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         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 308         if (IS_ERR(fi))
 309                 return ERR_CAST(fi);
 310
 311         if (fi) {
 312                 struct kernel_lb_addr loc;
 313
 314                 if (fibh.sbh != fibh.ebh)
 315                         brelse(fibh.ebh);
 316                 brelse(fibh.sbh);
 317
 318                 loc = lelb_to_cpu(cfi.icb.extLocation);
 319                 inode = udf_iget(dir->i_sb, &loc);
 320                 if (IS_ERR(inode))
 321                         return ERR_CAST(inode);
 322         }
 323
 324         return d_splice_alias(inode, dentry);
 325 }
 326
 327 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 328                                            struct dentry *dentry,
 329                                            struct udf_fileident_bh *fibh,
 330                                            struct fileIdentDesc *cfi, int *err)
 331 {
 332         struct super_block *sb = dir->i_sb;
 333         struct fileIdentDesc *fi = NULL;
 334         unsigned char *name = NULL;
 335         int namelen;
 336         loff_t f_pos;
 337         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 338         int nfidlen;
 339         udf_pblk_t block;
 340         struct kernel_lb_addr eloc;
 341         uint32_t elen = 0;
 342         sector_t offset;
 343         struct extent_position epos = {};
 344         struct udf_inode_info *dinfo;
 345
 346         fibh->sbh = fibh->ebh = NULL;
 347         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 348         if (!name) {
 349                 *err = -ENOMEM;
 350                 goto out_err;
 351         }
 352
 353         if (dentry) {
 354                 if (!dentry->d_name.len) {
 355                         *err = -EINVAL;
 356                         goto out_err;
 357                 }
 358                 namelen = udf_put_filename(sb, dentry->d_name.name,
 359                                            dentry->d_name.len,
 360                                            name, UDF_NAME_LEN_CS0);
 361                 if (!namelen) {
 362                         *err = -ENAMETOOLONG;
 363                         goto out_err;
 364                 }
 365         } else {
 366                 namelen = 0;
 367         }
 368
 369         nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 370
 371         f_pos = udf_ext0_offset(dir);
 372
 373         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 374         dinfo = UDF_I(dir);
 375         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 376                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 377                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 378                         block = udf_get_lb_pblock(dir->i_sb,
 379                                         &dinfo->i_location, 0);
 380                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 381                         goto add;
 382                 }
 383                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 384                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 385                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 386                                 epos.offset -= sizeof(struct short_ad);
 387                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 388                                 epos.offset -= sizeof(struct long_ad);
 389                 } else
 390                         offset = 0;
 391
 392                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 393                 if (!fibh->sbh) {
 394                         *err = -EIO;
 395                         goto out_err;
 396                 }
 397
 398                 block = dinfo->i_location.logicalBlockNum;
 399         }
 400
 401         while (f_pos < size) {
 402                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 403                                         &elen, &offset);
 404
 405                 if (!fi) {
 406                         *err = -EIO;
 407                         goto out_err;
 408                 }
 409
 410                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 411                         if (udf_dir_entry_len(cfi) == nfidlen) {
 412                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 413                                 cfi->fileVersionNum = cpu_to_le16(1);
 414                                 cfi->fileCharacteristics = 0;
 415                                 cfi->lengthFileIdent = namelen;
 416                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 417                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 418                                                   name))
 419                                         goto out_ok;
 420                                 else {
 421                                         *err = -EIO;
 422                                         goto out_err;
 423                                 }
 424                         }
 425                 }
 426         }
 427
 428 add:
 429         f_pos += nfidlen;
 430
 431         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 432             sb->s_blocksize - fibh->eoffset < nfidlen) {
 433                 brelse(epos.bh);
 434                 epos.bh = NULL;
 435                 fibh->soffset -= udf_ext0_offset(dir);
 436                 fibh->eoffset -= udf_ext0_offset(dir);
 437                 f_pos -= udf_ext0_offset(dir);
