fs/udf/namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2004 Ben Fennema
  14  *  (C) 1999-2000 Stelias Computing Inc
  15  *
  16  * HISTORY
  17  *
  18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  19  *  04/19/99 blf  link, mknod, symlink support
  20  */
  21
  22 #include "udfdecl.h"
  23
  24 #include "udf_i.h"
  25 #include "udf_sb.h"
  26 #include <linux/string.h>
  27 #include <linux/errno.h>
  28 #include <linux/mm.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched.h>
  31 #include <linux/crc-itu-t.h>
  32 #include <linux/exportfs.h>
  33
  34 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  35                             const unsigned char *name2)
  36 {
  37         if (len1 != len2)
  38                 return 0;
  39
  40         return !memcmp(name1, name2, len1);
  41 }
  42
  43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  44                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  45                  uint8_t *impuse, uint8_t *fileident)
  46 {
  47         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  48         uint16_t crc;
  49         int offset;
  50         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  51         uint8_t lfi = cfi->lengthFileIdent;
  52         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  53                 sizeof(struct fileIdentDesc);
  54         int adinicb = 0;
  55
  56         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  57                 adinicb = 1;
  58
  59         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  60
  61         if (impuse) {
  62                 if (adinicb || (offset + liu < 0)) {
  63                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  64                 } else if (offset >= 0) {
  65                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  66                 } else {
  67                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  68                         memcpy(fibh->ebh->b_data, impuse - offset,
  69                                 liu + offset);
  70                 }
  71         }
  72
  73         offset += liu;
  74
  75         if (fileident) {
  76                 if (adinicb || (offset + lfi < 0)) {
  77                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  78                 } else if (offset >= 0) {
  79                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  80                 } else {
  81                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  82                                 -offset);
  83                         memcpy(fibh->ebh->b_data, fileident - offset,
  84                                 lfi + offset);
  85                 }
  86         }
  87
  88         offset += lfi;
  89
  90         if (adinicb || (offset + padlen < 0)) {
  91                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  92         } else if (offset >= 0) {
  93                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  94         } else {
  95                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  96                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  97         }
  98
  99         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
 100                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 101
 102         if (fibh->sbh == fibh->ebh) {
 103                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 104                               crclen + sizeof(struct tag) -
 105                               sizeof(struct fileIdentDesc));
 106         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 107                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 108                                         sizeof(struct fileIdentDesc) +
 109                                         fibh->soffset,
 110                               crclen + sizeof(struct tag) -
 111                                         sizeof(struct fileIdentDesc));
 112         } else {
 113                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 114                               -fibh->soffset - sizeof(struct fileIdentDesc));
 115                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 116         }
 117
 118         cfi->descTag.descCRC = cpu_to_le16(crc);
 119         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 120         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 121
 122         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 123                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 124                         sizeof(struct fileIdentDesc));
 125         } else {
 126                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 127                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 128                        sizeof(struct fileIdentDesc) + fibh->soffset);
 129         }
 130
 131         if (adinicb) {
 132                 mark_inode_dirty(inode);
 133         } else {
 134                 if (fibh->sbh != fibh->ebh)
 135                         mark_buffer_dirty_inode(fibh->ebh, inode);
 136                 mark_buffer_dirty_inode(fibh->sbh, inode);
 137         }
 138         return 0;
 139 }
 140
 141 /**
 142  * udf_find_entry - find entry in given directory.
 143  *
 144  * @dir:        directory inode to search in
 145  * @child:      qstr of the name
 146  * @fibh:       buffer head / inode with file identifier descriptor we found
 147  * @cfi:        found file identifier descriptor with given name
 148  *
 149  * This function searches in the directory @dir for a file name @child. When
 150  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 151  * directories) containing the file identifier descriptor (FID). In that case
 152  * the function returns pointer to the FID in the buffer or inode - but note
 153  * that FID may be split among two buffers (blocks) so accessing it via that
 154  * pointer isn't easily possible. This pointer can be used only as an iterator
 155  * for other directory manipulation functions. For inspection of the FID @cfi
 156  * can be used - the found FID is copied there.
 157  *
 158  * Returns pointer to FID, NULL when nothing found, or error code.
