kernel/fs/udf/namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2004 Ben Fennema
  14  *  (C) 1999-2000 Stelias Computing Inc
  15  *
  16  * HISTORY
  17  *
  18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  19  *  04/19/99 blf  link, mknod, symlink support
  20  */
  21
  22 #include "udfdecl.h"
  23
  24 #include "udf_i.h"
  25 #include "udf_sb.h"
  26 #include <linux/string.h>
  27 #include <linux/errno.h>
  28 #include <linux/mm.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched.h>
  31 #include <linux/crc-itu-t.h>
  32 #include <linux/exportfs.h>
  33
  34 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  35                             const unsigned char *name2)
  36 {
  37         if (len1 != len2)
  38                 return 0;
  39
  40         return !memcmp(name1, name2, len1);
  41 }
  42
  43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  44                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  45                  uint8_t *impuse, uint8_t *fileident)
  46 {
  47         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  48         uint16_t crc;
  49         int offset;
  50         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  51         uint8_t lfi = cfi->lengthFileIdent;
  52         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  53                 sizeof(struct fileIdentDesc);
  54         int adinicb = 0;
  55
  56         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  57                 adinicb = 1;
  58
  59         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  60
  61         if (impuse) {
  62                 if (adinicb || (offset + liu < 0)) {
  63                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  64                 } else if (offset >= 0) {
  65                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  66                 } else {
  67                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  68                         memcpy(fibh->ebh->b_data, impuse - offset,
  69                                 liu + offset);
  70                 }
  71         }
  72
  73         offset += liu;
  74
  75         if (fileident) {
  76                 if (adinicb || (offset + lfi < 0)) {
  77                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  78                 } else if (offset >= 0) {
  79                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  80                 } else {
  81                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  82                                 -offset);
  83                         memcpy(fibh->ebh->b_data, fileident - offset,
  84                                 lfi + offset);
  85                 }
  86         }
  87
  88         offset += lfi;
  89
  90         if (adinicb || (offset + padlen < 0)) {
  91                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  92         } else if (offset >= 0) {
  93                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  94         } else {
  95                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  96                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  97         }
  98
  99         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
 100                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 101
 102         if (fibh->sbh == fibh->ebh) {
 103                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 104                               crclen + sizeof(struct tag) -
 105                               sizeof(struct fileIdentDesc));
 106         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 107                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 108                                         sizeof(struct fileIdentDesc) +
 109                                         fibh->soffset,
 110                               crclen + sizeof(struct tag) -
 111                                         sizeof(struct fileIdentDesc));
 112         } else {
 113                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 114                               -fibh->soffset - sizeof(struct fileIdentDesc));
 115                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 116         }
 117
 118         cfi->descTag.descCRC = cpu_to_le16(crc);
 119         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 120         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 121
 122         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 123                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 124                         sizeof(struct fileIdentDesc));
 125         } else {
 126                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 127                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 128                        sizeof(struct fileIdentDesc) + fibh->soffset);
 129         }
 130
 131         if (adinicb) {
 132                 mark_inode_dirty(inode);
 133         } else {
 134                 if (fibh->sbh != fibh->ebh)
 135                         mark_buffer_dirty_inode(fibh->ebh, inode);
 136                 mark_buffer_dirty_inode(fibh->sbh, inode);
 137         }
 138         return 0;
 139 }
 140
 141 /**
 142  * udf_find_entry - find entry in given directory.
 143  *
 144  * @dir:        directory inode to search in
 145  * @child:      qstr of the name
 146  * @fibh:       buffer head / inode with file identifier descriptor we found
 147  * @cfi:        found file identifier descriptor with given name
 148  *
 149  * This function searches in the directory @dir for a file name @child. When
 150  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 151  * directories) containing the file identifier descriptor (FID). In that case
 152  * the function returns pointer to the FID in the buffer or inode - but note
 153  * that FID may be split among two buffers (blocks) so accessing it via that
 154  * pointer isn't easily possible. This pointer can be used only as an iterator
 155  * for other directory manipulation functions. For inspection of the FID @cfi
 156  * can be used - the found FID is copied there.
 157  *
 158  * Returns pointer to FID, NULL when nothing found, or error code.
