fs/udf/namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2004 Ben Fennema
  14  *  (C) 1999-2000 Stelias Computing Inc
  15  *
  16  * HISTORY
  17  *
  18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  19  *  04/19/99 blf  link, mknod, symlink support
  20  */
  21
  22 #include "udfdecl.h"
  23
  24 #include "udf_i.h"
  25 #include "udf_sb.h"
  26 #include <linux/string.h>
  27 #include <linux/errno.h>
  28 #include <linux/mm.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched.h>
  31 #include <linux/crc-itu-t.h>
  32 #include <linux/exportfs.h>
  33
  34 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  35                             const unsigned char *name2)
  36 {
  37         if (len1 != len2)
  38                 return 0;
  39
  40         return !memcmp(name1, name2, len1);
  41 }
  42
  43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  44                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  45                  uint8_t *impuse, uint8_t *fileident)
  46 {
  47         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  48         uint16_t crc;
  49         int offset;
  50         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  51         uint8_t lfi = cfi->lengthFileIdent;
  52         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  53                 sizeof(struct fileIdentDesc);
  54         int adinicb = 0;
  55
  56         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  57                 adinicb = 1;
  58
  59         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  60
  61         if (impuse) {
  62                 if (adinicb || (offset + liu < 0)) {
  63                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  64                 } else if (offset >= 0) {
  65                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  66                 } else {
  67                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  68                         memcpy(fibh->ebh->b_data, impuse - offset,
  69                                 liu + offset);
  70                 }
  71         }
  72
  73         offset += liu;
  74
  75         if (fileident) {
  76                 if (adinicb || (offset + lfi < 0)) {
  77                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  78                 } else if (offset >= 0) {
  79                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  80                 } else {
  81                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  82                                 -offset);
  83                         memcpy(fibh->ebh->b_data, fileident - offset,
  84                                 lfi + offset);
  85                 }
  86         }
  87
  88         offset += lfi;
  89
  90         if (adinicb || (offset + padlen < 0)) {
  91                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  92         } else if (offset >= 0) {
  93                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  94         } else {
  95                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  96                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  97         }
  98
  99         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
 100                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 101
 102         if (fibh->sbh == fibh->ebh) {
 103                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 104                               crclen + sizeof(struct tag) -
 105                               sizeof(struct fileIdentDesc));
 106         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 107                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 108                                         sizeof(struct fileIdentDesc) +
 109                                         fibh->soffset,
 110                               crclen + sizeof(struct tag) -
 111                                         sizeof(struct fileIdentDesc));
 112         } else {
 113                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 114                               -fibh->soffset - sizeof(struct fileIdentDesc));
 115                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 116         }
 117
 118         cfi->descTag.descCRC = cpu_to_le16(crc);
 119         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 120         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 121
 122         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 123                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 124                         sizeof(struct fileIdentDesc));
 125         } else {
 126                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 127                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 128                        sizeof(struct fileIdentDesc) + fibh->soffset);
 129         }
 130
 131         if (adinicb) {
 132                 mark_inode_dirty(inode);
 133         } else {
 134                 if (fibh->sbh != fibh->ebh)
 135                         mark_buffer_dirty_inode(fibh->ebh, inode);
 136                 mark_buffer_dirty_inode(fibh->sbh, inode);
 137         }
 138         return 0;
 139 }
 140
 141 /**
 142  * udf_find_entry - find entry in given directory.
 143  *
 144  * @dir:        directory inode to search in
 145  * @child:      qstr of the name
 146  * @fibh:       buffer head / inode with file identifier descriptor we found
 147  * @cfi:        found file identifier descriptor with given name
 148  *
 149  * This function searches in the directory @dir for a file name @child. When
 150  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 151  * directories) containing the file identifier descriptor (FID). In that case
 152  * the function returns pointer to the FID in the buffer or inode - but note
 153  * that FID may be split among two buffers (blocks) so accessing it via that
 154  * pointer isn't easily possible. This pointer can be used only as an iterator
 155  * for other directory manipulation functions. For inspection of the FID @cfi
 156  * can be used - the found FID is copied there.
 157  *
 158  * Returns pointer to FID, NULL when nothing found, or error code.
