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         udf_pblk_t block;
 355         struct kernel_lb_addr eloc;
 356         uint32_t elen = 0;
 357         sector_t offset;
 358         struct extent_position epos = {};
 359         struct udf_inode_info *dinfo;
 360
 361         fibh->sbh = fibh->ebh = NULL;
 362         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 363         if (!name) {
 364                 *err = -ENOMEM;
 365                 goto out_err;
 366         }
 367
 368         if (dentry) {
 369                 if (!dentry->d_name.len) {
 370                         *err = -EINVAL;
 371                         goto out_err;
 372                 }
 373                 namelen = udf_put_filename(sb, dentry->d_name.name,
 374                                            dentry->d_name.len,
 375                                            name, UDF_NAME_LEN_CS0);
 376                 if (!namelen) {
 377                         *err = -ENAMETOOLONG;
 378                         goto out_err;
 379                 }
 380         } else {
 381                 namelen = 0;
 382         }
 383
 384         nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 385
 386         f_pos = udf_ext0_offset(dir);
 387
 388         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 389         dinfo = UDF_I(dir);
 390         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 391                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 392                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 393                         block = udf_get_lb_pblock(dir->i_sb,
 394                                         &dinfo->i_location, 0);
 395                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 396                         goto add;
 397                 }
 398                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 399                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 400                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 401                                 epos.offset -= sizeof(struct short_ad);
 402                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 403                                 epos.offset -= sizeof(struct long_ad);
 404                 } else
 405                         offset = 0;
 406
 407                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 408                 if (!fibh->sbh) {
 409                         *err = -EIO;
 410                         goto out_err;
 411                 }
 412
 413                 block = dinfo->i_location.logicalBlockNum;
 414         }
 415
 416         while (f_pos < size) {
 417                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 418                                         &elen, &offset);
 419
 420                 if (!fi) {
 421                         *err = -EIO;
 422                         goto out_err;
 423                 }
 424
 425                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 426                         if (udf_dir_entry_len(cfi) == nfidlen) {
 427                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 428                                 cfi->fileVersionNum = cpu_to_le16(1);
 429                                 cfi->fileCharacteristics = 0;
 430                                 cfi->lengthFileIdent = namelen;
 431                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 432                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 433                                                   name))
 434                                         goto out_ok;
 435                                 else {
 436                                         *err = -EIO;
 437                                         goto out_err;
 438                                 }
 439                         }
 440                 }
 441         }
 442
 443 add:
 444         f_pos += nfidlen;
 445
 446         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 447             sb->s_blocksize - fibh->eoffset < nfidlen) {
 448                 brelse(epos.bh);
 449                 epos.bh = NULL;
 450                 fibh->soffset -= udf_ext0_offset(dir);
 451                 fibh->eoffset -= udf_ext0_offset(dir);
 452                 f_pos -= udf_ext0_offset(dir);
 453                 if (fibh->sbh != fibh->ebh)
 454                         brelse(fibh->ebh);
 455                 brelse(fibh->sbh);
 456                 fibh->sbh = fibh->ebh =
 457                                 udf_expand_dir_adinicb(dir, &block, err);
 458                 if (!fibh->sbh)
 459                         goto out_err;
 460                 epos.block = dinfo->i_location;
 461                 epos.offset = udf_file_entry_alloc_offset(dir);
 462                 /* Load extent udf_expand_dir_adinicb() has created */
 463                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 464         }
 465
 466         /* Entry fits into current block? */
 467         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 468                 fibh->soffset = fibh->eoffset;
 469                 fibh->eoffset += nfidlen;
 470                 if (fibh->sbh != fibh->ebh) {
 471                         brelse(fibh->sbh);
 472                         fibh->sbh = fibh->ebh;