 159  */
 160 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 161                                             const struct qstr *child,
 162                                             struct udf_fileident_bh *fibh,
 163                                             struct fileIdentDesc *cfi)
 164 {
 165         struct fileIdentDesc *fi = NULL;
 166         loff_t f_pos;
 167         int block, flen;
 168         unsigned char *fname = NULL;
 169         unsigned char *nameptr;
 170         uint8_t lfi;
 171         uint16_t liu;
 172         loff_t size;
 173         struct kernel_lb_addr eloc;
 174         uint32_t elen;
 175         sector_t offset;
 176         struct extent_position epos = {};
 177         struct udf_inode_info *dinfo = UDF_I(dir);
 178         int isdotdot = child->len == 2 &&
 179                 child->name[0] == '.' && child->name[1] == '.';
 180         struct super_block *sb = dir->i_sb;
 181
 182         size = udf_ext0_offset(dir) + dir->i_size;
 183         f_pos = udf_ext0_offset(dir);
 184
 185         fibh->sbh = fibh->ebh = NULL;
 186         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 187         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 188                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 189                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 190                         fi = ERR_PTR(-EIO);
 191                         goto out_err;
 192                 }
 193
 194                 block = udf_get_lb_pblock(sb, &eloc, offset);
 195                 if ((++offset << sb->s_blocksize_bits) < elen) {
 196                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 197                                 epos.offset -= sizeof(struct short_ad);
 198                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 199                                 epos.offset -= sizeof(struct long_ad);
 200                 } else
 201                         offset = 0;
 202
 203                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 204                 if (!fibh->sbh) {
 205                         fi = ERR_PTR(-EIO);
 206                         goto out_err;
 207                 }
 208         }
 209
 210         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 211         if (!fname) {
 212                 fi = ERR_PTR(-ENOMEM);
 213                 goto out_err;
 214         }
 215
 216         while (f_pos < size) {
 217                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 218                                         &elen, &offset);
 219                 if (!fi) {
 220                         fi = ERR_PTR(-EIO);
 221                         goto out_err;
 222                 }
 223
 224                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 225                 lfi = cfi->lengthFileIdent;
 226
 227                 if (fibh->sbh == fibh->ebh) {
 228                         nameptr = fi->fileIdent + liu;
 229                 } else {
 230                         int poffset;    /* Unpaded ending offset */
 231
 232                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 233                                         liu + lfi;
 234
 235                         if (poffset >= lfi)
 236                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 237                                                       poffset - lfi);
 238                         else {
 239                                 nameptr = fname;
 240                                 memcpy(nameptr, fi->fileIdent + liu,
 241                                         lfi - poffset);
 242                                 memcpy(nameptr + lfi - poffset,
 243                                         fibh->ebh->b_data, poffset);
 244                         }
 245                 }
 246
 247                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 248                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 249                                 continue;
 250                 }
 251
 252                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 253                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 254                                 continue;
 255                 }
 256
 257                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 258                     isdotdot)
 259                         goto out_ok;
 260
 261                 if (!lfi)
 262                         continue;
 263
 264                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 265                 if (flen < 0) {
 266                         fi = ERR_PTR(flen);
 267                         goto out_err;
 268                 }
 269
 270                 if (udf_match(flen, fname, child->len, child->name))
 271                         goto out_ok;
 272         }
 273
 274         fi = NULL;
 275 out_err:
 276         if (fibh->sbh != fibh->ebh)
 277                 brelse(fibh->ebh);
 278         brelse(fibh->sbh);
 279 out_ok:
 280         brelse(epos.bh);
 281         kfree(fname);
 282
 283         return fi;
 284 }
 285
 286 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 287                                  unsigned int flags)
 288 {
 289         struct inode *inode = NULL;
 290         struct fileIdentDesc cfi;
 291         struct udf_fileident_bh fibh;
 292         struct fileIdentDesc *fi;
 293
 294         if (dentry->d_name.len > UDF_NAME_LEN - 2)
 295                 return ERR_PTR(-ENAMETOOLONG);
 296
 297 #ifdef UDF_RECOVERY
 298         /* temporary shorthand for specifying files by inode number */
 299         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 300                 struct kernel_lb_addr lb = {
 301                         .logicalBlockNum = 0,
 302                         .partitionReferenceNum =
 303                                 simple_strtoul(dentry->d_name.name + 3,
 304                                                 NULL, 0),
 305                 };
 306                 inode = udf_iget(dir->i_sb, lb);
 307                 if (IS_ERR(inode))
 308                         return inode;
 309         } else
 310 #endif /* UDF_RECOVERY */
 311
 312         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 313         if (IS_ERR(fi))
 314                 return ERR_CAST(fi);
 315
 316         if (fi) {
 317                 struct kernel_lb_addr loc;
 318
 319                 if (fibh.sbh != fibh.ebh)
 320                         brelse(fibh.ebh);
 321                 brelse(fibh.sbh);
 322
 323                 loc = lelb_to_cpu(cfi.icb.extLocation);
 324                 inode = udf_iget(dir->i_sb, &loc);
 325                 if (IS_ERR(inode))
 326                         return ERR_CAST(inode);
 327         }
 328
 329         return d_splice_alias(inode, dentry);
 330 }
 331