 159  */
 160 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 161                                             const struct qstr *child,
 162                                             struct udf_fileident_bh *fibh,
 163                                             struct fileIdentDesc *cfi)
 164 {
 165         struct fileIdentDesc *fi = NULL;
 166         loff_t f_pos;
 167         int block, flen;
 168         unsigned char *fname = NULL, *copy_name = NULL;
 169         unsigned char *nameptr;
 170         uint8_t lfi;
 171         uint16_t liu;
 172         loff_t size;
 173         struct kernel_lb_addr eloc;
 174         uint32_t elen;
 175         sector_t offset;
 176         struct extent_position epos = {};
 177         struct udf_inode_info *dinfo = UDF_I(dir);
 178         int isdotdot = child->len == 2 &&
 179                 child->name[0] == '.' && child->name[1] == '.';
 180         struct super_block *sb = dir->i_sb;
 181
 182         size = udf_ext0_offset(dir) + dir->i_size;
 183         f_pos = udf_ext0_offset(dir);
 184
 185         fibh->sbh = fibh->ebh = NULL;
 186         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 187         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 188                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 189                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 190                         fi = ERR_PTR(-EIO);
 191                         goto out_err;
 192                 }
 193
 194                 block = udf_get_lb_pblock(sb, &eloc, offset);
 195                 if ((++offset << sb->s_blocksize_bits) < elen) {
 196                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 197                                 epos.offset -= sizeof(struct short_ad);
 198                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 199                                 epos.offset -= sizeof(struct long_ad);
 200                 } else
 201                         offset = 0;
 202
 203                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 204                 if (!fibh->sbh) {
 205                         fi = ERR_PTR(-EIO);
 206                         goto out_err;
 207                 }
 208         }
 209
 210         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 211         if (!fname) {
 212                 fi = ERR_PTR(-ENOMEM);
 213                 goto out_err;
 214         }
 215
 216         while (f_pos < size) {
 217                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 218                                         &elen, &offset);
 219                 if (!fi) {
 220                         fi = ERR_PTR(-EIO);
 221                         goto out_err;
 222                 }
 223
 224                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 225                 lfi = cfi->lengthFileIdent;
 226
 227                 if (fibh->sbh == fibh->ebh) {
 228                         nameptr = fi->fileIdent + liu;
 229                 } else {
 230                         int poffset;    /* Unpaded ending offset */
 231
 232                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 233                                         liu + lfi;
 234
 235                         if (poffset >= lfi)
 236                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 237                                                       poffset - lfi);
 238                         else {
 239                                 if (!copy_name) {
 240                                         copy_name = kmalloc(UDF_NAME_LEN,
 241                                                             GFP_NOFS);
 242                                         if (!copy_name) {
 243                                                 fi = ERR_PTR(-ENOMEM);
 244                                                 goto out_err;
 245                                         }
 246                                 }
 247                                 nameptr = copy_name;
 248                                 memcpy(nameptr, fi->fileIdent + liu,
 249                                         lfi - poffset);
 250                                 memcpy(nameptr + lfi - poffset,
 251                                         fibh->ebh->b_data, poffset);
 252                         }
 253                 }
 254
 255                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 256                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 257                                 continue;
 258                 }
 259
 260                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 261                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 262                                 continue;
 263                 }
 264
 265                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 266                     isdotdot)
 267                         goto out_ok;
 268
 269                 if (!lfi)
 270                         continue;
 271
 272                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 273                 if (flen < 0) {
 274                         fi = ERR_PTR(flen);
 275                         goto out_err;
 276                 }
 277
 278                 if (udf_match(flen, fname, child->len, child->name))
 279                         goto out_ok;
 280         }
 281
 282         fi = NULL;
 283 out_err:
 284         if (fibh->sbh != fibh->ebh)
 285                 brelse(fibh->ebh);
 286         brelse(fibh->sbh);
 287 out_ok:
 288         brelse(epos.bh);
 289         kfree(fname);
 290         kfree(copy_name);
 291
 292         return fi;
 293 }
 294
 295 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 296                                  unsigned int flags)
 297 {
 298         struct inode *inode = NULL;
 299         struct fileIdentDesc cfi;
 300         struct udf_fileident_bh fibh;
 301         struct fileIdentDesc *fi;
 302
 303         if (dentry->d_name.len > UDF_NAME_LEN)
 304                 return ERR_PTR(-ENAMETOOLONG);
 305
 306 #ifdef UDF_RECOVERY
 307         /* temporary shorthand for specifying files by inode number */
 308         if (!strncmp(dentry->d_name.name, ".B=", 3)) {
 309                 struct kernel_lb_addr lb = {
 310                         .logicalBlockNum = 0,
 311                         .partitionReferenceNum =
 312                                 simple_strtoul(dentry->d_name.name + 3,
 313                                                 NULL, 0),
 314                 };
 315                 inode = udf_iget(dir->i_sb, lb);
 316                 if (IS_ERR(inode))
 317                         return inode;
 318         } else
 319 #endif /* UDF_RECOVERY */
 320
 321         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 322         if (IS_ERR(fi))
 323                 return ERR_CAST(fi);
 324
 325         if (fi) {
 326                 struct kernel_lb_addr loc;
 327
 328                 if (fibh.sbh != fibh.ebh)