 473                 }
 474
 475                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 476                         block = dinfo->i_location.logicalBlockNum;
 477                         fi = (struct fileIdentDesc *)
 478                                         (dinfo->i_ext.i_data +
 479                                          fibh->soffset -
 480                                          udf_ext0_offset(dir) +
 481                                          dinfo->i_lenEAttr);
 482                 } else {
 483                         block = eloc.logicalBlockNum +
 484                                         ((elen - 1) >>
 485                                                 dir->i_sb->s_blocksize_bits);
 486                         fi = (struct fileIdentDesc *)
 487                                 (fibh->sbh->b_data + fibh->soffset);
 488                 }
 489         } else {
 490                 /* Round up last extent in the file */
 491                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 492                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 493                         epos.offset -= sizeof(struct short_ad);
 494                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 495                         epos.offset -= sizeof(struct long_ad);
 496                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 497                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 498                                         - 1) & ~(sb->s_blocksize - 1);
 499
 500                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 501                 fibh->eoffset += nfidlen - sb->s_blocksize;
 502                 if (fibh->sbh != fibh->ebh) {
 503                         brelse(fibh->sbh);
 504                         fibh->sbh = fibh->ebh;
 505                 }
 506
 507                 block = eloc.logicalBlockNum + ((elen - 1) >>
 508                                                 dir->i_sb->s_blocksize_bits);
 509                 fibh->ebh = udf_bread(dir,
 510                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 511                 if (!fibh->ebh)
 512                         goto out_err;
 513                 /* Extents could have been merged, invalidate our position */
 514                 brelse(epos.bh);
 515                 epos.bh = NULL;
 516                 epos.block = dinfo->i_location;
 517                 epos.offset = udf_file_entry_alloc_offset(dir);
 518
 519                 if (!fibh->soffset) {
 520                         /* Find the freshly allocated block */
 521                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 522                                 (EXT_RECORDED_ALLOCATED >> 30))
 523                                 ;
 524                         block = eloc.logicalBlockNum + ((elen - 1) >>
 525                                         dir->i_sb->s_blocksize_bits);
 526                         brelse(fibh->sbh);
 527                         fibh->sbh = fibh->ebh;
 528                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 529                 } else {
 530                         fi = (struct fileIdentDesc *)
 531                                 (fibh->sbh->b_data + sb->s_blocksize +
 532                                         fibh->soffset);
 533                 }
 534         }
 535
 536         memset(cfi, 0, sizeof(struct fileIdentDesc));
 537         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 538                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 539                             sizeof(struct tag));
 540         else
 541                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 542                             sizeof(struct tag));
 543         cfi->fileVersionNum = cpu_to_le16(1);
 544         cfi->lengthFileIdent = namelen;
 545         cfi->lengthOfImpUse = cpu_to_le16(0);
 546         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 547                 dir->i_size += nfidlen;
 548                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 549                         dinfo->i_lenAlloc += nfidlen;
 550                 else {
 551                         /* Find the last extent and truncate it to proper size */
 552                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 553                                 (EXT_RECORDED_ALLOCATED >> 30))
 554                                 ;
 555                         elen -= dinfo->i_lenExtents - dir->i_size;
 556                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 557                                 epos.offset -= sizeof(struct short_ad);
 558                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 559                                 epos.offset -= sizeof(struct long_ad);
 560                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 561                         dinfo->i_lenExtents = dir->i_size;
 562                 }
 563
 564                 mark_inode_dirty(dir);
 565                 goto out_ok;
 566         } else {
 567                 *err = -EIO;
 568                 goto out_err;
 569         }
 570
 571 out_err:
 572         fi = NULL;
 573         if (fibh->sbh != fibh->ebh)
 574                 brelse(fibh->ebh);
 575         brelse(fibh->sbh);
 576 out_ok:
 577         brelse(epos.bh);
 578         kfree(name);
 579         return fi;
 580 }
 581
 582 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 583                             struct udf_fileident_bh *fibh,
 584                             struct fileIdentDesc *cfi)
 585 {
 586         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 587
 588         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 589                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 590
 591         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 592 }
 593
 594 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 595 {
 596         struct udf_inode_info *iinfo = UDF_I(inode);
 597         struct inode *dir = d_inode(dentry->d_parent);
 598         struct udf_fileident_bh fibh;
 599         struct fileIdentDesc cfi, *fi;
 600         int err;
 601
 602         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 603         if (unlikely(!fi)) {
 604                 inode_dec_link_count(inode);
 605                 unlock_new_inode(inode);
 606                 iput(inode);
 607                 return err;
 608         }
 609         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 610         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 611         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 612                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 613         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 614         dir->i_ctime = dir->i_mtime = current_time(dir);
 615         mark_inode_dirty(dir);
 616         if (fibh.sbh != fibh.ebh)
 617                 brelse(fibh.ebh);
 618         brelse(fibh.sbh);
 619         d_instantiate_new(dentry, inode);
 620
 621         return 0;
 622 }
 623
 624 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 625                       bool excl)
 626 {
 627         struct inode *inode = udf_new_inode(dir, mode);
 628
 629         if (IS_ERR(inode))
 630                 return PTR_ERR(inode);
 631
 632         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 633                 inode->i_data.a_ops = &udf_adinicb_aops;
 634         else
 635                 inode->i_data.a_ops = &udf_aops;
 636         inode->i_op = &udf_file_inode_operations;
 637         inode->i_fop = &udf_file_operations;
 638         mark_inode_dirty(inode);
 639
 640         return udf_add_nondir(dentry, inode);
 641 }
 642
 643 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 644 {
 645         struct inode *inode = udf_new_inode(dir, mode);
 646
 647         if (IS_ERR(inode))
 648                 return PTR_ERR(inode);
 649
 650         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 651                 inode->i_data.a_ops = &udf_adinicb_aops;
 652         else
 653                 inode->i_data.a_ops = &udf_aops;
 654         inode->i_op = &udf_file_inode_operations;
 655         inode->i_fop = &udf_file_operations;
 656         mark_inode_dirty(inode);
 657         d_tmpfile(dentry, inode);
 658         unlock_new_inode(inode);
 659         return 0;
 660 }
 661
 662 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 663                      dev_t rdev)
 664 {
 665         struct inode *inode;
 666
 667         if (!old_valid_dev(rdev))
 668                 return -EINVAL;
 669
 670         inode = udf_new_inode(dir, mode);
 671         if (IS_ERR(inode))
 672                 return PTR_ERR(inode);
 673
 674         init_special_inode(inode, mode, rdev);
 675         return udf_add_nondir(dentry, inode);
 676 }
 677
 678 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 679 {
 680         struct inode *inode;
 681         struct udf_fileident_bh fibh;
 682         struct fileIdentDesc cfi, *fi;
 683         int err;
 684         struct udf_inode_info *dinfo = UDF_I(dir);
 685         struct udf_inode_info *iinfo;
 686
 687         inode = udf_new_inode(dir, S_IFDIR | mode);
 688         if (IS_ERR(inode))
 689                 return PTR_ERR(inode);
 690
 691         iinfo = UDF_I(inode);
 692         inode->i_op = &udf_dir_inode_operations;
 693         inode->i_fop = &udf_dir_operations;
 694         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 695         if (!fi) {
 696                 inode_dec_link_count(inode);
 697                 unlock_new_inode(inode);
 698                 iput(inode);
 699                 goto out;
 700         }
 701         set_nlink(inode, 2);
 702         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 703         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 704         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 705                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 706         cfi.fileCharacteristics =
 707                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 708         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 709         brelse(fibh.sbh);
 710         mark_inode_dirty(inode);
 711
 712         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 713         if (!fi) {
 714                 clear_nlink(inode);
 715                 mark_inode_dirty(inode);
 716                 unlock_new_inode(inode);
 717                 iput(inode);
 718                 goto out;
 719         }
