fs/udf/namei.c

   1 /*
   2  * namei.c
   3  *
   4  * PURPOSE
   5  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   6  *
   7  * COPYRIGHT
   8  *      This file is distributed under the terms of the GNU General Public
   9  *      License (GPL). Copies of the GPL can be obtained from:
  10  *              ftp://prep.ai.mit.edu/pub/gnu/GPL
  11  *      Each contributing author retains all rights to their own work.
  12  *
  13  *  (C) 1998-2004 Ben Fennema
  14  *  (C) 1999-2000 Stelias Computing Inc
  15  *
  16  * HISTORY
  17  *
  18  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  19  *  04/19/99 blf  link, mknod, symlink support
  20  */
  21
  22 #include "udfdecl.h"
  23
  24 #include "udf_i.h"
  25 #include "udf_sb.h"
  26 #include <linux/string.h>
  27 #include <linux/errno.h>
  28 #include <linux/mm.h>
  29 #include <linux/slab.h>
  30 #include <linux/sched.h>
  31 #include <linux/crc-itu-t.h>
  32 #include <linux/exportfs.h>
  33
  34 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  35                             const unsigned char *name2)
  36 {
  37         if (len1 != len2)
  38                 return 0;
  39
  40         return !memcmp(name1, name2, len1);
  41 }
  42
  43 int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
  44                  struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
  45                  uint8_t *impuse, uint8_t *fileident)
  46 {
  47         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(struct tag);
  48         uint16_t crc;
  49         int offset;
  50         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
  51         uint8_t lfi = cfi->lengthFileIdent;
  52         int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
  53                 sizeof(struct fileIdentDesc);
  54         int adinicb = 0;
  55
  56         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
  57                 adinicb = 1;
  58
  59         offset = fibh->soffset + sizeof(struct fileIdentDesc);
  60
  61         if (impuse) {
  62                 if (adinicb || (offset + liu < 0)) {
  63                         memcpy((uint8_t *)sfi->impUse, impuse, liu);
  64                 } else if (offset >= 0) {
  65                         memcpy(fibh->ebh->b_data + offset, impuse, liu);
  66                 } else {
  67                         memcpy((uint8_t *)sfi->impUse, impuse, -offset);
  68                         memcpy(fibh->ebh->b_data, impuse - offset,
  69                                 liu + offset);
  70                 }
  71         }
  72
  73         offset += liu;
  74
  75         if (fileident) {
  76                 if (adinicb || (offset + lfi < 0)) {
  77                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
  78                 } else if (offset >= 0) {
  79                         memcpy(fibh->ebh->b_data + offset, fileident, lfi);
  80                 } else {
  81                         memcpy((uint8_t *)sfi->fileIdent + liu, fileident,
  82                                 -offset);
  83                         memcpy(fibh->ebh->b_data, fileident - offset,
  84                                 lfi + offset);
  85                 }
  86         }
  87
  88         offset += lfi;
  89
  90         if (adinicb || (offset + padlen < 0)) {
  91                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
  92         } else if (offset >= 0) {
  93                 memset(fibh->ebh->b_data + offset, 0x00, padlen);
  94         } else {
  95                 memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
  96                 memset(fibh->ebh->b_data, 0x00, padlen + offset);
  97         }
  98
  99         crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(struct tag),
 100                       sizeof(struct fileIdentDesc) - sizeof(struct tag));
 101
 102         if (fibh->sbh == fibh->ebh) {
 103                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 104                               crclen + sizeof(struct tag) -
 105                               sizeof(struct fileIdentDesc));
 106         } else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
 107                 crc = crc_itu_t(crc, fibh->ebh->b_data +
 108                                         sizeof(struct fileIdentDesc) +
 109                                         fibh->soffset,
 110                               crclen + sizeof(struct tag) -
 111                                         sizeof(struct fileIdentDesc));
 112         } else {
 113                 crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 114                               -fibh->soffset - sizeof(struct fileIdentDesc));
 115                 crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 116         }
 117
 118         cfi->descTag.descCRC = cpu_to_le16(crc);
 119         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
 120         cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 121
 122         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
 123                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
 124                         sizeof(struct fileIdentDesc));
 125         } else {
 126                 memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
 127                 memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
 128                        sizeof(struct fileIdentDesc) + fibh->soffset);
 129         }
 130
 131         if (adinicb) {
 132                 mark_inode_dirty(inode);
 133         } else {
 134                 if (fibh->sbh != fibh->ebh)
 135                         mark_buffer_dirty_inode(fibh->ebh, inode);
 136                 mark_buffer_dirty_inode(fibh->sbh, inode);
 137         }
 138         return 0;
 139 }
 140
 141 /**
 142  * udf_find_entry - find entry in given directory.
 143  *
 144  * @dir:        directory inode to search in
 145  * @child:      qstr of the name
 146  * @fibh:       buffer head / inode with file identifier descriptor we found
 147  * @cfi:        found file identifier descriptor with given name
 148  *
 149  * This function searches in the directory @dir for a file name @child. When
 150  * found, @fibh points to the buffer head(s) (bh is NULL for in ICB
 151  * directories) containing the file identifier descriptor (FID). In that case
 152  * the function returns pointer to the FID in the buffer or inode - but note
 153  * that FID may be split among two buffers (blocks) so accessing it via that
 154  * pointer isn't easily possible. This pointer can be used only as an iterator
 155  * for other directory manipulation functions. For inspection of the FID @cfi
 156  * can be used - the found FID is copied there.
 157  *
 158  * Returns pointer to FID, NULL when nothing found, or error code.
