->sbh = fibh->ebh;
 432                 }
 433
 434                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 435                         block = dinfo->i_location.logicalBlockNum;
 436                         fi = (struct fileIdentDesc *)
 437                                         (dinfo->i_ext.i_data +
 438                                          fibh->soffset -
 439                                          udf_ext0_offset(dir) +
 440                                          dinfo->i_lenEAttr);
 441                 } else {
 442                         block = eloc.logicalBlockNum +
 443                                         ((elen - 1) >>
 444                                                 dir->i_sb->s_blocksize_bits);
 445                         fi = (struct fileIdentDesc *)
 446                                 (fibh->sbh->b_data + fibh->soffset);
 447                 }
 448         } else {
 449                 /* Round up last extent in the file */
 450                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 451                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 452                         epos.offset -= sizeof(struct short_ad);
 453                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 454                         epos.offset -= sizeof(struct long_ad);
 455                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 456                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 457                                         - 1) & ~(sb->s_blocksize - 1);
 458
 459                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 460                 fibh->eoffset += nfidlen - sb->s_blocksize;
 461                 if (fibh->sbh != fibh->ebh) {
 462                         brelse(fibh->sbh);
 463                         fibh->sbh = fibh->ebh;
 464                 }
 465
 466                 block = eloc.logicalBlockNum + ((elen - 1) >>
 467                                                 dir->i_sb->s_blocksize_bits);
 468                 fibh->ebh = udf_bread(dir,
 469                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 470                 if (!fibh->ebh)
 471                         goto out_err;
 472                 /* Extents could have been merged, invalidate our position */
 473                 brelse(epos.bh);
 474                 epos.bh = NULL;
 475                 epos.block = dinfo->i_location;
 476                 epos.offset = udf_file_entry_alloc_offset(dir);
 477
 478                 if (!fibh->soffset) {
 479                         /* Find the freshly allocated block */
 480                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 481                                 (EXT_RECORDED_ALLOCATED >> 30))
 482                                 ;
 483                         block = eloc.logicalBlockNum + ((elen - 1) >>
 484                                         dir->i_sb->s_blocksize_bits);
 485                         brelse(fibh->sbh);
 486                         fibh->sbh = fibh->ebh;
 487                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 488                 } else {
 489                         fi = (struct fileIdentDesc *)
 490                                 (fibh->sbh->b_data + sb->s_blocksize +
 491                                         fibh->soffset);
 492                 }
 493         }
 494
 495         memset(cfi, 0, sizeof(struct fileIdentDesc));
 496         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 497                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 498                             sizeof(struct tag));
 499         else
 500                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 501                             sizeof(struct tag));
 502         cfi->fileVersionNum = cpu_to_le16(1);
 503         cfi->lengthFileIdent = namelen;
 504         cfi->lengthOfImpUse = cpu_to_le16(0);
 505         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 506                 dir->i_size += nfidlen;
 507                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 508                         dinfo->i_lenAlloc += nfidlen;
 509                 else {
 510                         /* Find the last extent and truncate it to proper size */
 511                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 512                                 (EXT_RECORDED_ALLOCATED >> 30))
 513                                 ;
 514                         elen -= dinfo->i_lenExtents - dir->i_size;
 515                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 516                                 epos.offset -= sizeof(struct short_ad);
 517                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 518                                 epos.offset -= sizeof(struct long_ad);
 519                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 520                         dinfo->i_lenExtents = dir->i_size;
 521                 }
 522
 523                 mark_inode_dirty(dir);
 524                 goto out_ok;
 525         } else {
 526                 *err = -EIO;
 527                 goto out_err;
 528         }
 529
 530 out_err:
 531         fi = NULL;
 532         if (fibh->sbh != fibh->ebh)
 533                 brelse(fibh->ebh);
 534         brelse(fibh->sbh);