 332 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 333                                            struct dentry *dentry,
 334                                            struct udf_fileident_bh *fibh,
 335                                            struct fileIdentDesc *cfi, int *err)
 336 {
 337         struct super_block *sb = dir->i_sb;
 338         struct fileIdentDesc *fi = NULL;
 339         unsigned char *name = NULL;
 340         int namelen;
 341         loff_t f_pos;
 342         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 343         int nfidlen;
 344         uint8_t lfi;
 345         uint16_t liu;
 346         int block;
 347         struct kernel_lb_addr eloc;
 348         uint32_t elen = 0;
 349         sector_t offset;
 350         struct extent_position epos = {};
 351         struct udf_inode_info *dinfo;
 352
 353         fibh->sbh = fibh->ebh = NULL;
 354         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 355         if (!name) {
 356                 *err = -ENOMEM;
 357                 goto out_err;
 358         }
 359
 360         if (dentry) {
 361                 if (!dentry->d_name.len) {
 362                         *err = -EINVAL;
 363                         goto out_err;
 364                 }
 365                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
 366                                                  dentry->d_name.len);
 367                 if (!namelen) {
 368                         *err = -ENAMETOOLONG;
 369                         goto out_err;
 370                 }
 371         } else {
 372                 namelen = 0;
 373         }
 374
 375         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 376
 377         f_pos = udf_ext0_offset(dir);
 378
 379         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 380         dinfo = UDF_I(dir);
 381         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 382                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 383                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 384                         block = udf_get_lb_pblock(dir->i_sb,
 385                                         &dinfo->i_location, 0);
 386                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 387                         goto add;
 388                 }
 389                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 390                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 391                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 392                                 epos.offset -= sizeof(struct short_ad);
 393                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 394                                 epos.offset -= sizeof(struct long_ad);
 395                 } else
 396                         offset = 0;
 397
 398                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 399                 if (!fibh->sbh) {
 400                         *err = -EIO;
 401                         goto out_err;
 402                 }
 403
 404                 block = dinfo->i_location.logicalBlockNum;
 405         }
 406
 407         while (f_pos < size) {
 408                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 409                                         &elen, &offset);
 410
 411                 if (!fi) {
 412                         *err = -EIO;
 413                         goto out_err;
 414                 }
 415
 416                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 417                 lfi = cfi->lengthFileIdent;
 418
 419                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 420                         if (((sizeof(struct fileIdentDesc) +
 421                                         liu + lfi + 3) & ~3) == nfidlen) {
 422                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 423                                 cfi->fileVersionNum = cpu_to_le16(1);
 424                                 cfi->fileCharacteristics = 0;
 425                                 cfi->lengthFileIdent = namelen;
 426                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 427                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 428                                                   name))
 429                                         goto out_ok;
 430                                 else {
 431                                         *err = -EIO;
 432                                         goto out_err;
 433                                 }
 434                         }
 435                 }
 436         }
 437
 438 add:
 439         f_pos += nfidlen;
 440
 441         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 442             sb->s_blocksize - fibh->eoffset < nfidlen) {
 443                 brelse(epos.bh);
 444                 epos.bh = NULL;
 445                 fibh->soffset -= udf_ext0_offset(dir);
 446                 fibh->eoffset -= udf_ext0_offset(dir);
 447                 f_pos -= udf_ext0_offset(dir);
 448                 if (fibh->sbh != fibh->ebh)
 449                         brelse(fibh->ebh);
 450                 brelse(fibh->sbh);
 451                 fibh->sbh = fibh->ebh =
 452                                 udf_expand_dir_adinicb(dir, &block, err);
 453                 if (!fibh->sbh)
 454                         goto out_err;
 455                 epos.block = dinfo->i_location;
 456                 epos.offset = udf_file_entry_alloc_offset(dir);
 457                 /* Load extent udf_expand_dir_adinicb() has created */
 458                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 459         }
 460
 461         /* Entry fits into current block? */
 462         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 463                 fibh->soffset = fibh->eoffset;
 464                 fibh->eoffset += nfidlen;
 465                 if (fibh->sbh != fibh->ebh) {
 466                         brelse(fibh->sbh);
 467                         fibh->sbh = fibh->ebh;
 468                 }
 469
 470                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 471                         block = dinfo->i_location.logicalBlockNum;
 472                         fi = (struct fileIdentDesc *)
 473                                         (dinfo->i_ext.i_data +
 474                                          fibh->soffset -
 475                                          udf_ext0_offset(dir) +
 476                                          dinfo->i_lenEAttr);
 477                 } else {
 478                         block = eloc.logicalBlockNum +
 479                                         ((elen - 1) >>
 480                                                 dir->i_sb->s_blocksize_bits);
 481                         fi = (struct fileIdentDesc *)