 159  */
 160 static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 161                                             const struct qstr *child,
 162                                             struct udf_fileident_bh *fibh,
 163                                             struct fileIdentDesc *cfi)
 164 {
 165         struct fileIdentDesc *fi = NULL;
 166         loff_t f_pos;
 167         udf_pblk_t block;
 168         int flen;
 169         unsigned char *fname = NULL, *copy_name = NULL;
 170         unsigned char *nameptr;
 171         uint8_t lfi;
 172         uint16_t liu;
 173         loff_t size;
 174         struct kernel_lb_addr eloc;
 175         uint32_t elen;
 176         sector_t offset;
 177         struct extent_position epos = {};
 178         struct udf_inode_info *dinfo = UDF_I(dir);
 179         int isdotdot = child->len == 2 &&
 180                 child->name[0] == '.' && child->name[1] == '.';
 181         struct super_block *sb = dir->i_sb;
 182
 183         size = udf_ext0_offset(dir) + dir->i_size;
 184         f_pos = udf_ext0_offset(dir);
 185
 186         fibh->sbh = fibh->ebh = NULL;
 187         fibh->soffset = fibh->eoffset = f_pos & (sb->s_blocksize - 1);
 188         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 189                 if (inode_bmap(dir, f_pos >> sb->s_blocksize_bits, &epos,
 190                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 191                         fi = ERR_PTR(-EIO);
 192                         goto out_err;
 193                 }
 194
 195                 block = udf_get_lb_pblock(sb, &eloc, offset);
 196                 if ((++offset << sb->s_blocksize_bits) < elen) {
 197                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 198                                 epos.offset -= sizeof(struct short_ad);
 199                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 200                                 epos.offset -= sizeof(struct long_ad);
 201                 } else
 202                         offset = 0;
 203
 204                 fibh->sbh = fibh->ebh = udf_tread(sb, block);
 205                 if (!fibh->sbh) {
 206                         fi = ERR_PTR(-EIO);
 207                         goto out_err;
 208                 }
 209         }
 210
 211         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
 212         if (!fname) {
 213                 fi = ERR_PTR(-ENOMEM);
 214                 goto out_err;
 215         }
 216
 217         while (f_pos < size) {
 218                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 219                                         &elen, &offset);
 220                 if (!fi) {
 221                         fi = ERR_PTR(-EIO);
 222                         goto out_err;
 223                 }
 224
 225                 liu = le16_to_cpu(cfi->lengthOfImpUse);
 226                 lfi = cfi->lengthFileIdent;
 227
 228                 if (fibh->sbh == fibh->ebh) {
 229                         nameptr = fi->fileIdent + liu;
 230                 } else {
 231                         int poffset;    /* Unpaded ending offset */
 232
 233                         poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
 234                                         liu + lfi;
 235
 236                         if (poffset >= lfi)
 237                                 nameptr = (uint8_t *)(fibh->ebh->b_data +
 238                                                       poffset - lfi);
 239                         else {
 240                                 if (!copy_name) {
 241                                         copy_name = kmalloc(UDF_NAME_LEN,
 242                                                             GFP_NOFS);
 243                                         if (!copy_name) {
 244                                                 fi = ERR_PTR(-ENOMEM);
 245                                                 goto out_err;
 246                                         }
 247                                 }
 248                                 nameptr = copy_name;
 249                                 memcpy(nameptr, fi->fileIdent + liu,
 250                                         lfi - poffset);
 251                                 memcpy(nameptr + lfi - poffset,
 252                                         fibh->ebh->b_data, poffset);
 253                         }
 254                 }
 255
 256                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 257                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
 258                                 continue;
 259                 }
 260
 261                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
 262                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
 263                                 continue;
 264                 }
 265
 266                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
 267                     isdotdot)
 268                         goto out_ok;
 269
 270                 if (!lfi)
 271                         continue;
 272
 273                 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
 274                 if (flen < 0) {
 275                         fi = ERR_PTR(flen);
 276                         goto out_err;
 277                 }
 278
 279                 if (udf_match(flen, fname, child->len, child->name))
 280                         goto out_ok;
 281         }
 282
 283         fi = NULL;
 284 out_err:
 285         if (fibh->sbh != fibh->ebh)
 286                 brelse(fibh->ebh);
 287         brelse(fibh->sbh);
 288 out_ok:
 289         brelse(epos.bh);
 290         kfree(fname);
 291         kfree(copy_name);
 292
 293         return fi;
 294 }
 295
 296 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 297                                  unsigned int flags)
 298 {
 299         struct inode *inode = NULL;
 300         struct fileIdentDesc cfi;
 301         struct udf_fileident_bh fibh;
 302         struct fileIdentDesc *fi;
 303
 304         if (dentry->d_name.len > UDF_NAME_LEN)
 305                 return ERR_PTR(-ENAMETOOLONG);
 306
 307         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 308         if (IS_ERR(fi))
 309                 return ERR_CAST(fi);
 310
 311         if (fi) {
 312                 struct kernel_lb_addr loc;
 313
 314                 if (fibh.sbh != fibh.ebh)
 315                         brelse(fibh.ebh);
 316                 brelse(fibh.sbh);
 317
 318                 loc = lelb_to_cpu(cfi.icb.extLocation);
 319                 inode = udf_iget(dir->i_sb, &loc);
 320                 if (IS_ERR(inode))
 321                         return ERR_CAST(inode);
 322         }
 323
 324         return d_splice_alias(inode, dentry);
 325 }
 326