 159  */
 160 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 161                                             const struct qstr *child,
 162                                             struct udf_fileident_bh *fibh,
 163                                             struct fileIdentDesc *cfi)
 164 {
 165         struct fileIdentDesc *fi = NULL;
 166         loff_t f_pos;
 167         udf_pblk_t block;
 168         int flen;
 169         unsigned char *fname = NULL, *copy_name = NULL;
 170         unsigned char *nameptr;
 171         uint8_t lfi;
 172         uint16_t liu;
 173         loff_t size;
 174         struct kernel_lb_addr eloc;
 175         uint32_t elen;
 176         sector_t offset;
 177         struct extent_position epos = {};
 178         struct udf_inode_info *dinfo = UDF_I(dir);
 179         int isdotdot = child->len == 2 &&
 180                 child->name[0] == '.' && child->name[1] == '.';
 181         struct super_block *sb = dir->i_sb;
 182
 183         size = udf_ext0_offset(dir) + dir->i_size;
 184         f_pos = udf_ext0_offset(dir);
 185
 186         fibh->sbh = fibh->ebh = NULL;
 187         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 188         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 189                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 190                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 191                         fi = ERR_PTR(-EIO);
 192                         goto out_err;
 193                 }
 194
 195                 block = udf_get_lb_pblock(sb, &eloc, offset);
 196                 if ((++offset << sb->s_blocksize_bits) < elen) {
 197                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 198                                 epos.offset -= sizeof(struct short_ad);
 199                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 200                                 epos.offset -= sizeof(struct long_ad);
 201                 } else
 202                         offset = 0;
 203
 204                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 205                 if (!fibh->sbh) {
 206                         fi = ERR_PTR(-EIO);
 207                         goto out_err;
 208                 }
 209         }
 210
 211         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 212         if (!fname) {
 213                 fi = ERR_PTR(-ENOMEM);
 214                 goto out_err;
 215         }
 216
 217         while (f_pos < size) {
 218                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 219                                         &elen, &offset);
 220                 if (!fi) {
 221                         fi = ERR_PTR(-EIO);
 222                         goto out_err;
 223                 }
 224
 225                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 226                 lfi = cfi->lengthFileIdent;
 227
 228                 if (fibh->sbh == fibh->ebh) {
 229                         nameptr = fi->fileIdent + liu;
 230                 } else {
 231                         int poffset;    /* Unpaded ending offset */
 232
 233                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 234                                         liu + lfi;
 235
 236                         if (poffset >= lfi)
 237                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 238                                                       poffset - lfi);
 239                         else {
 240                                 if (!copy_name) {
 241                                         copy_name = kmalloc(UDF_NAME_LEN,
 242                                                             GFP_NOFS);
 243                                         if (!copy_name) {
 244                                                 fi = ERR_PTR(-ENOMEM);
 245                                                 goto out_err;
 246                                         }
 247                                 }
 248                                 nameptr = copy_name;
 249                                 memcpy(nameptr, fi->fileIdent + liu,
 250                                         lfi - poffset);
 251                                 memcpy(nameptr + lfi - poffset,
 252                                         fibh->ebh->b_data, poffset);
 253                         }
 254                 }
 255
 256                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 257                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 258                                 continue;
 259                 }
 260
 261                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 262                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                                 continue;
 264                 }
 265
 266                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 267                     isdotdot)
 268                         goto out_ok;
 269
 270                 if (!lfi)
 271                         continue;
 272
 273                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 274                 if (flen < 0) {
 275                         fi = ERR_PTR(flen);
 276                         goto out_err;
 277                 }
 278
 279                 if (udf_match(flen, fname, child->len, child->name))
 280                         goto out_ok;
 281         }
 282
 283         fi = NULL;
 284 out_err:
 285         if (fibh->sbh != fibh->ebh)
 286                 brelse(fibh->ebh);
 287         brelse(fibh->sbh);
 288 out_ok:
 289         brelse(epos.bh);
 290         kfree(fname);
 291         kfree(copy_name);
 292
 293         return fi;
 294 }
 295
 296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 297                                  unsigned int flags)
 298 {
 299         struct inode *inode = NULL;
 300         struct fileIdentDesc cfi;
 301         struct udf_fileident_bh fibh;
 302         struct fileIdentDesc *fi;
 303
 304         if (dentry->d_name.len > UDF_NAME_LEN)
 305                 return ERR_PTR(-ENAMETOOLONG);
 306
 307 #ifdef UDF_RECOVERY
 308         /* temporary shorthand for specifying files by inode number */
 309         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 310                 struct kernel_lb_addr lb = {
 311                         .logicalBlockNum = 0,
 312                         .partitionReferenceNum =
 313                                 simple_strtoul(dentry->d_name.name + 3,
 314                                                 NULL, 0),
 315                 };
 316                 inode = udf_iget(dir->i_sb, lb);
 317                 if (IS_ERR(inode))
 318                         return inode;
 319         } else
 320 #endif /* UDF_RECOVERY */
 321
 322         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 323         if (IS_ERR(fi))
 324                 return ERR_CAST(fi);
 325
 326         if (fi) {
 327                 struct kernel_lb_addr loc;
 328