 482                                 (fibh->sbh->b_data + fibh->soffset);
 483                 }
 484         } else {
 485                 /* Round up last extent in the file */
 486                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 487                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 488                         epos.offset -= sizeof(struct short_ad);
 489                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 490                         epos.offset -= sizeof(struct long_ad);
 491                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 492                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 493                                         - 1) & ~(sb->s_blocksize - 1);
 494
 495                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 496                 fibh->eoffset += nfidlen - sb->s_blocksize;
 497                 if (fibh->sbh != fibh->ebh) {
 498                         brelse(fibh->sbh);
 499                         fibh->sbh = fibh->ebh;
 500                 }
 501
 502                 block = eloc.logicalBlockNum + ((elen - 1) >>
 503                                                 dir->i_sb->s_blocksize_bits);
 504                 fibh->ebh = udf_bread(dir,
 505                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 506                 if (!fibh->ebh)
 507                         goto out_err;
 508                 /* Extents could have been merged, invalidate our position */
 509                 brelse(epos.bh);
 510                 epos.bh = NULL;
 511                 epos.block = dinfo->i_location;
 512                 epos.offset = udf_file_entry_alloc_offset(dir);
 513
 514                 if (!fibh->soffset) {
 515                         /* Find the freshly allocated block */
 516                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 517                                 (EXT_RECORDED_ALLOCATED >> 30))
 518                                 ;
 519                         block = eloc.logicalBlockNum + ((elen - 1) >>
 520                                         dir->i_sb->s_blocksize_bits);
 521                         brelse(fibh->sbh);
 522                         fibh->sbh = fibh->ebh;
 523                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 524                 } else {
 525                         fi = (struct fileIdentDesc *)
 526                                 (fibh->sbh->b_data + sb->s_blocksize +
 527                                         fibh->soffset);
 528                 }
 529         }
 530
 531         memset(cfi, 0, sizeof(struct fileIdentDesc));
 532         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 533                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 534                             sizeof(struct tag));
 535         else
 536                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 537                             sizeof(struct tag));
 538         cfi->fileVersionNum = cpu_to_le16(1);
 539         cfi->lengthFileIdent = namelen;
 540         cfi->lengthOfImpUse = cpu_to_le16(0);
 541         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 542                 dir->i_size += nfidlen;
 543                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 544                         dinfo->i_lenAlloc += nfidlen;
 545                 else {
 546                         /* Find the last extent and truncate it to proper size */
 547                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 548                                 (EXT_RECORDED_ALLOCATED >> 30))
 549                                 ;
 550                         elen -= dinfo->i_lenExtents - dir->i_size;
 551                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 552                                 epos.offset -= sizeof(struct short_ad);
 553                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 554                                 epos.offset -= sizeof(struct long_ad);
 555                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 556                         dinfo->i_lenExtents = dir->i_size;
 557                 }
 558
 559                 mark_inode_dirty(dir);
 560                 goto out_ok;
 561         } else {
 562                 *err = -EIO;
 563                 goto out_err;
 564         }
 565
 566 out_err:
 567         fi = NULL;
 568         if (fibh->sbh != fibh->ebh)
 569                 brelse(fibh->ebh);
 570         brelse(fibh->sbh);
 571 out_ok:
 572         brelse(epos.bh);
 573         kfree(name);
 574         return fi;
 575 }
 576
 577 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 578                             struct udf_fileident_bh *fibh,
 579                             struct fileIdentDesc *cfi)
 580 {
 581         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 582
 583         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 584                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 585
 586         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 587 }
 588
 589 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 590 {
 591         struct udf_inode_info *iinfo = UDF_I(inode);
 592         struct inode *dir = d_inode(dentry->d_parent);
 593         struct udf_fileident_bh fibh;
 594         struct fileIdentDesc cfi, *fi;
 595         int err;
 596
 597         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 598         if (unlikely(!fi)) {
 599                 inode_dec_link_count(inode);
 600                 unlock_new_inode(inode);
 601                 iput(inode);
 602                 return err;
 603         }
 604         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 605         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 606         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 607                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 608         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 609         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 610         mark_inode_dirty(dir);
 611         if (fibh.sbh != fibh.ebh)
 612                 brelse(fibh.ebh);
 613         brelse(fibh.sbh);
 614         unlock_new_inode(inode);
 615         d_instantiate(dentry, inode);
 616
 617         return 0;
 618 }
 619
 620 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 621                       bool excl)
 622 {
 623         struct inode *inode = udf_new_inode(dir, mode);
 624
 625         if (IS_ERR(inode))
 626                 return PTR_ERR(inode);
 627
 628         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 629                 inode->i_data.a_ops = &udf_adinicb_aops;
 630         else
 631                 inode->i_data.a_ops = &udf_aops;
 632         inode->i_op = &udf_file_inode_operations;
 633         inode->i_fop = &udf_file_operations;