 327 static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 328                                            struct dentry *dentry,
 329                                            struct udf_fileident_bh *fibh,
 330                                            struct fileIdentDesc *cfi, int *err)
 331 {
 332         struct super_block *sb = dir->i_sb;
 333         struct fileIdentDesc *fi = NULL;
 334         unsigned char *name = NULL;
 335         int namelen;
 336         loff_t f_pos;
 337         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 338         int nfidlen;
 339         udf_pblk_t block;
 340         struct kernel_lb_addr eloc;
 341         uint32_t elen = 0;
 342         sector_t offset;
 343         struct extent_position epos = {};
 344         struct udf_inode_info *dinfo;
 345
 346         fibh->sbh = fibh->ebh = NULL;
 347         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 348         if (!name) {
 349                 *err = -ENOMEM;
 350                 goto out_err;
 351         }
 352
 353         if (dentry) {
 354                 if (!dentry->d_name.len) {
 355                         *err = -EINVAL;
 356                         goto out_err;
 357                 }
 358                 namelen = udf_put_filename(sb, dentry->d_name.name,
 359                                            dentry->d_name.len,
 360                                            name, UDF_NAME_LEN_CS0);
 361                 if (!namelen) {
 362                         *err = -ENAMETOOLONG;
 363                         goto out_err;
 364                 }
 365         } else {
 366                 namelen = 0;
 367         }
 368
 369         nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 370
 371         f_pos = udf_ext0_offset(dir);
 372
 373         fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 374         dinfo = UDF_I(dir);
 375         if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 376                 if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
 377                     &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
 378                         block = udf_get_lb_pblock(dir->i_sb,
 379                                         &dinfo->i_location, 0);
 380                         fibh->soffset = fibh->eoffset = sb->s_blocksize;
 381                         goto add;
 382                 }
 383                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 384                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 385                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 386                                 epos.offset -= sizeof(struct short_ad);
 387                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 388                                 epos.offset -= sizeof(struct long_ad);
 389                 } else
 390                         offset = 0;
 391
 392                 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 393                 if (!fibh->sbh) {
 394                         *err = -EIO;
 395                         goto out_err;
 396                 }
 397
 398                 block = dinfo->i_location.logicalBlockNum;
 399         }
 400
 401         while (f_pos < size) {
 402                 fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 403                                         &elen, &offset);
 404
 405                 if (!fi) {
 406                         *err = -EIO;
 407                         goto out_err;
 408                 }
 409
 410                 if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 411                         if (udf_dir_entry_len(cfi) == nfidlen) {
 412                                 cfi->descTag.tagSerialNum = cpu_to_le16(1);
 413                                 cfi->fileVersionNum = cpu_to_le16(1);
 414                                 cfi->fileCharacteristics = 0;
 415                                 cfi->lengthFileIdent = namelen;
 416                                 cfi->lengthOfImpUse = cpu_to_le16(0);
 417                                 if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 418                                                   name))
 419                                         goto out_ok;
 420                                 else {
 421                                         *err = -EIO;
 422                                         goto out_err;
 423                                 }
 424                         }
 425                 }
 426         }
 427
 428 add:
 429         f_pos += nfidlen;
 430
 431         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 432             sb->s_blocksize - fibh->eoffset < nfidlen) {
 433                 brelse(epos.bh);
 434                 epos.bh = NULL;
 435                 fibh->soffset -= udf_ext0_offset(dir);
 436                 fibh->eoffset -= udf_ext0_offset(dir);
 437                 f_pos -= udf_ext0_offset(dir);
 438                 if (fibh->sbh != fibh->ebh)
 439                         brelse(fibh->ebh);
 440                 brelse(fibh->sbh);
 441                 fibh->sbh = fibh->ebh =
 442                                 udf_expand_dir_adinicb(dir, &block, err);
 443                 if (!fibh->sbh)
 444                         goto out_err;
 445                 epos.block = dinfo->i_location;
 446                 epos.offset = udf_file_entry_alloc_offset(dir);
 447                 /* Load extent udf_expand_dir_adinicb() has created */
 448                 udf_current_aext(dir, &epos, &eloc, &elen, 1);
 449         }
 450
 451         /* Entry fits into current block? */
 452         if (sb->s_blocksize - fibh->eoffset >= nfidlen) {
 453                 fibh->soffset = fibh->eoffset;
 454                 fibh->eoffset += nfidlen;
 455                 if (fibh->sbh != fibh->ebh) {
 456                         brelse(fibh->sbh);
 457                         fibh->sbh = fibh->ebh;
 458                 }
 459
 460                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 461                         block = dinfo->i_location.logicalBlockNum;
 462                         fi = (struct fileIdentDesc *)
 463                                         (dinfo->i_ext.i_data +
 464                                          fibh->soffset -
 465                                          udf_ext0_offset(dir) +
 466                                          dinfo->i_lenEAttr);
 467                 } else {
 468                         block = eloc.logicalBlockNum +
 469                                         ((elen - 1) >>
 470                                                 dir->i_sb->s_blocksize_bits);
 471                         fi = (struct fileIdentDesc *)
 472                                 (fibh->sbh->b_data + fibh->soffset);
 473                 }
 474         } else {
 475                 /* Round up last extent in the file */
