fs/udf/namei.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * namei.c
   4  *
   5  * PURPOSE
   6  *      Inode name handling routines for the OSTA-UDF(tm) filesystem.
   7  *
   8  * COPYRIGHT
   9  *  (C) 1998-2004 Ben Fennema
  10  *  (C) 1999-2000 Stelias Computing Inc
  11  *
  12  * HISTORY
  13  *
  14  *  12/12/98 blf  Created. Split out the lookup code from dir.c
  15  *  04/19/99 blf  link, mknod, symlink support
  16  */
  17
  18 #include "udfdecl.h"
  19
  20 #include "udf_i.h"
  21 #include "udf_sb.h"
  22 #include <linux/string.h>
  23 #include <linux/errno.h>
  24 #include <linux/mm.h>
  25 #include <linux/slab.h>
  26 #include <linux/sched.h>
  27 #include <linux/crc-itu-t.h>
  28 #include <linux/exportfs.h>
  29 #include <linux/iversion.h>
  30
  31 static inline int udf_match(int len1, const unsigned char *name1, int len2,
  32                             const unsigned char *name2)
  33 {
  34         if (len1 != len2)
  35                 return 0;
  36
  37         return !memcmp(name1, name2, len1);
  38 }
  39
  40 /**
  41  * udf_fiiter_find_entry - find entry in given directory.
  42  *
  43  * @dir:        directory inode to search in
  44  * @child:      qstr of the name
  45  * @iter:       iter to use for searching
  46  *
  47  * This function searches in the directory @dir for a file name @child. When
  48  * found, @iter points to the position in the directory with given entry.
  49  *
  50  * Returns 0 on success, < 0 on error (including -ENOENT).
  51  */
  52 static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child,
  53                                  struct udf_fileident_iter *iter)
  54 {
  55         int flen;
  56         unsigned char *fname = NULL;
  57         struct super_block *sb = dir->i_sb;
  58         int isdotdot = child->len == 2 &&
  59                 child->name[0] == '.' && child->name[1] == '.';
  60         int ret;
  61
  62         fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
  63         if (!fname)
  64                 return -ENOMEM;
  65
  66         for (ret = udf_fiiter_init(iter, dir, 0);
  67              !ret && iter->pos < dir->i_size;
  68              ret = udf_fiiter_advance(iter)) {
  69                 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
  70                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
  71                                 continue;
  72                 }
  73
  74                 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
  75                         if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
  76                                 continue;
  77                 }
  78
  79                 if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) &&
  80                     isdotdot)
  81                         goto out_ok;
  82
  83                 if (!iter->fi.lengthFileIdent)
  84                         continue;
  85
  86                 flen = udf_get_filename(sb, iter->name,
  87                                 iter->fi.lengthFileIdent, fname, UDF_NAME_LEN);
  88                 if (flen < 0) {
  89                         ret = flen;
  90                         goto out_err;
  91                 }
  92
  93                 if (udf_match(flen, fname, child->len, child->name))
  94                         goto out_ok;
  95         }
  96         if (!ret)
  97                 ret = -ENOENT;
  98
  99 out_err:
 100         udf_fiiter_release(iter);
 101 out_ok:
 102         kfree(fname);
 103
 104         return ret;
 105 }
 106
 107 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 108                                  unsigned int flags)
 109 {
 110         struct inode *inode = NULL;
 111         struct udf_fileident_iter iter;
 112         int err;
 113
 114         if (dentry->d_name.len > UDF_NAME_LEN)
 115                 return ERR_PTR(-ENAMETOOLONG);
 116
 117         err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
 118         if (err < 0 && err != -ENOENT)
 119                 return ERR_PTR(err);
 120
 121         if (err == 0) {
 122                 struct kernel_lb_addr loc;
 123
 124                 loc = lelb_to_cpu(iter.fi.icb.extLocation);
 125                 udf_fiiter_release(&iter);
 126
 127                 inode = udf_iget(dir->i_sb, &loc);
 128                 if (IS_ERR(inode))
 129                         return ERR_CAST(inode);
 130         }