 634         mark_inode_dirty(inode);
 635
 636         return udf_add_nondir(dentry, inode);
 637 }
 638
 639 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 640 {
 641         struct inode *inode = udf_new_inode(dir, mode);
 642
 643         if (IS_ERR(inode))
 644                 return PTR_ERR(inode);
 645
 646         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 647                 inode->i_data.a_ops = &udf_adinicb_aops;
 648         else
 649                 inode->i_data.a_ops = &udf_aops;
 650         inode->i_op = &udf_file_inode_operations;
 651         inode->i_fop = &udf_file_operations;
 652         mark_inode_dirty(inode);
 653         d_tmpfile(dentry, inode);
 654         unlock_new_inode(inode);
 655         return 0;
 656 }
 657
 658 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 659                      dev_t rdev)
 660 {
 661         struct inode *inode;
 662
 663         if (!old_valid_dev(rdev))
 664                 return -EINVAL;
 665
 666         inode = udf_new_inode(dir, mode);
 667         if (IS_ERR(inode))
 668                 return PTR_ERR(inode);
 669
 670         init_special_inode(inode, mode, rdev);
 671         return udf_add_nondir(dentry, inode);
 672 }
 673
 674 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 675 {
 676         struct inode *inode;
 677         struct udf_fileident_bh fibh;
 678         struct fileIdentDesc cfi, *fi;
 679         int err;
 680         struct udf_inode_info *dinfo = UDF_I(dir);
 681         struct udf_inode_info *iinfo;
 682
 683         inode = udf_new_inode(dir, S_IFDIR | mode);
 684         if (IS_ERR(inode))
 685                 return PTR_ERR(inode);
 686
 687         iinfo = UDF_I(inode);
 688         inode->i_op = &udf_dir_inode_operations;
 689         inode->i_fop = &udf_dir_operations;
 690         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 691         if (!fi) {
 692                 inode_dec_link_count(inode);
 693                 unlock_new_inode(inode);
 694                 iput(inode);
 695                 goto out;
 696         }
 697         set_nlink(inode, 2);
 698         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 699         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 700         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 701                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 702         cfi.fileCharacteristics =
 703                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 704         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 705         brelse(fibh.sbh);
 706         mark_inode_dirty(inode);
 707
 708         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 709         if (!fi) {
 710                 clear_nlink(inode);
 711                 mark_inode_dirty(inode);
 712                 unlock_new_inode(inode);
 713                 iput(inode);
 714                 goto out;
 715         }
 716         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 717         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 718         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 719                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 720         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 721         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 722         inc_nlink(dir);
 723         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 724         mark_inode_dirty(dir);
 725         unlock_new_inode(inode);
 726         d_instantiate(dentry, inode);
 727         if (fibh.sbh != fibh.ebh)
 728                 brelse(fibh.ebh);
 729         brelse(fibh.sbh);
 730         err = 0;
 731
 732 out:
 733         return err;
 734 }
 735
 736 static int empty_dir(struct inode *dir)
 737 {
 738         struct fileIdentDesc *fi, cfi;
 739         struct udf_fileident_bh fibh;
 740         loff_t f_pos;
 741         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 742         int block;
 743         struct kernel_lb_addr eloc;
 744         uint32_t elen;
 745         sector_t offset;
 746         struct extent_position epos = {};
 747         struct udf_inode_info *dinfo = UDF_I(dir);
 748
 749         f_pos = udf_ext0_offset(dir);
 750         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 751
 752         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 753                 fibh.sbh = fibh.ebh = NULL;
 754         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 755                               &epos, &eloc, &elen, &offset) ==
 756                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 757                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 758                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 759                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 760                                 epos.offset -= sizeof(struct short_ad);
 761                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 762                                 epos.offset -= sizeof(struct long_ad);
 763                 } else
 764                         offset = 0;
 765
 766                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 767                 if (!fibh.sbh) {
 768                         brelse(epos.bh);
 769                         return 0;
 770                 }
 771         } else {
 772                 brelse(epos.bh);
 773                 return 0;
 774         }
 775
 776         while (f_pos < size) {
 777                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 778                                         &elen, &offset);
 779                 if (!fi) {
 780                         if (fibh.sbh != fibh.ebh)
 781                                 brelse(fibh.ebh);
 782                         brelse(fibh.sbh);
 783                         brelse(epos.bh);
 784                         return 0;
 785                 }
 786
 787                 if (cfi.lengthFileIdent &&
 788                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 789                         if (fibh.sbh != fibh.ebh)
 790                                 brelse(fibh.ebh);
 791                         brelse(fibh.sbh);
 792                         brelse(epos.bh);
 793                         return 0;
 794                 }
 795         }
 796
 797         if (fibh.sbh != fibh.ebh)
 798                 brelse(fibh.ebh);
 799         brelse(fibh.sbh);
 800         brelse(epos.bh);
 801
 802         return 1;
 803 }
 804
 805 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 806 {
 807         int retval;
 808         struct inode *inode = d_inode(dentry);
 809         struct udf_fileident_bh fibh;
 810         struct fileIdentDesc *fi, cfi;
 811         struct kernel_lb_addr tloc;
 812
 813         retval = -ENOENT;
