git.oblomov.eu Git - linux-2.6/blob - 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/quotaops.h>
  31 #include <linux/smp_lock.h>
  32 #include <linux/buffer_head.h>
  33 #include <linux/sched.h>
  34 #include <linux/crc-itu-t.h>
  35 #include <linux/exportfs.h>
  36
  37 static inline int udf_match(int len1, const char *name1, int len2,
  38                             const char *name2)
  39 {
  40         if (len1 != len2)
  41                 return 0;
  42
  43         return !memcmp(name1, name2, len1);
  44 }
  45
  46 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  47                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  48                  uint8_t *impuse, uint8_t *fileident)
  49 {
  50         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
  51         uint16_t crc;
  52         int offset;
  53         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  54         uint8_t lfi = cfi->lengthFileIdent;
  55         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  56                 sizeof(struct fileIdentDesc);
  57         int adinicb = 0;
  58
  59         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  60                 adinicb = 1;
  61
  62         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  63
  64         if (impuse) {
  65                 if (adinicb || (offset + liu < 0)) {
  66                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  67                 } else if (offset >= 0) {
  68                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  69                 } else {
  70                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  71                         memcpy(fibh->ebh->b_data, impuse - offset,
  72                                 liu + offset);
  73                 }
  74         }
  75
  76         offset += liu;
  77
  78         if (fileident) {
  79                 if (adinicb || (offset + lfi < 0)) {
  80                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  81                 } else if (offset >= 0) {
  82                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  83                 } else {
  84                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  85                                 -offset);
  86                         memcpy(fibh->ebh->b_data, fileident - offset,
  87                                 lfi + offset);
  88                 }
  89         }
  90
  91         offset += lfi;
  92
  93         if (adinicb || (offset + padlen < 0)) {
  94                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  95         } else if (offset >= 0) {
  96                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  97         } else {
  98                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  99                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
 100         }
 101
 102         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(tag),
 103                       sizeof(struct fileIdentDesc) - sizeof(tag));
 104
 105         if (fibh->sbh == fibh->ebh) {
 106                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 107                               crclen + sizeof(tag) -
 108                               sizeof(struct fileIdentDesc));
 109         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 110                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 111                                         sizeof(struct fileIdentDesc) +
 112                                         fibh->soffset,
 113                               crclen + sizeof(tag) -
 114                                         sizeof(struct fileIdentDesc));
 115         } else {
 116                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 117                               -fibh->soffset - sizeof(struct fileIdentDesc));
 118                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 119         }
 120
 121         cfi->descTag.descCRC = cpu_to_le16(crc);
 122         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 123         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 124
 125         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 126                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 127                         sizeof(struct fileIdentDesc));
 128         } else {
 129                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 130                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 131                        sizeof(struct fileIdentDesc) + fibh->soffset);
 132         }
 133
 134         if (adinicb) {
 135                 mark_inode_dirty(inode);
 136         } else {
 137                 if (fibh->sbh != fibh->ebh)
 138                         mark_buffer_dirty_inode(fibh->ebh, inode);
 139                 mark_buffer_dirty_inode(fibh->sbh, inode);
 140         }
 141         return 0;
 142 }
 143
 144 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 145                                             struct dentry *dentry,
 146                                             struct udf_fileident_bh *fibh,
 147                                             struct fileIdentDesc *cfi)
 148 {
 149         struct fileIdentDesc *fi = NULL;
 150         loff_t f_pos;
 151         int block, flen;
 152         char *fname = NULL;
 153         char *nameptr;
 154         uint8_t lfi;
 155         uint16_t liu;
 156         loff_t size;
 157         kernel_lb_addr eloc;
 158         uint32_t elen;
 159         sector_t offset;
 160         struct extent_position epos = {};
 161         struct udf_inode_info *dinfo = UDF_I(dir);
 162         int isdotdot = dentry->d_name.len == 2 &&
 163                 dentry->d_name.name[0] == '.' && dentry->d_name.name[1] == '.';
 164
 165         size = udf_ext0_offset(dir) + dir->i_size;
 166         f_pos = udf_ext0_offset(dir);
 167
 168         fibh->sbh = fibh->ebh = NULL;
 169         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 170         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 171                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 172                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
 173                         goto out_err;
 174                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 175                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 176                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 177                                 epos.offset -= sizeof(short_ad);
 178                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 179                                 epos.offset -= sizeof(long_ad);
 180                 } else
 181                         offset = 0;
 182
 183                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 184                 if (!fibh->sbh)
 185                         goto out_err;
 186         }
 187
 188         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 189         if (!fname)
 190                 goto out_err;
 191
 192         while (f_pos < size) {
