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   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 unsigned char *name1, int len2,
  38                             const unsigned 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(struct 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(struct tag),
 103                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 104
 105         if (fibh->sbh == fibh->ebh) {
 106                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 107                               crclen + sizeof(struct 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(struct 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                                             const struct qstr *child,
 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         unsigned char *fname = NULL;
 153         unsigned char *nameptr;
 154         uint8_t lfi;
 155         uint16_t liu;
 156         loff_t size;
 157         struct 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 = child->len == 2 &&
 163                 child->name[0] == '.' && child->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(struct short_ad);
 178                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 179                                 epos.offset -= sizeof(struct 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, child->len, child->name))
 242                         goto out_ok;
 243         }
 244
 245 out_err:
 246         fi = NULL;
 247         if (fibh->sbh != fibh->ebh)
 248                 brelse(fibh->ebh);
 249         brelse(fibh->sbh);
 250 out_ok:
 251         brelse(epos.bh);
 252         kfree(fname);
 253
 254         return fi;
 255 }
 256
 257 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 258                                  struct nameidata *nd)
 259 {
 260         struct inode *inode = NULL;
 261         struct fileIdentDesc cfi;
 262         struct udf_fileident_bh fibh;
 263
 264         if (dentry->d_name.len > UDF_NAME_LEN - 2)
 265                 return ERR_PTR(-ENAMETOOLONG);
 266
 267         lock_kernel();
 268 #ifdef UDF_RECOVERY
 269         /* temporary shorthand for specifying files by inode number */
 270         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 271                 struct kernel_lb_addr lb = {
 272                         .logicalBlockNum = 0,
 273                         .partitionReferenceNum =
 274                                 simple_strtoul(dentry->d_name.name + 3,
 275                                                 NULL, 0),
 276                 };
 277                 inode = udf_iget(dir->i_sb, lb);
 278                 if (!inode) {
 279                         unlock_kernel();
 280                         return ERR_PTR(-EACCES);
 281                 }
 282         } else
 283 #endif /* UDF_RECOVERY */
 284
 285         if (udf_find_entry(dir, &dentry->d_name, &fibh, &cfi)) {
 286                 struct kernel_lb_addr loc;
 287
 288                 if (fibh.sbh != fibh.ebh)
 289                         brelse(fibh.ebh);
 290                 brelse(fibh.sbh);
 291
 292                 loc = lelb_to_cpu(cfi.icb.extLocation);
 293                 inode = udf_iget(dir->i_sb, &loc);
 294                 if (!inode) {
 295                         unlock_kernel();
 296                         return ERR_PTR(-EACCES);
 297                 }
 298         }
 299         unlock_kernel();
 300
 301         return d_splice_alias(inode, dentry);
 302 }
 303
 304 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 305                                            struct dentry *dentry,
 306                                            struct udf_fileident_bh *fibh,
 307                                            struct fileIdentDesc *cfi, int *err)
 308 {
 309         struct super_block *sb = dir->i_sb;
 310         struct fileIdentDesc *fi = NULL;
 311         unsigned char *name = NULL;
 312         int namelen;
 313         loff_t f_pos;
 314         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 315         int nfidlen;
 316         uint8_t lfi;
 317         uint16_t liu;
 318         int block;
 319         struct kernel_lb_addr eloc;
 320         uint32_t elen = 0;
 321         sector_t offset;
 322         struct extent_position epos = {};
 323         struct udf_inode_info *dinfo;
 324
 325         fibh->sbh = fibh->ebh = NULL;
 326         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 327         if (!name) {
 328                 *err = -ENOMEM;
 329                 goto out_err;
 330         }
 331
 332         if (dentry) {
 333                 if (!dentry->d_name.len) {
 334                         *err = -EINVAL;
 335                         goto out_err;
 336                 }
 337                 namelen = udf_put_filename(sb, dentry->d_name.name, name,
 338                                                  dentry->d_name.len);
 339                 if (!namelen) {
 340                         *err = -ENAMETOOLONG;
 341                         goto out_err;
 342                 }
 343         } else {
 344                 namelen = 0;
 345         }
 346
 347         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 348
 349         f_pos = udf_ext0_offset(dir);
 350
 351         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 352         dinfo = UDF_I(dir);
 353         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 354                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 355                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 356                         block = udf_get_lb_pblock(dir->i_sb,
 357                                         &dinfo->i_location, 0);
 358                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 359                         goto add;
 360                 }
 361                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 362                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 363                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 364                                 epos.offset -= sizeof(struct short_ad);
 365                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 366                                 epos.offset -= sizeof(struct long_ad);
 367                 } else