 535 out_ok:
 536         brelse(epos.bh);
 537         kfree(name);
 538         return fi;
 539 }
 540
 541 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 542                             struct udf_fileident_bh *fibh,
 543                             struct fileIdentDesc *cfi)
 544 {
 545         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 546
 547         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 548                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 549
 550         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 551 }
 552
 553 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 554                       struct nameidata *nd)
 555 {
 556         struct udf_fileident_bh fibh;
 557         struct inode *inode;
 558         struct fileIdentDesc cfi, *fi;
 559         int err;
 560         struct udf_inode_info *iinfo;
 561
 562         inode = udf_new_inode(dir, mode, &err);
 563         if (!inode) {
 564                 return err;
 565         }
 566
 567         iinfo = UDF_I(inode);
 568         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 569                 inode->i_data.a_ops = &udf_adinicb_aops;
 570         else
 571                 inode->i_data.a_ops = &udf_aops;
 572         inode->i_op = &udf_file_inode_operations;
 573         inode->i_fop = &udf_file_operations;
 574         mark_inode_dirty(inode);
 575
 576         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 577         if (!fi) {
 578                 inode_dec_link_count(inode);
 579                 iput(inode);
 580                 return err;
 581         }
 582         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 583         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 584         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 585                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 586         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 587         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 588                 mark_inode_dirty(dir);
 589         if (fibh.sbh != fibh.ebh)
 590                 brelse(fibh.ebh);
 591         brelse(fibh.sbh);
 592         d_instantiate(dentry, inode);
 593
 594         return 0;
 595 }
 596
 597 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 598                      dev_t rdev)
 599 {
 600         struct inode *inode;
 601         struct udf_fileident_bh fibh;
 602         struct fileIdentDesc cfi, *fi;
 603         int err;
 604         struct udf_inode_info *iinfo;
 605
 606         if (!old_valid_dev(rdev))
 607                 return -EINVAL;
 608
 609         err = -EIO;
 610         inode = udf_new_inode(dir, mode, &err);
 611         if (!inode)
 612                 goto out;
 613
 614         iinfo = UDF_I(inode);
 615         init_special_inode(inode, mode, rdev);
 616         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 617         if (!fi) {
 618                 inode_dec_link_count(inode);
 619                 iput(inode);
 620                 return err;
 621         }
 622         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 623         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 624         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 625                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 626         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 627         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 628                 mark_inode_dirty(dir);
 629         mark_inode_dirty(inode);
 630
 631         if (fibh.sbh != fibh.ebh)
 632                 brelse(fibh.ebh);
 633         brelse(fibh.sbh);
 634         d_instantiate(dentry, inode);
 635         err = 0;
 636
 637 out:
 638         return err;
 639 }
 640
 641 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 642 {
 643         struct inode *inode;
 644         struct udf_fileident_bh fibh;
 645         struct fileIdentDesc cfi, *fi;
 646         int err;
 647         struct udf_inode_info *dinfo = UDF_I(dir);
 648         struct udf_inode_info *iinfo;
 649
 650         err = -EIO;
 651         inode = udf_new_inode(dir, S_IFDIR | mode, &err);
 652         if (!inode)
 653                 goto out;
 654
 655         iinfo = UDF_I(inode);
 656         inode->i_op = &udf_dir_inode_operations;
 657         inode->i_fop = &udf_dir_operations;
 658         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 659         if (!fi) {
 660                 inode_dec_link_count(inode);
 661                 iput(inode);
 662                 goto out;
 663         }
 664         set_nlink(inode, 2);
 665         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 666         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 667         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 668                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 669         cfi.fileCharacteristics =
 670                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 671         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 672         brelse(fibh.sbh);
 673         mark_inode_dirty(inode);
 674
 675         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 676         if (!fi) {
 677                 clear_nlink(inode);
 678                 mark_inode_dirty(inode);