 329                 if (fibh.sbh != fibh.ebh)
 330                         brelse(fibh.ebh);
 331                 brelse(fibh.sbh);
 332
 333                 loc = lelb_to_cpu(cfi.icb.extLocation);
 334                 inode = udf_iget(dir->i_sb, &loc);
 335                 if (IS_ERR(inode))
 336                         return ERR_CAST(inode);
 337         }
 338
 339         return d_splice_alias(inode, dentry);
 340 }
 341
 342 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 343                                            struct dentry *dentry,
 344                                            struct udf_fileident_bh *fibh,
 345                                            struct fileIdentDesc *cfi, int *err)
 346 {
 347         struct super_block *sb = dir->i_sb;
 348         struct fileIdentDesc *fi = NULL;
 349         unsigned char *name = NULL;
 350         int namelen;
 351         loff_t f_pos;
 352         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 353         int nfidlen;
 354         uint8_t lfi;
 355         uint16_t liu;
 356         udf_pblk_t block;
 357         struct kernel_lb_addr eloc;
 358         uint32_t elen = 0;
 359         sector_t offset;
 360         struct extent_position epos = {};
 361         struct udf_inode_info *dinfo;
 362
 363         fibh->sbh = fibh->ebh = NULL;
 364         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 365         if (!name) {
 366                 *err = -ENOMEM;
 367                 goto out_err;
 368         }
 369
 370         if (dentry) {
 371                 if (!dentry->d_name.len) {
 372                         *err = -EINVAL;
 373                         goto out_err;
 374                 }
 375                 namelen = udf_put_filename(sb, dentry->d_name.name,
 376                                            dentry->d_name.len,
 377                                            name, UDF_NAME_LEN_CS0);
 378                 if (!namelen) {
 379                         *err = -ENAMETOOLONG;
 380                         goto out_err;
 381                 }
 382         } else {
 383                 namelen = 0;
 384         }
 385
 386         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 387
 388         f_pos = udf_ext0_offset(dir);
 389
 390         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 391         dinfo = UDF_I(dir);
 392         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 393                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 394                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 395                         block = udf_get_lb_pblock(dir->i_sb,
 396                                         &dinfo->i_location, 0);
 397                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 398                         goto add;
 399                 }
 400                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 401                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 402                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 403                                 epos.offset -= sizeof(struct short_ad);
 404                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 405                                 epos.offset -= sizeof(struct long_ad);
 406                 } else
 407                         offset = 0;
 408
 409                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 410                 if (!fibh->sbh) {
 411                         *err = -EIO;
 412                         goto out_err;
 413                 }
 414
 415                 block = dinfo->i_location.logicalBlockNum;
 416         }
 417
 418         while (f_pos < size) {
 419                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 420                                         &elen, &offset);
 421
 422                 if (!fi) {
 423                         *err = -EIO;
 424                         goto out_err;
 425                 }
 426
 427                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 428                 lfi = cfi->lengthFileIdent;
 429
 430                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 431                         if (((sizeof(struct fileIdentDesc) +
 432                                         liu + lfi + 3) & ~3) == nfidlen) {
 433                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 434                                 cfi->fileVersionNum = cpu_to_le16(1);
 435                                 cfi->fileCharacteristics = 0;
 436                                 cfi->lengthFileIdent = namelen;
 437                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 438                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 439                                                   name))
 440                                         goto out_ok;
 441                                 else {
 442                                         *err = -EIO;
 443                                         goto out_err;
 444                                 }
 445                         }
 446                 }
 447         }
 448
 449 add:
 450         f_pos += nfidlen;
 451
 452         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 453             sb->s_blocksize - fibh->eoffset < nfidlen) {
 454                 brelse(epos.bh);
 455                 epos.bh = NULL;
 456                 fibh->soffset -= udf_ext0_offset(dir);
 457                 fibh->eoffset -= udf_ext0_offset(dir);
 458                 f_pos -= udf_ext0_offset(dir);
 459                 if (fibh->sbh != fibh->ebh)
 460                         brelse(fibh->ebh);
 461                 brelse(fibh->sbh);
 462                 fibh->sbh = fibh->ebh =
 463                                 udf_expand_dir_adinicb(dir, &block, err);
 464                 if (!fibh->sbh)
 465                         goto out_err;
 466                 epos.block = dinfo->i_location;
 467                 epos.offset = udf_file_entry_alloc_offset(dir);
 468                 /* Load extent udf_expand_dir_adinicb() has created */
 469                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 470         }
 471
 472         /* Entry fits into current block? */
 473         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 474                 fibh->soffset = fibh->eoffset;
 475                 fibh->eoffset += nfidlen;
 476                 if (fibh->sbh != fibh->ebh) {
 477                         brelse(fibh->sbh);
 478                         fibh->sbh = fibh->ebh;
 479                 }
 480
 481                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 482                         block = dinfo->i_location.logicalBlockNum;
 483                         fi = (struct fileIdentDesc *)
 484                                         (dinfo->i_ext.i_data +
 485                                          fibh->soffset -
 486                                          udf_ext0_offset(dir) +