 720         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 721         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 722         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 723                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 724         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 725         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 726         inc_nlink(dir);
 727         dir->i_ctime = dir->i_mtime = current_time(dir);
 728         mark_inode_dirty(dir);
 729         d_instantiate_new(dentry, inode);
 730         if (fibh.sbh != fibh.ebh)
 731                 brelse(fibh.ebh);
 732         brelse(fibh.sbh);
 733         err = 0;
 734
 735 out:
 736         return err;
 737 }
 738
 739 static int empty_dir(struct inode *dir)
 740 {
 741         struct fileIdentDesc *fi, cfi;
 742         struct udf_fileident_bh fibh;
 743         loff_t f_pos;
 744         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 745         udf_pblk_t block;
 746         struct kernel_lb_addr eloc;
 747         uint32_t elen;
 748         sector_t offset;
 749         struct extent_position epos = {};
 750         struct udf_inode_info *dinfo = UDF_I(dir);
 751
 752         f_pos = udf_ext0_offset(dir);
 753         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 754
 755         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 756                 fibh.sbh = fibh.ebh = NULL;
 757         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 758                               &epos, &eloc, &elen, &offset) ==
 759                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 760                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 761                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 762                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 763                                 epos.offset -= sizeof(struct short_ad);
 764                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 765                                 epos.offset -= sizeof(struct long_ad);
 766                 } else
 767                         offset = 0;
 768
 769                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 770                 if (!fibh.sbh) {
 771                         brelse(epos.bh);
 772                         return 0;
 773                 }
 774         } else {
 775                 brelse(epos.bh);
 776                 return 0;
 777         }
 778
 779         while (f_pos < size) {
 780                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 781                                         &elen, &offset);
 782                 if (!fi) {
 783                         if (fibh.sbh != fibh.ebh)
 784                                 brelse(fibh.ebh);
 785                         brelse(fibh.sbh);
 786                         brelse(epos.bh);
 787                         return 0;
 788                 }
 789
 790                 if (cfi.lengthFileIdent &&
 791                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 792                         if (fibh.sbh != fibh.ebh)
 793                                 brelse(fibh.ebh);
 794                         brelse(fibh.sbh);
 795                         brelse(epos.bh);
 796                         return 0;
 797                 }
 798         }
 799
 800         if (fibh.sbh != fibh.ebh)
 801                 brelse(fibh.ebh);
 802         brelse(fibh.sbh);
 803         brelse(epos.bh);
 804
 805         return 1;
 806 }
 807
 808 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 809 {
 810         int retval;
 811         struct inode *inode = d_inode(dentry);
 812         struct udf_fileident_bh fibh;
 813         struct fileIdentDesc *fi, cfi;
 814         struct kernel_lb_addr tloc;
 815
 816         retval = -ENOENT;
 817         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 818         if (IS_ERR_OR_NULL(fi)) {
 819                 if (fi)
 820                         retval = PTR_ERR(fi);
 821                 goto out;
 822         }
 823
 824         retval = -EIO;
 825         tloc = lelb_to_cpu(cfi.icb.extLocation);
 826         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 827                 goto end_rmdir;
 828         retval = -ENOTEMPTY;
 829         if (!empty_dir(inode))
 830                 goto end_rmdir;
 831         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 832         if (retval)
 833                 goto end_rmdir;
 834         if (inode->i_nlink != 2)
 835                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 836                          inode->i_nlink);
 837         clear_nlink(inode);
 838         inode->i_size = 0;
 839         inode_dec_link_count(dir);
 840         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 841                                                 current_time(inode);
 842         mark_inode_dirty(dir);
 843
 844 end_rmdir:
 845         if (fibh.sbh != fibh.ebh)
 846                 brelse(fibh.ebh);
 847         brelse(fibh.sbh);
 848
 849 out:
 850         return retval;
 851 }
 852
 853 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 854 {
 855         int retval;
 856         struct inode *inode = d_inode(dentry);
 857         struct udf_fileident_bh fibh;
 858         struct fileIdentDesc *fi;
 859         struct fileIdentDesc cfi;
 860         struct kernel_lb_addr tloc;