 193                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 194                                         &elen, &offset);
 195                 if (!fi)
 196                         goto out_err;
 197
 198                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 199                 lfi = cfi->lengthFileIdent;
 200
 201                 if (fibh->sbh == fibh->ebh) {
 202                         nameptr = fi->fileIdent + liu;
 203                 } else {
 204                         int poffset;    /* Unpaded ending offset */
 205
 206                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 207                                         liu + lfi;
 208
 209                         if (poffset >= lfi)
 210                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 211                                                       poffset - lfi);
 212                         else {
 213                                 nameptr = fname;
 214                                 memcpy(nameptr, fi->fileIdent + liu,
 215                                         lfi - poffset);
 216                                 memcpy(nameptr + lfi - poffset,
 217                                         fibh->ebh->b_data, poffset);
 218                         }
 219                 }
 220
 221                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 222                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
 223                                 continue;
 224                 }
 225
 226                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 227                         if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
 228                                 continue;
 229                 }
 230
 231                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 232                     isdotdot) {
 233                         brelse(epos.bh);
 234                         return fi;
 235                 }
 236
 237                 if (!lfi)
 238                         continue;
 239
 240                 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
 241                 if (flen && udf_match(flen, fname, dentry->d_name.len,
 242                                       dentry->d_name.name))
 243                         goto out_ok;
 244         }
 245
 246 out_err:
 247         fi = NULL;
 248         if (fibh->sbh != fibh->ebh)
 249                 brelse(fibh->ebh);
 250         brelse(fibh->sbh);
 251 out_ok:
 252         brelse(epos.bh);
 253         kfree(fname);
 254
 255         return fi;
 256 }
 257
 258 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 259                                  struct nameidata *nd)
 260 {
 261         struct inode *inode = NULL;
 262         struct fileIdentDesc cfi;
 263         struct udf_fileident_bh fibh;
 264
 265         if (dentry->d_name.len > UDF_NAME_LEN - 2)
 266                 return ERR_PTR(-ENAMETOOLONG);
 267
 268         lock_kernel();
 269 #ifdef UDF_RECOVERY
 270         /* temporary shorthand for specifying files by inode number */
 271         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 272                 kernel_lb_addr lb = {
 273                         .logicalBlockNum = 0,
 274                         .partitionReferenceNum =
 275                                 simple_strtoul(dentry->d_name.name + 3,
 276                                                 NULL, 0),
 277                 };
 278                 inode = udf_iget(dir->i_sb, lb);
 279                 if (!inode) {
 280                         unlock_kernel();
 281                         return ERR_PTR(-EACCES);
 282                 }
 283         } else
 284 #endif /* UDF_RECOVERY */
 285
 286         if (udf_find_entry(dir, dentry, &fibh, &cfi)) {
 287                 if (fibh.sbh != fibh.ebh)
 288                         brelse(fibh.ebh);
 289                 brelse(fibh.sbh);
 290
 291                 inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
 292                 if (!inode) {
 293                         unlock_kernel();
 294                         return ERR_PTR(-EACCES);
 295                 }
 296         }
 297         unlock_kernel();
 298
 299         return d_splice_alias(inode, dentry);
 300 }
 301
 302 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 303                                            struct dentry *dentry,
 304                                            struct udf_fileident_bh *fibh,
 305                                            struct fileIdentDesc *cfi, int *err)
 306 {
 307         struct super_block *sb = dir->i_sb;
 308         struct fileIdentDesc *fi = NULL;
 309         char *name = NULL;
 310         int namelen;
 311         loff_t f_pos;
 312         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 313         int nfidlen;
 314         uint8_t lfi;
 315         uint16_t liu;
 316         int block;
 317         kernel_lb_addr eloc;
 318         uint32_t elen = 0;
 319         sector_t offset;
 320         struct extent_position epos = {};
 321         struct udf_inode_info *dinfo;
 322
 323         fibh->sbh = fibh->ebh = NULL;
 324         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 325         if (!name) {
 326                 *err = -ENOMEM;
 327                 goto out_err;
 328         }
 329
 330         if (dentry) {
 331                 if (!dentry->d_name.len) {
 332                         *err = -EINVAL;
 333                         goto out_err;
 334                 }
 335                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
 336                                                  dentry->d_name.len);
 337                 if (!namelen) {
 338                         *err = -ENAMETOOLONG;
 339                         goto out_err;
 340                 }
 341         } else {
 342                 namelen = 0;
 343         }
 344
 345         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 346
 347         f_pos = udf_ext0_offset(dir);
 348
 349         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 350         dinfo = UDF_I(dir);
 351         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 352                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 353                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 354                         block = udf_get_lb_pblock(dir->i_sb,
 355                                         dinfo->i_location, 0);
 356                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 357                         goto add;
 358                 }
 359                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 360                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 361                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 362                                 epos.offset -= sizeof(short_ad);
 363                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 364                                 epos.offset -= sizeof(long_ad);
 365                 } else
 366                         offset = 0;
 367