 131
 132         return d_splice_alias(inode, dentry);
 133 }
 134
 135 static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block)
 136 {
 137         udf_pblk_t newblock;
 138         struct buffer_head *dbh = NULL;
 139         struct kernel_lb_addr eloc;
 140         struct extent_position epos;
 141         uint8_t alloctype;
 142         struct udf_inode_info *iinfo = UDF_I(inode);
 143         struct udf_fileident_iter iter;
 144         uint8_t *impuse;
 145         int ret;
 146
 147         if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
 148                 alloctype = ICBTAG_FLAG_AD_SHORT;
 149         else
 150                 alloctype = ICBTAG_FLAG_AD_LONG;
 151
 152         if (!inode->i_size) {
 153                 iinfo->i_alloc_type = alloctype;
 154                 mark_inode_dirty(inode);
 155                 return 0;
 156         }
 157
 158         /* alloc block, and copy data to it */
 159         *block = udf_new_block(inode->i_sb, inode,
 160                                iinfo->i_location.partitionReferenceNum,
 161                                iinfo->i_location.logicalBlockNum, &ret);
 162         if (!(*block))
 163                 return ret;
 164         newblock = udf_get_pblock(inode->i_sb, *block,
 165                                   iinfo->i_location.partitionReferenceNum,
 166                                 0);
 167         if (newblock == 0xffffffff)
 168                 return -EFSCORRUPTED;
 169         dbh = sb_getblk(inode->i_sb, newblock);
 170         if (!dbh)
 171                 return -ENOMEM;
 172         lock_buffer(dbh);
 173         memcpy(dbh->b_data, iinfo->i_data, inode->i_size);
 174         memset(dbh->b_data + inode->i_size, 0,
 175                inode->i_sb->s_blocksize - inode->i_size);
 176         set_buffer_uptodate(dbh);
 177         unlock_buffer(dbh);
 178
 179         /* Drop inline data, add block instead */
 180         iinfo->i_alloc_type = alloctype;
 181         memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
 182         iinfo->i_lenAlloc = 0;
 183         eloc.logicalBlockNum = *block;
 184         eloc.partitionReferenceNum =
 185                                 iinfo->i_location.partitionReferenceNum;
 186         iinfo->i_lenExtents = inode->i_size;
 187         epos.bh = NULL;
 188         epos.block = iinfo->i_location;
 189         epos.offset = udf_file_entry_alloc_offset(inode);
 190         ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
 191         brelse(epos.bh);
 192         if (ret < 0) {
 193                 brelse(dbh);
 194                 udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1);
 195                 return ret;
 196         }
 197         mark_inode_dirty(inode);
 198
 199         /* Now fixup tags in moved directory entries */
 200         for (ret = udf_fiiter_init(&iter, inode, 0);
 201              !ret && iter.pos < inode->i_size;
 202              ret = udf_fiiter_advance(&iter)) {
 203                 iter.fi.descTag.tagLocation = cpu_to_le32(*block);
 204                 if (iter.fi.lengthOfImpUse != cpu_to_le16(0))
 205                         impuse = dbh->b_data + iter.pos +
 206                                                 sizeof(struct fileIdentDesc);
 207                 else
 208                         impuse = NULL;
 209                 udf_fiiter_write_fi(&iter, impuse);
 210         }
 211         brelse(dbh);
 212         /*
 213          * We don't expect the iteration to fail as the directory has been
 214          * already verified to be correct
 215          */
 216         WARN_ON_ONCE(ret);
 217         udf_fiiter_release(&iter);
 218
 219         return 0;
 220 }
 221
 222 static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
 223                                 struct udf_fileident_iter *iter)
 224 {
 225         struct udf_inode_info *dinfo = UDF_I(dir);
 226         int nfidlen, namelen = 0;
 227         int ret;
 228         int off, blksize = 1 << dir->i_blkbits;
 229         udf_pblk_t block;
 230         char name[UDF_NAME_LEN_CS0];
 231
 232         if (dentry) {
 233                 if (!dentry->d_name.len)
 234                         return -EINVAL;
 235                 namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
 236                                            dentry->d_name.len,
 237                                            name, UDF_NAME_LEN_CS0);