 679                 iput(inode);
 680                 goto out;
 681         }
 682         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 683         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 684         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 685                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 686         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 687         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 688         inc_nlink(dir);
 689         mark_inode_dirty(dir);
 690         d_instantiate(dentry, inode);
 691         if (fibh.sbh != fibh.ebh)
 692                 brelse(fibh.ebh);
 693         brelse(fibh.sbh);
 694         err = 0;
 695
 696 out:
 697         return err;
 698 }
 699
 700 static int empty_dir(struct inode *dir)
 701 {
 702         struct fileIdentDesc *fi, cfi;
 703         struct udf_fileident_bh fibh;
 704         loff_t f_pos;
 705         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 706         int block;
 707         struct kernel_lb_addr eloc;
 708         uint32_t elen;
 709         sector_t offset;
 710         struct extent_position epos = {};
 711         struct udf_inode_info *dinfo = UDF_I(dir);
 712
 713         f_pos = udf_ext0_offset(dir);
 714         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 715
 716         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 717                 fibh.sbh = fibh.ebh = NULL;
 718         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 719                               &epos, &eloc, &elen, &offset) ==
 720                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 721                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 722                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 723                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 724                                 epos.offset -= sizeof(struct short_ad);
 725                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 726                                 epos.offset -= sizeof(struct long_ad);
 727                 } else
 728                         offset = 0;
 729
 730                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 731                 if (!fibh.sbh) {
 732                         brelse(epos.bh);
 733                         return 0;
 734                 }
 735         } else {
 736                 brelse(epos.bh);
 737                 return 0;
 738         }
 739
 740         while (f_pos < size) {
 741                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 742                                         &elen, &offset);
 743                 if (!fi) {
 744                         if (fibh.sbh != fibh.ebh)
 745                                 brelse(fibh.ebh);
 746                         brelse(fibh.sbh);
 747                         brelse(epos.bh);
 748                         return 0;
 749                 }
 750
 751                 if (cfi.lengthFileIdent &&
 752                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 753                         if (fibh.sbh != fibh.ebh)
 754                                 brelse(fibh.ebh);
 755                         brelse(fibh.sbh);
 756                         brelse(epos.bh);
 757                         return 0;
 758                 }
 759         }
 760
 761         if (fibh.sbh != fibh.ebh)
 762                 brelse(fibh.ebh);
 763         brelse(fibh.sbh);
 764         brelse(epos.bh);
 765
 766         return 1;
 767 }
 768
 769 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 770 {
 771         int retval;
 772         struct inode *inode = dentry->d_inode;
 773         struct udf_fileident_bh fibh;
 774         struct fileIdentDesc *fi, cfi;
 775         struct kernel_lb_addr tloc;
 776
 777         retval = -ENOENT;
 778         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 779         if (!fi)
 780                 goto out;
 781
 782         retval = -EIO;
 783         tloc = lelb_to_cpu(cfi.icb.extLocation);
 784         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 785                 goto end_rmdir;
 786         retval = -ENOTEMPTY;
 787         if (!empty_dir(inode))
 788                 goto end_rmdir;
 789         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 790         if (retval)
 791                 goto end_rmdir;
 792         if (inode->i_nlink != 2)
 793                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
 794                          inode->i_nlink);
 795         clear_nlink(inode);
 796         inode->i_size = 0;
 797         inode_dec_link_count(dir);
 798         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 799                                                 current_fs_time(dir->i_sb);
 800         mark_inode_dirty(dir);
 801
 802 end_rmdir:
 803         if (fibh.sbh != fibh.ebh)
 804                 brelse(fibh.ebh);
 805         brelse(fibh.sbh);
 806
 807 out:
 808         return retval;
 809 }
 810
 811 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 812 {
 813         int retval;
 814         struct inode *inode = dentry->d_inode;
 815         struct udf_fileident_bh fibh;
 816         struct fileIdentDesc *fi;
 817         struct fileIdentDesc cfi;
 818         struct kernel_lb_addr tloc;