 368                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 369                 if (!fibh->sbh) {
 370                         *err = -EIO;
 371                         goto out_err;
 372                 }
 373
 374                 block = dinfo->i_location.logicalBlockNum;
 375         }
 376
 377         while (f_pos < size) {
 378                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 379                                         &elen, &offset);
 380
 381                 if (!fi) {
 382                         *err = -EIO;
 383                         goto out_err;
 384                 }
 385
 386                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 387                 lfi = cfi->lengthFileIdent;
 388
 389                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 390                         if (((sizeof(struct fileIdentDesc) +
 391                                         liu + lfi + 3) & ~3) == nfidlen) {
 392                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 393                                 cfi->fileVersionNum = cpu_to_le16(1);
 394                                 cfi->fileCharacteristics = 0;
 395                                 cfi->lengthFileIdent = namelen;
 396                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 397                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 398                                                   name))
 399                                         goto out_ok;
 400                                 else {
 401                                         *err = -EIO;
 402                                         goto out_err;
 403                                 }
 404                         }
 405                 }
 406         }
 407
 408 add:
 409         /* Is there any extent whose size we need to round up? */
 410         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB && elen) {
 411                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 412                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 413                         epos.offset -= sizeof(short_ad);
 414                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 415                         epos.offset -= sizeof(long_ad);
 416                 udf_write_aext(dir, &epos, eloc, elen, 1);
 417         }
 418         f_pos += nfidlen;
 419
 420         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 421             sb->s_blocksize - fibh->eoffset < nfidlen) {
 422                 brelse(epos.bh);
 423                 epos.bh = NULL;
 424                 fibh->soffset -= udf_ext0_offset(dir);
 425                 fibh->eoffset -= udf_ext0_offset(dir);
 426                 f_pos -= udf_ext0_offset(dir);
 427                 if (fibh->sbh != fibh->ebh)
 428                         brelse(fibh->ebh);
 429                 brelse(fibh->sbh);
 430                 fibh->sbh = fibh->ebh =
 431                                 udf_expand_dir_adinicb(dir, &block, err);
 432                 if (!fibh->sbh)
 433                         goto out_err;
 434                 epos.block = dinfo->i_location;
 435                 epos.offset = udf_file_entry_alloc_offset(dir);
 436                 /* Load extent udf_expand_dir_adinicb() has created */
 437                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 438         }
 439
 440         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 441                 fibh->soffset = fibh->eoffset;
 442                 fibh->eoffset += nfidlen;
 443                 if (fibh->sbh != fibh->ebh) {
 444                         brelse(fibh->sbh);
 445                         fibh->sbh = fibh->ebh;
 446                 }
 447
 448                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 449                         block = dinfo->i_location.logicalBlockNum;
 450                         fi = (struct fileIdentDesc *)
 451                                         (dinfo->i_ext.i_data +
 452                                          fibh->soffset -
 453                                          udf_ext0_offset(dir) +
 454                                          dinfo->i_lenEAttr);
 455                 } else {
 456                         block = eloc.logicalBlockNum +
 457                                         ((elen - 1) >>
 458                                                 dir->i_sb->s_blocksize_bits);
 459                         fi = (struct fileIdentDesc *)
 460                                 (fibh->sbh->b_data + fibh->soffset);
 461                 }
 462         } else {
 463                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 464                 fibh->eoffset += nfidlen - sb->s_blocksize;
 465                 if (fibh->sbh != fibh->ebh) {
 466                         brelse(fibh->sbh);
 467                         fibh->sbh = fibh->ebh;
 468                 }
 469
 470                 block = eloc.logicalBlockNum + ((elen - 1) >>
 471                                                 dir->i_sb->s_blocksize_bits);
 472                 fibh->ebh = udf_bread(dir,
 473                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 474                 if (!fibh->ebh)
 475                         goto out_err;
 476
 477                 if (!fibh->soffset) {
 478                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 479                             (EXT_RECORDED_ALLOCATED >> 30)) {
 480                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 481                                         dir->i_sb->s_blocksize_bits);
 482                         } else
 483                                 block++;
 484
 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(tag));
 499         else
 500                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 501                             sizeof(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                 mark_inode_dirty(dir);
 510                 goto out_ok;
 511         } else {
 512                 *err = -EIO;
 513                 goto out_err;
 514         }
 515
 516 out_err:
 517         fi = NULL;
 518         if (fibh->sbh != fibh->ebh)
 519                 brelse(fibh->ebh);
 520         brelse(fibh->sbh);
 521 out_ok:
 522         brelse(epos.bh);
 523         kfree(name);
 524         return fi;
 525 }
 526
 527 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 528                             struct udf_fileident_bh *fibh,
 529                             struct fileIdentDesc *cfi)
 530 {
 531         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 532
 533         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 534                 memset(&(cfi->icb), 0x00, sizeof(long_ad));
 535
 536         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 537 }
 538
 539 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
 540                       struct nameidata *nd)
 541 {
 542         struct udf_fileident_bh fibh;
 543         struct inode *inode;
 544         struct fileIdentDesc cfi, *fi;
 545         int err;
 546         struct udf_inode_info *iinfo;