 814         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 815         if (IS_ERR_OR_NULL(fi)) {
 816                 if (fi)
 817                         retval = PTR_ERR(fi);
 818                 goto out;
 819         }
 820
 821         retval = -EIO;
 822         tloc = lelb_to_cpu(cfi.icb.extLocation);
 823         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 824                 goto end_rmdir;
 825         retval = -ENOTEMPTY;
 826         if (!empty_dir(inode))
 827                 goto end_rmdir;
 828         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 829         if (retval)
 830                 goto end_rmdir;
 831         if (inode->i_nlink != 2)
 832                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
 833                          inode->i_nlink);
 834         clear_nlink(inode);
 835         inode->i_size = 0;
 836         inode_dec_link_count(dir);
 837         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 838                                                 current_fs_time(dir->i_sb);
 839         mark_inode_dirty(dir);
 840
 841 end_rmdir:
 842         if (fibh.sbh != fibh.ebh)
 843                 brelse(fibh.ebh);
 844         brelse(fibh.sbh);
 845
 846 out:
 847         return retval;
 848 }
 849
 850 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 851 {
 852         int retval;
 853         struct inode *inode = d_inode(dentry);
 854         struct udf_fileident_bh fibh;
 855         struct fileIdentDesc *fi;
 856         struct fileIdentDesc cfi;
 857         struct kernel_lb_addr tloc;
 858
 859         retval = -ENOENT;
 860         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 861
 862         if (IS_ERR_OR_NULL(fi)) {
 863                 if (fi)
 864                         retval = PTR_ERR(fi);
 865                 goto out;
 866         }
 867
 868         retval = -EIO;
 869         tloc = lelb_to_cpu(cfi.icb.extLocation);
 870         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 871                 goto end_unlink;
 872
 873         if (!inode->i_nlink) {
 874                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 875                           inode->i_ino, inode->i_nlink);
 876                 set_nlink(inode, 1);
 877         }
 878         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 879         if (retval)
 880                 goto end_unlink;
 881         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 882         mark_inode_dirty(dir);
 883         inode_dec_link_count(inode);
 884         inode->i_ctime = dir->i_ctime;
 885         retval = 0;
 886
 887 end_unlink:
 888         if (fibh.sbh != fibh.ebh)
 889                 brelse(fibh.ebh);
 890         brelse(fibh.sbh);
 891
 892 out:
 893         return retval;
 894 }
 895
 896 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 897                        const char *symname)
 898 {
 899         struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO);
 900         struct pathComponent *pc;
 901         const char *compstart;
 902         struct extent_position epos = {};
 903         int eoffset, elen = 0;
 904         uint8_t *ea;
 905         int err;
 906         int block;
 907         unsigned char *name = NULL;
 908         int namelen;
 909         struct udf_inode_info *iinfo;
 910         struct super_block *sb = dir->i_sb;
 911
 912         if (IS_ERR(inode))
 913                 return PTR_ERR(inode);
 914
 915         iinfo = UDF_I(inode);
 916         down_write(&iinfo->i_data_sem);
 917         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 918         if (!name) {
 919                 err = -ENOMEM;
 920                 goto out_no_entry;
 921         }
 922
 923         inode->i_data.a_ops = &udf_symlink_aops;
 924         inode->i_op = &udf_symlink_inode_operations;
 925
 926         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 927                 struct kernel_lb_addr eloc;
 928                 uint32_t bsize;
 929
 930                 block = udf_new_block(sb, inode,
 931                                 iinfo->i_location.partitionReferenceNum,
 932                                 iinfo->i_location.logicalBlockNum, &err);
 933                 if (!block)
 934                         goto out_no_entry;
 935                 epos.block = iinfo->i_location;
 936                 epos.offset = udf_file_entry_alloc_offset(inode);
 937                 epos.bh = NULL;
 938                 eloc.logicalBlockNum = block;
 939                 eloc.partitionReferenceNum =
 940                                 iinfo->i_location.partitionReferenceNum;
 941                 bsize = sb->s_blocksize;
 942                 iinfo->i_lenExtents = bsize;
 943                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 944                 brelse(epos.bh);
 945
 946                 block = udf_get_pblock(sb, block,
 947                                 iinfo->i_location.partitionReferenceNum,
 948                                 0);
 949                 epos.bh = udf_tgetblk(sb, block);
 950                 lock_buffer(epos.bh);
 951                 memset(epos.bh->b_data, 0x00, bsize);
 952                 set_buffer_uptodate(epos.bh);
 953                 unlock_buffer(epos.bh);
 954                 mark_buffer_dirty_inode(epos.bh, inode);
 955                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 956         } else
 957                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 958
 959         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 960         pc = (struct pathComponent *)ea;
 961
 962         if (*symname == '/') {
 963                 do {
 964                         symname++;
 965                 } while (*symname == '/');
 966
 967                 pc->componentType = 1;
 968                 pc->lengthComponentIdent = 0;
 969                 pc->componentFileVersionNum = 0;
 970                 elen += sizeof(struct pathComponent);
 971         }
 972
 973         err = -ENAMETOOLONG;
 974
 975         while (*symname) {
 976                 if (elen + sizeof(struct pathComponent) > eoffset)
 977                         goto out_no_entry;
 978
 979                 pc = (struct pathComponent *)(ea + elen);
 980
 981                 compstart = symname;
 982
 983                 do {
 984                         symname++;
 985                 } while (*symname && *symname != '/');
 986
 987                 pc->componentType = 5;
 988                 pc->lengthComponentIdent = 0;
 989                 pc->componentFileVersionNum = 0;
 990                 if (compstart[0] == '.') {
 991                         if ((symname - compstart) == 1)
 992                                 pc->componentType = 4;
 993                         else if ((symname - compstart) == 2 &&
 994                                         compstart[1] == '.')