 238                 if (!namelen)
 239                         return -ENAMETOOLONG;
 240         }
 241         nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
 242
 243         for (ret = udf_fiiter_init(iter, dir, 0);
 244              !ret && iter->pos < dir->i_size;
 245              ret = udf_fiiter_advance(iter)) {
 246                 if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
 247                         if (udf_dir_entry_len(&iter->fi) == nfidlen) {
 248                                 iter->fi.descTag.tagSerialNum = cpu_to_le16(1);
 249                                 iter->fi.fileVersionNum = cpu_to_le16(1);
 250                                 iter->fi.fileCharacteristics = 0;
 251                                 iter->fi.lengthFileIdent = namelen;
 252                                 iter->fi.lengthOfImpUse = cpu_to_le16(0);
 253                                 memcpy(iter->namebuf, name, namelen);
 254                                 iter->name = iter->namebuf;
 255                                 return 0;
 256                         }
 257                 }
 258         }
 259         if (ret) {
 260                 udf_fiiter_release(iter);
 261                 return ret;
 262         }
 263         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
 264             blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) {
 265                 udf_fiiter_release(iter);
 266                 ret = udf_expand_dir_adinicb(dir, &block);
 267                 if (ret)
 268                         return ret;
 269                 ret = udf_fiiter_init(iter, dir, dir->i_size);
 270                 if (ret < 0)
 271                         return ret;
 272         }
 273
 274         /* Get blocknumber to use for entry tag */
 275         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 276                 block = dinfo->i_location.logicalBlockNum;
 277         } else {
 278                 block = iter->eloc.logicalBlockNum +
 279                                 ((iter->elen - 1) >> dir->i_blkbits);
 280         }
 281         off = iter->pos & (blksize - 1);
 282         if (!off)
 283                 off = blksize;
 284         /* Entry fits into current block? */
 285         if (blksize - udf_ext0_offset(dir) - off >= nfidlen)
 286                 goto store_fi;
 287
 288         ret = udf_fiiter_append_blk(iter);
 289         if (ret) {
 290                 udf_fiiter_release(iter);
 291                 return ret;
 292         }
 293
 294         /* Entry will be completely in the new block? Update tag location... */
 295         if (!(iter->pos & (blksize - 1)))
 296                 block = iter->eloc.logicalBlockNum +
 297                                 ((iter->elen - 1) >> dir->i_blkbits);
 298 store_fi:
 299         memset(&iter->fi, 0, sizeof(struct fileIdentDesc));
 300         if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200)
 301                 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block,
 302                             sizeof(struct tag));
 303         else
 304                 udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block,
 305                             sizeof(struct tag));
 306         iter->fi.fileVersionNum = cpu_to_le16(1);
 307         iter->fi.lengthFileIdent = namelen;
 308         iter->fi.lengthOfImpUse = cpu_to_le16(0);
 309         memcpy(iter->namebuf, name, namelen);
 310         iter->name = iter->namebuf;
 311
 312         dir->i_size += nfidlen;
 313         if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
 314                 dinfo->i_lenAlloc += nfidlen;
 315         } else {
 316                 /* Truncate last extent to proper size */
 317                 udf_fiiter_update_elen(iter, iter->elen -
 318                                         (dinfo->i_lenExtents - dir->i_size));
 319         }
 320         mark_inode_dirty(dir);
 321
 322         return 0;
 323 }
 324
 325 static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter)
 326 {
 327         iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED;
 328
 329         if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT))
 330                 memset(&iter->fi.icb, 0x00, sizeof(struct long_ad));
 331
 332         udf_fiiter_write_fi(iter, NULL);
 333 }
 334
 335 static void udf_add_fid_counter(struct super_block *sb, bool dir, int val)
 336 {