 368                         offset = 0;
 369
 370                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 371                 if (!fibh->sbh) {
 372                         *err = -EIO;
 373                         goto out_err;
 374                 }
 375
 376                 block = dinfo->i_location.logicalBlockNum;
 377         }
 378
 379         while (f_pos < size) {
 380                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 381                                         &elen, &offset);
 382
 383                 if (!fi) {
 384                         *err = -EIO;
 385                         goto out_err;
 386                 }
 387
 388                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 389                 lfi = cfi->lengthFileIdent;
 390
 391                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 392                         if (((sizeof(struct fileIdentDesc) +
 393                                         liu + lfi + 3) & ~3) == nfidlen) {
 394                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 395                                 cfi->fileVersionNum = cpu_to_le16(1);
 396                                 cfi->fileCharacteristics = 0;
 397                                 cfi->lengthFileIdent = namelen;
 398                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 399                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 400                                                   name))
 401                                         goto out_ok;
 402                                 else {
 403                                         *err = -EIO;
 404                                         goto out_err;
 405                                 }
 406                         }
 407                 }
 408         }
 409
 410 add:
 411         f_pos += nfidlen;
 412
 413         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 414             sb->s_blocksize - fibh->eoffset < nfidlen) {
 415                 brelse(epos.bh);
 416                 epos.bh = NULL;
 417                 fibh->soffset -= udf_ext0_offset(dir);
 418                 fibh->eoffset -= udf_ext0_offset(dir);
 419                 f_pos -= udf_ext0_offset(dir);
 420                 if (fibh->sbh != fibh->ebh)
 421                         brelse(fibh->ebh);
 422                 brelse(fibh->sbh);
 423                 fibh->sbh = fibh->ebh =
 424                                 udf_expand_dir_adinicb(dir, &block, err);
 425                 if (!fibh->sbh)
 426                         goto out_err;
 427                 epos.block = dinfo->i_location;
 428                 epos.offset = udf_file_entry_alloc_offset(dir);
 429                 /* Load extent udf_expand_dir_adinicb() has created */
 430                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 431         }
 432
 433         /* Entry fits into current block? */
 434         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 435                 fibh->soffset = fibh->eoffset;
 436                 fibh->eoffset += nfidlen;
 437                 if (fibh->sbh != fibh->ebh) {
 438                         brelse(fibh->sbh);
 439                         fibh->sbh = fibh->ebh;
 440                 }
 441
 442                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 443                         block = dinfo->i_location.logicalBlockNum;
 444                         fi = (struct fileIdentDesc *)
 445                                         (dinfo->i_ext.i_data +
 446                                          fibh->soffset -
 447                                          udf_ext0_offset(dir) +
 448                                          dinfo->i_lenEAttr);
 449                 } else {
 450                         block = eloc.logicalBlockNum +
 451                                         ((elen - 1) >>
 452                                                 dir->i_sb->s_blocksize_bits);
 453                         fi = (struct fileIdentDesc *)
 454                                 (fibh->sbh->b_data + fibh->soffset);
 455                 }
 456         } else {
 457                 /* Round up last extent in the file */
 458                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 459                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 460                         epos.offset -= sizeof(struct short_ad);
 461                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 462                         epos.offset -= sizeof(struct long_ad);
 463                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 464                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 465                                         - 1) & ~(sb->s_blocksize - 1);
 466
 467                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 468                 fibh->eoffset += nfidlen - sb->s_blocksize;
 469                 if (fibh->sbh != fibh->ebh) {
 470                         brelse(fibh->sbh);
 471                         fibh->sbh = fibh->ebh;
 472                 }
 473
 474                 block = eloc.logicalBlockNum + ((elen - 1) >>
 475                                                 dir->i_sb->s_blocksize_bits);
 476                 fibh->ebh = udf_bread(dir,
 477                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 478                 if (!fibh->ebh)
 479                         goto out_err;
 480
 481                 if (!fibh->soffset) {
 482                         if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 483                             (EXT_RECORDED_ALLOCATED >> 30)) {
 484                                 block = eloc.logicalBlockNum + ((elen - 1) >>
 485                                         dir->i_sb->s_blocksize_bits);
 486                         } else
 487                                 block++;
 488
 489                         brelse(fibh->sbh);
 490                         fibh->sbh = fibh->ebh;
 491                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 492                 } else {
 493                         fi = (struct fileIdentDesc *)
 494                                 (fibh->sbh->b_data + sb->s_blocksize +
 495                                         fibh->soffset);
 496                 }
 497         }