 995                                 pc->componentType = 3;
 996                 }
 997
 998                 if (pc->componentType == 5) {
 999                         namelen = udf_put_filename(sb, compstart, name,
1000                                                    symname - compstart);
1001                         if (!namelen)
1002                                 goto out_no_entry;
1003
1004                         if (elen + sizeof(struct pathComponent) + namelen >
1005                                         eoffset)
1006                                 goto out_no_entry;
1007                         else
1008                                 pc->lengthComponentIdent = namelen;
1009
1010                         memcpy(pc->componentIdent, name, namelen);
1011                 }
1012
1013                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1014
1015                 if (*symname) {
1016                         do {
1017                                 symname++;
1018                         } while (*symname == '/');
1019                 }
1020         }
1021
1022         brelse(epos.bh);
1023         inode->i_size = elen;
1024         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1025                 iinfo->i_lenAlloc = inode->i_size;
1026         else
1027                 udf_truncate_tail_extent(inode);
1028         mark_inode_dirty(inode);
1029         up_write(&iinfo->i_data_sem);
1030
1031         err = udf_add_nondir(dentry, inode);
1032 out:
1033         kfree(name);
1034         return err;
1035
1036 out_no_entry:
1037         up_write(&iinfo->i_data_sem);
1038         inode_dec_link_count(inode);
1039         unlock_new_inode(inode);
1040         iput(inode);
1041         goto out;
1042 }
1043
1044 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1045                     struct dentry *dentry)
1046 {
1047         struct inode *inode = d_inode(old_dentry);
1048         struct udf_fileident_bh fibh;
1049         struct fileIdentDesc cfi, *fi;
1050         int err;
1051
1052         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1053         if (!fi) {
1054                 return err;
1055         }
1056         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1057         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1058         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1059                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1060                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1061         }
1062         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1063         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1064                 mark_inode_dirty(dir);
1065
1066         if (fibh.sbh != fibh.ebh)
1067                 brelse(fibh.ebh);
1068         brelse(fibh.sbh);
1069         inc_nlink(inode);
1070         inode->i_ctime = current_fs_time(inode->i_sb);
1071         mark_inode_dirty(inode);
1072         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
1073         mark_inode_dirty(dir);
1074         ihold(inode);
1075         d_instantiate(dentry, inode);
1076
1077         return 0;
1078 }
1079
1080 /* Anybody can rename anything with this: the permission checks are left to the
1081  * higher-level routines.
1082  */
1083 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1084                       struct inode *new_dir, struct dentry *new_dentry)
1085 {
1086         struct inode *old_inode = d_inode(old_dentry);
1087         struct inode *new_inode = d_inode(new_dentry);
1088         struct udf_fileident_bh ofibh, nfibh;
1089         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1090         struct fileIdentDesc ocfi, ncfi;
1091         struct buffer_head *dir_bh = NULL;
1092         int retval = -ENOENT;
1093         struct kernel_lb_addr tloc;
1094         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1095
1096         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1097         if (IS_ERR(ofi)) {
1098                 retval = PTR_ERR(ofi);
1099                 goto end_rename;
1100         }
1101
1102         if (ofibh.sbh != ofibh.ebh)
1103                 brelse(ofibh.ebh);
1104
1105         brelse(ofibh.sbh);
1106         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1107         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1108             != old_inode->i_ino)
1109                 goto end_rename;
1110
1111         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1112         if (IS_ERR(nfi)) {
1113                 retval = PTR_ERR(nfi);
1114                 goto end_rename;
1115         }
1116         if (nfi && !new_inode) {
1117                 if (nfibh.sbh != nfibh.ebh)
1118                         brelse(nfibh.ebh);
1119                 brelse(nfibh.sbh);
1120                 nfi = NULL;
1121         }
1122         if (S_ISDIR(old_inode->i_mode)) {
1123                 int offset = udf_ext0_offset(old_inode);
1124
1125                 if (new_inode) {
1126                         retval = -ENOTEMPTY;
1127                         if (!empty_dir(new_inode))
1128                                 goto end_rename;
1129                 }
1130                 retval = -EIO;
1131                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1132                         dir_fi = udf_get_fileident(
1133                                         old_iinfo->i_ext.i_data -
1134                                           (old_iinfo->i_efe ?
1135                                            sizeof(struct extendedFileEntry) :
1136                                            sizeof(struct fileEntry)),
1137                                         old_inode->i_sb->s_blocksize, &offset);
1138                 } else {
1139                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1140                         if (!dir_bh)
1141                                 goto end_rename;
1142                         dir_fi = udf_get_fileident(dir_bh->b_data,
1143                                         old_inode->i_sb->s_blocksize, &offset);
1144                 }
1145                 if (!dir_fi)
1146                         goto end_rename;
1147                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1148                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1149                                 old_dir->i_ino)
1150                         goto end_rename;
1151         }
1152         if (!nfi) {
1153                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1154                                     &retval);
1155                 if (!nfi)
1156                         goto end_rename;
1157         }
1158
1159         /*
1160          * Like most other Unix systems, set the ctime for inodes on a
1161          * rename.