 337         struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
 338
 339         if (!lvidiu)
 340                 return;
 341         mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
 342         if (dir)
 343                 le32_add_cpu(&lvidiu->numDirs, val);
 344         else
 345                 le32_add_cpu(&lvidiu->numFiles, val);
 346         udf_updated_lvid(sb);
 347         mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
 348 }
 349
 350 static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
 351 {
 352         struct udf_inode_info *iinfo = UDF_I(inode);
 353         struct inode *dir = d_inode(dentry->d_parent);
 354         struct udf_fileident_iter iter;
 355         int err;
 356
 357         err = udf_fiiter_add_entry(dir, dentry, &iter);
 358         if (err) {
 359                 inode_dec_link_count(inode);
 360                 discard_new_inode(inode);
 361                 return err;
 362         }
 363         iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 364         iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 365         *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
 366                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 367         udf_fiiter_write_fi(&iter, NULL);
 368         dir->i_ctime = dir->i_mtime = current_time(dir);
 369         mark_inode_dirty(dir);
 370         udf_fiiter_release(&iter);
 371         udf_add_fid_counter(dir->i_sb, false, 1);
 372         d_instantiate_new(dentry, inode);
 373
 374         return 0;
 375 }
 376
 377 static int udf_create(struct mnt_idmap *idmap, struct inode *dir,
 378                       struct dentry *dentry, umode_t mode, bool excl)
 379 {
 380         struct inode *inode = udf_new_inode(dir, mode);
 381
 382         if (IS_ERR(inode))
 383                 return PTR_ERR(inode);
 384
 385         inode->i_data.a_ops = &udf_aops;
 386         inode->i_op = &udf_file_inode_operations;
 387         inode->i_fop = &udf_file_operations;
 388         mark_inode_dirty(inode);
 389
 390         return udf_add_nondir(dentry, inode);
 391 }
 392
 393 static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
 394                        struct file *file, umode_t mode)
 395 {
 396         struct inode *inode = udf_new_inode(dir, mode);
 397
 398         if (IS_ERR(inode))
 399                 return PTR_ERR(inode);
 400
 401         inode->i_data.a_ops = &udf_aops;
 402         inode->i_op = &udf_file_inode_operations;
 403         inode->i_fop = &udf_file_operations;
 404         mark_inode_dirty(inode);
 405         d_tmpfile(file, inode);
 406         unlock_new_inode(inode);
 407         return finish_open_simple(file, 0);
 408 }
 409
 410 static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir,
 411                      struct dentry *dentry, umode_t mode, dev_t rdev)
 412 {
 413         struct inode *inode;
 414
 415         if (!old_valid_dev(rdev))
 416                 return -EINVAL;
 417
 418         inode = udf_new_inode(dir, mode);
 419         if (IS_ERR(inode))
 420                 return PTR_ERR(inode);
 421
 422         init_special_inode(inode, mode, rdev);
 423         return udf_add_nondir(dentry, inode);
 424 }
 425
 426 static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 427                      struct dentry *dentry, umode_t mode)
 428 {
 429         struct inode *inode;
 430         struct udf_fileident_iter iter;
 431         int err;
 432         struct udf_inode_info *dinfo = UDF_I(dir);
 433         struct udf_inode_info *iinfo;
 434
 435         inode = udf_new_inode(dir, S_IFDIR | mode);
 436         if (IS_ERR(inode))
 437                 return PTR_ERR(inode);
 438
 439         iinfo = UDF_I(inode);
 440         inode->i_op = &udf_dir_inode_operations;
 441         inode->i_fop = &udf_dir_operations;
 442         err = udf_fiiter_add_entry(inode, NULL, &iter);
 443         if (err) {
 444                 clear_nlink(inode);
 445                 discard_new_inode(inode);
 446                 return err;
 447         }
 448         set_nlink(inode, 2);
 449         iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 450         iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
 451         *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
 452                 cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
 453         iter.fi.fileCharacteristics =