 547
 548         lock_kernel();
 549         inode = udf_new_inode(dir, mode, &err);
 550         if (!inode) {
 551                 unlock_kernel();
 552                 return err;
 553         }
 554
 555         iinfo = UDF_I(inode);
 556         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 557                 inode->i_data.a_ops = &udf_adinicb_aops;
 558         else
 559                 inode->i_data.a_ops = &udf_aops;
 560         inode->i_op = &udf_file_inode_operations;
 561         inode->i_fop = &udf_file_operations;
 562         inode->i_mode = mode;
 563         mark_inode_dirty(inode);
 564
 565         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 566         if (!fi) {
 567                 inode->i_nlink--;
 568                 mark_inode_dirty(inode);
 569                 iput(inode);
 570                 unlock_kernel();
 571                 return err;
 572         }
 573         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 574         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 575         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 576                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 577         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 578         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 579                 mark_inode_dirty(dir);
 580         if (fibh.sbh != fibh.ebh)
 581                 brelse(fibh.ebh);
 582         brelse(fibh.sbh);
 583         unlock_kernel();
 584         d_instantiate(dentry, inode);
 585
 586         return 0;
 587 }
 588
 589 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
 590                      dev_t rdev)
 591 {
 592         struct inode *inode;
 593         struct udf_fileident_bh fibh;
 594         struct fileIdentDesc cfi, *fi;
 595         int err;
 596         struct udf_inode_info *iinfo;
 597
 598         if (!old_valid_dev(rdev))
 599                 return -EINVAL;
 600
 601         lock_kernel();
 602         err = -EIO;
 603         inode = udf_new_inode(dir, mode, &err);
 604         if (!inode)
 605                 goto out;
 606
 607         iinfo = UDF_I(inode);
 608         inode->i_uid = current->fsuid;
 609         init_special_inode(inode, mode, rdev);
 610         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 611         if (!fi) {
 612                 inode->i_nlink--;
 613                 mark_inode_dirty(inode);
 614                 iput(inode);
 615                 unlock_kernel();
 616                 return err;
 617         }
 618         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 619         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 620         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 621                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 622         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 623         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 624                 mark_inode_dirty(dir);
 625         mark_inode_dirty(inode);
 626
 627         if (fibh.sbh != fibh.ebh)
 628                 brelse(fibh.ebh);
 629         brelse(fibh.sbh);
 630         d_instantiate(dentry, inode);
 631         err = 0;
 632
 633 out:
 634         unlock_kernel();
 635         return err;
 636 }
 637
 638 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 639 {
 640         struct inode *inode;
 641         struct udf_fileident_bh fibh;
 642         struct fileIdentDesc cfi, *fi;
 643         int err;
 644         struct udf_inode_info *dinfo = UDF_I(dir);
 645         struct udf_inode_info *iinfo;
 646
 647         lock_kernel();
 648         err = -EMLINK;
 649         if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
 650                 goto out;
 651
 652         err = -EIO;
 653         inode = udf_new_inode(dir, S_IFDIR, &err);
 654         if (!inode)
 655                 goto out;
 656
 657         iinfo = UDF_I(inode);
 658         inode->i_op = &udf_dir_inode_operations;
 659         inode->i_fop = &udf_dir_operations;
 660         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 661         if (!fi) {
 662                 inode->i_nlink--;
 663                 mark_inode_dirty(inode);
 664                 iput(inode);
 665                 goto out;
 666         }
 667         inode->i_nlink = 2;
 668         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 669         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 670         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 671                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 672         cfi.fileCharacteristics =
 673                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 674         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 675         brelse(fibh.sbh);
 676         inode->i_mode = S_IFDIR | mode;
 677         if (dir->i_mode & S_ISGID)
 678                 inode->i_mode |= S_ISGID;
 679         mark_inode_dirty(inode);
 680
 681         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 682         if (!fi) {
 683                 inode->i_nlink = 0;
 684                 mark_inode_dirty(inode);
 685                 iput(inode);
 686                 goto out;
 687         }
 688         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 689         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 690         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 691                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 692         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 693         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 694         inc_nlink(dir);
 695         mark_inode_dirty(dir);
 696         d_instantiate(dentry, inode);
 697         if (fibh.sbh != fibh.ebh)
 698                 brelse(fibh.ebh);
 699         brelse(fibh.sbh);
 700         err = 0;
 701
 702 out:
 703         unlock_kernel();
 704         return err;
 705 }
 706
 707 static int empty_dir(struct inode *dir)
 708 {
 709         struct fileIdentDesc *fi, cfi;
 710         struct udf_fileident_bh fibh;
 711         loff_t f_pos;
 712         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 713         int block;
 714         kernel_lb_addr eloc;
 715         uint32_t elen;
 716         sector_t offset;
 717         struct extent_position epos = {};
 718         struct udf_inode_info *dinfo = UDF_I(dir);
 719
 720         f_pos = udf_ext0_offset(dir);
 721         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 722
 723         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 724                 fibh.sbh = fibh.ebh = NULL;
 725         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 726                               &epos, &eloc, &elen, &offset) ==
 727                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 728                 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 729                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 730                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 731                                 epos.offset -= sizeof(short_ad);