 861
 862         retval = -ENOENT;
 863         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 864
 865         if (IS_ERR_OR_NULL(fi)) {
 866                 if (fi)
 867                         retval = PTR_ERR(fi);
 868                 goto out;
 869         }
 870
 871         retval = -EIO;
 872         tloc = lelb_to_cpu(cfi.icb.extLocation);
 873         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 874                 goto end_unlink;
 875
 876         if (!inode->i_nlink) {
 877                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 878                           inode->i_ino, inode->i_nlink);
 879                 set_nlink(inode, 1);
 880         }
 881         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 882         if (retval)
 883                 goto end_unlink;
 884         dir->i_ctime = dir->i_mtime = current_time(dir);
 885         mark_inode_dirty(dir);
 886         inode_dec_link_count(inode);
 887         inode->i_ctime = dir->i_ctime;
 888         retval = 0;
 889
 890 end_unlink:
 891         if (fibh.sbh != fibh.ebh)
 892                 brelse(fibh.ebh);
 893         brelse(fibh.sbh);
 894
 895 out:
 896         return retval;
 897 }
 898
 899 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 900                        const char *symname)
 901 {
 902         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 903         struct pathComponent *pc;
 904         const char *compstart;
 905         struct extent_position epos = {};
 906         int eoffset, elen = 0;
 907         uint8_t *ea;
 908         int err;
 909         udf_pblk_t block;
 910         unsigned char *name = NULL;
 911         int namelen;
 912         struct udf_inode_info *iinfo;
 913         struct super_block *sb = dir->i_sb;
 914
 915         if (IS_ERR(inode))
 916                 return PTR_ERR(inode);
 917
 918         iinfo = UDF_I(inode);
 919         down_write(&iinfo->i_data_sem);
 920         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 921         if (!name) {
 922                 err = -ENOMEM;
 923                 goto out_no_entry;
 924         }
 925
 926         inode->i_data.a_ops = &udf_symlink_aops;
 927         inode->i_op = &udf_symlink_inode_operations;
 928         inode_nohighmem(inode);
 929
 930         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 931                 struct kernel_lb_addr eloc;
 932                 uint32_t bsize;
 933
 934                 block = udf_new_block(sb, inode,
 935                                 iinfo->i_location.partitionReferenceNum,
 936                                 iinfo->i_location.logicalBlockNum, &err);
 937                 if (!block)
 938                         goto out_no_entry;
 939                 epos.block = iinfo->i_location;
 940                 epos.offset = udf_file_entry_alloc_offset(inode);
 941                 epos.bh = NULL;
 942                 eloc.logicalBlockNum = block;
 943                 eloc.partitionReferenceNum =
 944                                 iinfo->i_location.partitionReferenceNum;
 945                 bsize = sb->s_blocksize;
 946                 iinfo->i_lenExtents = bsize;
 947                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 948                 brelse(epos.bh);
 949
 950                 block = udf_get_pblock(sb, block,
 951                                 iinfo->i_location.partitionReferenceNum,
 952                                 0);
 953                 epos.bh = udf_tgetblk(sb, block);
 954                 lock_buffer(epos.bh);
 955                 memset(epos.bh->b_data, 0x00, bsize);
 956                 set_buffer_uptodate(epos.bh);
 957                 unlock_buffer(epos.bh);
 958                 mark_buffer_dirty_inode(epos.bh, inode);
 959                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 960         } else
 961                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 962
 963         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 964         pc = (struct pathComponent *)ea;
 965
 966         if (*symname == '/') {
 967                 do {
 968                         symname++;
 969                 } while (*symname == '/');
 970
 971                 pc->componentType = 1;
 972                 pc->lengthComponentIdent = 0;
 973                 pc->componentFileVersionNum = 0;
 974                 elen += sizeof(struct pathComponent);
 975         }
 976
 977         err = -ENAMETOOLONG;
 978
 979         while (*symname) {
 980                 if (elen + sizeof(struct pathComponent) > eoffset)
 981                         goto out_no_entry;
 982
 983                 pc = (struct pathComponent *)(ea + elen);
 984
 985                 compstart = symname;
 986
 987                 do {
 988                         symname++;
 989                 } while (*symname && *symname != '/');
 990
 991                 pc->componentType = 5;
 992                 pc->lengthComponentIdent = 0;
 993                 pc->componentFileVersionNum = 0;
 994                 if (compstart[0] == '.') {
 995                         if ((symname - compstart) == 1)
 996                                 pc->componentType = 4;
 997                         else if ((symname - compstart) == 2 &&
 998                                         compstart[1] == '.')