 498
 499         memset(cfi, 0, sizeof(struct fileIdentDesc));
 500         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 501                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 502                             sizeof(struct tag));
 503         else
 504                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 505                             sizeof(struct tag));
 506         cfi->fileVersionNum = cpu_to_le16(1);
 507         cfi->lengthFileIdent = namelen;
 508         cfi->lengthOfImpUse = cpu_to_le16(0);
 509         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 510                 dir->i_size += nfidlen;
 511                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 512                         dinfo->i_lenAlloc += nfidlen;
 513                 else {
 514                         /* Find the last extent and truncate it to proper size */
 515                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 516                                 (EXT_RECORDED_ALLOCATED >> 30))
 517                                 ;
 518                         elen -= dinfo->i_lenExtents - dir->i_size;
 519                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 520                                 epos.offset -= sizeof(struct short_ad);
 521                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 522                                 epos.offset -= sizeof(struct long_ad);
 523                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 524                         dinfo->i_lenExtents = dir->i_size;
 525                 }
 526
 527                 mark_inode_dirty(dir);
 528                 goto out_ok;
 529         } else {
 530                 *err = -EIO;
 531                 goto out_err;
 532         }
 533
 534 out_err:
 535         fi = NULL;
 536         if (fibh->sbh != fibh->ebh)
 537                 brelse(fibh->ebh);
 538         brelse(fibh->sbh);
 539 out_ok:
 540         brelse(epos.bh);
 541         kfree(name);
 542         return fi;
 543 }
 544
 545 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 546                             struct udf_fileident_bh *fibh,
 547                             struct fileIdentDesc *cfi)
 548 {
 549         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 550
 551         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 552                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 553
 554         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 555 }
 556
 557 static int udf_create(struct inode *dir, struct dentry *dentry, int mode,
 558                       struct nameidata *nd)
 559 {
 560         struct udf_fileident_bh fibh;
 561         struct inode *inode;
 562         struct fileIdentDesc cfi, *fi;
 563         int err;
 564         struct udf_inode_info *iinfo;
 565
 566         lock_kernel();
 567         inode = udf_new_inode(dir, mode, &err);
 568         if (!inode) {
 569                 unlock_kernel();
 570                 return err;
 571         }
 572
 573         iinfo = UDF_I(inode);
 574         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 575                 inode->i_data.a_ops = &udf_adinicb_aops;
 576         else
 577                 inode->i_data.a_ops = &udf_aops;
 578         inode->i_op = &udf_file_inode_operations;
 579         inode->i_fop = &udf_file_operations;
 580         inode->i_mode = mode;
 581         mark_inode_dirty(inode);
 582
 583         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 584         if (!fi) {
 585                 inode->i_nlink--;
 586                 mark_inode_dirty(inode);
 587                 iput(inode);
 588                 unlock_kernel();
 589                 return err;
 590         }
 591         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 592         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 593         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 594                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 595         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 596         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 597                 mark_inode_dirty(dir);
 598         if (fibh.sbh != fibh.ebh)
 599                 brelse(fibh.ebh);
 600         brelse(fibh.sbh);
 601         unlock_kernel();
 602         d_instantiate(dentry, inode);
 603
 604         return 0;
 605 }
 606
 607 static int udf_mknod(struct inode *dir, struct dentry *dentry, int mode,
 608                      dev_t rdev)
 609 {
 610         struct inode *inode;
 611         struct udf_fileident_bh fibh;
 612         struct fileIdentDesc cfi, *fi;
 613         int err;
 614         struct udf_inode_info *iinfo;
 615
 616         if (!old_valid_dev(rdev))
 617                 return -EINVAL;
 618
 619         lock_kernel();
 620         err = -EIO;
 621         inode = udf_new_inode(dir, mode, &err);
 622         if (!inode)
 623                 goto out;
 624
 625         iinfo = UDF_I(inode);
 626         inode->i_uid = current_fsuid();
 627         init_special_inode(inode, mode, rdev);
 628         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 629         if (!fi) {
 630                 inode->i_nlink--;
 631                 mark_inode_dirty(inode);
 632                 iput(inode);
 633                 unlock_kernel();
 634                 return err;
 635         }
 636         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 637         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 638         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 639                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 640         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 641         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 642                 mark_inode_dirty(dir);
 643         mark_inode_dirty(inode);
 644
 645         if (fibh.sbh != fibh.ebh)
 646                 brelse(fibh.ebh);
 647         brelse(fibh.sbh);
 648         d_instantiate(dentry, inode);
 649         err = 0;
 650
 651 out:
 652         unlock_kernel();
 653         return err;
 654 }
 655
 656 static int udf_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 657 {
 658         struct inode *inode;
 659         struct udf_fileident_bh fibh;