 732                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 733                                 epos.offset -= sizeof(long_ad);
 734                 } else
 735                         offset = 0;
 736
 737                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 738                 if (!fibh.sbh) {
 739                         brelse(epos.bh);
 740                         return 0;
 741                 }
 742         } else {
 743                 brelse(epos.bh);
 744                 return 0;
 745         }
 746
 747         while (f_pos < size) {
 748                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 749                                         &elen, &offset);
 750                 if (!fi) {
 751                         if (fibh.sbh != fibh.ebh)
 752                                 brelse(fibh.ebh);
 753                         brelse(fibh.sbh);
 754                         brelse(epos.bh);
 755                         return 0;
 756                 }
 757
 758                 if (cfi.lengthFileIdent &&
 759                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 760                         if (fibh.sbh != fibh.ebh)
 761                                 brelse(fibh.ebh);
 762                         brelse(fibh.sbh);
 763                         brelse(epos.bh);
 764                         return 0;
 765                 }
 766         }
 767
 768         if (fibh.sbh != fibh.ebh)
 769                 brelse(fibh.ebh);
 770         brelse(fibh.sbh);
 771         brelse(epos.bh);
 772
 773         return 1;
 774 }
 775
 776 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 777 {
 778         int retval;
 779         struct inode *inode = dentry->d_inode;
 780         struct udf_fileident_bh fibh;
 781         struct fileIdentDesc *fi, cfi;
 782         kernel_lb_addr tloc;
 783
 784         retval = -ENOENT;
 785         lock_kernel();
 786         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 787         if (!fi)
 788                 goto out;
 789
 790         retval = -EIO;
 791         tloc = lelb_to_cpu(cfi.icb.extLocation);
 792         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 793                 goto end_rmdir;
 794         retval = -ENOTEMPTY;
 795         if (!empty_dir(inode))
 796                 goto end_rmdir;
 797         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 798         if (retval)
 799                 goto end_rmdir;
 800         if (inode->i_nlink != 2)
 801                 udf_warning(inode->i_sb, "udf_rmdir",
 802                             "empty directory has nlink != 2 (%d)",
 803                             inode->i_nlink);
 804         clear_nlink(inode);
 805         inode->i_size = 0;
 806         inode_dec_link_count(dir);
 807         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 808                                                 current_fs_time(dir->i_sb);
 809         mark_inode_dirty(dir);
 810
 811 end_rmdir:
 812         if (fibh.sbh != fibh.ebh)
 813                 brelse(fibh.ebh);
 814         brelse(fibh.sbh);
 815
 816 out:
 817         unlock_kernel();
 818         return retval;
 819 }
 820
 821 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 822 {
 823         int retval;
 824         struct inode *inode = dentry->d_inode;
 825         struct udf_fileident_bh fibh;
 826         struct fileIdentDesc *fi;
 827         struct fileIdentDesc cfi;
 828         kernel_lb_addr tloc;
 829
 830         retval = -ENOENT;
 831         lock_kernel();
 832         fi = udf_find_entry(dir, dentry, &fibh, &cfi);
 833         if (!fi)
 834                 goto out;
 835
 836         retval = -EIO;
 837         tloc = lelb_to_cpu(cfi.icb.extLocation);
 838         if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
 839                 goto end_unlink;
 840
 841         if (!inode->i_nlink) {
 842                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 843                           inode->i_ino, inode->i_nlink);
 844                 inode->i_nlink = 1;
 845         }
 846         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 847         if (retval)
 848                 goto end_unlink;
 849         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 850         mark_inode_dirty(dir);
 851         inode_dec_link_count(inode);
 852         inode->i_ctime = dir->i_ctime;
 853         retval = 0;
 854
 855 end_unlink:
 856         if (fibh.sbh != fibh.ebh)
 857                 brelse(fibh.ebh);
 858         brelse(fibh.sbh);
 859
 860 out:
 861         unlock_kernel();
 862         return retval;
 863 }
 864
 865 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 866                        const char *symname)
 867 {
 868         struct inode *inode;
 869         struct pathComponent *pc;
 870         char *compstart;
 871         struct udf_fileident_bh fibh;
 872         struct extent_position epos = {};
 873         int eoffset, elen = 0;
 874         struct fileIdentDesc *fi;
 875         struct fileIdentDesc cfi;
 876         char *ea;
 877         int err;
 878         int block;
 879         char *name = NULL;
 880         int namelen;
 881         struct buffer_head *bh;
 882         struct udf_inode_info *iinfo;
 883
 884         lock_kernel();
 885         inode = udf_new_inode(dir, S_IFLNK, &err);
 886         if (!inode)
 887                 goto out;
 888
 889         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 890         if (!name) {
 891                 err = -ENOMEM;
 892                 goto out_no_entry;
 893         }
 894
 895         iinfo = UDF_I(inode);
 896         inode->i_mode = S_IFLNK | S_IRWXUGO;
 897         inode->i_data.a_ops = &udf_symlink_aops;
 898         inode->i_op = &page_symlink_inode_operations;
 899
 900         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 901                 kernel_lb_addr eloc;
 902                 uint32_t bsize;
 903
 904                 block = udf_new_block(inode->i_sb, inode,
 905                                 iinfo->i_location.partitionReferenceNum,
 906                                 iinfo->i_location.logicalBlockNum, &err);
 907                 if (!block)
 908                         goto out_no_entry;
 909                 epos.block = iinfo->i_location;
 910                 epos.offset = udf_file_entry_alloc_offset(inode);
 911                 epos.bh = NULL;
 912                 eloc.logicalBlockNum = block;
 913                 eloc.partitionReferenceNum =
 914                                 iinfo->i_location.partitionReferenceNum;
 915                 bsize = inode->i_sb->s_blocksize;
 916                 iinfo->i_lenExtents = bsize;
 917                 udf_add_aext(inode, &epos, eloc, bsize, 0);
 918                 brelse(epos.bh);
 919
 920                 block = udf_get_pblock(inode->i_sb, block,
 921                                 iinfo->i_location.partitionReferenceNum,
 922                                 0);
 923                 epos.bh = udf_tread(inode->i_sb, block);
 924                 lock_buffer(epos.bh);
 925                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
