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