 476                 elen = (elen + sb->s_blocksize - 1) & ~(sb->s_blocksize - 1);
 477                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 478                         epos.offset -= sizeof(struct short_ad);
 479                 else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 480                         epos.offset -= sizeof(struct long_ad);
 481                 udf_write_aext(dir, &epos, &eloc, elen, 1);
 482                 dinfo->i_lenExtents = (dinfo->i_lenExtents + sb->s_blocksize
 483                                         - 1) & ~(sb->s_blocksize - 1);
 484
 485                 fibh->soffset = fibh->eoffset - sb->s_blocksize;
 486                 fibh->eoffset += nfidlen - sb->s_blocksize;
 487                 if (fibh->sbh != fibh->ebh) {
 488                         brelse(fibh->sbh);
 489                         fibh->sbh = fibh->ebh;
 490                 }
 491
 492                 block = eloc.logicalBlockNum + ((elen - 1) >>
 493                                                 dir->i_sb->s_blocksize_bits);
 494                 fibh->ebh = udf_bread(dir,
 495                                 f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
 496                 if (!fibh->ebh)
 497                         goto out_err;
 498                 /* Extents could have been merged, invalidate our position */
 499                 brelse(epos.bh);
 500                 epos.bh = NULL;
 501                 epos.block = dinfo->i_location;
 502                 epos.offset = udf_file_entry_alloc_offset(dir);
 503
 504                 if (!fibh->soffset) {
 505                         /* Find the freshly allocated block */
 506                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 507                                 (EXT_RECORDED_ALLOCATED >> 30))
 508                                 ;
 509                         block = eloc.logicalBlockNum + ((elen - 1) >>
 510                                         dir->i_sb->s_blocksize_bits);
 511                         brelse(fibh->sbh);
 512                         fibh->sbh = fibh->ebh;
 513                         fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
 514                 } else {
 515                         fi = (struct fileIdentDesc *)
 516                                 (fibh->sbh->b_data + sb->s_blocksize +
 517                                         fibh->soffset);
 518                 }
 519         }
 520
 521         memset(cfi, 0, sizeof(struct fileIdentDesc));
 522         if (UDF_SB(sb)->s_udfrev >= 0x0200)
 523                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block,
 524                             sizeof(struct tag));
 525         else
 526                 udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block,
 527                             sizeof(struct tag));
 528         cfi->fileVersionNum = cpu_to_le16(1);
 529         cfi->lengthFileIdent = namelen;
 530         cfi->lengthOfImpUse = cpu_to_le16(0);
 531         if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
 532                 dir->i_size += nfidlen;
 533                 if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 534                         dinfo->i_lenAlloc += nfidlen;
 535                 else {
 536                         /* Find the last extent and truncate it to proper size */
 537                         while (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
 538                                 (EXT_RECORDED_ALLOCATED >> 30))
 539                                 ;
 540                         elen -= dinfo->i_lenExtents - dir->i_size;
 541                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 542                                 epos.offset -= sizeof(struct short_ad);
 543                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 544                                 epos.offset -= sizeof(struct long_ad);
 545                         udf_write_aext(dir, &epos, &eloc, elen, 1);
 546                         dinfo->i_lenExtents = dir->i_size;
 547                 }
 548
 549                 mark_inode_dirty(dir);
 550                 goto out_ok;
 551         } else {
 552                 *err = -EIO;
 553                 goto out_err;
 554         }
 555
 556 out_err:
 557         fi = NULL;
 558         if (fibh->sbh != fibh->ebh)
 559                 brelse(fibh->ebh);
 560         brelse(fibh->sbh);
 561 out_ok:
 562         brelse(epos.bh);
 563         kfree(name);
 564         return fi;
 565 }
 566
 567 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
 568                             struct udf_fileident_bh *fibh,
 569                             struct fileIdentDesc *cfi)
 570 {
 571         cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
 572
 573         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
 574                 memset(&(cfi->icb), 0x00, sizeof(struct long_ad));
 575
 576         return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
 577 }
 578
 579 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 580 {
 581         struct udf_inode_info *iinfo = UDF_I(inode);
 582         struct inode *dir = d_inode(dentry->d_parent);
 583         struct udf_fileident_bh fibh;
 584         struct fileIdentDesc cfi, *fi;
 585         int err;
 586
 587         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 588         if (unlikely(!fi)) {
 589                 inode_dec_link_count(inode);
 590                 discard_new_inode(inode);
 591                 return err;
 592         }
 593         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 594         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 595         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 596                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 597         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 598         dir->i_ctime = dir->i_mtime = current_time(dir);
 599         mark_inode_dirty(dir);
 600         if (fibh.sbh != fibh.ebh)
 601                 brelse(fibh.ebh);
 602         brelse(fibh.sbh);
 603         d_instantiate_new(dentry, inode);
 604
 605         return 0;
 606 }
 607
 608 static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 609                       bool excl)
 610 {
 611         struct inode *inode = udf_new_inode(dir, mode);
 612
 613         if (IS_ERR(inode))
 614                 return PTR_ERR(inode);
 615
 616         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 617                 inode->i_data.a_ops = &udf_adinicb_aops;
 618         else
 619                 inode->i_data.a_ops = &udf_aops;
 620         inode->i_op = &udf_file_inode_operations;
 621         inode->i_fop = &udf_file_operations;
 622         mark_inode_dirty(inode);
 623
 624         return udf_add_nondir(dentry, inode);
 625 }
 626