 819
 820         retval = -ENOENT;
 821         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 822         if (!fi)
 823                 goto out;
 824
 825         retval = -EIO;
 826         tloc = lelb_to_cpu(cfi.icb.extLocation);
 827         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 828                 goto end_unlink;
 829
 830         if (!inode->i_nlink) {
 831                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 832                           inode->i_ino, inode->i_nlink);
 833                 set_nlink(inode, 1);
 834         }
 835         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 836         if (retval)
 837                 goto end_unlink;
 838         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 839         mark_inode_dirty(dir);
 840         inode_dec_link_count(inode);
 841         inode->i_ctime = dir->i_ctime;
 842         retval = 0;
 843
 844 end_unlink:
 845         if (fibh.sbh != fibh.ebh)
 846                 brelse(fibh.ebh);
 847         brelse(fibh.sbh);
 848
 849 out:
 850         return retval;
 851 }
 852
 853 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 854                        const char *symname)
 855 {
 856         struct inode *inode;
 857         struct pathComponent *pc;
 858         const char *compstart;
 859         struct udf_fileident_bh fibh;
 860         struct extent_position epos = {};
 861         int eoffset, elen = 0;
 862         struct fileIdentDesc *fi;
 863         struct fileIdentDesc cfi;
 864         uint8_t *ea;
 865         int err;
 866         int block;
 867         unsigned char *name = NULL;
 868         int namelen;
 869         struct udf_inode_info *iinfo;
 870         struct super_block *sb = dir->i_sb;
 871
 872         inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
 873         if (!inode)
 874                 goto out;
 875
 876         iinfo = UDF_I(inode);
 877         down_write(&iinfo->i_data_sem);
 878         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 879         if (!name) {
 880                 err = -ENOMEM;
 881                 goto out_no_entry;
 882         }
 883
 884         inode->i_data.a_ops = &udf_symlink_aops;
 885         inode->i_op = &udf_symlink_inode_operations;
 886
 887         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 888                 struct kernel_lb_addr eloc;
 889                 uint32_t bsize;
 890
 891                 block = udf_new_block(sb, inode,
 892                                 iinfo->i_location.partitionReferenceNum,
 893                                 iinfo->i_location.logicalBlockNum, &err);
 894                 if (!block)
 895                         goto out_no_entry;
 896                 epos.block = iinfo->i_location;
 897                 epos.offset = udf_file_entry_alloc_offset(inode);
 898                 epos.bh = NULL;
 899                 eloc.logicalBlockNum = block;
 900                 eloc.partitionReferenceNum =
 901                                 iinfo->i_location.partitionReferenceNum;
 902                 bsize = sb->s_blocksize;
 903                 iinfo->i_lenExtents = bsize;
 904                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 905                 brelse(epos.bh);
 906
 907                 block = udf_get_pblock(sb, block,
 908                                 iinfo->i_location.partitionReferenceNum,
 909                                 0);
 910                 epos.bh = udf_tgetblk(sb, block);
 911                 lock_buffer(epos.bh);
 912                 memset(epos.bh->b_data, 0x00, bsize);
 913                 set_buffer_uptodate(epos.bh);
 914                 unlock_buffer(epos.bh);
 915                 mark_buffer_dirty_inode(epos.bh, inode);
 916                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 917         } else
 918                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 919
 920         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 921         pc = (struct pathComponent *)ea;
 922
 923         if (*symname == '/') {
 924                 do {
 925                         symname++;
 926                 } while (*symname == '/');
 927
 928                 pc->componentType = 1;
 929                 pc->lengthComponentIdent = 0;
 930                 pc->componentFileVersionNum = 0;
 931                 elen += sizeof(struct pathComponent);
 932         }
 933
 934         err = -ENAMETOOLONG;
 935
 936         while (*symname) {
 937                 if (elen + sizeof(struct pathComponent) > eoffset)
 938                         goto out_no_entry;
 939
 940                 pc = (struct pathComponent *)(ea + elen);
 941
 942                 compstart = symname;
 943
 944                 do {
 945                         symname++;
 946                 } while (*symname && *symname != '/');
 947
 948                 pc->componentType = 5;
 949                 pc->lengthComponentIdent = 0;
 950                 pc->componentFileVersionNum = 0;
 951                 if (compstart[0] == '.') {
 952                         if ((symname - compstart) == 1)
 953                                 pc->componentType = 4;
 954                         else if ((symname - compstart) == 2 &&
 955                                         compstart[1] == '.')