 329                         brelse(fibh.ebh);
 330                 brelse(fibh.sbh);
 331
 332                 loc = lelb_to_cpu(cfi.icb.extLocation);
 333                 inode = udf_iget(dir->i_sb, &loc);
 334                 if (IS_ERR(inode))
 335                         return ERR_CAST(inode);
 336         }
 337
 338         return d_splice_alias(inode, dentry);
 339 }
 340
 341 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 342                                            struct dentry *dentry,
 343                                            struct udf_fileident_bh *fibh,
 344                                            struct fileIdentDesc *cfi, int *err)
 345 {
 346         struct super_block *sb = dir->i_sb;
 347         struct fileIdentDesc *fi = NULL;
 348         unsigned char *name = NULL;
 349         int namelen;
 350         loff_t f_pos;
 351         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 352         int nfidlen;
 353         uint8_t lfi;
 354         uint16_t liu;
 355         int block;
 356         struct kernel_lb_addr eloc;
 357         uint32_t elen = 0;
 358         sector_t offset;
 359         struct extent_position epos = {};
 360         struct udf_inode_info *dinfo;
 361
 362         fibh->sbh = fibh->ebh = NULL;
 363         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 364         if (!name) {
 365                 *err = -ENOMEM;
 366                 goto out_err;
 367         }
 368
 369         if (dentry) {
 370                 if (!dentry->d_name.len) {
 371                         *err = -EINVAL;
 372                         goto out_err;
 373                 }
 374                 namelen = udf_put_filename(sb, dentry->d_name.name,
 375                                            dentry->d_name.len,
 376                                            name, UDF_NAME_LEN_CS0);
 377                 if (!namelen) {
 378                         *err = -ENAMETOOLONG;
 379                         goto out_err;
 380                 }
 381         } else {
 382                 namelen = 0;
 383         }
 384
 385         nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
 386
 387         f_pos = udf_ext0_offset(dir);
 388
 389         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 390         dinfo = UDF_I(dir);
 391         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 392                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 393                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 394                         block = udf_get_lb_pblock(dir->i_sb,
 395                                         &dinfo->i_location, 0);
 396                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 397                         goto add;
 398                 }
 399                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 400                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 401                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 402                                 epos.offset -= sizeof(struct short_ad);
 403                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 404                                 epos.offset -= sizeof(struct long_ad);
 405                 } else
 406                         offset = 0;
 407
 408                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 409                 if (!fibh->sbh) {
 410                         *err = -EIO;
 411                         goto out_err;
 412                 }
 413
 414                 block = dinfo->i_location.logicalBlockNum;
 415         }
 416
 417         while (f_pos < size) {
 418                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 419                                         &elen, &offset);
 420
 421                 if (!fi) {
 422                         *err = -EIO;
 423                         goto out_err;
 424                 }
 425
 426                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 427                 lfi = cfi->lengthFileIdent;
 428
 429                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 430                         if (((sizeof(struct fileIdentDesc) +
 431                                         liu + lfi + 3) & ~3) == nfidlen) {
 432                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 433                                 cfi->fileVersionNum = cpu_to_le16(1);
 434                                 cfi->fileCharacteristics = 0;
 435                                 cfi->lengthFileIdent = namelen;
 436                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 437                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 438                                                   name))
 439                                         goto out_ok;
 440                                 else {
 441                                         *err = -EIO;
 442                                         goto out_err;
 443                                 }
 444                         }
 445                 }
 446         }
 447
 448 add:
 449         f_pos += nfidlen;
 450
 451         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 452             sb->s_blocksize - fibh->eoffset < nfidlen) {
 453                 brelse(epos.bh);
 454                 epos.bh = NULL;
 455                 fibh->soffset -= udf_ext0_offset(dir);
 456                 fibh->eoffset -= udf_ext0_offset(dir);
 457                 f_pos -= udf_ext0_offset(dir);
 458                 if (fibh->sbh != fibh->ebh)
 459                         brelse(fibh->ebh);
 460                 brelse(fibh->sbh);
 461                 fibh->sbh = fibh->ebh =
 462                                 udf_expand_dir_adinicb(dir, &block, err);
 463                 if (!fibh->sbh)
 464                         goto out_err;
 465                 epos.block = dinfo->i_location;
 466                 epos.offset = udf_file_entry_alloc_offset(dir);
 467                 /* Load extent udf_expand_dir_adinicb() has created */
 468                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 469         }
 470
 471         /* Entry fits into current block? */
 472         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 473                 fibh->soffset = fibh->eoffset;
 474                 fibh->eoffset += nfidlen;
 475                 if (fibh->sbh != fibh->ebh) {
 476                         brelse(fibh->sbh);
 477                         fibh->sbh = fibh->ebh;
 478                 }
 479
 480                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 481                         block = dinfo->i_location.logicalBlockNum;
 482                         fi = (struct fileIdentDesc *)
 483                                         (dinfo->i_ext.i_data +
 484                                          fibh->soffset -
 485                                          udf_ext0_offset(dir) +
 486                                          dinfo->i_lenEAttr);