 627 static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
 628 {
 629         struct inode *inode = udf_new_inode(dir, mode);
 630
 631         if (IS_ERR(inode))
 632                 return PTR_ERR(inode);
 633
 634         if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 635                 inode->i_data.a_ops = &udf_adinicb_aops;
 636         else
 637                 inode->i_data.a_ops = &udf_aops;
 638         inode->i_op = &udf_file_inode_operations;
 639         inode->i_fop = &udf_file_operations;
 640         mark_inode_dirty(inode);
 641         d_tmpfile(dentry, inode);
 642         unlock_new_inode(inode);
 643         return 0;
 644 }
 645
 646 static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 647                      dev_t rdev)
 648 {
 649         struct inode *inode;
 650
 651         if (!old_valid_dev(rdev))
 652                 return -EINVAL;
 653
 654         inode = udf_new_inode(dir, mode);
 655         if (IS_ERR(inode))
 656                 return PTR_ERR(inode);
 657
 658         init_special_inode(inode, mode, rdev);
 659         return udf_add_nondir(dentry, inode);
 660 }
 661
 662 static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 663 {
 664         struct inode *inode;
 665         struct udf_fileident_bh fibh;
 666         struct fileIdentDesc cfi, *fi;
 667         int err;
 668         struct udf_inode_info *dinfo = UDF_I(dir);
 669         struct udf_inode_info *iinfo;
 670
 671         inode = udf_new_inode(dir, S_IFDIR | mode);
 672         if (IS_ERR(inode))
 673                 return PTR_ERR(inode);
 674
 675         iinfo = UDF_I(inode);
 676         inode->i_op = &udf_dir_inode_operations;
 677         inode->i_fop = &udf_dir_operations;
 678         fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err);
 679         if (!fi) {
 680                 inode_dec_link_count(inode);
 681                 discard_new_inode(inode);
 682                 goto out;
 683         }
 684         set_nlink(inode, 2);
 685         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 686         cfi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 687         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 688                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 689         cfi.fileCharacteristics =
 690                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 691         udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
 692         brelse(fibh.sbh);
 693         mark_inode_dirty(inode);
 694
 695         fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
 696         if (!fi) {
 697                 clear_nlink(inode);
 698                 mark_inode_dirty(inode);
 699                 discard_new_inode(inode);
 700                 goto out;
 701         }
 702         cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 703         cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 704         *(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
 705                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 706         cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 707         udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
 708         inc_nlink(dir);
 709         dir->i_ctime = dir->i_mtime = current_time(dir);
 710         mark_inode_dirty(dir);
 711         d_instantiate_new(dentry, inode);
 712         if (fibh.sbh != fibh.ebh)
 713                 brelse(fibh.ebh);
 714         brelse(fibh.sbh);
 715         err = 0;
 716
 717 out:
 718         return err;
 719 }
 720
 721 static int empty_dir(struct inode *dir)
 722 {
 723         struct fileIdentDesc *fi, cfi;
 724         struct udf_fileident_bh fibh;
 725         loff_t f_pos;
 726         loff_t size = udf_ext0_offset(dir) + dir->i_size;
 727         udf_pblk_t block;
 728         struct kernel_lb_addr eloc;
 729         uint32_t elen;
 730         sector_t offset;
 731         struct extent_position epos = {};
 732         struct udf_inode_info *dinfo = UDF_I(dir);
 733
 734         f_pos = udf_ext0_offset(dir);
 735         fibh.soffset = fibh.eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 736
 737         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 738                 fibh.sbh = fibh.ebh = NULL;
 739         else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
 740                               &epos, &eloc, &elen, &offset) ==
 741                                         (EXT_RECORDED_ALLOCATED >> 30)) {
 742                 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
 743                 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 744                         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
 745                                 epos.offset -= sizeof(struct short_ad);
 746                         else if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
 747                                 epos.offset -= sizeof(struct long_ad);
 748                 } else
 749                         offset = 0;
 750
 751                 fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block);
 752                 if (!fibh.sbh) {
 753                         brelse(epos.bh);
 754                         return 0;
 755                 }
 756         } else {
 757                 brelse(epos.bh);
 758                 return 0;
 759         }
 760
 761         while (f_pos < size) {
 762                 fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &epos, &eloc,
 763                                         &elen, &offset);
 764                 if (!fi) {
 765                         if (fibh.sbh != fibh.ebh)
 766                                 brelse(fibh.ebh);
 767                         brelse(fibh.sbh);
 768                         brelse(epos.bh);
 769                         return 0;
 770                 }
 771
 772                 if (cfi.lengthFileIdent &&
 773                     (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0) {
 774                         if (fibh.sbh != fibh.ebh)
 775                                 brelse(fibh.ebh);
 776                         brelse(fibh.sbh);
 777                         brelse(epos.bh);
 778                         return 0;
 779                 }
 780         }
 781
 782         if (fibh.sbh != fibh.ebh)
 783                 brelse(fibh.ebh);
 784         brelse(fibh.sbh);
 785         brelse(epos.bh);
 786
 787         return 1;
 788 }
 789
 790 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 791 {
 792         int retval;
 793         struct inode *inode = d_inode(dentry);
 794         struct udf_fileident_bh fibh;
 795         struct fileIdentDesc *fi, cfi;
 796         struct kernel_lb_addr tloc;
 797
 798         retval = -ENOENT;
 799         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 800         if (IS_ERR_OR_NULL(fi)) {