 487                                          dinfo->i_lenEAttr);
 488                 } else {
 489                         block = eloc.logicalBlockNum +
 490                                         ((elen - 1) >>
 491                                                 dir->i_sb->s_blocksize_bits);
 492                         fi = (struct fileIdentDesc *)
 493                                 (fibh->sbh->b_data + fibh->soffset);
 494                 }
 495         } else {
 496                 /* Round up last extent in the file */
 497                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 498                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 499                         epos.offset -= sizeof(struct short_ad);
 500                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 501                         epos.offset -= sizeof(struct long_ad);
 502                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 503                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 504                                         - 1) & ~(sb->s_blocksize - 1);
 505
 506                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 507                 fibh->eoffset += nfidlen - sb->s_blocksize;
 508                 if (fibh->sbh != fibh->ebh) {
 509                         brelse(fibh->sbh);
 510                         fibh->sbh = fibh->ebh;
 511                 }
 512
 513                 block = eloc.logicalBlockNum + ((elen - 1) >>
 514                                                 dir->i_sb->s_blocksize_bits);
 515                 fibh->ebh = udf_bread(dir,
 516                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 517                 if (!fibh->ebh)
 518                         goto out_err;
 519                 /* Extents could have been merged, invalidate our position */
 520                 brelse(epos.bh);
 521                 epos.bh = NULL;
 522                 epos.block = dinfo->i_location;
 523                 epos.offset = udf_file_entry_alloc_offset(dir);
 524
 525                 if (!fibh->soffset) {
 526                         /* Find the freshly allocated block */
 527                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 528                                 (EXT_RECORDED_ALLOCATED >> 30))
 529                                 ;
 530                         block = eloc.logicalBlockNum + ((elen - 1) >>
 531                                         dir->i_sb->s_blocksize_bits);
 532                         brelse(fibh->sbh);
 533                         fibh->sbh = fibh->ebh;
 534                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 535                 } else {
 536                         fi = (struct fileIdentDesc *)
 537                                 (fibh->sbh->b_data + sb->s_blocksize +
 538                                         fibh->soffset);
 539                 }
 540         }
 541
 542         memset(cfi, 0, sizeof(struct fileIdentDesc));
 543         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 544                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 545                             sizeof(struct tag));
 546         else
 547                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 548                             sizeof(struct tag));
 549         cfi->fileVersionNum = cpu_to_le16(1);
 550         cfi->lengthFileIdent = namelen;
 551         cfi->lengthOfImpUse = cpu_to_le16(0);
 552         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 553                 dir->i_size += nfidlen;
 554                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 555                         dinfo->i_lenAlloc += nfidlen;
 556                 else {
 557                         /* Find the last extent and truncate it to proper size */
 558                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 559                                 (EXT_RECORDED_ALLOCATED >> 30))
 560                                 ;
 561                         elen -= dinfo->i_lenExtents - dir->i_size;
 562                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 563                                 epos.offset -= sizeof(struct short_ad);
 564                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 565                                 epos.offset -= sizeof(struct long_ad);
 566                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 567                         dinfo->i_lenExtents = dir->i_size;
 568                 }
 569
 570                 mark_inode_dirty(dir);
 571                 goto out_ok;
 572         } else {
 573                 *err = -EIO;
 574                 goto out_err;
 575         }
 576
 577 out_err:
 578         fi = NULL;
 579         if (fibh->sbh != fibh->ebh)
 580                 brelse(fibh->ebh);
 581         brelse(fibh->sbh);
 582 out_ok:
 583         brelse(epos.bh);
 584         kfree(name);
 585         return fi;
 586 }
 587
 588 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 589                             struct udf_fileident_bh *fibh,
 590                             struct fileIdentDesc *cfi)
 591 {
 592         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 593
 594         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 595                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 596
 597         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 598 }
 599
 600 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 601 {
 602         struct udf_inode_info *iinfo = UDF_I(inode);
 603         struct inode *dir = d_inode(dentry->d_parent);
 604         struct udf_fileident_bh fibh;
 605         struct fileIdentDesc cfi, *fi;
 606         int err;
 607
 608         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 609         if (unlikely(!fi)) {
 610                 inode_dec_link_count(inode);
 611                 unlock_new_inode(inode);
 612                 iput(inode);
 613                 return err;
 614         }
 615         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 616         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 617         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 618                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 619         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 620         dir->i_ctime = dir->i_mtime = current_time(dir);
 621         mark_inode_dirty(dir);
 622         if (fibh.sbh != fibh.ebh)
 623                 brelse(fibh.ebh);
 624         brelse(fibh.sbh);
 625         unlock_new_inode(inode);
 626         d_instantiate(dentry, inode);
 627
 628         return 0;
 629 }
 630
 631 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 632                       bool excl)
 633 {
 634         struct inode *inode = udf_new_inode(dir, mode);
 635
 636         if (IS_ERR(inode))
 637                 return PTR_ERR(inode);
 638