 438                 if (fibh->sbh != fibh->ebh)
 439                         brelse(fibh->ebh);
 440                 brelse(fibh->sbh);
 441                 fibh->sbh = fibh->ebh =
 442                                 udf_expand_dir_adinicb(dir, &block, err);
 443                 if (!fibh->sbh)
 444                         goto out_err;
 445                 epos.block = dinfo->i_location;
 446                 epos.offset = udf_file_entry_alloc_offset(dir);
 447                 /* Load extent udf_expand_dir_adinicb() has created */
 448                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 449         }
 450
 451         /* Entry fits into current block? */
 452         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 453                 fibh->soffset = fibh->eoffset;
 454                 fibh->eoffset += nfidlen;
 455                 if (fibh->sbh != fibh->ebh) {
 456                         brelse(fibh->sbh);
 457                         fibh->sbh = fibh->ebh;
 458                 }
 459
 460                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 461                         block = dinfo->i_location.logicalBlockNum;
 462                         fi = (struct fileIdentDesc *)
 463                                         (dinfo->i_data + fibh->soffset -
 464                                          udf_ext0_offset(dir) +
 465                                          dinfo->i_lenEAttr);
 466                 } else {
 467                         block = eloc.logicalBlockNum +
 468                                         ((elen - 1) >>
 469                                                 dir->i_sb->s_blocksize_bits);
 470                         fi = (struct fileIdentDesc *)
 471                                 (fibh->sbh->b_data + fibh->soffset);
 472                 }
 473         } else {
 474                 /* Round up last extent in the file */
 475                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 476                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 477                         epos.offset -= sizeof(struct short_ad);
 478                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 479                         epos.offset -= sizeof(struct long_ad);
 480                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 481                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 482                                         - 1) & ~(sb->s_blocksize - 1);
 483
 484                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 485                 fibh->eoffset += nfidlen - sb->s_blocksize;
 486                 if (fibh->sbh != fibh->ebh) {
 487                         brelse(fibh->sbh);
 488                         fibh->sbh = fibh->ebh;
 489                 }
 490
 491                 block = eloc.logicalBlockNum + ((elen - 1) >>
 492                                                 dir->i_sb->s_blocksize_bits);
 493                 fibh->ebh = udf_bread(dir,
 494                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 495                 if (!fibh->ebh)
 496                         goto out_err;
 497                 /* Extents could have been merged, invalidate our position */
 498                 brelse(epos.bh);
 499                 epos.bh = NULL;
 500                 epos.block = dinfo->i_location;
 501                 epos.offset = udf_file_entry_alloc_offset(dir);
 502
 503                 if (!fibh->soffset) {
 504                         /* Find the freshly allocated block */
 505                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 506                                 (EXT_RECORDED_ALLOCATED >> 30))
 507                                 ;
 508                         block = eloc.logicalBlockNum + ((elen - 1) >>
 509                                         dir->i_sb->s_blocksize_bits);
 510                         brelse(fibh->sbh);
 511                         fibh->sbh = fibh->ebh;
 512                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 513                 } else {
 514                         fi = (struct fileIdentDesc *)
 515                                 (fibh->sbh->b_data + sb->s_blocksize +
 516                                         fibh->soffset);
 517                 }
 518         }
 519
 520         memset(cfi, 0, sizeof(struct fileIdentDesc));
 521         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 522                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 523                             sizeof(struct tag));
 524         else
 525                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 526                             sizeof(struct tag));
 527         cfi->fileVersionNum = cpu_to_le16(1);
 528         cfi->lengthFileIdent = namelen;
 529         cfi->lengthOfImpUse = cpu_to_le16(0);
 530         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 531                 dir->i_size += nfidlen;
 532                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 533                         dinfo->i_lenAlloc += nfidlen;
 534                 else {
 535                         /* Find the last extent and truncate it to proper size */
 536                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 537                                 (EXT_RECORDED_ALLOCATED >> 30))
 538                                 ;
 539                         elen -= dinfo->i_lenExtents - dir->i_size;