 660         struct fileIdentDesc cfi, *fi;
 661         int err;
 662         struct udf_inode_info *dinfo = UDF_I(dir);
 663         struct udf_inode_info *iinfo;
 664
 665         lock_kernel();
 666         err = -EMLINK;
 667         if (dir->i_nlink >= (256 << sizeof(dir->i_nlink)) - 1)
 668                 goto out;
 669
 670         err = -EIO;
 671         inode = udf_new_inode(dir, S_IFDIR, &err);
 672         if (!inode)
 673                 goto out;
 674
 675         iinfo = UDF_I(inode);
 676         inode->i_op = &udf_dir_inode_operations;
 677         inode->i_fop = &udf_dir_operations;
 678         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 679         if (!fi) {
 680                 inode->i_nlink--;
 681                 mark_inode_dirty(inode);
 682                 iput(inode);
 683                 goto out;
 684         }
 685         inode->i_nlink = 2;
 686         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 687         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 688         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 689                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 690         cfi.fileCharacteristics =
 691                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 692         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 693         brelse(fibh.sbh);
 694         inode->i_mode = S_IFDIR | mode;
 695         if (dir->i_mode & S_ISGID)
 696                 inode->i_mode |= S_ISGID;
 697         mark_inode_dirty(inode);
 698
 699         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 700         if (!fi) {
 701                 inode->i_nlink = 0;
 702                 mark_inode_dirty(inode);
 703                 iput(inode);
 704                 goto out;
 705         }
 706         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 707         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 708         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 709                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 710         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 711         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 712         inc_nlink(dir);
 713         mark_inode_dirty(dir);
 714         d_instantiate(dentry, inode);
 715         if (fibh.sbh != fibh.ebh)
 716                 brelse(fibh.ebh);
 717         brelse(fibh.sbh);
 718         err = 0;
 719
 720 out:
 721         unlock_kernel();
 722         return err;
 723 }
 724
 725 static int empty_dir(struct inode *dir)
 726 {
 727         struct fileIdentDesc *fi, cfi;
 728         struct udf_fileident_bh fibh;
 729         loff_t f_pos;
 730         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 731         int block;
 732         struct kernel_lb_addr eloc;
 733         uint32_t elen;
 734         sector_t offset;
 735         struct extent_position epos = {};
 736         struct udf_inode_info *dinfo = UDF_I(dir);
 737
 738         f_pos = udf_ext0_offset(dir);
 739         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 740
 741         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 742                 fibh.sbh = fibh.ebh = NULL;
 743         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 744                               &epos, &eloc, &elen, &offset) ==
 745                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 746                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 747                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 748                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 749                                 epos.offset -= sizeof(struct short_ad);
 750                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 751                                 epos.offset -= sizeof(struct long_ad);
 752                 } else
 753                         offset = 0;
 754
 755                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 756                 if (!fibh.sbh) {
 757                         brelse(epos.bh);
 758                         return 0;
 759                 }
 760         } else {
 761                 brelse(epos.bh);
 762                 return 0;
 763         }
 764
 765         while (f_pos < size) {
 766                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 767                                         &elen, &offset);
 768                 if (!fi) {
 769                         if (fibh.sbh != fibh.ebh)
 770                                 brelse(fibh.ebh);
 771                         brelse(fibh.sbh);
 772                         brelse(epos.bh);
 773                         return 0;
 774                 }
 775
 776                 if (cfi.lengthFileIdent &&
 777                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 778                         if (fibh.sbh != fibh.ebh)
 779                                 brelse(fibh.ebh);
 780                         brelse(fibh.sbh);
 781                         brelse(epos.bh);
 782                         return 0;
 783                 }
 784         }
 785
 786         if (fibh.sbh != fibh.ebh)
 787                 brelse(fibh.ebh);
 788         brelse(fibh.sbh);
 789         brelse(epos.bh);
 790
 791         return 1;
 792 }
 793
 794 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 795 {
 796         int retval;
 797         struct inode *inode = dentry->d_inode;
 798         struct udf_fileident_bh fibh;
 799         struct fileIdentDesc *fi, cfi;
 800         struct kernel_lb_addr tloc;
 801
 802         retval = -ENOENT;
 803         lock_kernel();
 804         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 805         if (!fi)
 806                 goto out;
 807
 808         retval = -EIO;
 809         tloc = lelb_to_cpu(cfi.icb.extLocation);
 810         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 811                 goto end_rmdir;
 812         retval = -ENOTEMPTY;
 813         if (!empty_dir(inode))
 814                 goto end_rmdir;
 815         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 816         if (retval)
 817                 goto end_rmdir;
 818         if (inode->i_nlink != 2)
 819                 udf_warning(inode->i_sb, "udf_rmdir",
 820                             "empty directory has nlink != 2 (%d)",