 454                         FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
 455         udf_fiiter_write_fi(&iter, NULL);
 456         udf_fiiter_release(&iter);
 457         mark_inode_dirty(inode);
 458
 459         err = udf_fiiter_add_entry(dir, dentry, &iter);
 460         if (err) {
 461                 clear_nlink(inode);
 462                 discard_new_inode(inode);
 463                 return err;
 464         }
 465         iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 466         iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
 467         *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
 468                 cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
 469         iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
 470         udf_fiiter_write_fi(&iter, NULL);
 471         udf_fiiter_release(&iter);
 472         udf_add_fid_counter(dir->i_sb, true, 1);
 473         inc_nlink(dir);
 474         dir->i_ctime = dir->i_mtime = current_time(dir);
 475         mark_inode_dirty(dir);
 476         d_instantiate_new(dentry, inode);
 477
 478         return 0;
 479 }
 480
 481 static int empty_dir(struct inode *dir)
 482 {
 483         struct udf_fileident_iter iter;
 484         int ret;
 485
 486         for (ret = udf_fiiter_init(&iter, dir, 0);
 487              !ret && iter.pos < dir->i_size;
 488              ret = udf_fiiter_advance(&iter)) {
 489                 if (iter.fi.lengthFileIdent &&
 490                     !(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) {
 491                         udf_fiiter_release(&iter);
 492                         return 0;
 493                 }
 494         }
 495         udf_fiiter_release(&iter);
 496
 497         return 1;
 498 }
 499
 500 static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 501 {
 502         int ret;
 503         struct inode *inode = d_inode(dentry);
 504         struct udf_fileident_iter iter;
 505         struct kernel_lb_addr tloc;
 506
 507         ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
 508         if (ret)
 509                 goto out;
 510
 511         ret = -EFSCORRUPTED;
 512         tloc = lelb_to_cpu(iter.fi.icb.extLocation);
 513         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 514                 goto end_rmdir;
 515         ret = -ENOTEMPTY;
 516         if (!empty_dir(inode))
 517                 goto end_rmdir;
 518         udf_fiiter_delete_entry(&iter);
 519         if (inode->i_nlink != 2)
 520                 udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
 521                          inode->i_nlink);
 522         clear_nlink(inode);
 523         inode->i_size = 0;
 524         inode_dec_link_count(dir);
 525         udf_add_fid_counter(dir->i_sb, true, -1);
 526         inode->i_ctime = dir->i_ctime = dir->i_mtime =
 527                                                 current_time(inode);
 528         mark_inode_dirty(dir);
 529         ret = 0;
 530 end_rmdir:
 531         udf_fiiter_release(&iter);
 532 out:
 533         return ret;
 534 }
 535
 536 static int udf_unlink(struct inode *dir, struct dentry *dentry)
 537 {
 538         int ret;
 539         struct inode *inode = d_inode(dentry);
 540         struct udf_fileident_iter iter;
 541         struct kernel_lb_addr tloc;
 542
 543         ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
 544         if (ret)
 545                 goto out;
 546
 547         ret = -EFSCORRUPTED;
 548         tloc = lelb_to_cpu(iter.fi.icb.extLocation);
 549         if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
 550                 goto end_unlink;
 551
 552         if (!inode->i_nlink) {
 553                 udf_debug("Deleting nonexistent file (%lu), %u\n",
 554                           inode->i_ino, inode->i_nlink);
 555                 set_nlink(inode, 1);
 556         }
 557         udf_fiiter_delete_entry(&iter);
 558         dir->i_ctime = dir->i_mtime = current_time(dir);
 559         mark_inode_dirty(dir);
 560         inode_dec_link_count(inode);
 561         udf_add_fid_counter(dir->i_sb, false, -1);
 562         inode->i_ctime = dir->i_ctime;
 563         ret = 0;
 564 end_unlink:
 565         udf_fiiter_release(&iter);
 566 out:
 567         return ret;
 568 }
 569
 570 static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
 571                        struct dentry *dentry, const char *symname)