 639         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 640                 inode->i_data.a_ops = &udf_adinicb_aops;
 641         else
 642                 inode->i_data.a_ops = &udf_aops;
 643         inode->i_op = &udf_file_inode_operations;
 644         inode->i_fop = &udf_file_operations;
 645         mark_inode_dirty(inode);
 646
 647         return udf_add_nondir(dentry, inode);
 648 }
 649
 650 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 651 {
 652         struct inode *inode = udf_new_inode(dir, mode);
 653
 654         if (IS_ERR(inode))
 655                 return PTR_ERR(inode);
 656
 657         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 658                 inode->i_data.a_ops = &udf_adinicb_aops;
 659         else
 660                 inode->i_data.a_ops = &udf_aops;
 661         inode->i_op = &udf_file_inode_operations;
 662         inode->i_fop = &udf_file_operations;
 663         mark_inode_dirty(inode);
 664         d_tmpfile(dentry, inode);
 665         unlock_new_inode(inode);
 666         return 0;
 667 }
 668
 669 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 670                      dev_t rdev)
 671 {
 672         struct inode *inode;
 673
 674         if (!old_valid_dev(rdev))
 675                 return -EINVAL;
 676
 677         inode = udf_new_inode(dir, mode);
 678         if (IS_ERR(inode))
 679                 return PTR_ERR(inode);
 680
 681         init_special_inode(inode, mode, rdev);
 682         return udf_add_nondir(dentry, inode);
 683 }
 684
 685 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 686 {
 687         struct inode *inode;
 688         struct udf_fileident_bh fibh;
 689         struct fileIdentDesc cfi, *fi;
 690         int err;
 691         struct udf_inode_info *dinfo = UDF_I(dir);
 692         struct udf_inode_info *iinfo;
 693
 694         inode = udf_new_inode(dir, S_IFDIR | mode);
 695         if (IS_ERR(inode))
 696                 return PTR_ERR(inode);
 697
 698         iinfo = UDF_I(inode);
 699         inode->i_op = &udf_dir_inode_operations;
 700         inode->i_fop = &udf_dir_operations;
 701         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 702         if (!fi) {
 703                 inode_dec_link_count(inode);
 704                 unlock_new_inode(inode);
 705                 iput(inode);
 706                 goto out;
 707         }
 708         set_nlink(inode, 2);
 709         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 710         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 711         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 712                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 713         cfi.fileCharacteristics =
 714                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 715         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 716         brelse(fibh.sbh);
 717         mark_inode_dirty(inode);
 718
 719         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 720         if (!fi) {
 721                 clear_nlink(inode);
 722                 mark_inode_dirty(inode);
 723                 unlock_new_inode(inode);
 724                 iput(inode);
 725                 goto out;
 726         }
 727         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 728         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 729         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 730                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 731         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 732         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 733         inc_nlink(dir);
 734         dir->i_ctime = dir->i_mtime = current_time(dir);
 735         mark_inode_dirty(dir);
 736         unlock_new_inode(inode);
 737         d_instantiate(dentry, inode);
 738         if (fibh.sbh != fibh.ebh)
 739                 brelse(fibh.ebh);
 740         brelse(fibh.sbh);
 741         err = 0;
 742
 743 out:
 744         return err;
 745 }
 746
 747 static int empty_dir(struct inode *dir)
 748 {
 749         struct fileIdentDesc *fi, cfi;
 750         struct udf_fileident_bh fibh;
 751         loff_t f_pos;
 752         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 753         udf_pblk_t block;
 754         struct kernel_lb_addr eloc;
 755         uint32_t elen;
 756         sector_t offset;
 757         struct extent_position epos = {};
 758         struct udf_inode_info *dinfo = UDF_I(dir);
 759
 760         f_pos = udf_ext0_offset(dir);
 761         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 762
 763         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 764                 fibh.sbh = fibh.ebh = NULL;
 765         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 766                               &epos, &eloc, &elen, &offset) ==
 767                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 768                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 769                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 770                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 771                                 epos.offset -= sizeof(struct short_ad);
 772                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 773                                 epos.offset -= sizeof(struct long_ad);
 774                 } else
 775                         offset = 0;
 776
 777                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 778                 if (!fibh.sbh) {
 779                         brelse(epos.bh);
 780                         return 0;
 781                 }
 782         } else {
 783                 brelse(epos.bh);
 784                 return 0;
 785         }
 786
 787         while (f_pos < size) {
 788                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 789                                         &elen, &offset);
 790                 if (!fi) {
 791                         if (fibh.sbh != fibh.ebh)
 792                                 brelse(fibh.ebh);
 793                         brelse(fibh.sbh);
 794                         brelse(epos.bh);
 795                         return 0;
 796                 }
 797
 798                 if (cfi.lengthFileIdent &&
 799                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 800                         if (fibh.sbh != fibh.ebh)
 801                                 brelse(fibh.ebh);
 802                         brelse(fibh.sbh);
 803                         brelse(epos.bh);
 804                         return 0;
 805                 }
 806         }
 807
 808         if (fibh.sbh != fibh.ebh)
 809                 brelse(fibh.ebh);
 810         brelse(fibh.sbh);
 811         brelse(epos.bh);
 812
 813         return 1;
 814 }
 815
 816 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 817 {
 818         int retval;
 819         struct inode *inode = d_inode(dentry);
 820         struct udf_fileident_bh fibh;
 821         struct fileIdentDesc *fi, cfi;