 540                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 541                                 epos.offset -= sizeof(struct short_ad);
 542                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 543                                 epos.offset -= sizeof(struct long_ad);
 544                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 545                         dinfo->i_lenExtents = dir->i_size;
 546                 }
 547
 548                 mark_inode_dirty(dir);
 549                 goto out_ok;
 550         } else {
 551                 *err = -EIO;
 552                 goto out_err;
 553         }
 554
 555 out_err:
 556         fi = NULL;
 557         if (fibh->sbh != fibh->ebh)
 558                 brelse(fibh->ebh);
 559         brelse(fibh->sbh);
 560 out_ok:
 561         brelse(epos.bh);
 562         kfree(name);
 563         return fi;
 564 }
 565
 566 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 567                             struct udf_fileident_bh *fibh,
 568                             struct fileIdentDesc *cfi)
 569 {
 570         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 571
 572         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 573                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 574
 575         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 576 }
 577
 578 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 579 {
 580         struct udf_inode_info *iinfo = UDF_I(inode);
 581         struct inode *dir = d_inode(dentry->d_parent);
 582         struct udf_fileident_bh fibh;
 583         struct fileIdentDesc cfi, *fi;
 584         int err;
 585
 586         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 587         if (unlikely(!fi)) {
 588                 inode_dec_link_count(inode);
 589                 discard_new_inode(inode);
 590                 return err;
 591         }
 592         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 593         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 594         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 595                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 596         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 597         dir->i_ctime = dir->i_mtime = current_time(dir);
 598         mark_inode_dirty(dir);
 599         if (fibh.sbh != fibh.ebh)
 600                 brelse(fibh.ebh);
 601         brelse(fibh.sbh);
 602         d_instantiate_new(dentry, inode);
 603
 604         return 0;
 605 }
 606
 607 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 608                       bool excl)
 609 {
 610         struct inode *inode = udf_new_inode(dir, mode);
 611
 612         if (IS_ERR(inode))
 613                 return PTR_ERR(inode);
 614
 615         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 616                 inode->i_data.a_ops = &udf_adinicb_aops;
 617         else
 618                 inode->i_data.a_ops = &udf_aops;
 619         inode->i_op = &udf_file_inode_operations;
 620         inode->i_fop = &udf_file_operations;
 621         mark_inode_dirty(inode);
 622
 623         return udf_add_nondir(dentry, inode);
 624 }
 625
 626 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 627 {
 628         struct inode *inode = udf_new_inode(dir, mode);
 629
 630         if (IS_ERR(inode))
 631                 return PTR_ERR(inode);
 632
 633         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 634                 inode->i_data.a_ops = &udf_adinicb_aops;
 635         else
 636                 inode->i_data.a_ops = &udf_aops;
 637         inode->i_op = &udf_file_inode_operations;
 638         inode->i_fop = &udf_file_operations;
 639         mark_inode_dirty(inode);
 640         d_tmpfile(dentry, inode);
 641         unlock_new_inode(inode);
 642         return 0;
 643 }
 644
 645 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 646                      dev_t rdev)
 647 {
 648         struct inode *inode;
 649
 650         if (!old_valid_dev(rdev))
 651                 return -EINVAL;
 652
 653         inode = udf_new_inode(dir, mode);
 654         if (IS_ERR(inode))
 655                 return PTR_ERR(inode);
 656
 657         init_special_inode(inode, mode, rdev);
 658         return udf_add_nondir(dentry, inode);
 659 }
 660
 661 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 662 {
 663         struct inode *inode;
 664         struct udf_fileident_bh fibh;
 665         struct fileIdentDesc cfi, *fi;
 666         int err;
 667         struct udf_inode_info *dinfo = UDF_I(dir);
 668         struct udf_inode_info *iinfo;
 669
 670         inode = udf_new_inode(dir, S_IFDIR | mode);
 671         if (IS_ERR(inode))
 672                 return PTR_ERR(inode);
 673
 674         iinfo = UDF_I(inode);
 675         inode->i_op = &udf_dir_inode_operations;
 676         inode->i_fop = &udf_dir_operations;
 677         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 678         if (!fi) {
 679                 inode_dec_link_count(inode);
 680                 discard_new_inode(inode);
 681                 goto out;
 682         }
 683         set_nlink(inode, 2);
 684         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 685         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 686         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 687                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 688         cfi.fileCharacteristics =
 689                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 690         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 691         brelse(fibh.sbh);