 487                 } else {
 488                         block = eloc.logicalBlockNum +
 489                                         ((elen - 1) >>
 490                                                 dir->i_sb->s_blocksize_bits);
 491                         fi = (struct fileIdentDesc *)
 492                                 (fibh->sbh->b_data + fibh->soffset);
 493                 }
 494         } else {
 495                 /* Round up last extent in the file */
 496                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 497                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 498                         epos.offset -= sizeof(struct short_ad);
 499                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 500                         epos.offset -= sizeof(struct long_ad);
 501                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 502                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 503                                         - 1) & ~(sb->s_blocksize - 1);
 504
 505                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 506                 fibh->eoffset += nfidlen - sb->s_blocksize;
 507                 if (fibh->sbh != fibh->ebh) {
 508                         brelse(fibh->sbh);
 509                         fibh->sbh = fibh->ebh;
 510                 }
 511
 512                 block = eloc.logicalBlockNum + ((elen - 1) >>
 513                                                 dir->i_sb->s_blocksize_bits);
 514                 fibh->ebh = udf_bread(dir,
 515                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 516                 if (!fibh->ebh)
 517                         goto out_err;
 518                 /* Extents could have been merged, invalidate our position */
 519                 brelse(epos.bh);
 520                 epos.bh = NULL;
 521                 epos.block = dinfo->i_location;
 522                 epos.offset = udf_file_entry_alloc_offset(dir);
 523
 524                 if (!fibh->soffset) {
 525                         /* Find the freshly allocated block */
 526                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 527                                 (EXT_RECORDED_ALLOCATED >> 30))
 528                                 ;
 529                         block = eloc.logicalBlockNum + ((elen - 1) >>
 530                                         dir->i_sb->s_blocksize_bits);
 531                         brelse(fibh->sbh);
 532                         fibh->sbh = fibh->ebh;
 533                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 534                 } else {
 535                         fi = (struct fileIdentDesc *)
 536                                 (fibh->sbh->b_data + sb->s_blocksize +
 537                                         fibh->soffset);
 538                 }
 539         }
 540
 541         memset(cfi, 0, sizeof(struct fileIdentDesc));
 542         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 543                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 544                             sizeof(struct tag));
 545         else
 546                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 547                             sizeof(struct tag));
 548         cfi->fileVersionNum = cpu_to_le16(1);
 549         cfi->lengthFileIdent = namelen;
 550         cfi->lengthOfImpUse = cpu_to_le16(0);
 551         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 552                 dir->i_size += nfidlen;
 553                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 554                         dinfo->i_lenAlloc += nfidlen;
 555                 else {
 556                         /* Find the last extent and truncate it to proper size */
 557                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 558                                 (EXT_RECORDED_ALLOCATED >> 30))
 559                                 ;
 560                         elen -= dinfo->i_lenExtents - dir->i_size;
 561                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 562                                 epos.offset -= sizeof(struct short_ad);
 563                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 564                                 epos.offset -= sizeof(struct long_ad);
 565                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 566                         dinfo->i_lenExtents = dir->i_size;
 567                 }
 568
 569                 mark_inode_dirty(dir);
 570                 goto out_ok;
 571         } else {
 572                 *err = -EIO;
 573                 goto out_err;
 574         }
 575
 576 out_err:
 577         fi = NULL;
 578         if (fibh->sbh != fibh->ebh)
 579                 brelse(fibh->ebh);
 580         brelse(fibh->sbh);
 581 out_ok:
 582         brelse(epos.bh);
 583         kfree(name);
 584         return fi;
 585 }
 586
 587 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 588                             struct udf_fileident_bh *fibh,
 589                             struct fileIdentDesc *cfi)
 590 {
 591         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 592
 593         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 594                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 595
 596         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 597 }
 598
 599 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 600 {
 601         struct udf_inode_info *iinfo = UDF_I(inode);
 602         struct inode *dir = d_inode(dentry->d_parent);
 603         struct udf_fileident_bh fibh;
 604         struct fileIdentDesc cfi, *fi;
 605         int err;
 606
 607         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 608         if (unlikely(!fi)) {
 609                 inode_dec_link_count(inode);
 610                 unlock_new_inode(inode);
 611                 iput(inode);
 612                 return err;
 613         }
 614         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 615         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 616         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 617                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 618         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 619         dir->i_ctime = dir->i_mtime = current_time(dir);
 620         mark_inode_dirty(dir);
 621         if (fibh.sbh != fibh.ebh)
 622                 brelse(fibh.ebh);
 623         brelse(fibh.sbh);
 624         d_instantiate_new(dentry, inode);
 625
 626         return 0;
 627 }
 628
 629 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 630                       bool excl)
 631 {
 632         struct inode *inode = udf_new_inode(dir, mode);
 633
 634         if (IS_ERR(inode))
 635                 return PTR_ERR(inode);
 636
 637         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 638                 inode->i_data.a_ops = &udf_adinicb_aops;
 639         else