 822         struct kernel_lb_addr tloc;
 823
 824         retval = -ENOENT;
 825         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 826         if (IS_ERR_OR_NULL(fi)) {
 827                 if (fi)
 828                         retval = PTR_ERR(fi);
 829                 goto out;
 830         }
 831
 832         retval = -EIO;
 833         tloc = lelb_to_cpu(cfi.icb.extLocation);
 834         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 835                 goto end_rmdir;
 836         retval = -ENOTEMPTY;
 837         if (!empty_dir(inode))
 838                 goto end_rmdir;
 839         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 840         if (retval)
 841                 goto end_rmdir;
 842         if (inode->i_nlink != 2)
 843                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 844                          inode->i_nlink);
 845         clear_nlink(inode);
 846         inode->i_size = 0;
 847         inode_dec_link_count(dir);
 848         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 849                                                 current_time(inode);
 850         mark_inode_dirty(dir);
 851
 852 end_rmdir:
 853         if (fibh.sbh != fibh.ebh)
 854                 brelse(fibh.ebh);
 855         brelse(fibh.sbh);
 856
 857 out:
 858         return retval;
 859 }
 860
 861 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 862 {
 863         int retval;
 864         struct inode *inode = d_inode(dentry);
 865         struct udf_fileident_bh fibh;
 866         struct fileIdentDesc *fi;
 867         struct fileIdentDesc cfi;
 868         struct kernel_lb_addr tloc;
 869
 870         retval = -ENOENT;
 871         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 872
 873         if (IS_ERR_OR_NULL(fi)) {
 874                 if (fi)
 875                         retval = PTR_ERR(fi);
 876                 goto out;
 877         }
 878
 879         retval = -EIO;
 880         tloc = lelb_to_cpu(cfi.icb.extLocation);
 881         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 882                 goto end_unlink;
 883
 884         if (!inode->i_nlink) {
 885                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 886                           inode->i_ino, inode->i_nlink);
 887                 set_nlink(inode, 1);
 888         }
 889         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 890         if (retval)
 891                 goto end_unlink;
 892         dir->i_ctime = dir->i_mtime = current_time(dir);
 893         mark_inode_dirty(dir);
 894         inode_dec_link_count(inode);
 895         inode->i_ctime = dir->i_ctime;
 896         retval = 0;
 897
 898 end_unlink:
 899         if (fibh.sbh != fibh.ebh)
 900                 brelse(fibh.ebh);
 901         brelse(fibh.sbh);
 902
 903 out:
 904         return retval;
 905 }
 906
 907 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 908                        const char *symname)
 909 {
 910         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 911         struct pathComponent *pc;
 912         const char *compstart;
 913         struct extent_position epos = {};
 914         int eoffset, elen = 0;
 915         uint8_t *ea;
 916         int err;
 917         udf_pblk_t block;
 918         unsigned char *name = NULL;
 919         int namelen;
 920         struct udf_inode_info *iinfo;
 921         struct super_block *sb = dir->i_sb;
 922
 923         if (IS_ERR(inode))
 924                 return PTR_ERR(inode);
 925
 926         iinfo = UDF_I(inode);
 927         down_write(&iinfo->i_data_sem);
 928         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 929         if (!name) {
 930                 err = -ENOMEM;
 931                 goto out_no_entry;
 932         }
 933
 934         inode->i_data.a_ops = &udf_symlink_aops;
 935         inode->i_op = &udf_symlink_inode_operations;
 936         inode_nohighmem(inode);
 937
 938         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 939                 struct kernel_lb_addr eloc;
 940                 uint32_t bsize;
 941
 942                 block = udf_new_block(sb, inode,
 943                                 iinfo->i_location.partitionReferenceNum,
 944                                 iinfo->i_location.logicalBlockNum, &err);
 945                 if (!block)
 946                         goto out_no_entry;
 947                 epos.block = iinfo->i_location;
 948                 epos.offset = udf_file_entry_alloc_offset(inode);
 949                 epos.bh = NULL;
 950                 eloc.logicalBlockNum = block;
 951                 eloc.partitionReferenceNum =
 952                                 iinfo->i_location.partitionReferenceNum;
 953                 bsize = sb->s_blocksize;
 954                 iinfo->i_lenExtents = bsize;
 955                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 956                 brelse(epos.bh);
 957
 958                 block = udf_get_pblock(sb, block,
 959                                 iinfo->i_location.partitionReferenceNum,
 960                                 0);
 961                 epos.bh = udf_tgetblk(sb, block);
 962                 lock_buffer(epos.bh);
 963                 memset(epos.bh->b_data, 0x00, bsize);
 964                 set_buffer_uptodate(epos.bh);
 965                 unlock_buffer(epos.bh);
 966                 mark_buffer_dirty_inode(epos.bh, inode);
 967                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 968         } else
 969                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 970
 971         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 972         pc = (struct pathComponent *)ea;
 973
 974         if (*symname == '/') {
 975                 do {
 976                         symname++;
 977                 } while (*symname == '/');
 978
 979                 pc->componentType = 1;
 980                 pc->lengthComponentIdent = 0;
 981                 pc->componentFileVersionNum = 0;
 982                 elen += sizeof(struct pathComponent);
 983         }
 984
 985         err = -ENAMETOOLONG;
 986
 987         while (*symname) {
 988                 if (elen + sizeof(struct pathComponent) > eoffset)
 989                         goto out_no_entry;
 990
 991                 pc = (struct pathComponent *)(ea + elen);
 992
 993                 compstart = symname;
 994
 995                 do {
 996                         symname++;
 997                 } while (*symname && *symname != '/');
 998
 999                 pc->componentType = 5;
1000                 pc->lengthComponentIdent = 0;
1001                 pc->componentFileVersionNum = 0;
1002                 if (compstart[0] == '.') {
1003                         if ((symname - compstart) == 1)
1004                                 pc->componentType = 4;
1005                         else if ((symname - compstart) == 2 &&
1006                                         compstart[1] == '.')