 692         mark_inode_dirty(inode);
 693
 694         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 695         if (!fi) {
 696                 clear_nlink(inode);
 697                 mark_inode_dirty(inode);
 698                 discard_new_inode(inode);
 699                 goto out;
 700         }
 701         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 702         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 703         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 704                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 705         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 706         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 707         inc_nlink(dir);
 708         dir->i_ctime = dir->i_mtime = current_time(dir);
 709         mark_inode_dirty(dir);
 710         d_instantiate_new(dentry, inode);
 711         if (fibh.sbh != fibh.ebh)
 712                 brelse(fibh.ebh);
 713         brelse(fibh.sbh);
 714         err = 0;
 715
 716 out:
 717         return err;
 718 }
 719
 720 static int empty_dir(struct inode *dir)
 721 {
 722         struct fileIdentDesc *fi, cfi;
 723         struct udf_fileident_bh fibh;
 724         loff_t f_pos;
 725         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 726         udf_pblk_t block;
 727         struct kernel_lb_addr eloc;
 728         uint32_t elen;
 729         sector_t offset;
 730         struct extent_position epos = {};
 731         struct udf_inode_info *dinfo = UDF_I(dir);
 732
 733         f_pos = udf_ext0_offset(dir);
 734         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 735
 736         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 737                 fibh.sbh = fibh.ebh = NULL;
 738         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 739                               &epos, &eloc, &elen, &offset) ==
 740                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 741                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 742                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 743                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 744                                 epos.offset -= sizeof(struct short_ad);
 745                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 746                                 epos.offset -= sizeof(struct long_ad);
 747                 } else
 748                         offset = 0;
 749
 750                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 751                 if (!fibh.sbh) {
 752                         brelse(epos.bh);
 753                         return 0;
 754                 }
 755         } else {
 756                 brelse(epos.bh);
 757                 return 0;
 758         }
 759
 760         while (f_pos < size) {
 761                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 762                                         &elen, &offset);
 763                 if (!fi) {
 764                         if (fibh.sbh != fibh.ebh)
 765                                 brelse(fibh.ebh);
 766                         brelse(fibh.sbh);
 767                         brelse(epos.bh);
 768                         return 0;
 769                 }
 770
 771                 if (cfi.lengthFileIdent &&
 772                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 773                         if (fibh.sbh != fibh.ebh)
 774                                 brelse(fibh.ebh);
 775                         brelse(fibh.sbh);
 776                         brelse(epos.bh);
 777                         return 0;
 778                 }
 779         }
 780
 781         if (fibh.sbh != fibh.ebh)
 782                 brelse(fibh.ebh);
 783         brelse(fibh.sbh);
 784         brelse(epos.bh);
 785
 786         return 1;
 787 }
 788
 789 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 790 {
 791         int retval;
 792         struct inode *inode = d_inode(dentry);
 793         struct udf_fileident_bh fibh;
 794         struct fileIdentDesc *fi, cfi;
 795         struct kernel_lb_addr tloc;
 796
 797         retval = -ENOENT;
 798         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 799         if (IS_ERR_OR_NULL(fi)) {
 800                 if (fi)
 801                         retval = PTR_ERR(fi);
 802                 goto out;
 803         }
 804
 805         retval = -EIO;
 806         tloc = lelb_to_cpu(cfi.icb.extLocation);
 807         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 808                 goto end_rmdir;
 809         retval = -ENOTEMPTY;
 810         if (!empty_dir(inode))
 811                 goto end_rmdir;
 812         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 813         if (retval)
 814                 goto end_rmdir;
 815         if (inode->i_nlink != 2)
 816                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 817                          inode->i_nlink);
 818         clear_nlink(inode);
 819         inode->i_size = 0;
 820         inode_dec_link_count(dir);
 821         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 822                                                 current_time(inode);
 823         mark_inode_dirty(dir);
 824
 825 end_rmdir:
 826         if (fibh.sbh != fibh.ebh)
 827                 brelse(fibh.ebh);
 828         brelse(fibh.sbh);
 829
 830 out:
 831         return retval;
 832 }
 833
 834 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 835 {