 999                                 pc->componentType = 3;
1000                 }
1001
1002                 if (pc->componentType == 5) {
1003                         namelen = udf_put_filename(sb, compstart,
1004                                                    symname - compstart,
1005                                                    name, UDF_NAME_LEN_CS0);
1006                         if (!namelen)
1007                                 goto out_no_entry;
1008
1009                         if (elen + sizeof(struct pathComponent) + namelen >
1010                                         eoffset)
1011                                 goto out_no_entry;
1012                         else
1013                                 pc->lengthComponentIdent = namelen;
1014
1015                         memcpy(pc->componentIdent, name, namelen);
1016                 }
1017
1018                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1019
1020                 if (*symname) {
1021                         do {
1022                                 symname++;
1023                         } while (*symname == '/');
1024                 }
1025         }
1026
1027         brelse(epos.bh);
1028         inode->i_size = elen;
1029         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1030                 iinfo->i_lenAlloc = inode->i_size;
1031         else
1032                 udf_truncate_tail_extent(inode);
1033         mark_inode_dirty(inode);
1034         up_write(&iinfo->i_data_sem);
1035
1036         err = udf_add_nondir(dentry, inode);
1037 out:
1038         kfree(name);
1039         return err;
1040
1041 out_no_entry:
1042         up_write(&iinfo->i_data_sem);
1043         inode_dec_link_count(inode);
1044         unlock_new_inode(inode);
1045         iput(inode);
1046         goto out;
1047 }
1048
1049 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1050                     struct dentry *dentry)
1051 {
1052         struct inode *inode = d_inode(old_dentry);
1053         struct udf_fileident_bh fibh;
1054         struct fileIdentDesc cfi, *fi;
1055         int err;
1056
1057         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1058         if (!fi) {
1059                 return err;
1060         }
1061         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1062         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1063         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1064                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1065                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1066         }
1067         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1068         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1069                 mark_inode_dirty(dir);
1070
1071         if (fibh.sbh != fibh.ebh)
1072                 brelse(fibh.ebh);
1073         brelse(fibh.sbh);
1074         inc_nlink(inode);
1075         inode->i_ctime = current_time(inode);
1076         mark_inode_dirty(inode);
1077         dir->i_ctime = dir->i_mtime = current_time(dir);
1078         mark_inode_dirty(dir);
1079         ihold(inode);
1080         d_instantiate(dentry, inode);
1081
1082         return 0;
1083 }
1084
1085 /* Anybody can rename anything with this: the permission checks are left to the
1086  * higher-level routines.