1162          */
1163         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1164         mark_inode_dirty(old_inode);
1165
1166         /*
1167          * ok, that's it
1168          */
1169         ncfi.fileVersionNum = ocfi.fileVersionNum;
1170         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1171         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1172         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1173
1174         /* The old fid may have moved - find it again */
1175         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1176         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1177
1178         if (new_inode) {
1179                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1180                 inode_dec_link_count(new_inode);
1181         }
1182         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1183         new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1184         mark_inode_dirty(old_dir);
1185         mark_inode_dirty(new_dir);
1186
1187         if (dir_fi) {
1188                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1189                 udf_update_tag((char *)dir_fi,
1190                                 (sizeof(struct fileIdentDesc) +
1191                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1192                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1193                         mark_inode_dirty(old_inode);
1194                 else
1195                         mark_buffer_dirty_inode(dir_bh, old_inode);
1196
1197                 inode_dec_link_count(old_dir);
1198                 if (new_inode)
1199                         inode_dec_link_count(new_inode);
1200                 else {
1201                         inc_nlink(new_dir);
1202                         mark_inode_dirty(new_dir);
1203                 }
1204         }
1205
1206         if (ofi) {
1207                 if (ofibh.sbh != ofibh.ebh)
1208                         brelse(ofibh.ebh);
1209                 brelse(ofibh.sbh);
1210         }
1211
1212         retval = 0;
1213
1214 end_rename:
1215         brelse(dir_bh);
1216         if (nfi) {
1217                 if (nfibh.sbh != nfibh.ebh)
1218                         brelse(nfibh.ebh);
1219                 brelse(nfibh.sbh);
1220         }
1221
1222         return retval;
1223 }
1224
1225 static struct dentry *udf_get_parent(struct dentry *child)
1226 {
1227         struct kernel_lb_addr tloc;
1228         struct inode *inode = NULL;
1229         struct qstr dotdot = QSTR_INIT("..", 2);
1230         struct fileIdentDesc cfi;
1231         struct udf_fileident_bh fibh;
1232
1233         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1234                 return ERR_PTR(-EACCES);
1235
1236         if (fibh.sbh != fibh.ebh)
1237                 brelse(fibh.ebh);
1238         brelse(fibh.sbh);
1239
1240         tloc = lelb_to_cpu(cfi.icb.extLocation);
1241         inode = udf_iget(d_inode(child)->i_sb, &tloc);
1242         if (IS_ERR(inode))
1243                 return ERR_CAST(inode);
1244
1245         return d_obtain_alias(inode);
1246 }
1247
1248
1249 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1250                                         u16 partref, __u32 generation)
1251 {
1252         struct inode *inode;
1253         struct kernel_lb_addr loc;
1254
1255         if (block == 0)
1256                 return ERR_PTR(-ESTALE);
1257
1258         loc.logicalBlockNum = block;
1259         loc.partitionReferenceNum = partref;
1260         inode = udf_iget(sb, &loc);
1261
1262         if (IS_ERR(inode))
1263                 return ERR_CAST(inode);
1264
1265         if (generation && inode->i_generation != generation) {
1266                 iput(inode);
1267                 return ERR_PTR(-ESTALE);
1268         }
1269         return d_obtain_alias(inode);
1270 }
1271
1272 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1273                                        struct fid *fid, int fh_len, int fh_type)
1274 {
1275         if (fh_len < 3 ||
1276             (fh_type != FILEID_UDF_WITH_PARENT &&
1277              fh_type != FILEID_UDF_WITHOUT_PARENT))
1278                 return NULL;
1279
1280         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1281                         fid->udf.generation);
1282 }
1283
1284 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1285                                        struct fid *fid, int fh_len, int fh_type)
1286 {
1287         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1288                 return NULL;
1289
1290         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1291                                  fid->udf.parent_partref,
1292                                  fid->udf.parent_generation);
1293 }
1294 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1295                          struct inode *parent)
1296 {
1297         int len = *lenp;
1298         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1299         struct fid *fid = (struct fid *)fh;
1300         int type = FILEID_UDF_WITHOUT_PARENT;
1301
1302         if (parent && (len < 5)) {
1303                 *lenp = 5;
1304                 return FILEID_INVALID;
1305         } else if (len < 3) {
1306                 *lenp = 3;
1307                 return FILEID_INVALID;
1308         }
1309
1310         *lenp = 3;
1311         fid->udf.block = location.logicalBlockNum;
1312         fid->udf.partref = location.partitionReferenceNum;
1313         fid->udf.parent_partref = 0;
1314         fid->udf.generation = inode->i_generation;
1315
1316         if (parent) {
1317                 location = UDF_I(parent)->i_location;
1318                 fid->udf.parent_block = location.logicalBlockNum;
1319                 fid->udf.parent_partref = location.partitionReferenceNum;
1320                 fid->udf.parent_generation = inode->i_generation;
1321                 *lenp = 5;
1322                 type = FILEID_UDF_WITH_PARENT;
1323         }
1324
1325         return type;
1326 }
1327
1328 const struct export_operations udf_export_ops = {
1329         .encode_fh      = udf_encode_fh,
1330         .fh_to_dentry   = udf_fh_to_dentry,
1331         .fh_to_parent   = udf_fh_to_parent,
1332         .get_parent     = udf_get_parent,
1333 };
1334
1335 const struct inode_operations udf_dir_inode_operations = {
1336         .lookup                         = udf_lookup,
1337         .create                         = udf_create,
1338         .link                           = udf_link,
1339         .unlink                         = udf_unlink,
1340         .symlink                        = udf_symlink,
1341         .mkdir                          = udf_mkdir,
1342         .rmdir                          = udf_rmdir,
1343         .mknod                          = udf_mknod,
1344         .rename                         = udf_rename,
1345         .tmpfile                        = udf_tmpfile,
1346 };
1347 const struct inode_operations udf_symlink_inode_operations = {
1348         .readlink       = generic_readlink,
1349         .follow_link    = page_follow_link_light,
1350         .put_link       = page_put_link,
1351 };