 836         int retval;
 837         struct inode *inode = d_inode(dentry);
 838         struct udf_fileident_bh fibh;
 839         struct fileIdentDesc *fi;
 840         struct fileIdentDesc cfi;
 841         struct kernel_lb_addr tloc;
 842
 843         retval = -ENOENT;
 844         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 845
 846         if (IS_ERR_OR_NULL(fi)) {
 847                 if (fi)
 848                         retval = PTR_ERR(fi);
 849                 goto out;
 850         }
 851
 852         retval = -EIO;
 853         tloc = lelb_to_cpu(cfi.icb.extLocation);
 854         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 855                 goto end_unlink;
 856
 857         if (!inode->i_nlink) {
 858                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 859                           inode->i_ino, inode->i_nlink);
 860                 set_nlink(inode, 1);
 861         }
 862         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 863         if (retval)
 864                 goto end_unlink;
 865         dir->i_ctime = dir->i_mtime = current_time(dir);
 866         mark_inode_dirty(dir);
 867         inode_dec_link_count(inode);
 868         inode->i_ctime = dir->i_ctime;
 869         retval = 0;
 870
 871 end_unlink:
 872         if (fibh.sbh != fibh.ebh)
 873                 brelse(fibh.ebh);
 874         brelse(fibh.sbh);
 875
 876 out:
 877         return retval;
 878 }
 879
 880 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 881                        const char *symname)
 882 {
 883         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 884         struct pathComponent *pc;
 885         const char *compstart;
 886         struct extent_position epos = {};
 887         int eoffset, elen = 0;
 888         uint8_t *ea;
 889         int err;
 890         udf_pblk_t block;
 891         unsigned char *name = NULL;
 892         int namelen;
 893         struct udf_inode_info *iinfo;
 894         struct super_block *sb = dir->i_sb;
 895
 896         if (IS_ERR(inode))
 897                 return PTR_ERR(inode);
 898
 899         iinfo = UDF_I(inode);
 900         down_write(&iinfo->i_data_sem);
 901         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 902         if (!name) {
 903                 err = -ENOMEM;
 904                 goto out_no_entry;
 905         }
 906
 907         inode->i_data.a_ops = &udf_symlink_aops;
 908         inode->i_op = &udf_symlink_inode_operations;
 909         inode_nohighmem(inode);
 910
 911         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 912                 struct kernel_lb_addr eloc;
 913                 uint32_t bsize;
 914
 915                 block = udf_new_block(sb, inode,
 916                                 iinfo->i_location.partitionReferenceNum,
 917                                 iinfo->i_location.logicalBlockNum, &err);
 918                 if (!block)
 919                         goto out_no_entry;
 920                 epos.block = iinfo->i_location;
 921                 epos.offset = udf_file_entry_alloc_offset(inode);
 922                 epos.bh = NULL;
 923                 eloc.logicalBlockNum = block;
 924                 eloc.partitionReferenceNum =
 925                                 iinfo->i_location.partitionReferenceNum;
 926                 bsize = sb->s_blocksize;
 927                 iinfo->i_lenExtents = bsize;
 928                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 929                 brelse(epos.bh);
 930
 931                 block = udf_get_pblock(sb, block,
 932                                 iinfo->i_location.partitionReferenceNum,
 933                                 0);
 934                 epos.bh = udf_tgetblk(sb, block);
 935                 lock_buffer(epos.bh);
 936                 memset(epos.bh->b_data, 0x00, bsize);
 937                 set_buffer_uptodate(epos.bh);
 938                 unlock_buffer(epos.bh);
 939                 mark_buffer_dirty_inode(epos.bh, inode);
 940                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 941         } else
 942                 ea = iinfo->i_data + iinfo->i_lenEAttr;
 943
 944         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 945         pc = (struct pathComponent *)ea;
 946
 947         if (*symname == '/') {
 948                 do {
 949                         symname++;
 950                 } while (*symname == '/');
 951
 952                 pc->componentType = 1;
 953                 pc->lengthComponentIdent = 0;
 954                 pc->componentFileVersionNum = 0;
 955                 elen += sizeof(struct pathComponent);
 956         }
 957
 958         err = -ENAMETOOLONG;
 959
 960         while (*symname) {
 961                 if (elen + sizeof(struct pathComponent) > eoffset)
 962                         goto out_no_entry;
 963
 964                 pc = (struct pathComponent *)(ea + elen);
 965
 966                 compstart = symname;
 967
 968                 do {
 969                         symname++;
 970                 } while (*symname && *symname != '/');
 971
 972                 pc->componentType = 5;
 973                 pc->lengthComponentIdent = 0;
 974                 pc->componentFileVersionNum = 0;
 975                 if (compstart[0] == '.') {
 976                         if ((symname - compstart) == 1)
 977                                 pc->componentType = 4;
 978                         else if ((symname - compstart) == 2 &&
 979                                         compstart[1] == '.')