1007                                 pc->componentType = 3;
1008                 }
1009
1010                 if (pc->componentType == 5) {
1011                         namelen = udf_put_filename(sb, compstart,
1012                                                    symname - compstart,
1013                                                    name, UDF_NAME_LEN_CS0);
1014                         if (!namelen)
1015                                 goto out_no_entry;
1016
1017                         if (elen + sizeof(struct pathComponent) + namelen >
1018                                         eoffset)
1019                                 goto out_no_entry;
1020                         else
1021                                 pc->lengthComponentIdent = namelen;
1022
1023                         memcpy(pc->componentIdent, name, namelen);
1024                 }
1025
1026                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1027
1028                 if (*symname) {
1029                         do {
1030                                 symname++;
1031                         } while (*symname == '/');
1032                 }
1033         }
1034
1035         brelse(epos.bh);
1036         inode->i_size = elen;
1037         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1038                 iinfo->i_lenAlloc = inode->i_size;
1039         else
1040                 udf_truncate_tail_extent(inode);
1041         mark_inode_dirty(inode);
1042         up_write(&iinfo->i_data_sem);
1043
1044         err = udf_add_nondir(dentry, inode);
1045 out:
1046         kfree(name);
1047         return err;
1048
1049 out_no_entry:
1050         up_write(&iinfo->i_data_sem);
1051         inode_dec_link_count(inode);
1052         unlock_new_inode(inode);
1053         iput(inode);
1054         goto out;
1055 }
1056
1057 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1058                     struct dentry *dentry)
1059 {
1060         struct inode *inode = d_inode(old_dentry);
1061         struct udf_fileident_bh fibh;
1062         struct fileIdentDesc cfi, *fi;
1063         int err;
1064
1065         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1066         if (!fi) {
1067                 return err;
1068         }
1069         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1070         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1071         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1072                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1073                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1074         }
1075         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1076         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1077                 mark_inode_dirty(dir);
1078
1079         if (fibh.sbh != fibh.ebh)
1080                 brelse(fibh.ebh);
1081         brelse(fibh.sbh);
1082         inc_nlink(inode);
1083         inode->i_ctime = current_time(inode);
1084         mark_inode_dirty(inode);
1085         dir->i_ctime = dir->i_mtime = current_time(dir);
1086         mark_inode_dirty(dir);
1087         ihold(inode);
1088         d_instantiate(dentry, inode);
1089
1090         return 0;
1091 }
1092
1093 /* Anybody can rename anything with this: the permission checks are left to the
1094  * higher-level routines.
1095  */
1096 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1097                       struct inode *new_dir, struct dentry *new_dentry,
1098                       unsigned int flags)
1099 {
1100         struct inode *old_inode = d_inode(old_dentry);
1101         struct inode *new_inode = d_inode(new_dentry);
1102         struct udf_fileident_bh ofibh, nfibh;
1103         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1104         struct fileIdentDesc ocfi, ncfi;
1105         struct buffer_head *dir_bh = NULL;
1106         int retval = -ENOENT;
1107         struct kernel_lb_addr tloc;
1108         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1109
1110         if (flags & ~RENAME_NOREPLACE)
1111                 return -EINVAL;
1112
1113         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1114         if (IS_ERR(ofi)) {
1115                 retval = PTR_ERR(ofi);
1116                 goto end_rename;
1117         }
1118
1119         if (ofibh.sbh != ofibh.ebh)
1120                 brelse(ofibh.ebh);
1121
1122         brelse(ofibh.sbh);
1123         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1124         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1125             != old_inode->i_ino)
1126                 goto end_rename;
1127
1128         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1129         if (IS_ERR(nfi)) {
1130                 retval = PTR_ERR(nfi);
1131                 goto end_rename;
1132         }
1133         if (nfi && !new_inode) {
1134                 if (nfibh.sbh != nfibh.ebh)
1135                         brelse(nfibh.ebh);
1136                 brelse(nfibh.sbh);
1137                 nfi = NULL;
1138         }
1139         if (S_ISDIR(old_inode->i_mode)) {
1140                 int offset = udf_ext0_offset(old_inode);
1141
1142                 if (new_inode) {
1143                         retval = -ENOTEMPTY;
1144                         if (!empty_dir(new_inode))
1145                                 goto end_rename;
1146                 }
1147                 retval = -EIO;
1148                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1149                         dir_fi = udf_get_fileident(
1150                                         old_iinfo->i_ext.i_data -
1151                                           (old_iinfo->i_efe ?
1152                                            sizeof(struct extendedFileEntry) :
1153                                            sizeof(struct fileEntry)),
1154                                         old_inode->i_sb->s_blocksize, &offset);
1155                 } else {
1156                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1157                         if (!dir_bh)
1158                                 goto end_rename;
1159                         dir_fi = udf_get_fileident(dir_bh->b_data,
1160                                         old_inode->i_sb->s_blocksize, &offset);
1161                 }
1162                 if (!dir_fi)
1163                         goto end_rename;
1164                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1165                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1166                                 old_dir->i_ino)
1167                         goto end_rename;
1168         }
1169         if (!nfi) {
1170                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1171                                     &retval);
1172                 if (!nfi)
1173                         goto end_rename;
1174         }
1175
1176         /*
1177          * Like most other Unix systems, set the ctime for inodes on a
1178          * rename.