 640                 inode->i_data.a_ops = &udf_aops;
 641         inode->i_op = &udf_file_inode_operations;
 642         inode->i_fop = &udf_file_operations;
 643         mark_inode_dirty(inode);
 644
 645         return udf_add_nondir(dentry, inode);
 646 }
 647
 648 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 649 {
 650         struct inode *inode = udf_new_inode(dir, mode);
 651
 652         if (IS_ERR(inode))
 653                 return PTR_ERR(inode);
 654
 655         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 656                 inode->i_data.a_ops = &udf_adinicb_aops;
 657         else
 658                 inode->i_data.a_ops = &udf_aops;
 659         inode->i_op = &udf_file_inode_operations;
 660         inode->i_fop = &udf_file_operations;
 661         mark_inode_dirty(inode);
 662         d_tmpfile(dentry, inode);
 663         unlock_new_inode(inode);
 664         return 0;
 665 }
 666
 667 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 668                      dev_t rdev)
 669 {
 670         struct inode *inode;
 671
 672         if (!old_valid_dev(rdev))
 673                 return -EINVAL;
 674
 675         inode = udf_new_inode(dir, mode);
 676         if (IS_ERR(inode))
 677                 return PTR_ERR(inode);
 678
 679         init_special_inode(inode, mode, rdev);
 680         return udf_add_nondir(dentry, inode);
 681 }
 682
 683 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 684 {
 685         struct inode *inode;
 686         struct udf_fileident_bh fibh;
 687         struct fileIdentDesc cfi, *fi;
 688         int err;
 689         struct udf_inode_info *dinfo = UDF_I(dir);
 690         struct udf_inode_info *iinfo;
 691
 692         inode = udf_new_inode(dir, S_IFDIR | mode);
 693         if (IS_ERR(inode))
 694                 return PTR_ERR(inode);
 695
 696         iinfo = UDF_I(inode);
 697         inode->i_op = &udf_dir_inode_operations;
 698         inode->i_fop = &udf_dir_operations;
 699         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 700         if (!fi) {
 701                 inode_dec_link_count(inode);
 702                 unlock_new_inode(inode);
 703                 iput(inode);
 704                 goto out;
 705         }
 706         set_nlink(inode, 2);
 707         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 708         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 709         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 710                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 711         cfi.fileCharacteristics =
 712                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 713         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 714         brelse(fibh.sbh);
 715         mark_inode_dirty(inode);
 716
 717         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 718         if (!fi) {
 719                 clear_nlink(inode);
 720                 mark_inode_dirty(inode);
 721                 unlock_new_inode(inode);
 722                 iput(inode);
 723                 goto out;
 724         }
 725         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 726         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 727         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 728                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 729         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 730         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 731         inc_nlink(dir);
 732         dir->i_ctime = dir->i_mtime = current_time(dir);
 733         mark_inode_dirty(dir);
 734         d_instantiate_new(dentry, inode);
 735         if (fibh.sbh != fibh.ebh)
 736                 brelse(fibh.ebh);
 737         brelse(fibh.sbh);
 738         err = 0;
 739
 740 out:
 741         return err;
 742 }
 743
 744 static int empty_dir(struct inode *dir)
 745 {
 746         struct fileIdentDesc *fi, cfi;
 747         struct udf_fileident_bh fibh;
 748         loff_t f_pos;
 749         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 750         int block;
 751         struct kernel_lb_addr eloc;
 752         uint32_t elen;
 753         sector_t offset;
 754         struct extent_position epos = {};
 755         struct udf_inode_info *dinfo = UDF_I(dir);
 756
 757         f_pos = udf_ext0_offset(dir);
 758         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 759
 760         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 761                 fibh.sbh = fibh.ebh = NULL;
 762         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 763                               &epos, &eloc, &elen, &offset) ==
 764                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 765                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 766                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 767                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 768                                 epos.offset -= sizeof(struct short_ad);
 769                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 770                                 epos.offset -= sizeof(struct long_ad);
 771                 } else
 772                         offset = 0;
 773
 774                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 775                 if (!fibh.sbh) {
 776                         brelse(epos.bh);
 777                         return 0;
 778                 }
 779         } else {
 780                 brelse(epos.bh);
 781                 return 0;
 782         }
 783
 784         while (f_pos < size) {
 785                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 786                                         &elen, &offset);
 787                 if (!fi) {
 788                         if (fibh.sbh != fibh.ebh)
 789                                 brelse(fibh.ebh);
 790                         brelse(fibh.sbh);
 791                         brelse(epos.bh);
 792                         return 0;
 793                 }
 794
 795                 if (cfi.lengthFileIdent &&
 796                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 797                         if (fibh.sbh != fibh.ebh)
 798                                 brelse(fibh.ebh);
 799                         brelse(fibh.sbh);
 800                         brelse(epos.bh);
 801                         return 0;
 802                 }
 803         }
 804
 805         if (fibh.sbh != fibh.ebh)
 806                 brelse(fibh.ebh);
 807         brelse(fibh.sbh);
 808         brelse(epos.bh);
 809
 810         return 1;
 811 }
 812
 813 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 814 {
 815         int retval;
 816         struct inode *inode = d_inode(dentry);
 817         struct udf_fileident_bh fibh;
 818         struct fileIdentDesc *fi, cfi;
 819         struct kernel_lb_addr tloc;
 820
 821         retval = -ENOENT;
 822         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 823         if (IS_ERR_OR_NULL(fi)) {