 980                                 pc->componentType = 3;
 981                 }
 982
 983                 if (pc->componentType == 5) {
 984                         namelen = udf_put_filename(sb, compstart,
 985                                                    symname - compstart,
 986                                                    name, UDF_NAME_LEN_CS0);
 987                         if (!namelen)
 988                                 goto out_no_entry;
 989
 990                         if (elen + sizeof(struct pathComponent) + namelen >
 991                                         eoffset)
 992                                 goto out_no_entry;
 993                         else
 994                                 pc->lengthComponentIdent = namelen;
 995
 996                         memcpy(pc->componentIdent, name, namelen);
 997                 }
 998
 999                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1000
1001                 if (*symname) {
1002                         do {
1003                                 symname++;
1004                         } while (*symname == '/');
1005                 }
1006         }
1007
1008         brelse(epos.bh);
1009         inode->i_size = elen;
1010         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1011                 iinfo->i_lenAlloc = inode->i_size;
1012         else
1013                 udf_truncate_tail_extent(inode);
1014         mark_inode_dirty(inode);
1015         up_write(&iinfo->i_data_sem);
1016
1017         err = udf_add_nondir(dentry, inode);
1018 out:
1019         kfree(name);
1020         return err;
1021
1022 out_no_entry:
1023         up_write(&iinfo->i_data_sem);
1024         inode_dec_link_count(inode);
1025         discard_new_inode(inode);
1026         goto out;
1027 }
1028
1029 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1030                     struct dentry *dentry)
1031 {
1032         struct inode *inode = d_inode(old_dentry);
1033         struct udf_fileident_bh fibh;
1034         struct fileIdentDesc cfi, *fi;
1035         int err;
1036
1037         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
1038         if (!fi) {
1039                 return err;
1040         }
1041         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
1042         cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
1043         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
1044                 *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
1045                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
1046         }
1047         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
1048         if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1049                 mark_inode_dirty(dir);
1050
1051         if (fibh.sbh != fibh.ebh)
1052                 brelse(fibh.ebh);
1053         brelse(fibh.sbh);
1054         inc_nlink(inode);
1055         inode->i_ctime = current_time(inode);
1056         mark_inode_dirty(inode);
1057         dir->i_ctime = dir->i_mtime = current_time(dir);
1058         mark_inode_dirty(dir);
1059         ihold(inode);
1060         d_instantiate(dentry, inode);
1061
1062         return 0;
1063 }
1064
1065 /* Anybody can rename anything with this: the permission checks are left to the
1066  * higher-level routines.