 926                 set_buffer_uptodate(epos.bh);
 927                 unlock_buffer(epos.bh);
 928                 mark_buffer_dirty_inode(epos.bh, inode);
 929                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 930         } else
 931                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 932
 933         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
 934         pc = (struct pathComponent *)ea;
 935
 936         if (*symname == '/') {
 937                 do {
 938                         symname++;
 939                 } while (*symname == '/');
 940
 941                 pc->componentType = 1;
 942                 pc->lengthComponentIdent = 0;
 943                 pc->componentFileVersionNum = 0;
 944                 pc += sizeof(struct pathComponent);
 945                 elen += sizeof(struct pathComponent);
 946         }
 947
 948         err = -ENAMETOOLONG;
 949
 950         while (*symname) {
 951                 if (elen + sizeof(struct pathComponent) > eoffset)
 952                         goto out_no_entry;
 953
 954                 pc = (struct pathComponent *)(ea + elen);
 955
 956                 compstart = (char *)symname;
 957
 958                 do {
 959                         symname++;
 960                 } while (*symname && *symname != '/');
 961
 962                 pc->componentType = 5;
 963                 pc->lengthComponentIdent = 0;
 964                 pc->componentFileVersionNum = 0;
 965                 if (compstart[0] == '.') {
 966                         if ((symname - compstart) == 1)
 967                                 pc->componentType = 4;
 968                         else if ((symname - compstart) == 2 &&
 969                                         compstart[1] == '.')
 970                                 pc->componentType = 3;
 971                 }
 972
 973                 if (pc->componentType == 5) {
 974                         namelen = udf_put_filename(inode->i_sb, compstart, name,
 975                                                    symname - compstart);
 976                         if (!namelen)
 977                                 goto out_no_entry;
 978
 979                         if (elen + sizeof(struct pathComponent) + namelen >
 980                                         eoffset)
 981                                 goto out_no_entry;
 982                         else
 983                                 pc->lengthComponentIdent = namelen;
 984
 985                         memcpy(pc->componentIdent, name, namelen);
 986                 }
 987
 988                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
 989
 990                 if (*symname) {
 991                         do {
 992                                 symname++;
 993                         } while (*symname == '/');
 994                 }
 995         }
 996
 997         brelse(epos.bh);
 998         inode->i_size = elen;
 999         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1000                 iinfo->i_lenAlloc = inode->i_size;
1001         mark_inode_dirty(inode);
1002
1003         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1004         if (!fi)
1005                 goto out_no_entry;
1006         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1007         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1008         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1009         if (bh) {
1010                 struct logicalVolIntegrityDesc *lvid =
1011                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1012                 struct logicalVolHeaderDesc *lvhd;
1013                 uint64_t uniqueID;
1014                 lvhd = (struct logicalVolHeaderDesc *)
1015                                 lvid->logicalVolContentsUse;
1016                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1017                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1018                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1019                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1020                         uniqueID += 16;
1021                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1022                 mark_buffer_dirty(bh);
1023         }
1024         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1025         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1026                 mark_inode_dirty(dir);
1027         if (fibh.sbh != fibh.ebh)
1028                 brelse(fibh.ebh);
1029         brelse(fibh.sbh);
1030         d_instantiate(dentry, inode);
1031         err = 0;
1032
1033 out:
1034         kfree(name);
1035         unlock_kernel();
1036         return err;
1037
1038 out_no_entry:
1039         inode_dec_link_count(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 = old_dentry->d_inode;
1048         struct udf_fileident_bh fibh;
1049         struct fileIdentDesc cfi, *fi;
1050         int err;
1051         struct buffer_head *bh;
1052
1053         lock_kernel();
1054         if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1055                 unlock_kernel();
1056                 return -EMLINK;
1057         }
1058
1059         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1060         if (!fi) {
1061                 unlock_kernel();
1062                 return err;
1063         }
1064         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1065         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1066         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1067         if (bh) {
1068                 struct logicalVolIntegrityDesc *lvid =
1069                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1070                 struct logicalVolHeaderDesc *lvhd;
1071                 uint64_t uniqueID;
1072                 lvhd = (struct logicalVolHeaderDesc *)
1073                                 (lvid->logicalVolContentsUse);
1074                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1075                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1076                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1077                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1078                         uniqueID += 16;
1079                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1080                 mark_buffer_dirty(bh);
1081         }
1082         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1083         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1084                 mark_inode_dirty(dir);
1085
1086         if (fibh.sbh != fibh.ebh)
1087                 brelse(fibh.ebh);
1088         brelse(fibh.sbh);
1089         inc_nlink(inode);
1090         inode->i_ctime = current_fs_time(inode->i_sb);
1091         mark_inode_dirty(inode);
1092         atomic_inc(&inode->i_count);
1093         d_instantiate(dentry, inode);
1094         unlock_kernel();
1095
1096         return 0;
1097 }
1098
1099 /* Anybody can rename anything with this: the permission checks are left to the
1100  * higher-level routines.