 956                                 pc->componentType = 3;
 957                 }
 958
 959                 if (pc->componentType == 5) {
 960                         namelen = udf_put_filename(sb, compstart, name,
 961                                                    symname - compstart);
 962                         if (!namelen)
 963                                 goto out_no_entry;
 964
 965                         if (elen + sizeof(struct pathComponent) + namelen >
 966                                         eoffset)
 967                                 goto out_no_entry;
 968                         else
 969                                 pc->lengthComponentIdent = namelen;
 970
 971                         memcpy(pc->componentIdent, name, namelen);
 972                 }
 973
 974                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
 975
 976                 if (*symname) {
 977                         do {
 978                                 symname++;
 979                         } while (*symname == '/');
 980                 }
 981         }
 982
 983         brelse(epos.bh);
 984         inode->i_size = elen;
 985         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 986                 iinfo->i_lenAlloc = inode->i_size;
 987         else
 988                 udf_truncate_tail_extent(inode);
 989         mark_inode_dirty(inode);
 990
 991         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 992         if (!fi)
 993                 goto out_no_entry;
 994         cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
 995         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 996         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
 997                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 998                         cpu_to_le32(lvid_get_unique_id(sb));
 999         }
1000         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1001         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1002                 mark_inode_dirty(dir);
1003         up_write(&iinfo->i_data_sem);
1004         if (fibh.sbh != fibh.ebh)
1005                 brelse(fibh.ebh);
1006         brelse(fibh.sbh);
1007         d_instantiate(dentry, inode);
1008         err = 0;
1009
1010 out:
1011         kfree(name);
1012         return err;
1013
1014 out_no_entry:
1015         up_write(&iinfo->i_data_sem);
1016         inode_dec_link_count(inode);
1017         iput(inode);
1018         goto out;
1019 }
1020
1021 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1022                     struct dentry *dentry)
1023 {
1024         struct inode *inode = old_dentry->d_inode;
1025         struct udf_fileident_bh fibh;
1026         struct fileIdentDesc cfi, *fi;
1027         int err;
1028
1029         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1030         if (!fi) {
1031                 return err;
1032         }
1033         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1034         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1035         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1036                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1037                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1038         }
1039         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1040         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1041                 mark_inode_dirty(dir);
1042
1043         if (fibh.sbh != fibh.ebh)
1044                 brelse(fibh.ebh);
1045         brelse(fibh.sbh);
1046         inc_nlink(inode);
1047         inode->i_ctime = current_fs_time(inode->i_sb);
1048         mark_inode_dirty(inode);
1049         ihold(inode);
1050         d_instantiate(dentry, inode);
1051
1052         return 0;
1053 }
1054
1055 /* Anybody can rename anything with this: the permission checks are left to the
1056  * higher-level routines.