1067  */
1068 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1069                       struct inode *new_dir, struct dentry *new_dentry,
1070                       unsigned int flags)
1071 {
1072         struct inode *old_inode = d_inode(old_dentry);
1073         struct inode *new_inode = d_inode(new_dentry);
1074         struct udf_fileident_bh ofibh, nfibh;
1075         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1076         struct fileIdentDesc ocfi, ncfi;
1077         struct buffer_head *dir_bh = NULL;
1078         int retval = -ENOENT;
1079         struct kernel_lb_addr tloc;
1080         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1081
1082         if (flags & ~RENAME_NOREPLACE)
1083                 return -EINVAL;
1084
1085         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1086         if (IS_ERR(ofi)) {
1087                 retval = PTR_ERR(ofi);
1088                 goto end_rename;
1089         }
1090
1091         if (ofibh.sbh != ofibh.ebh)
1092                 brelse(ofibh.ebh);
1093
1094         brelse(ofibh.sbh);
1095         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1096         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1097             != old_inode->i_ino)
1098                 goto end_rename;
1099
1100         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1101         if (IS_ERR(nfi)) {
1102                 retval = PTR_ERR(nfi);
1103                 goto end_rename;
1104         }
1105         if (nfi && !new_inode) {
1106                 if (nfibh.sbh != nfibh.ebh)
1107                         brelse(nfibh.ebh);
1108                 brelse(nfibh.sbh);
1109                 nfi = NULL;
1110         }
1111         if (S_ISDIR(old_inode->i_mode)) {
1112                 int offset = udf_ext0_offset(old_inode);
1113
1114                 if (new_inode) {
1115                         retval = -ENOTEMPTY;
1116                         if (!empty_dir(new_inode))
1117                                 goto end_rename;
1118                 }
1119                 retval = -EIO;
1120                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1121                         dir_fi = udf_get_fileident(
1122                                         old_iinfo->i_data -
1123                                           (old_iinfo->i_efe ?
1124                                            sizeof(struct extendedFileEntry) :
1125                                            sizeof(struct fileEntry)),
1126                                         old_inode->i_sb->s_blocksize, &offset);
1127                 } else {
1128                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1129                         if (!dir_bh)
1130                                 goto end_rename;
1131                         dir_fi = udf_get_fileident(dir_bh->b_data,
1132                                         old_inode->i_sb->s_blocksize, &offset);
1133                 }
1134                 if (!dir_fi)
1135                         goto end_rename;
1136                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1137                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1138                                 old_dir->i_ino)
1139                         goto end_rename;
1140         }
1141         if (!nfi) {
1142                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1143                                     &retval);
1144                 if (!nfi)
1145                         goto end_rename;
1146         }
1147
1148         /*
1149          * Like most other Unix systems, set the ctime for inodes on a
1150          * rename.
1151          */
1152         old_inode->i_ctime = current_time(old_inode);
1153         mark_inode_dirty(old_inode);
1154
1155         /*
1156          * ok, that's it
1157          */
1158         ncfi.fileVersionNum = ocfi.fileVersionNum;
1159         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1160         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1161         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1162
1163         /* The old fid may have moved - find it again */
1164         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1165         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1166
1167         if (new_inode) {
1168                 new_inode->i_ctime = current_time(new_inode);
1169                 inode_dec_link_count(new_inode);
1170         }
1171         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1172         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1173         mark_inode_dirty(old_dir);
1174         mark_inode_dirty(new_dir);
1175
1176         if (dir_fi) {
1177                 dir_fi->icb.extLocation = cpu_to_lelb(UDF_I(new_dir)->i_location);
1178                 udf_update_tag((char *)dir_fi, udf_dir_entry_len(dir_fi));
1179                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1180                         mark_inode_dirty(old_inode);
1181                 else
1182                         mark_buffer_dirty_inode(dir_bh, old_inode);
1183
1184                 inode_dec_link_count(old_dir);
1185                 if (new_inode)
1186                         inode_dec_link_count(new_inode);