1101  */
1102 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1103                       struct inode *new_dir, struct dentry *new_dentry)
1104 {
1105         struct inode *old_inode = old_dentry->d_inode;
1106         struct inode *new_inode = new_dentry->d_inode;
1107         struct udf_fileident_bh ofibh, nfibh;
1108         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1109         struct fileIdentDesc ocfi, ncfi;
1110         struct buffer_head *dir_bh = NULL;
1111         int retval = -ENOENT;
1112         kernel_lb_addr tloc;
1113         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1114
1115         lock_kernel();
1116         ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1117         if (ofi) {
1118                 if (ofibh.sbh != ofibh.ebh)
1119                         brelse(ofibh.ebh);
1120                 brelse(ofibh.sbh);
1121         }
1122         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1123         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
1124             != old_inode->i_ino)
1125                 goto end_rename;
1126
1127         nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
1128         if (nfi) {
1129                 if (!new_inode) {
1130                         if (nfibh.sbh != nfibh.ebh)
1131                                 brelse(nfibh.ebh);
1132                         brelse(nfibh.sbh);
1133                         nfi = NULL;
1134                 }
1135         }
1136         if (S_ISDIR(old_inode->i_mode)) {
1137                 int offset = udf_ext0_offset(old_inode);
1138
1139                 if (new_inode) {
1140                         retval = -ENOTEMPTY;
1141                         if (!empty_dir(new_inode))
1142                                 goto end_rename;
1143                 }
1144                 retval = -EIO;
1145                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1146                         dir_fi = udf_get_fileident(
1147                                         old_iinfo->i_ext.i_data -
1148                                           (old_iinfo->i_efe ?
1149                                            sizeof(struct extendedFileEntry) :
1150                                            sizeof(struct fileEntry)),
1151                                         old_inode->i_sb->s_blocksize, &offset);
1152                 } else {
1153                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1154                         if (!dir_bh)
1155                                 goto end_rename;
1156                         dir_fi = udf_get_fileident(dir_bh->b_data,
1157                                         old_inode->i_sb->s_blocksize, &offset);
1158                 }
1159                 if (!dir_fi)
1160                         goto end_rename;
1161                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1162                 if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0) !=
1163                                 old_dir->i_ino)
1164                         goto end_rename;
1165
1166                 retval = -EMLINK;
1167                 if (!new_inode &&
1168                         new_dir->i_nlink >=
1169                                 (256 << sizeof(new_dir->i_nlink)) - 1)
1170                         goto end_rename;
1171         }
1172         if (!nfi) {
1173                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1174                                     &retval);
1175                 if (!nfi)
1176                         goto end_rename;
1177         }
1178
1179         /*
1180          * Like most other Unix systems, set the ctime for inodes on a
1181          * rename.