 801                 if (fi)
 802                         retval = PTR_ERR(fi);
 803                 goto out;
 804         }
 805
 806         retval = -EIO;
 807         tloc = lelb_to_cpu(cfi.icb.extLocation);
 808         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 809                 goto end_rmdir;
 810         retval = -ENOTEMPTY;
 811         if (!empty_dir(inode))
 812                 goto end_rmdir;
 813         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 814         if (retval)
 815                 goto end_rmdir;
 816         if (inode->i_nlink != 2)
 817                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 818                          inode->i_nlink);
 819         clear_nlink(inode);
 820         inode->i_size = 0;
 821         inode_dec_link_count(dir);
 822         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 823                                                 current_time(inode);
 824         mark_inode_dirty(dir);
 825
 826 end_rmdir:
 827         if (fibh.sbh != fibh.ebh)
 828                 brelse(fibh.ebh);
 829         brelse(fibh.sbh);
 830
 831 out:
 832         return retval;
 833 }
 834
 835 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 836 {
 837         int retval;
 838         struct inode *inode = d_inode(dentry);
 839         struct udf_fileident_bh fibh;
 840         struct fileIdentDesc *fi;
 841         struct fileIdentDesc cfi;
 842         struct kernel_lb_addr tloc;
 843
 844         retval = -ENOENT;
 845         fi = udf_find_entry(dir, &dentry->d_name, &fibh, &cfi);
 846
 847         if (IS_ERR_OR_NULL(fi)) {
 848                 if (fi)
 849                         retval = PTR_ERR(fi);
 850                 goto out;
 851         }
 852
 853         retval = -EIO;
 854         tloc = lelb_to_cpu(cfi.icb.extLocation);
 855         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 856                 goto end_unlink;
 857
 858         if (!inode->i_nlink) {
 859                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 860                           inode->i_ino, inode->i_nlink);
 861                 set_nlink(inode, 1);
 862         }
 863         retval = udf_delete_entry(dir, fi, &fibh, &cfi);
 864         if (retval)
 865                 goto end_unlink;
 866         dir->i_ctime = dir->i_mtime = current_time(dir);
 867         mark_inode_dirty(dir);
 868         inode_dec_link_count(inode);
 869         inode->i_ctime = dir->i_ctime;
 870         retval = 0;
 871
 872 end_unlink:
 873         if (fibh.sbh != fibh.ebh)
 874                 brelse(fibh.ebh);
 875         brelse(fibh.sbh);
 876
 877 out:
 878         return retval;
 879 }
 880
 881 static int udf_symlink(struct inode *dir, struct dentry *dentry,
 882                        const char *symname)
 883 {
 884         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 885         struct pathComponent *pc;
 886         const char *compstart;
 887         struct extent_position epos = {};
 888         int eoffset, elen = 0;
 889         uint8_t *ea;
 890         int err;
 891         udf_pblk_t block;
 892         unsigned char *name = NULL;
 893         int namelen;
 894         struct udf_inode_info *iinfo;
 895         struct super_block *sb = dir->i_sb;
 896
 897         if (IS_ERR(inode))
 898                 return PTR_ERR(inode);
 899
 900         iinfo = UDF_I(inode);
 901         down_write(&iinfo->i_data_sem);
 902         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 903         if (!name) {
 904                 err = -ENOMEM;
 905                 goto out_no_entry;
 906         }
 907
 908         inode->i_data.a_ops = &udf_symlink_aops;
 909         inode->i_op = &udf_symlink_inode_operations;
 910         inode_nohighmem(inode);
 911
 912         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 913                 struct kernel_lb_addr eloc;
 914                 uint32_t bsize;
 915
 916                 block = udf_new_block(sb, inode,
 917                                 iinfo->i_location.partitionReferenceNum,
 918                                 iinfo->i_location.logicalBlockNum, &err);
 919                 if (!block)
 920                         goto out_no_entry;
 921                 epos.block = iinfo->i_location;
 922                 epos.offset = udf_file_entry_alloc_offset(inode);
 923                 epos.bh = NULL;
 924                 eloc.logicalBlockNum = block;
 925                 eloc.partitionReferenceNum =
 926                                 iinfo->i_location.partitionReferenceNum;
 927                 bsize = sb->s_blocksize;
 928                 iinfo->i_lenExtents = bsize;
 929                 udf_add_aext(inode, &epos, &eloc, bsize, 0);
 930                 brelse(epos.bh);
 931
 932                 block = udf_get_pblock(sb, block,
 933                                 iinfo->i_location.partitionReferenceNum,
 934                                 0);
 935                 epos.bh = udf_tgetblk(sb, block);
 936                 lock_buffer(epos.bh);
 937                 memset(epos.bh->b_data, 0x00, bsize);
 938                 set_buffer_uptodate(epos.bh);
 939                 unlock_buffer(epos.bh);
 940                 mark_buffer_dirty_inode(epos.bh, inode);
 941                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 942         } else
 943                 ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
 944
 945         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 946         pc = (struct pathComponent *)ea;
 947
 948         if (*symname == '/') {
 949                 do {
 950                         symname++;
 951                 } while (*symname == '/');
 952
 953                 pc->componentType = 1;
 954                 pc->lengthComponentIdent = 0;
 955                 pc->componentFileVersionNum = 0;
 956                 elen += sizeof(struct pathComponent);
 957         }
 958
 959         err = -ENAMETOOLONG;
 960
 961         while (*symname) {
 962                 if (elen + sizeof(struct pathComponent) > eoffset)
 963                         goto out_no_entry;
 964
 965                 pc = (struct pathComponent *)(ea + elen);
 966
 967                 compstart = symname;
 968
 969                 do {
 970                         symname++;
 971                 } while (*symname && *symname != '/');
 972
 973                 pc->componentType = 5;
 974                 pc->lengthComponentIdent = 0;
 975                 pc->componentFileVersionNum = 0;
 976                 if (compstart[0] == '.') {
 977                         if ((symname - compstart) == 1)
 978                                 pc->componentType = 4;
 979                         else if ((symname - compstart) == 2 &&
 980                                         compstart[1] == '.')