1187                 else {
1188                         inc_nlink(new_dir);
1189                         mark_inode_dirty(new_dir);
1190                 }
1191         }
1192
1193         if (ofi) {
1194                 if (ofibh.sbh != ofibh.ebh)
1195                         brelse(ofibh.ebh);
1196                 brelse(ofibh.sbh);
1197         }
1198
1199         retval = 0;
1200
1201 end_rename:
1202         brelse(dir_bh);
1203         if (nfi) {
1204                 if (nfibh.sbh != nfibh.ebh)
1205                         brelse(nfibh.ebh);
1206                 brelse(nfibh.sbh);
1207         }
1208
1209         return retval;
1210 }
1211
1212 static struct dentry *udf_get_parent(struct dentry *child)
1213 {
1214         struct kernel_lb_addr tloc;
1215         struct inode *inode = NULL;
1216         struct qstr dotdot = QSTR_INIT("..", 2);
1217         struct fileIdentDesc cfi;
1218         struct udf_fileident_bh fibh;
1219
1220         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1221                 return ERR_PTR(-EACCES);
1222
1223         if (fibh.sbh != fibh.ebh)
1224                 brelse(fibh.ebh);
1225         brelse(fibh.sbh);
1226
1227         tloc = lelb_to_cpu(cfi.icb.extLocation);
1228         inode = udf_iget(child->d_sb, &tloc);
1229         if (IS_ERR(inode))
1230                 return ERR_CAST(inode);
1231
1232         return d_obtain_alias(inode);
1233 }
1234
1235
1236 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1237                                         u16 partref, __u32 generation)
1238 {
1239         struct inode *inode;
1240         struct kernel_lb_addr loc;
1241
1242         if (block == 0)
1243                 return ERR_PTR(-ESTALE);
1244
1245         loc.logicalBlockNum = block;
1246         loc.partitionReferenceNum = partref;
1247         inode = udf_iget(sb, &loc);
1248
1249         if (IS_ERR(inode))
1250                 return ERR_CAST(inode);
1251
1252         if (generation && inode->i_generation != generation) {
1253                 iput(inode);
1254                 return ERR_PTR(-ESTALE);
1255         }
1256         return d_obtain_alias(inode);
1257 }
1258
1259 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1260                                        struct fid *fid, int fh_len, int fh_type)
1261 {
1262         if (fh_len < 3 ||
1263             (fh_type != FILEID_UDF_WITH_PARENT &&
1264              fh_type != FILEID_UDF_WITHOUT_PARENT))
1265                 return NULL;
1266
1267         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1268                         fid->udf.generation);
1269 }
1270
1271 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1272                                        struct fid *fid, int fh_len, int fh_type)
1273 {
1274         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1275                 return NULL;
1276
1277         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1278                                  fid->udf.parent_partref,
1279                                  fid->udf.parent_generation);
1280 }
1281 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1282                          struct inode *parent)
1283 {
1284         int len = *lenp;
1285         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1286         struct fid *fid = (struct fid *)fh;
1287         int type = FILEID_UDF_WITHOUT_PARENT;
1288
1289         if (parent && (len < 5)) {
1290                 *lenp = 5;
1291                 return FILEID_INVALID;
1292         } else if (len < 3) {
1293                 *lenp = 3;
1294                 return FILEID_INVALID;
1295         }
1296
1297         *lenp = 3;
1298         fid->udf.block = location.logicalBlockNum;
1299         fid->udf.partref = location.partitionReferenceNum;
1300         fid->udf.parent_partref = 0;
1301         fid->udf.generation = inode->i_generation;
1302
1303         if (parent) {
1304                 location = UDF_I(parent)->i_location;
1305                 fid->udf.parent_block = location.logicalBlockNum;
1306                 fid->udf.parent_partref = location.partitionReferenceNum;
1307                 fid->udf.parent_generation = inode->i_generation;
1308                 *lenp = 5;
1309                 type = FILEID_UDF_WITH_PARENT;
1310         }
1311
1312         return type;
1313 }
1314
1315 const struct export_operations udf_export_ops = {
1316         .encode_fh      = udf_encode_fh,
1317         .fh_to_dentry   = udf_fh_to_dentry,
1318         .fh_to_parent   = udf_fh_to_parent,
1319         .get_parent     = udf_get_parent,
1320 };
1321
1322 const struct inode_operations udf_dir_inode_operations = {
1323         .lookup                         = udf_lookup,
1324         .create                         = udf_create,
1325         .link                           = udf_link,
1326         .unlink                         = udf_unlink,
1327         .symlink                        = udf_symlink,
1328         .mkdir                          = udf_mkdir,
1329         .rmdir                          = udf_rmdir,
1330         .mknod                          = udf_mknod,
1331         .rename                         = udf_rename,
1332         .tmpfile                        = udf_tmpfile,
1333 };