 572 {
 573         struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
 574         struct pathComponent *pc;
 575         const char *compstart;
 576         struct extent_position epos = {};
 577         int eoffset, elen = 0;
 578         uint8_t *ea;
 579         int err;
 580         udf_pblk_t block;
 581         unsigned char *name = NULL;
 582         int namelen;
 583         struct udf_inode_info *iinfo;
 584         struct super_block *sb = dir->i_sb;
 585
 586         if (IS_ERR(inode))
 587                 return PTR_ERR(inode);
 588
 589         iinfo = UDF_I(inode);
 590         down_write(&iinfo->i_data_sem);
 591         name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
 592         if (!name) {
 593                 err = -ENOMEM;
 594                 goto out_no_entry;
 595         }
 596
 597         inode->i_data.a_ops = &udf_symlink_aops;
 598         inode->i_op = &udf_symlink_inode_operations;
 599         inode_nohighmem(inode);
 600
 601         if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
 602                 struct kernel_lb_addr eloc;
 603                 uint32_t bsize;
 604
 605                 block = udf_new_block(sb, inode,
 606                                 iinfo->i_location.partitionReferenceNum,
 607                                 iinfo->i_location.logicalBlockNum, &err);
 608                 if (!block)
 609                         goto out_no_entry;
 610                 epos.block = iinfo->i_location;
 611                 epos.offset = udf_file_entry_alloc_offset(inode);
 612                 epos.bh = NULL;
 613                 eloc.logicalBlockNum = block;
 614                 eloc.partitionReferenceNum =
 615                                 iinfo->i_location.partitionReferenceNum;
 616                 bsize = sb->s_blocksize;
 617                 iinfo->i_lenExtents = bsize;
 618                 err = udf_add_aext(inode, &epos, &eloc, bsize, 0);
 619                 brelse(epos.bh);
 620                 if (err < 0) {
 621                         udf_free_blocks(sb, inode, &eloc, 0, 1);
 622                         goto out_no_entry;
 623                 }
 624
 625                 block = udf_get_pblock(sb, block,
 626                                 iinfo->i_location.partitionReferenceNum,
 627                                 0);
 628                 epos.bh = sb_getblk(sb, block);
 629                 if (unlikely(!epos.bh)) {
 630                         err = -ENOMEM;
 631                         udf_free_blocks(sb, inode, &eloc, 0, 1);
 632                         goto out_no_entry;
 633                 }
 634                 lock_buffer(epos.bh);
 635                 memset(epos.bh->b_data, 0x00, bsize);
 636                 set_buffer_uptodate(epos.bh);
 637                 unlock_buffer(epos.bh);
 638                 mark_buffer_dirty_inode(epos.bh, inode);
 639                 ea = epos.bh->b_data + udf_ext0_offset(inode);
 640         } else
 641                 ea = iinfo->i_data + iinfo->i_lenEAttr;
 642
 643         eoffset = sb->s_blocksize - udf_ext0_offset(inode);
 644         pc = (struct pathComponent *)ea;
 645
 646         if (*symname == '/') {
 647                 do {
 648                         symname++;
 649                 } while (*symname == '/');
 650
 651                 pc->componentType = 1;
 652                 pc->lengthComponentIdent = 0;
 653                 pc->componentFileVersionNum = 0;
 654                 elen += sizeof(struct pathComponent);
 655         }
 656
 657         err = -ENAMETOOLONG;
 658
 659         while (*symname) {
 660                 if (elen + sizeof(struct pathComponent) > eoffset)
 661                         goto out_no_entry;
 662
 663                 pc = (struct pathComponent *)(ea + elen);
 664
 665                 compstart = symname;
 666
 667                 do {
 668                         symname++;
 669                 } while (*symname && *symname != '/');
 670
 671                 pc->componentType = 5;
 672                 pc->lengthComponentIdent = 0;
 673                 pc->componentFileVersionNum = 0;
 674                 if (compstart[0] == '.') {
 675                         if ((symname - compstart) == 1)
 676                                 pc->componentType = 4;
 677                         else if ((symname - compstart) == 2 &&
 678                                         compstart[1] == '.')