 821                             inode->i_nlink);
 822         clear_nlink(inode);
 823         inode->i_size = 0;
 824         inode_dec_link_count(dir);
 825         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 826                                                 current_fs_time(dir->i_sb);
 827         mark_inode_dirty(dir);
 828
 829 end_rmdir:
 830         if (fibh.sbh != fibh.ebh)
 831                 brelse(fibh.ebh);
 832         brelse(fibh.sbh);
 833
 834 out:
 835         unlock_kernel();
 836         return retval;
 837 }
 838
 839 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 840 {
 841         int retval;
 842         struct inode *inode = dentry->d_inode;
 843         struct udf_fileident_bh fibh;
 844         struct fileIdentDesc *fi;
 845         struct fileIdentDesc cfi;
 846         struct kernel_lb_addr tloc;
 847
 848         retval = -ENOENT;
 849         lock_kernel();
 850         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 851         if (!fi)
 852                 goto out;
 853
 854         retval = -EIO;
 855         tloc = lelb_to_cpu(cfi.icb.extLocation);
 856         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 857                 goto end_unlink;
 858
 859         if (!inode->i_nlink) {
 860                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 861                           inode->i_ino, inode->i_nlink);
 862                 inode->i_nlink = 1;
 863         }
 864         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 865         if (retval)
 866                 goto end_unlink;
 867         dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
 868         mark_inode_dirty(dir);
 869         inode_dec_link_count(inode);
 870         inode->i_ctime = dir->i_ctime;
 871         retval = 0;
 872
 873 end_unlink:
 874         if (fibh.sbh != fibh.ebh)
 875                 brelse(fibh.ebh);
 876         brelse(fibh.sbh);
 877
 878 out:
 879         unlock_kernel();
 880         return retval;
 881 }
 882
 883 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 884                        const char *symname)
 885 {
 886         struct inode *inode;
 887         struct pathComponent *pc;
 888         const char *compstart;
 889         struct udf_fileident_bh fibh;
 890         struct extent_position epos = {};
 891         int eoffset, elen = 0;
 892         struct fileIdentDesc *fi;
 893         struct fileIdentDesc cfi;
 894         uint8_t *ea;
 895         int err;
 896         int block;
 897         unsigned char *name = NULL;
 898         int namelen;
 899         struct buffer_head *bh;
 900         struct udf_inode_info *iinfo;
 901
 902         lock_kernel();
 903         inode = udf_new_inode(dir, S_IFLNK, &err);
 904         if (!inode)
 905                 goto out;
 906
 907         name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 908         if (!name) {
 909                 err = -ENOMEM;
 910                 goto out_no_entry;
 911         }
 912
 913         iinfo = UDF_I(inode);
 914         inode->i_mode = S_IFLNK | S_IRWXUGO;
 915         inode->i_data.a_ops = &udf_symlink_aops;
 916         inode->i_op = &page_symlink_inode_operations;
 917
 918         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 919                 struct kernel_lb_addr eloc;
 920                 uint32_t bsize;
 921
 922                 block = udf_new_block(inode->i_sb, inode,
 923                                 iinfo->i_location.partitionReferenceNum,
 924                                 iinfo->i_location.logicalBlockNum, &err);
 925                 if (!block)
 926                         goto out_no_entry;
 927                 epos.block = iinfo->i_location;
 928                 epos.offset = udf_file_entry_alloc_offset(inode);
 929                 epos.bh = NULL;
 930                 eloc.logicalBlockNum = block;
 931                 eloc.partitionReferenceNum =
 932                                 iinfo->i_location.partitionReferenceNum;
 933                 bsize = inode->i_sb->s_blocksize;
 934                 iinfo->i_lenExtents = bsize;
 935                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 936                 brelse(epos.bh);
 937
 938                 block = udf_get_pblock(inode->i_sb, block,
 939                                 iinfo->i_location.partitionReferenceNum,
 940                                 0);
 941                 epos.bh = udf_tgetblk(inode->i_sb, block);
 942                 lock_buffer(epos.bh);
 943                 memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
 944                 set_buffer_uptodate(epos.bh);
 945                 unlock_buffer(epos.bh);
 946                 mark_buffer_dirty_inode(epos.bh, inode);
 947                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 948         } else
 949                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 950
 951         eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
 952         pc = (struct pathComponent *)ea;
 953
 954         if (*symname == '/') {
 955                 do {
 956                         symname++;
 957                 } while (*symname == '/');
 958
 959                 pc->componentType = 1;
 960                 pc->lengthComponentIdent = 0;
 961                 pc->componentFileVersionNum = 0;
 962                 elen += sizeof(struct pathComponent);
 963         }
 964
 965         err = -ENAMETOOLONG;
 966
 967         while (*symname) {
 968                 if (elen + sizeof(struct pathComponent) > eoffset)
 969                         goto out_no_entry;
 970
 971                 pc = (struct pathComponent *)(ea + elen);
 972
 973                 compstart = symname;
 974
 975                 do {
 976                         symname++;
 977                 } while (*symname && *symname != '/');
 978
 979                 pc->componentType = 5;
 980                 pc->lengthComponentIdent = 0;
 981                 pc->componentFileVersionNum = 0;
 982                 if (compstart[0] == '.') {
 983                         if ((symname - compstart) == 1)
 984                                 pc->componentType = 4;
 985                         else if ((symname - compstart) == 2 &&
 986                                         compstart[1] == '.')