 981                                 pc->componentType = 3;
 982                 }
 983
 984                 if (pc->componentType == 5) {
 985                         namelen = udf_put_filename(sb, compstart,
 986                                                    symname - compstart,
 987                                                    name, UDF_NAME_LEN_CS0);
 988                         if (!namelen)
 989                                 goto out_no_entry;
 990
 991                         if (elen + sizeof(struct pathComponent) + namelen >
 992                                         eoffset)
 993                                 goto out_no_entry;
 994                         else
 995                                 pc->lengthComponentIdent = namelen;
 996
 997                         memcpy(pc->componentIdent, name, namelen);
 998                 }
 999
1000                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
1001
1002                 if (*symname) {
1003                         do {
1004                                 symname++;
1005                         } while (*symname == '/');
1006                 }
1007         }
1008
1009         brelse(epos.bh);
1010         inode->i_size = elen;
1011         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1012                 iinfo->i_lenAlloc = inode->i_size;
1013         else
1014                 udf_truncate_tail_extent(inode);
1015         mark_inode_dirty(inode);
1016         up_write(&iinfo->i_data_sem);
1017
1018         err = udf_add_nondir(dentry, inode);
1019 out:
1020         kfree(name);
1021         return err;
1022
1023 out_no_entry:
1024         up_write(&iinfo->i_data_sem);
1025         inode_dec_link_count(inode);
1026         discard_new_inode(inode);
1027         goto out;
1028 }
1029
1030 static int udf_link(struct dentry *old_dentry, struct inode *dir,
1031                     struct dentry *dentry)
1032 {
1033         struct inode *inode = d_inode(old_dentry);
1034         struct udf_fileident_bh fibh;
1035         struct fileIdentDesc cfi, *fi;
1036         int err;
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_time(inode);
1057         mark_inode_dirty(inode);
1058         dir->i_ctime = dir->i_mtime = current_time(dir);
1059         mark_inode_dirty(dir);
1060         ihold(inode);
1061         d_instantiate(dentry, inode);
1062
1063         return 0;
1064 }
1065
1066 /* Anybody can rename anything with this: the permission checks are left to the
1067  * higher-level routines.
1068  */
1069 static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
1070                       struct inode *new_dir, struct dentry *new_dentry,
1071                       unsigned int flags)
1072 {
1073         struct inode *old_inode = d_inode(old_dentry);
1074         struct inode *new_inode = d_inode(new_dentry);
1075         struct udf_fileident_bh ofibh, nfibh;
1076         struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL;
1077         struct fileIdentDesc ocfi, ncfi;
1078         struct buffer_head *dir_bh = NULL;
1079         int retval = -ENOENT;
1080         struct kernel_lb_addr tloc;
1081         struct udf_inode_info *old_iinfo = UDF_I(old_inode);
1082
1083         if (flags & ~RENAME_NOREPLACE)
1084                 return -EINVAL;
1085
1086         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1087         if (IS_ERR(ofi)) {
1088                 retval = PTR_ERR(ofi);
1089                 goto end_rename;
1090         }
1091
1092         if (ofibh.sbh != ofibh.ebh)
1093                 brelse(ofibh.ebh);
1094
1095         brelse(ofibh.sbh);
1096         tloc = lelb_to_cpu(ocfi.icb.extLocation);
1097         if (!ofi || udf_get_lb_pblock(old_dir->i_sb, &tloc, 0)
1098             != old_inode->i_ino)
1099                 goto end_rename;
1100
1101         nfi = udf_find_entry(new_dir, &new_dentry->d_name, &nfibh, &ncfi);
1102         if (IS_ERR(nfi)) {
1103                 retval = PTR_ERR(nfi);
1104                 goto end_rename;
1105         }
1106         if (nfi && !new_inode) {
1107                 if (nfibh.sbh != nfibh.ebh)
1108                         brelse(nfibh.ebh);
1109                 brelse(nfibh.sbh);
1110                 nfi = NULL;
1111         }
1112         if (S_ISDIR(old_inode->i_mode)) {
1113                 int offset = udf_ext0_offset(old_inode);
1114
1115                 if (new_inode) {
1116                         retval = -ENOTEMPTY;
1117                         if (!empty_dir(new_inode))
1118                                 goto end_rename;
1119                 }
1120                 retval = -EIO;
1121                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
1122                         dir_fi = udf_get_fileident(
1123                                         old_iinfo->i_ext.i_data -
1124                                           (old_iinfo->i_efe ?
1125                                            sizeof(struct extendedFileEntry) :
1126                                            sizeof(struct fileEntry)),
1127                                         old_inode->i_sb->s_blocksize, &offset);
1128                 } else {
1129                         dir_bh = udf_bread(old_inode, 0, 0, &retval);
1130                         if (!dir_bh)
1131                                 goto end_rename;
1132                         dir_fi = udf_get_fileident(dir_bh->b_data,
1133                                         old_inode->i_sb->s_blocksize, &offset);
1134                 }
1135                 if (!dir_fi)
1136                         goto end_rename;
1137                 tloc = lelb_to_cpu(dir_fi->icb.extLocation);
1138                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
1139                                 old_dir->i_ino)
1140                         goto end_rename;
1141         }
1142         if (!nfi) {
1143                 nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,
1144                                     &retval);
1145                 if (!nfi)
1146                         goto end_rename;
1147         }
1148
1149         /*
1150          * Like most other Unix systems, set the ctime for inodes on a
1151          * rename.