1087  */
1088 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1089                       struct inode *new_dir, struct dentry *new_dentry,
1090                       unsigned int flags)
1091 {
1092         struct inode *old_inode = d_inode(old_dentry);
1093         struct inode *new_inode = d_inode(new_dentry);
1094         struct udf_fileident_bh ofibh, nfibh;
1095         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1096         struct fileIdentDesc ocfi, ncfi;
1097         struct buffer_head *dir_bh = NULL;
1098         int retval = -ENOENT;
1099         struct kernel_lb_addr tloc;
1100         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1101
1102         if (flags & ~RENAME_NOREPLACE)
1103                 return -EINVAL;
1104
1105         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1106         if (IS_ERR(ofi)) {
1107                 retval = PTR_ERR(ofi);
1108                 goto end_rename;
1109         }
1110
1111         if (ofibh.sbh != ofibh.ebh)
1112                 brelse(ofibh.ebh);
1113
1114         brelse(ofibh.sbh);
1115         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1116         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1117             != old_inode->i_ino)
1118                 goto end_rename;
1119
1120         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1121         if (IS_ERR(nfi)) {
1122                 retval = PTR_ERR(nfi);
1123                 goto end_rename;
1124         }
1125         if (nfi && !new_inode) {
1126                 if (nfibh.sbh != nfibh.ebh)
1127                         brelse(nfibh.ebh);
1128                 brelse(nfibh.sbh);
1129                 nfi = NULL;
1130         }
1131         if (S_ISDIR(old_inode->i_mode)) {
1132                 int offset = udf_ext0_offset(old_inode);
1133
1134                 if (new_inode) {
1135                         retval = -ENOTEMPTY;
1136                         if (!empty_dir(new_inode))
1137                                 goto end_rename;
1138                 }
1139                 retval = -EIO;
1140                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1141                         dir_fi = udf_get_fileident(
1142                                         old_iinfo->i_ext.i_data -
1143                                           (old_iinfo->i_efe ?
1144                                            sizeof(struct extendedFileEntry) :
1145                                            sizeof(struct fileEntry)),
1146                                         old_inode->i_sb->s_blocksize, &offset);
1147                 } else {
1148                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1149                         if (!dir_bh)
1150                                 goto end_rename;
1151                         dir_fi = udf_get_fileident(dir_bh->b_data,
1152                                         old_inode->i_sb->s_blocksize, &offset);
1153                 }
1154                 if (!dir_fi)
1155                         goto end_rename;
1156                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1157                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1158                                 old_dir->i_ino)
1159                         goto end_rename;
1160         }
1161         if (!nfi) {
1162                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1163                                     &retval);
1164                 if (!nfi)
1165                         goto end_rename;
1166         }
1167
1168         /*
1169          * Like most other Unix systems, set the ctime for inodes on a
1170          * rename.
1171          */
1172         old_inode->i_ctime = current_time(old_inode);
1173         mark_inode_dirty(old_inode);
1174
1175         /*
1176          * ok, that's it
1177          */
1178         ncfi.fileVersionNum = ocfi.fileVersionNum;
1179         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1180         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1181         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1182
1183         /* The old fid may have moved - find it again */
1184         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1185         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1186
1187         if (new_inode) {
1188                 new_inode->i_ctime = current_time(new_inode);
1189                 inode_dec_link_count(new_inode);
1190         }
1191         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1192         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1193         mark_inode_dirty(old_dir);
1194         mark_inode_dirty(new_dir);
1195
1196         if (dir_fi) {
1197                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1198                 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1199                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1200                         mark_inode_dirty(old_inode);
1201                 else
1202                         mark_buffer_dirty_inode(dir_bh, old_inode);
1203
1204                 inode_dec_link_count(old_dir);
1205                 if (new_inode)
1206                         inode_dec_link_count(new_inode);