 987                                 pc->componentType = 3;
 988                 }
 989
 990                 if (pc->componentType == 5) {
 991                         namelen = udf_put_filename(inode->i_sb, compstart, name,
 992                                                    symname - compstart);
 993                         if (!namelen)
 994                                 goto out_no_entry;
 995
 996                         if (elen + sizeof(struct pathComponent) + namelen >
 997                                         eoffset)
 998                                 goto out_no_entry;
 999                         else
1000                                 pc->lengthComponentIdent = namelen;
1001
1002                         memcpy(pc->componentIdent, name, namelen);
1003                 }
1004
1005                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1006
1007                 if (*symname) {
1008                         do {
1009                                 symname++;
1010                         } while (*symname == '/');
1011                 }
1012         }
1013
1014         brelse(epos.bh);
1015         inode->i_size = elen;
1016         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1017                 iinfo->i_lenAlloc = inode->i_size;
1018         else
1019                 udf_truncate_tail_extent(inode);
1020         mark_inode_dirty(inode);
1021
1022         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1023         if (!fi)
1024                 goto out_no_entry;
1025         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1026         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
1027         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1028         if (bh) {
1029                 struct logicalVolIntegrityDesc *lvid =
1030                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1031                 struct logicalVolHeaderDesc *lvhd;
1032                 uint64_t uniqueID;
1033                 lvhd = (struct logicalVolHeaderDesc *)
1034                                 lvid->logicalVolContentsUse;
1035                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1036                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1037                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1038                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1039                         uniqueID += 16;
1040                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1041                 mark_buffer_dirty(bh);
1042         }
1043         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1044         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1045                 mark_inode_dirty(dir);
1046         if (fibh.sbh != fibh.ebh)
1047                 brelse(fibh.ebh);
1048         brelse(fibh.sbh);
1049         d_instantiate(dentry, inode);
1050         err = 0;
1051
1052 out:
1053         kfree(name);
1054         unlock_kernel();
1055         return err;
1056
1057 out_no_entry:
1058         inode_dec_link_count(inode);
1059         iput(inode);
1060         goto out;
1061 }
1062
1063 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1064                     struct dentry *dentry)
1065 {
1066         struct inode *inode = old_dentry->d_inode;
1067         struct udf_fileident_bh fibh;
1068         struct fileIdentDesc cfi, *fi;
1069         int err;
1070         struct buffer_head *bh;
1071
1072         lock_kernel();
1073         if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
1074                 unlock_kernel();
1075                 return -EMLINK;
1076         }
1077
1078         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1079         if (!fi) {
1080                 unlock_kernel();
1081                 return err;
1082         }
1083         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1084         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1085         bh = UDF_SB(inode->i_sb)->s_lvid_bh;
1086         if (bh) {
1087                 struct logicalVolIntegrityDesc *lvid =
1088                                 (struct logicalVolIntegrityDesc *)bh->b_data;
1089                 struct logicalVolHeaderDesc *lvhd;
1090                 uint64_t uniqueID;
1091                 lvhd = (struct logicalVolHeaderDesc *)
1092                                 (lvid->logicalVolContentsUse);
1093                 uniqueID = le64_to_cpu(lvhd->uniqueID);
1094                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1095                         cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
1096                 if (!(++uniqueID & 0x00000000FFFFFFFFUL))
1097                         uniqueID += 16;
1098                 lvhd->uniqueID = cpu_to_le64(uniqueID);
1099                 mark_buffer_dirty(bh);
1100         }
1101         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1102         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1103                 mark_inode_dirty(dir);
1104
1105         if (fibh.sbh != fibh.ebh)
1106                 brelse(fibh.ebh);
1107         brelse(fibh.sbh);
1108         inc_nlink(inode);
1109         inode->i_ctime = current_fs_time(inode->i_sb);
1110         mark_inode_dirty(inode);
1111         atomic_inc(&inode->i_count);
1112         d_instantiate(dentry, inode);
1113         unlock_kernel();
1114
1115         return 0;
1116 }
1117
1118 /* Anybody can rename anything with this: the permission checks are left to the
1119  * higher-level routines.