1057  */
1058 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1059                       struct inode *new_dir, struct dentry *new_dentry)
1060 {
1061         struct inode *old_inode = old_dentry->d_inode;
1062         struct inode *new_inode = new_dentry->d_inode;
1063         struct udf_fileident_bh ofibh, nfibh;
1064         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1065         struct fileIdentDesc ocfi, ncfi;
1066         struct buffer_head *dir_bh = NULL;
1067         int retval = -ENOENT;
1068         struct kernel_lb_addr tloc;
1069         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1070
1071         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1072         if (ofi) {
1073                 if (ofibh.sbh != ofibh.ebh)
1074                         brelse(ofibh.ebh);
1075                 brelse(ofibh.sbh);
1076         }
1077         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1078         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1079             != old_inode->i_ino)
1080                 goto end_rename;
1081
1082         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1083         if (nfi) {
1084                 if (!new_inode) {
1085                         if (nfibh.sbh != nfibh.ebh)
1086                                 brelse(nfibh.ebh);
1087                         brelse(nfibh.sbh);
1088                         nfi = NULL;
1089                 }
1090         }
1091         if (S_ISDIR(old_inode->i_mode)) {
1092                 int offset = udf_ext0_offset(old_inode);
1093
1094                 if (new_inode) {
1095                         retval = -ENOTEMPTY;
1096                         if (!empty_dir(new_inode))
1097                                 goto end_rename;
1098                 }
1099                 retval = -EIO;
1100                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1101                         dir_fi = udf_get_fileident(
1102                                         old_iinfo->i_ext.i_data -
1103                                           (old_iinfo->i_efe ?
1104                                            sizeof(struct extendedFileEntry) :
1105                                            sizeof(struct fileEntry)),
1106                                         old_inode->i_sb->s_blocksize, &offset);
1107                 } else {
1108                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1109                         if (!dir_bh)
1110                                 goto end_rename;
1111                         dir_fi = udf_get_fileident(dir_bh->b_data,
1112                                         old_inode->i_sb->s_blocksize, &offset);
1113                 }
1114                 if (!dir_fi)
1115                         goto end_rename;
1116                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1117                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1118                                 old_dir->i_ino)
1119                         goto end_rename;
1120         }
1121         if (!nfi) {
1122                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1123                                     &retval);
1124                 if (!nfi)
1125                         goto end_rename;
1126         }
1127
1128         /*
1129          * Like most other Unix systems, set the ctime for inodes on a
1130          * rename.
1131          */
1132         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1133         mark_inode_dirty(old_inode);
1134
1135         /*
1136          * ok, that's it
1137          */
1138         ncfi.fileVersionNum = ocfi.fileVersionNum;
1139         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1140         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1141         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1142
1143         /* The old fid may have moved - find it again */
1144         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1145         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1146
1147         if (new_inode) {
1148                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1149                 inode_dec_link_count(new_inode);
1150         }
1151         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1152         mark_inode_dirty(old_dir);
1153
1154         if (dir_fi) {
1155                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1156                 udf_update_tag((char *)dir_fi,
1157                                 (sizeof(struct fileIdentDesc) +
1158                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1159                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1160                         mark_inode_dirty(old_inode);
1161                 else
1162                         mark_buffer_dirty_inode(dir_bh, old_inode);
1163
1164                 inode_dec_link_count(old_dir);
1165                 if (new_inode)
1166                         inode_dec_link_count(new_inode);
1167                 else {
1168                         inc_nlink(new_dir);
1169                         mark_inode_dirty(new_dir);
1170                 }
1171         }
1172
1173         if (ofi) {