1207                 else {
1208                         inc_nlink(new_dir);
1209                         mark_inode_dirty(new_dir);
1210                 }
1211         }
1212
1213         if (ofi) {
1214                 if (ofibh.sbh != ofibh.ebh)
1215                         brelse(ofibh.ebh);
1216                 brelse(ofibh.sbh);
1217         }
1218
1219         retval = 0;
1220
1221 end_rename:
1222         brelse(dir_bh);
1223         if (nfi) {
1224                 if (nfibh.sbh != nfibh.ebh)
1225                         brelse(nfibh.ebh);
1226                 brelse(nfibh.sbh);
1227         }
1228
1229         return retval;
1230 }
1231
1232 static struct dentry *udf_get_parent(struct dentry *child)
1233 {
1234         struct kernel_lb_addr tloc;
1235         struct inode *inode = NULL;
1236         struct qstr dotdot = QSTR_INIT("..", 2);
1237         struct fileIdentDesc cfi;
1238         struct udf_fileident_bh fibh;
1239
1240         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1241                 return ERR_PTR(-EACCES);
1242
1243         if (fibh.sbh != fibh.ebh)
1244                 brelse(fibh.ebh);
1245         brelse(fibh.sbh);
1246
1247         tloc = lelb_to_cpu(cfi.icb.extLocation);
1248         inode = udf_iget(child->d_sb, &tloc);
1249         if (IS_ERR(inode))
1250                 return ERR_CAST(inode);
1251
1252         return d_obtain_alias(inode);
1253 }
1254
1255
1256 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1257                                         u16 partref, __u32 generation)
1258 {
1259         struct inode *inode;
1260         struct kernel_lb_addr loc;
1261
1262         if (block == 0)
1263                 return ERR_PTR(-ESTALE);
1264
1265         loc.logicalBlockNum = block;
1266         loc.partitionReferenceNum = partref;
1267         inode = udf_iget(sb, &loc);
1268
1269         if (IS_ERR(inode))
1270                 return ERR_CAST(inode);
1271
1272         if (generation && inode->i_generation != generation) {
1273                 iput(inode);
1274                 return ERR_PTR(-ESTALE);
1275         }
1276         return d_obtain_alias(inode);
1277 }
1278
1279 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1280                                        struct fid *fid, int fh_len, int fh_type)
1281 {
1282         if (fh_len < 3 ||
1283             (fh_type != FILEID_UDF_WITH_PARENT &&
1284              fh_type != FILEID_UDF_WITHOUT_PARENT))
1285                 return NULL;
1286
1287         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1288                         fid->udf.generation);
1289 }
1290
1291 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1292                                        struct fid *fid, int fh_len, int fh_type)
1293 {
1294         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1295                 return NULL;
1296
1297         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1298                                  fid->udf.parent_partref,
1299                                  fid->udf.parent_generation);
1300 }
1301 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1302                          struct inode *parent)
1303 {
1304         int len = *lenp;
1305         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1306         struct fid *fid = (struct fid *)fh;
1307         int type = FILEID_UDF_WITHOUT_PARENT;
1308
1309         if (parent && (len < 5)) {
1310                 *lenp = 5;
1311                 return FILEID_INVALID;
1312         } else if (len < 3) {
1313                 *lenp = 3;
1314                 return FILEID_INVALID;
1315         }
1316
1317         *lenp = 3;
1318         fid->udf.block = location.logicalBlockNum;
1319         fid->udf.partref = location.partitionReferenceNum;
1320         fid->udf.parent_partref = 0;
1321         fid->udf.generation = inode->i_generation;
1322
1323         if (parent) {
1324                 location = UDF_I(parent)->i_location;
1325                 fid->udf.parent_block = location.logicalBlockNum;
1326                 fid->udf.parent_partref = location.partitionReferenceNum;
1327                 fid->udf.parent_generation = inode->i_generation;
1328                 *lenp = 5;
1329                 type = FILEID_UDF_WITH_PARENT;
1330         }
1331
1332         return type;
1333 }
1334
1335 const struct export_operations udf_export_ops = {
1336         .encode_fh      = udf_encode_fh,
1337         .fh_to_dentry   = udf_fh_to_dentry,
1338         .fh_to_parent   = udf_fh_to_parent,
1339         .get_parent     = udf_get_parent,
1340 };
1341
1342 const struct inode_operations udf_dir_inode_operations = {
1343         .lookup                         = udf_lookup,
1344         .create                         = udf_create,
1345         .link                           = udf_link,
1346         .unlink                         = udf_unlink,
1347         .symlink                        = udf_symlink,
1348         .mkdir                          = udf_mkdir,
1349         .rmdir                          = udf_rmdir,
1350         .mknod                          = udf_mknod,
1351         .rename                         = udf_rename,
1352         .tmpfile                        = udf_tmpfile,
1353 };