 824                 if (fi)
 825                         retval = PTR_ERR(fi);
 826                 goto out;
 827         }
 828
 829         retval = -EIO;
 830         tloc = lelb_to_cpu(cfi.icb.extLocation);
 831         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 832                 goto end_rmdir;
 833         retval = -ENOTEMPTY;
 834         if (!empty_dir(inode))
 835                 goto end_rmdir;
 836         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 837         if (retval)
 838                 goto end_rmdir;
 839         if (inode->i_nlink != 2)
 840                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%d)\n",
 841                          inode->i_nlink);
 842         clear_nlink(inode);
 843         inode->i_size = 0;
 844         inode_dec_link_count(dir);
 845         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 846                                                 current_time(inode);
 847         mark_inode_dirty(dir);
 848
 849 end_rmdir:
 850         if (fibh.sbh != fibh.ebh)
 851                 brelse(fibh.ebh);
 852         brelse(fibh.sbh);
 853
 854 out:
 855         return retval;
 856 }
 857
 858 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 859 {
 860         int retval;
 861         struct inode *inode = d_inode(dentry);
 862         struct udf_fileident_bh fibh;
 863         struct fileIdentDesc *fi;
 864         struct fileIdentDesc cfi;
 865         struct kernel_lb_addr tloc;
 866
 867         retval = -ENOENT;
 868         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 869
 870         if (IS_ERR_OR_NULL(fi)) {
 871                 if (fi)
 872                         retval = PTR_ERR(fi);
 873                 goto out;
 874         }
 875
 876         retval = -EIO;
 877         tloc = lelb_to_cpu(cfi.icb.extLocation);
 878         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 879                 goto end_unlink;
 880
 881         if (!inode->i_nlink) {
 882                 udf_debug("Deleting nonexistent file (%lu), %d\n",
 883                           inode->i_ino, inode->i_nlink);
 884                 set_nlink(inode, 1);
 885         }
 886         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 887         if (retval)
 888                 goto end_unlink;
 889         dir->i_ctime = dir->i_mtime = current_time(dir);
 890         mark_inode_dirty(dir);
 891         inode_dec_link_count(inode);
 892         inode->i_ctime = dir->i_ctime;
 893         retval = 0;
 894
 895 end_unlink:
 896         if (fibh.sbh != fibh.ebh)
 897                 brelse(fibh.ebh);
 898         brelse(fibh.sbh);
 899
 900 out:
 901         return retval;
 902 }
 903
 904 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 905                        const char *symname)
 906 {
 907         struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO);
 908         struct pathComponent *pc;
 909         const char *compstart;
 910         struct extent_position epos = {};
 911         int eoffset, elen = 0;
 912         uint8_t *ea;
 913         int err;
 914         int block;
 915         unsigned char *name = NULL;
 916         int namelen;
 917         struct udf_inode_info *iinfo;
 918         struct super_block *sb = dir->i_sb;
 919
 920         if (IS_ERR(inode))
 921                 return PTR_ERR(inode);
 922
 923         iinfo = UDF_I(inode);
 924         down_write(&iinfo->i_data_sem);
 925         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 926         if (!name) {
 927                 err = -ENOMEM;
 928                 goto out_no_entry;
 929         }
 930
 931         inode->i_data.a_ops = &udf_symlink_aops;
 932         inode->i_op = &page_symlink_inode_operations;
 933         inode_nohighmem(inode);
 934
 935         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 936                 struct kernel_lb_addr eloc;
 937                 uint32_t bsize;
 938
 939                 block = udf_new_block(sb, inode,
 940                                 iinfo->i_location.partitionReferenceNum,
 941                                 iinfo->i_location.logicalBlockNum, &err);
 942                 if (!block)
 943                         goto out_no_entry;
 944                 epos.block = iinfo->i_location;
 945                 epos.offset = udf_file_entry_alloc_offset(inode);
 946                 epos.bh = NULL;
 947                 eloc.logicalBlockNum = block;
 948                 eloc.partitionReferenceNum =
 949                                 iinfo->i_location.partitionReferenceNum;
 950                 bsize = sb->s_blocksize;
 951                 iinfo->i_lenExtents = bsize;
 952                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 953                 brelse(epos.bh);
 954
 955                 block = udf_get_pblock(sb, block,
 956                                 iinfo->i_location.partitionReferenceNum,
 957                                 0);
 958                 epos.bh = udf_tgetblk(sb, block);
 959                 if (unlikely(!epos.bh)) {
 960                         err = -ENOMEM;
 961                         goto out_no_entry;
 962                 }
 963                 lock_buffer(epos.bh);
 964                 memset(epos.bh->b_data, 0x00, bsize);
 965                 set_buffer_uptodate(epos.bh);
 966                 unlock_buffer(epos.bh);
 967                 mark_buffer_dirty_inode(epos.bh, inode);
 968                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 969         } else
 970                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 971
 972         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 973         pc = (struct pathComponent *)ea;
 974
 975         if (*symname == '/') {
 976                 do {
 977                         symname++;
 978                 } while (*symname == '/');
 979
 980                 pc->componentType = 1;
 981                 pc->lengthComponentIdent = 0;
 982                 pc->componentFileVersionNum = 0;
 983                 elen += sizeof(struct pathComponent);
 984         }
 985
 986         err = -ENAMETOOLONG;
 987
 988         while (*symname) {
 989                 if (elen + sizeof(struct pathComponent) > eoffset)
 990                         goto out_no_entry;
 991
 992                 pc = (struct pathComponent *)(ea + elen);
 993
 994                 compstart = symname;
 995
 996                 do {
 997                         symname++;
 998                 } while (*symname && *symname != '/');
 999
1000                 pc->componentType = 5;
1001                 pc->lengthComponentIdent = 0;
1002                 pc->componentFileVersionNum = 0;
1003                 if (compstart[0] == '.') {
1004                         if ((symname - compstart) == 1)
1005                                 pc->componentType = 4;
1006                         else if ((symname - compstart) == 2 &&
1007                                         compstart[1] == '.')