1174                 if (ofibh.sbh != ofibh.ebh)
1175                         brelse(ofibh.ebh);
1176                 brelse(ofibh.sbh);
1177         }
1178
1179         retval = 0;
1180
1181 end_rename:
1182         brelse(dir_bh);
1183         if (nfi) {
1184                 if (nfibh.sbh != nfibh.ebh)
1185                         brelse(nfibh.ebh);
1186                 brelse(nfibh.sbh);
1187         }
1188
1189         return retval;
1190 }
1191
1192 static struct dentry *udf_get_parent(struct dentry *child)
1193 {
1194         struct kernel_lb_addr tloc;
1195         struct inode *inode = NULL;
1196         struct qstr dotdot = QSTR_INIT("..", 2);
1197         struct fileIdentDesc cfi;
1198         struct udf_fileident_bh fibh;
1199
1200         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1201                 goto out_unlock;
1202
1203         if (fibh.sbh != fibh.ebh)
1204                 brelse(fibh.ebh);
1205         brelse(fibh.sbh);
1206
1207         tloc = lelb_to_cpu(cfi.icb.extLocation);
1208         inode = udf_iget(child->d_inode->i_sb, &tloc);
1209         if (!inode)
1210                 goto out_unlock;
1211
1212         return d_obtain_alias(inode);
1213 out_unlock:
1214         return ERR_PTR(-EACCES);
1215 }
1216
1217
1218 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1219                                         u16 partref, __u32 generation)
1220 {
1221         struct inode *inode;
1222         struct kernel_lb_addr loc;
1223
1224         if (block == 0)
1225                 return ERR_PTR(-ESTALE);
1226
1227         loc.logicalBlockNum = block;
1228         loc.partitionReferenceNum = partref;
1229         inode = udf_iget(sb, &loc);
1230
1231         if (inode == NULL)
1232                 return ERR_PTR(-ENOMEM);
1233
1234         if (generation && inode->i_generation != generation) {
1235                 iput(inode);
1236                 return ERR_PTR(-ESTALE);
1237         }
1238         return d_obtain_alias(inode);
1239 }
1240
1241 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1242                                        struct fid *fid, int fh_len, int fh_type)
1243 {
1244         if ((fh_len != 3 && fh_len != 5) ||
1245             (fh_type != FILEID_UDF_WITH_PARENT &&
1246              fh_type != FILEID_UDF_WITHOUT_PARENT))
1247                 return NULL;
1248
1249         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1250                         fid->udf.generation);
1251 }
1252
1253 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1254                                        struct fid *fid, int fh_len, int fh_type)
1255 {
1256         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1257                 return NULL;
1258
1259         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1260                                  fid->udf.parent_partref,
1261                                  fid->udf.parent_generation);
1262 }
1263 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1264                          struct inode *parent)
1265 {
1266         int len = *lenp;
1267         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1268         struct fid *fid = (struct fid *)fh;
1269         int type = FILEID_UDF_WITHOUT_PARENT;
1270
1271         if (parent && (len < 5)) {
1272                 *lenp = 5;
1273                 return 255;
1274         } else if (len < 3) {
1275                 *lenp = 3;
1276                 return 255;
1277         }
1278
1279         *lenp = 3;
1280         fid->udf.block = location.logicalBlockNum;
1281         fid->udf.partref = location.partitionReferenceNum;
1282         fid->udf.generation = inode->i_generation;
1283
1284         if (parent) {
1285                 location = UDF_I(parent)->i_location;
1286                 fid->udf.parent_block = location.logicalBlockNum;
1287                 fid->udf.parent_partref = location.partitionReferenceNum;
1288                 fid->udf.parent_generation = inode->i_generation;
1289                 *lenp = 5;
1290                 type = FILEID_UDF_WITH_PARENT;
1291         }
1292
1293         return type;
1294 }
1295
1296 const struct export_operations udf_export_ops = {
1297         .encode_fh      = udf_encode_fh,
1298         .fh_to_dentry   = udf_fh_to_dentry,
1299         .fh_to_parent   = udf_fh_to_parent,
1300         .get_parent     = udf_get_parent,
1301 };
1302
1303 const struct inode_operations udf_dir_inode_operations = {
1304         .lookup                         = udf_lookup,
1305         .create                         = udf_create,
1306         .link                           = udf_link,
1307         .unlink                         = udf_unlink,
1308         .symlink                        = udf_symlink,
1309         .mkdir                          = udf_mkdir,
1310         .rmdir                          = udf_rmdir,
1311         .mknod                          = udf_mknod,
1312         .rename                         = udf_rename,
1313 };
1314 const struct inode_operations udf_symlink_inode_operations = {
1315         .readlink       = generic_readlink,
1316         .follow_link    = page_follow_link_light,
1317         .put_link       = page_put_link,
1318 };