1120  */
1121 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1122                       struct inode *new_dir, struct dentry *new_dentry)
1123 {
1124         struct inode *old_inode = old_dentry->d_inode;
1125         struct inode *new_inode = new_dentry->d_inode;
1126         struct udf_fileident_bh ofibh, nfibh;
1127         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1128         struct fileIdentDesc ocfi, ncfi;
1129         struct buffer_head *dir_bh = NULL;
1130         int retval = -ENOENT;
1131         struct kernel_lb_addr tloc;
1132         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1133
1134         lock_kernel();
1135         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1136         if (ofi) {
1137                 if (ofibh.sbh != ofibh.ebh)
1138                         brelse(ofibh.ebh);
1139                 brelse(ofibh.sbh);
1140         }
1141         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1142         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1143             != old_inode->i_ino)
1144                 goto end_rename;
1145
1146         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1147         if (nfi) {
1148                 if (!new_inode) {
1149                         if (nfibh.sbh != nfibh.ebh)
1150                                 brelse(nfibh.ebh);
1151                         brelse(nfibh.sbh);
1152                         nfi = NULL;
1153                 }
1154         }
1155         if (S_ISDIR(old_inode->i_mode)) {
1156                 int offset = udf_ext0_offset(old_inode);
1157
1158                 if (new_inode) {
1159                         retval = -ENOTEMPTY;
1160                         if (!empty_dir(new_inode))
1161                                 goto end_rename;
1162                 }
1163                 retval = -EIO;
1164                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1165                         dir_fi = udf_get_fileident(
1166                                         old_iinfo->i_ext.i_data -
1167                                           (old_iinfo->i_efe ?
1168                                            sizeof(struct extendedFileEntry) :
1169                                            sizeof(struct fileEntry)),
1170                                         old_inode->i_sb->s_blocksize, &offset);
1171                 } else {
1172                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1173                         if (!dir_bh)
1174                                 goto end_rename;
1175                         dir_fi = udf_get_fileident(dir_bh->b_data,
1176                                         old_inode->i_sb->s_blocksize, &offset);
1177                 }
1178                 if (!dir_fi)
1179                         goto end_rename;
1180                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1181                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1182                                 old_dir->i_ino)
1183                         goto end_rename;
1184
1185                 retval = -EMLINK;
1186                 if (!new_inode &&
1187                         new_dir->i_nlink >=
1188                                 (256 << sizeof(new_dir->i_nlink)) - 1)
1189                         goto end_rename;
1190         }
1191         if (!nfi) {
1192                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1193                                     &retval);
1194                 if (!nfi)
1195                         goto end_rename;
1196         }
1197
1198         /*
1199          * Like most other Unix systems, set the ctime for inodes on a
1200          * rename.
1201          */
1202         old_inode->i_ctime = current_fs_time(old_inode->i_sb);
1203         mark_inode_dirty(old_inode);
1204
1205         /*
1206          * ok, that's it
1207          */
1208         ncfi.fileVersionNum = ocfi.fileVersionNum;
1209         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1210         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1211         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1212
1213         /* The old fid may have moved - find it again */
1214         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1215         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1216
1217         if (new_inode) {
1218                 new_inode->i_ctime = current_fs_time(new_inode->i_sb);
1219                 inode_dec_link_count(new_inode);
1220         }
1221         old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
1222         mark_inode_dirty(old_dir);
1223
1224         if (dir_fi) {
1225                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1226                 udf_update_tag((char *)dir_fi,
1227                                 (sizeof(struct fileIdentDesc) +
1228                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1229                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1230                         mark_inode_dirty(old_inode);
1231                 else
1232                         mark_buffer_dirty_inode(dir_bh, old_inode);
1233
1234                 inode_dec_link_count(old_dir);
1235                 if (new_inode)
1236                         inode_dec_link_count(new_inode);
1237                 else {