1179          */
1180         old_inode->i_ctime = current_time(old_inode);
1181         mark_inode_dirty(old_inode);
1182
1183         /*
1184          * ok, that's it
1185          */
1186         ncfi.fileVersionNum = ocfi.fileVersionNum;
1187         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1188         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1189         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1190
1191         /* The old fid may have moved - find it again */
1192         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1193         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1194
1195         if (new_inode) {
1196                 new_inode->i_ctime = current_time(new_inode);
1197                 inode_dec_link_count(new_inode);
1198         }
1199         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1200         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1201         mark_inode_dirty(old_dir);
1202         mark_inode_dirty(new_dir);
1203
1204         if (dir_fi) {
1205                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1206                 udf_update_tag((char *)dir_fi,
1207                                 (sizeof(struct fileIdentDesc) +
1208                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1209                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1210                         mark_inode_dirty(old_inode);
1211                 else
1212                         mark_buffer_dirty_inode(dir_bh, old_inode);
1213
1214                 inode_dec_link_count(old_dir);
1215                 if (new_inode)
1216                         inode_dec_link_count(new_inode);
1217                 else {
1218                         inc_nlink(new_dir);
1219                         mark_inode_dirty(new_dir);
1220                 }
1221         }
1222
1223         if (ofi) {
1224                 if (ofibh.sbh != ofibh.ebh)
1225                         brelse(ofibh.ebh);
1226                 brelse(ofibh.sbh);
1227         }
1228
1229         retval = 0;
1230
1231 end_rename:
1232         brelse(dir_bh);
1233         if (nfi) {
1234                 if (nfibh.sbh != nfibh.ebh)
1235                         brelse(nfibh.ebh);
1236                 brelse(nfibh.sbh);
1237         }
1238
1239         return retval;
1240 }
1241
1242 static struct dentry *udf_get_parent(struct dentry *child)
1243 {
1244         struct kernel_lb_addr tloc;
1245         struct inode *inode = NULL;
1246         struct qstr dotdot = QSTR_INIT("..", 2);
1247         struct fileIdentDesc cfi;
1248         struct udf_fileident_bh fibh;
1249
1250         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1251                 return ERR_PTR(-EACCES);
1252
1253         if (fibh.sbh != fibh.ebh)
1254                 brelse(fibh.ebh);
1255         brelse(fibh.sbh);
1256
1257         tloc = lelb_to_cpu(cfi.icb.extLocation);
1258         inode = udf_iget(child->d_sb, &tloc);
1259         if (IS_ERR(inode))
1260                 return ERR_CAST(inode);
1261
1262         return d_obtain_alias(inode);
1263 }
1264
1265
1266 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1267                                         u16 partref, __u32 generation)
1268 {
1269         struct inode *inode;
1270         struct kernel_lb_addr loc;
1271
1272         if (block == 0)
1273                 return ERR_PTR(-ESTALE);
1274
1275         loc.logicalBlockNum = block;
1276         loc.partitionReferenceNum = partref;
1277         inode = udf_iget(sb, &loc);
1278
1279         if (IS_ERR(inode))
1280                 return ERR_CAST(inode);
1281
1282         if (generation && inode->i_generation != generation) {
1283                 iput(inode);
1284                 return ERR_PTR(-ESTALE);
1285         }
1286         return d_obtain_alias(inode);
1287 }
1288
1289 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1290                                        struct fid *fid, int fh_len, int fh_type)
1291 {
1292         if (fh_len < 3 ||
1293             (fh_type != FILEID_UDF_WITH_PARENT &&
1294              fh_type != FILEID_UDF_WITHOUT_PARENT))
1295                 return NULL;
1296
1297         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1298                         fid->udf.generation);
1299 }
1300
1301 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1302                                        struct fid *fid, int fh_len, int fh_type)
1303 {
1304         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1305                 return NULL;
1306
1307         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1308                                  fid->udf.parent_partref,
1309                                  fid->udf.parent_generation);
1310 }
1311 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1312                          struct inode *parent)
1313 {
1314         int len = *lenp;
1315         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1316         struct fid *fid = (struct fid *)fh;
1317         int type = FILEID_UDF_WITHOUT_PARENT;
1318
1319         if (parent && (len < 5)) {
1320                 *lenp = 5;
1321                 return FILEID_INVALID;
1322         } else if (len < 3) {
1323                 *lenp = 3;
1324                 return FILEID_INVALID;
1325         }
1326
1327         *lenp = 3;
1328         fid->udf.block = location.logicalBlockNum;
1329         fid->udf.partref = location.partitionReferenceNum;
1330         fid->udf.parent_partref = 0;
1331         fid->udf.generation = inode->i_generation;
1332
1333         if (parent) {
1334                 location = UDF_I(parent)->i_location;
1335                 fid->udf.parent_block = location.logicalBlockNum;
1336                 fid->udf.parent_partref = location.partitionReferenceNum;
1337                 fid->udf.parent_generation = inode->i_generation;
1338                 *lenp = 5;
1339                 type = FILEID_UDF_WITH_PARENT;
1340         }
1341
1342         return type;
1343 }
1344
1345 const struct export_operations udf_export_ops = {
1346         .encode_fh      = udf_encode_fh,
1347         .fh_to_dentry   = udf_fh_to_dentry,
1348         .fh_to_parent   = udf_fh_to_parent,
1349         .get_parent     = udf_get_parent,
1350 };
1351
1352 const struct inode_operations udf_dir_inode_operations = {
1353         .lookup                         = udf_lookup,
1354         .create                         = udf_create,
1355         .link                           = udf_link,
1356         .unlink                         = udf_unlink,
1357         .symlink                        = udf_symlink,
1358         .mkdir                          = udf_mkdir,
1359         .rmdir                          = udf_rmdir,
1360         .mknod                          = udf_mknod,
1361         .rename                         = udf_rename,
1362         .tmpfile                        = udf_tmpfile,
1363 };