1152          */
1153         old_inode->i_ctime = current_time(old_inode);
1154         mark_inode_dirty(old_inode);
1155
1156         /*
1157          * ok, that's it
1158          */
1159         ncfi.fileVersionNum = ocfi.fileVersionNum;
1160         ncfi.fileCharacteristics = ocfi.fileCharacteristics;
1161         memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(ocfi.icb));
1162         udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
1163
1164         /* The old fid may have moved - find it again */
1165         ofi = udf_find_entry(old_dir, &old_dentry->d_name, &ofibh, &ocfi);
1166         udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
1167
1168         if (new_inode) {
1169                 new_inode->i_ctime = current_time(new_inode);
1170                 inode_dec_link_count(new_inode);
1171         }
1172         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1173         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1174         mark_inode_dirty(old_dir);
1175         mark_inode_dirty(new_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, udf_dir_entry_len(dir_fi));
1180                 if (old_iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
1181                         mark_inode_dirty(old_inode);
1182                 else
1183                         mark_buffer_dirty_inode(dir_bh, old_inode);
1184
1185                 inode_dec_link_count(old_dir);
1186                 if (new_inode)
1187                         inode_dec_link_count(new_inode);
1188                 else {
1189                         inc_nlink(new_dir);
1190                         mark_inode_dirty(new_dir);
1191                 }
1192         }
1193
1194         if (ofi) {
1195                 if (ofibh.sbh != ofibh.ebh)
1196                         brelse(ofibh.ebh);
1197                 brelse(ofibh.sbh);
1198         }
1199
1200         retval = 0;
1201
1202 end_rename:
1203         brelse(dir_bh);
1204         if (nfi) {
1205                 if (nfibh.sbh != nfibh.ebh)
1206                         brelse(nfibh.ebh);
1207                 brelse(nfibh.sbh);
1208         }
1209
1210         return retval;
1211 }
1212
1213 static struct dentry *udf_get_parent(struct dentry *child)
1214 {
1215         struct kernel_lb_addr tloc;
1216         struct inode *inode = NULL;
1217         struct qstr dotdot = QSTR_INIT("..", 2);
1218         struct fileIdentDesc cfi;
1219         struct udf_fileident_bh fibh;
1220
1221         if (!udf_find_entry(d_inode(child), &dotdot, &fibh, &cfi))
1222                 return ERR_PTR(-EACCES);
1223
1224         if (fibh.sbh != fibh.ebh)
1225                 brelse(fibh.ebh);
1226         brelse(fibh.sbh);
1227
1228         tloc = lelb_to_cpu(cfi.icb.extLocation);
1229         inode = udf_iget(child->d_sb, &tloc);
1230         if (IS_ERR(inode))
1231                 return ERR_CAST(inode);
1232
1233         return d_obtain_alias(inode);
1234 }
1235
1236
1237 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
1238                                         u16 partref, __u32 generation)
1239 {
1240         struct inode *inode;
1241         struct kernel_lb_addr loc;
1242
1243         if (block == 0)
1244                 return ERR_PTR(-ESTALE);
1245
1246         loc.logicalBlockNum = block;
1247         loc.partitionReferenceNum = partref;
1248         inode = udf_iget(sb, &loc);
1249
1250         if (IS_ERR(inode))
1251                 return ERR_CAST(inode);
1252
1253         if (generation && inode->i_generation != generation) {
1254                 iput(inode);
1255                 return ERR_PTR(-ESTALE);
1256         }
1257         return d_obtain_alias(inode);
1258 }
1259
1260 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
1261                                        struct fid *fid, int fh_len, int fh_type)
1262 {
1263         if (fh_len < 3 ||
1264             (fh_type != FILEID_UDF_WITH_PARENT &&
1265              fh_type != FILEID_UDF_WITHOUT_PARENT))
1266                 return NULL;
1267
1268         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
1269                         fid->udf.generation);
1270 }
1271
1272 static struct dentry *udf_fh_to_parent(struct super_block *sb,
1273                                        struct fid *fid, int fh_len, int fh_type)
1274 {
1275         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
1276                 return NULL;
1277
1278         return udf_nfs_get_inode(sb, fid->udf.parent_block,
1279                                  fid->udf.parent_partref,
1280                                  fid->udf.parent_generation);
1281 }
1282 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
1283                          struct inode *parent)
1284 {
1285         int len = *lenp;
1286         struct kernel_lb_addr location = UDF_I(inode)->i_location;
1287         struct fid *fid = (struct fid *)fh;
1288         int type = FILEID_UDF_WITHOUT_PARENT;
1289
1290         if (parent && (len < 5)) {
1291                 *lenp = 5;
1292                 return FILEID_INVALID;
1293         } else if (len < 3) {
1294                 *lenp = 3;
1295                 return FILEID_INVALID;
1296         }
1297
1298         *lenp = 3;
1299         fid->udf.block = location.logicalBlockNum;
1300         fid->udf.partref = location.partitionReferenceNum;
1301         fid->udf.parent_partref = 0;
1302         fid->udf.generation = inode->i_generation;
1303
1304         if (parent) {
1305                 location = UDF_I(parent)->i_location;
1306                 fid->udf.parent_block = location.logicalBlockNum;
1307                 fid->udf.parent_partref = location.partitionReferenceNum;
1308                 fid->udf.parent_generation = inode->i_generation;
1309                 *lenp = 5;
1310                 type = FILEID_UDF_WITH_PARENT;
1311         }
1312
1313         return type;
1314 }
1315
1316 const struct export_operations udf_export_ops = {
1317         .encode_fh      = udf_encode_fh,
1318         .fh_to_dentry   = udf_fh_to_dentry,
1319         .fh_to_parent   = udf_fh_to_parent,
1320         .get_parent     = udf_get_parent,
1321 };
1322
1323 const struct inode_operations udf_dir_inode_operations = {
1324         .lookup                         = udf_lookup,
1325         .create                         = udf_create,
1326         .link                           = udf_link,
1327         .unlink                         = udf_unlink,
1328         .symlink                        = udf_symlink,
1329         .mkdir                          = udf_mkdir,
1330         .rmdir                          = udf_rmdir,
1331         .mknod                          = udf_mknod,
1332         .rename                         = udf_rename,
1333         .tmpfile                        = udf_tmpfile,
1334 };