1238                         inc_nlink(new_dir);
1239                         mark_inode_dirty(new_dir);
1240                 }
1241         }
1242
1243         if (ofi) {
1244                 if (ofibh.sbh != ofibh.ebh)
1245                         brelse(ofibh.ebh);
1246                 brelse(ofibh.sbh);
1247         }
1248
1249         retval = 0;
1250
1251 end_rename:
1252         brelse(dir_bh);
1253         if (nfi) {
1254                 if (nfibh.sbh != nfibh.ebh)
1255                         brelse(nfibh.ebh);
1256                 brelse(nfibh.sbh);
1257         }
1258         unlock_kernel();
1259
1260         return retval;
1261 }
1262
1263 static struct dentry *udf_get_parent(struct dentry *child)
1264 {
1265         struct kernel_lb_addr tloc;
1266         struct inode *inode = NULL;
1267         struct qstr dotdot = {.name = "..", .len = 2};
1268         struct fileIdentDesc cfi;
1269         struct udf_fileident_bh fibh;
1270
1271         lock_kernel();
1272         if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
1273                 goto out_unlock;
1274
1275         if (fibh.sbh != fibh.ebh)
1276                 brelse(fibh.ebh);
1277         brelse(fibh.sbh);
1278
1279         tloc = lelb_to_cpu(cfi.icb.extLocation);
1280         inode = udf_iget(child->d_inode->i_sb, &tloc);
1281         if (!inode)
1282                 goto out_unlock;
1283         unlock_kernel();
1284
1285         return d_obtain_alias(inode);
1286 out_unlock:
1287         unlock_kernel();
1288         return ERR_PTR(-EACCES);
1289 }
1290
1291
1292 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1293                                         u16 partref, __u32 generation)
1294 {
1295         struct inode *inode;
1296         struct kernel_lb_addr loc;
1297
1298         if (block == 0)
1299                 return ERR_PTR(-ESTALE);
1300
1301         loc.logicalBlockNum = block;
1302         loc.partitionReferenceNum = partref;
1303         inode = udf_iget(sb, &loc);
1304
1305         if (inode == NULL)
1306                 return ERR_PTR(-ENOMEM);
1307
1308         if (generation && inode->i_generation != generation) {
1309                 iput(inode);
1310                 return ERR_PTR(-ESTALE);
1311         }
1312         return d_obtain_alias(inode);
1313 }
1314
1315 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1316                                        struct fid *fid, int fh_len, int fh_type)
1317 {
1318         if ((fh_len != 3 && fh_len != 5) ||
1319             (fh_type != FILEID_UDF_WITH_PARENT &&
1320              fh_type != FILEID_UDF_WITHOUT_PARENT))
1321                 return NULL;
1322
1323         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1324                         fid->udf.generation);
1325 }
1326
1327 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1328                                        struct fid *fid, int fh_len, int fh_type)
1329 {
1330         if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
1331                 return NULL;
1332
1333         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1334                                  fid->udf.parent_partref,
1335                                  fid->udf.parent_generation);
1336 }
1337 static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
1338                          int connectable)
1339 {
1340         int len = *lenp;
1341         struct inode *inode =  de->d_inode;
1342         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1343         struct fid *fid = (struct fid *)fh;
1344         int type = FILEID_UDF_WITHOUT_PARENT;
1345
1346         if (len < 3 || (connectable && len < 5))
1347                 return 255;
1348
1349         *lenp = 3;
1350         fid->udf.block = location.logicalBlockNum;
1351         fid->udf.partref = location.partitionReferenceNum;
1352         fid->udf.generation = inode->i_generation;
1353
1354         if (connectable && !S_ISDIR(inode->i_mode)) {
1355                 spin_lock(&de->d_lock);
1356                 inode = de->d_parent->d_inode;
1357                 location = UDF_I(inode)->i_location;
1358                 fid->udf.parent_block = location.logicalBlockNum;
1359                 fid->udf.parent_partref = location.partitionReferenceNum;
1360                 fid->udf.parent_generation = inode->i_generation;
1361                 spin_unlock(&de->d_lock);
1362                 *lenp = 5;
1363                 type = FILEID_UDF_WITH_PARENT;
1364         }
1365
1366         return type;
1367 }
1368
1369 const struct export_operations udf_export_ops = {
1370         .encode_fh      = udf_encode_fh,
1371         .fh_to_dentry   = udf_fh_to_dentry,
1372         .fh_to_parent   = udf_fh_to_parent,
1373         .get_parent     = udf_get_parent,
1374 };
1375
1376 const struct inode_operations udf_dir_inode_operations = {
1377         .lookup                         = udf_lookup,
1378         .create                         = udf_create,
1379         .link                           = udf_link,
1380         .unlink                         = udf_unlink,
1381         .symlink                        = udf_symlink,
1382         .mkdir                          = udf_mkdir,
1383         .rmdir                          = udf_rmdir,
1384         .mknod                          = udf_mknod,
1385         .rename                         = udf_rename,
1386 };