1008                                 pc->componentType = 3;
1009                 }
1010
1011                 if (pc->componentType == 5) {
1012                         namelen = udf_put_filename(sb, compstart,
1013                                                    symname - compstart,
1014                                                    name, UDF_NAME_LEN_CS0);
1015                         if (!namelen)
1016                                 goto out_no_entry;
1017
1018                         if (elen + sizeof(struct pathComponent) + namelen >
1019                                         eoffset)
1020                                 goto out_no_entry;
1021                         else
1022                                 pc->lengthComponentIdent = namelen;
1023
1024                         memcpy(pc->componentIdent, name, namelen);
1025                 }
1026
1027                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1028
1029                 if (*symname) {
1030                         do {
1031                                 symname++;
1032                         } while (*symname == '/');
1033                 }
1034         }
1035
1036         brelse(epos.bh);
1037         inode->i_size = elen;
1038         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1039                 iinfo->i_lenAlloc = inode->i_size;
1040         else
1041                 udf_truncate_tail_extent(inode);
1042         mark_inode_dirty(inode);
1043         up_write(&iinfo->i_data_sem);
1044
1045         err = udf_add_nondir(dentry, inode);
1046 out:
1047         kfree(name);
1048         return err;
1049
1050 out_no_entry:
1051         up_write(&iinfo->i_data_sem);
1052         inode_dec_link_count(inode);
1053         unlock_new_inode(inode);
1054         iput(inode);
1055         goto out;
1056 }
1057
1058 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1059                     struct dentry *dentry)
1060 {
1061         struct inode *inode = d_inode(old_dentry);
1062         struct udf_fileident_bh fibh;
1063         struct fileIdentDesc cfi, *fi;
1064         int err;
1065
1066         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1067         if (!fi) {
1068                 return err;
1069         }
1070         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1071         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1072         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1073                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1074                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1075         }
1076         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1077         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1078                 mark_inode_dirty(dir);
1079
1080         if (fibh.sbh != fibh.ebh)
1081                 brelse(fibh.ebh);
1082         brelse(fibh.sbh);
1083         inc_nlink(inode);
1084         inode->i_ctime = current_time(inode);
1085         mark_inode_dirty(inode);
1086         dir->i_ctime = dir->i_mtime = current_time(dir);
1087         mark_inode_dirty(dir);
1088         ihold(inode);
1089         d_instantiate(dentry, inode);
1090
1091         return 0;
1092 }
1093
1094 /* Anybody can rename anything with this: the permission checks are left to the
1095  * higher-level routines.
1096  */
1097 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1098                       struct inode *new_dir, struct dentry *new_dentry,
1099                       unsigned int flags)
1100 {
1101         struct inode *old_inode = d_inode(old_dentry);
1102         struct inode *new_inode = d_inode(new_dentry);
1103         struct udf_fileident_bh ofibh, nfibh;
1104         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1105         struct fileIdentDesc ocfi, ncfi;
1106         struct buffer_head *dir_bh = NULL;
1107         int retval = -ENOENT;
1108         struct kernel_lb_addr tloc;
1109         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1110
1111         if (flags & ~RENAME_NOREPLACE)
1112                 return -EINVAL;
1113
1114         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1115         if (IS_ERR(ofi)) {
1116                 retval = PTR_ERR(ofi);
1117                 goto end_rename;
1118         }
1119
1120         if (ofibh.sbh != ofibh.ebh)
1121                 brelse(ofibh.ebh);
1122
1123         brelse(ofibh.sbh);
1124         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1125         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1126             != old_inode->i_ino)
1127                 goto end_rename;
1128
1129         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1130         if (IS_ERR(nfi)) {
1131                 retval = PTR_ERR(nfi);
1132                 goto end_rename;
1133         }
1134         if (nfi && !new_inode) {
1135                 if (nfibh.sbh != nfibh.ebh)
1136                         brelse(nfibh.ebh);
1137                 brelse(nfibh.sbh);
1138                 nfi = NULL;
1139         }
1140         if (S_ISDIR(old_inode->i_mode)) {
1141                 int offset = udf_ext0_offset(old_inode);
1142
1143                 if (new_inode) {
1144                         retval = -ENOTEMPTY;
1145                         if (!empty_dir(new_inode))
1146                                 goto end_rename;
1147                 }
1148                 retval = -EIO;
1149                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1150                         dir_fi = udf_get_fileident(
1151                                         old_iinfo->i_ext.i_data -
1152                                           (old_iinfo->i_efe ?
1153                                            sizeof(struct extendedFileEntry) :
1154                                            sizeof(struct fileEntry)),
1155                                         old_inode->i_sb->s_blocksize, &offset);
1156                 } else {
1157                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1158                         if (!dir_bh)
1159                                 goto end_rename;
1160                         dir_fi = udf_get_fileident(dir_bh->b_data,
1161                                         old_inode->i_sb->s_blocksize, &offset);
1162                 }
1163                 if (!dir_fi)
1164                         goto end_rename;
1165                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1166                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1167                                 old_dir->i_ino)
1168                         goto end_rename;
1169         }
1170         if (!nfi) {
1171                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1172                                     &retval);
1173                 if (!nfi)
1174                         goto end_rename;
1175         }
1176
1177         /*
1178          * Like most other Unix systems, set the ctime for inodes on a
1179          * rename.
