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