1182          */
1183         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1184         mark_inode_dirty(old_inode);
1185
1186         /*
1187          * ok, that's it
1188          */
1189         ncfi.fileVersionNum = ocfi.fileVersionNum;
1190         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1191         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
1192         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1193
1194         /* The old fid may have moved - find it again */
1195         ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
1196         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1197
1198         if (new_inode) {
1199                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1200                 inode_dec_link_count(new_inode);
1201         }
1202         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1203         mark_inode_dirty(old_dir);
1204
1205         if (dir_fi) {
1206                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1207                 udf_update_tag((char *)dir_fi,
1208                                 (sizeof(struct fileIdentDesc) +
1209                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1210                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1211                         mark_inode_dirty(old_inode);
1212                 else
1213                         mark_buffer_dirty_inode(dir_bh, old_inode);
1214
1215                 inode_dec_link_count(old_dir);
1216                 if (new_inode)
1217                         inode_dec_link_count(new_inode);
1218                 else {
1219                         inc_nlink(new_dir);
1220                         mark_inode_dirty(new_dir);
1221                 }
1222         }
1223
1224         if (ofi) {
1225                 if (ofibh.sbh != ofibh.ebh)
1226                         brelse(ofibh.ebh);
1227                 brelse(ofibh.sbh);
1228         }
1229
1230         retval = 0;
1231
1232 end_rename:
1233         brelse(dir_bh);
1234         if (nfi) {
1235                 if (nfibh.sbh != nfibh.ebh)
1236                         brelse(nfibh.ebh);
1237                 brelse(nfibh.sbh);
1238         }
1239         unlock_kernel();
1240
1241         return retval;
1242 }
1243
1244 static struct dentry *udf_get_parent(struct dentry *child)
1245 {
1246         struct dentry *parent;
1247         struct inode *inode = NULL;
1248         struct dentry dotdot;
1249         struct fileIdentDesc cfi;
1250         struct udf_fileident_bh fibh;
1251
1252         dotdot.d_name.name = "..";
1253         dotdot.d_name.len = 2;
1254
1255         lock_kernel();
1256         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1257                 goto out_unlock;
1258
1259         if (fibh.sbh != fibh.ebh)
1260                 brelse(fibh.ebh);
1261         brelse(fibh.sbh);
1262
1263         inode = udf_iget(child->d_inode->i_sb,
1264                          lelb_to_cpu(cfi.icb.extLocation));
1265         if (!inode)
1266                 goto out_unlock;
1267         unlock_kernel();
1268
1269         parent = d_alloc_anon(inode);
1270         if (!parent) {
1271                 iput(inode);
1272                 parent = ERR_PTR(-ENOMEM);
1273         }
1274
1275         return parent;
1276 out_unlock:
1277         unlock_kernel();
1278         return ERR_PTR(-EACCES);
1279 }
1280
1281
1282 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1283                                         u16 partref, __u32 generation)
1284 {
1285         struct inode *inode;
1286         struct dentry *result;
1287         kernel_lb_addr loc;
1288
1289         if (block == 0)
1290                 return ERR_PTR(-ESTALE);
1291
1292         loc.logicalBlockNum = block;
1293         loc.partitionReferenceNum = partref;
1294         inode = udf_iget(sb, loc);
1295
1296         if (inode == NULL)
1297                 return ERR_PTR(-ENOMEM);
1298
1299         if (generation && inode->i_generation != generation) {
1300                 iput(inode);
1301                 return ERR_PTR(-ESTALE);
1302         }
1303         result = d_alloc_anon(inode);
1304         if (!result) {
1305                 iput(inode);
1306                 return ERR_PTR(-ENOMEM);
1307         }
1308         return result;
1309 }
1310
1311 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1312                                        struct fid *fid, int fh_len, int fh_type)
1313 {
1314         if ((fh_len != 3 && fh_len != 5) ||
1315             (fh_type != FILEID_UDF_WITH_PARENT &&
1316              fh_type != FILEID_UDF_WITHOUT_PARENT))
1317                 return NULL;
1318
1319         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1320                         fid->udf.generation);
1321 }
1322
1323 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1324                                        struct fid *fid, int fh_len, int fh_type)
1325 {
1326         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1327                 return NULL;
1328
1329         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1330                                  fid->udf.parent_partref,
1331                                  fid->udf.parent_generation);
1332 }
1333 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1334                          int connectable)
1335 {
1336         int len = *lenp;
1337         struct inode *inode =  de->d_inode;
1338         kernel_lb_addr location = UDF_I(inode)->i_location;
1339         struct fid *fid = (struct fid *)fh;
1340         int type = FILEID_UDF_WITHOUT_PARENT;
1341
1342         if (len < 3 || (connectable && len < 5))
1343                 return 255;
1344
1345         *lenp = 3;
1346         fid->udf.block = location.logicalBlockNum;
1347         fid->udf.partref = location.partitionReferenceNum;
1348         fid->udf.generation = inode->i_generation;
1349
1350         if (connectable && !S_ISDIR(inode->i_mode)) {
1351                 spin_lock(&de->d_lock);
1352                 inode = de->d_parent->d_inode;
1353                 location = UDF_I(inode)->i_location;
1354                 fid->udf.parent_block = location.logicalBlockNum;
1355                 fid->udf.parent_partref = location.partitionReferenceNum;
1356                 fid->udf.parent_generation = inode->i_generation;
1357                 spin_unlock(&de->d_lock);
1358                 *lenp = 5;
1359                 type = FILEID_UDF_WITH_PARENT;
1360         }
1361
1362         return type;
1363 }
1364
1365 const struct export_operations udf_export_ops = {
1366         .encode_fh      = udf_encode_fh,
1367         .fh_to_dentry   = udf_fh_to_dentry,
1368         .fh_to_parent   = udf_fh_to_parent,
1369         .get_parent     = udf_get_parent,
1370 };
1371
1372 const struct inode_operations udf_dir_inode_operations = {
1373         .lookup                         = udf_lookup,
1374         .create                         = udf_create,
1375         .link                           = udf_link,
1376         .unlink                         = udf_unlink,
1377         .symlink                        = udf_symlink,
1378         .mkdir                          = udf_mkdir,
1379         .rmdir                          = udf_rmdir,
1380         .mknod                          = udf_mknod,
1381         .rename                         = udf_rename,
1382 };