1180          */
1181         old_inode->i_ctime = current_time(old_inode);
1182         mark_inode_dirty(old_inode);
1183
1184         /*
1185          * ok, that's it
1186          */
1187         ncfi.fileVersionNum = ocfi.fileVersionNum;
1188         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1189         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(struct long_ad));
1190         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1191
1192         /* The old fid may have moved - find it again */
1193         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1194         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1195
1196         if (new_inode) {
1197                 new_inode->i_ctime = current_time(new_inode);
1198                 inode_dec_link_count(new_inode);
1199         }
1200         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1201         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1202         mark_inode_dirty(old_dir);
1203         mark_inode_dirty(new_dir);
1204
1205         if (dir_fi) {
1206                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1207                 udf_update_tag((char *)dir_fi,
1208                                 (sizeof(struct fileIdentDesc) +
1209                                 le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
1210                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1211                         mark_inode_dirty(old_inode);
1212                 else
1213                         mark_buffer_dirty_inode(dir_bh, old_inode);
1214
1215                 inode_dec_link_count(old_dir);
1216                 if (new_inode)
1217                         inode_dec_link_count(new_inode);
1218                 else {
1219                         inc_nlink(new_dir);
1220                         mark_inode_dirty(new_dir);
1221                 }
1222         }
1223
1224         if (ofi) {
1225                 if (ofibh.sbh != ofibh.ebh)
1226                         brelse(ofibh.ebh);
1227                 brelse(ofibh.sbh);
1228         }
1229
1230         retval = 0;
1231
1232 end_rename:
1233         brelse(dir_bh);
1234         if (nfi) {
1235                 if (nfibh.sbh != nfibh.ebh)
1236                         brelse(nfibh.ebh);
1237                 brelse(nfibh.sbh);
1238         }
1239
1240         return retval;
1241 }
1242
1243 static struct dentry *udf_get_parent(struct dentry *child)
1244 {
1245         struct kernel_lb_addr tloc;
1246         struct inode *inode = NULL;
1247         struct qstr dotdot = QSTR_INIT("..", 2);
1248         struct fileIdentDesc cfi;
1249         struct udf_fileident_bh fibh;
1250
1251         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1252                 return ERR_PTR(-EACCES);
1253
1254         if (fibh.sbh != fibh.ebh)
1255                 brelse(fibh.ebh);
1256         brelse(fibh.sbh);
1257
1258         tloc = lelb_to_cpu(cfi.icb.extLocation);
1259         inode = udf_iget(child->d_sb, &tloc);
1260         if (IS_ERR(inode))
1261                 return ERR_CAST(inode);
1262
1263         return d_obtain_alias(inode);
1264 }
1265
1266
1267 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1268                                         u16 partref, __u32 generation)
1269 {
1270         struct inode *inode;
1271         struct kernel_lb_addr loc;
1272
1273         if (block == 0)
1274                 return ERR_PTR(-ESTALE);
1275
1276         loc.logicalBlockNum = block;
1277         loc.partitionReferenceNum = partref;
1278         inode = udf_iget(sb, &loc);
1279
1280         if (IS_ERR(inode))
1281                 return ERR_CAST(inode);
1282
1283         if (generation && inode->i_generation != generation) {
1284                 iput(inode);
1285                 return ERR_PTR(-ESTALE);
1286         }
1287         return d_obtain_alias(inode);
1288 }
1289
1290 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1291                                        struct fid *fid, int fh_len, int fh_type)
1292 {
1293         if (fh_len < 3 ||
1294             (fh_type != FILEID_UDF_WITH_PARENT &&
1295              fh_type != FILEID_UDF_WITHOUT_PARENT))
1296                 return NULL;
1297
1298         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1299                         fid->udf.generation);
1300 }
1301
1302 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1303                                        struct fid *fid, int fh_len, int fh_type)
1304 {
1305         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1306                 return NULL;
1307
1308         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1309                                  fid->udf.parent_partref,
1310                                  fid->udf.parent_generation);
1311 }
1312 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1313                          struct inode *parent)
1314 {
1315         int len = *lenp;
1316         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1317         struct fid *fid = (struct fid *)fh;
1318         int type = FILEID_UDF_WITHOUT_PARENT;
1319
1320         if (parent && (len < 5)) {
1321                 *lenp = 5;
1322                 return FILEID_INVALID;
1323         } else if (len < 3) {
1324                 *lenp = 3;
1325                 return FILEID_INVALID;
1326         }
1327
1328         *lenp = 3;
1329         fid->udf.block = location.logicalBlockNum;
1330         fid->udf.partref = location.partitionReferenceNum;
1331         fid->udf.parent_partref = 0;
1332         fid->udf.generation = inode->i_generation;
1333
1334         if (parent) {
1335                 location = UDF_I(parent)->i_location;
1336                 fid->udf.parent_block = location.logicalBlockNum;
1337                 fid->udf.parent_partref = location.partitionReferenceNum;
1338                 fid->udf.parent_generation = inode->i_generation;
1339                 *lenp = 5;
1340                 type = FILEID_UDF_WITH_PARENT;
1341         }
1342
1343         return type;
1344 }
1345
1346 const struct export_operations udf_export_ops = {
1347         .encode_fh      = udf_encode_fh,
1348         .fh_to_dentry   = udf_fh_to_dentry,
1349         .fh_to_parent   = udf_fh_to_parent,
1350         .get_parent     = udf_get_parent,
1351 };
1352
1353 const struct inode_operations udf_dir_inode_operations = {
1354         .lookup                         = udf_lookup,
1355         .create                         = udf_create,
1356         .link                           = udf_link,
1357         .unlink                         = udf_unlink,
1358         .symlink                        = udf_symlink,
1359         .mkdir                          = udf_mkdir,
1360         .rmdir                          = udf_rmdir,
1361         .mknod                          = udf_mknod,
1362         .rename                         = udf_rename,
1363         .tmpfile                        = udf_tmpfile,
1364 };