 679                                 pc->componentType = 3;
 680                 }
 681
 682                 if (pc->componentType == 5) {
 683                         namelen = udf_put_filename(sb, compstart,
 684                                                    symname - compstart,
 685                                                    name, UDF_NAME_LEN_CS0);
 686                         if (!namelen)
 687                                 goto out_no_entry;
 688
 689                         if (elen + sizeof(struct pathComponent) + namelen >
 690                                         eoffset)
 691                                 goto out_no_entry;
 692                         else
 693                                 pc->lengthComponentIdent = namelen;
 694
 695                         memcpy(pc->componentIdent, name, namelen);
 696                 }
 697
 698                 elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
 699
 700                 if (*symname) {
 701                         do {
 702                                 symname++;
 703                         } while (*symname == '/');
 704                 }
 705         }
 706
 707         brelse(epos.bh);
 708         inode->i_size = elen;
 709         if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 710                 iinfo->i_lenAlloc = inode->i_size;
 711         else
 712                 udf_truncate_tail_extent(inode);
 713         mark_inode_dirty(inode);
 714         up_write(&iinfo->i_data_sem);
 715
 716         err = udf_add_nondir(dentry, inode);
 717 out:
 718         kfree(name);
 719         return err;
 720
 721 out_no_entry:
 722         up_write(&iinfo->i_data_sem);
 723         inode_dec_link_count(inode);
 724         discard_new_inode(inode);
 725         goto out;
 726 }
 727
 728 static int udf_link(struct dentry *old_dentry, struct inode *dir,
 729                     struct dentry *dentry)
 730 {
 731         struct inode *inode = d_inode(old_dentry);
 732         struct udf_fileident_iter iter;
 733         int err;
 734
 735         err = udf_fiiter_add_entry(dir, dentry, &iter);
 736         if (err)
 737                 return err;
 738         iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
 739         iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
 740         if (UDF_SB(inode->i_sb)->s_lvid_bh) {
 741                 *(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
 742                         cpu_to_le32(lvid_get_unique_id(inode->i_sb));
 743         }
 744         udf_fiiter_write_fi(&iter, NULL);
 745         udf_fiiter_release(&iter);
 746
 747         inc_nlink(inode);
 748         udf_add_fid_counter(dir->i_sb, false, 1);
 749         inode->i_ctime = current_time(inode);
 750         mark_inode_dirty(inode);
 751         dir->i_ctime = dir->i_mtime = current_time(dir);
 752         mark_inode_dirty(dir);
 753         ihold(inode);
 754         d_instantiate(dentry, inode);
 755
 756         return 0;
 757 }
 758
 759 /* Anybody can rename anything with this: the permission checks are left to the
 760  * higher-level routines.
 761  */
 762 static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 763                       struct dentry *old_dentry, struct inode *new_dir,
 764                       struct dentry *new_dentry, unsigned int flags)
 765 {
 766         struct inode *old_inode = d_inode(old_dentry);
 767         struct inode *new_inode = d_inode(new_dentry);
 768         struct udf_fileident_iter oiter, niter, diriter;
 769         bool has_diriter = false;
 770         int retval;
 771         struct kernel_lb_addr tloc;
 772
 773         if (flags & ~RENAME_NOREPLACE)
 774                 return -EINVAL;
 775
 776         retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
 777         if (retval)
 778                 return retval;
 779
 780         tloc = lelb_to_cpu(oiter.fi.icb.extLocation);
 781         if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) {
 782                 retval = -ENOENT;
 783                 goto out_oiter;
 784         }
 785
 786         if (S_ISDIR(old_inode->i_mode)) {
 787                 if (new_inode) {
 788                         retval = -ENOTEMPTY;
 789                         if (!empty_dir(new_inode))
 790                                 goto out_oiter;
 791                 }
 792                 retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
 793                                                &diriter);
 794                 if (retval == -ENOENT) {
 795                         udf_err(old_inode->i_sb,
 796                                 "directory (ino %lu) has no '..' entry\n",
 797                                 old_inode->i_ino);
 798                         retval = -EFSCORRUPTED;
 799                 }
 800                 if (retval)
 801                         goto out_oiter;
 802                 has_diriter = true;
 803                 tloc = lelb_to_cpu(diriter.fi.icb.extLocation);
 804                 if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
 805                                 old_dir->i_ino) {
 806                         retval = -EFSCORRUPTED;
 807                         udf_err(old_inode->i_sb,
 808                                 "directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n",
 809                                 old_inode->i_ino, old_dir->i_ino,
 810                                 udf_get_lb_pblock(old_inode->i_sb, &tloc, 0));
 811                         goto out_oiter;
 812                 }
 813         }
 814
 815         retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter);
 816         if (retval && retval != -ENOENT)
 817                 goto out_oiter;
 818         /* Entry found but not passed by VFS? */
 819         if (!retval && !new_inode) {
 820                 retval = -EFSCORRUPTED;
 821                 udf_fiiter_release(&niter);
 822                 goto out_oiter;
 823         }
 824         /* Entry not found? Need to add one... */
 825         if (retval) {
 826                 udf_fiiter_release(&niter);
 827                 retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter);
 828                 if (retval)
 829                         goto out_oiter;
 830         }
 831
 832         /*
 833          * Like most other Unix systems, set the ctime for inodes on a
 834          * rename.
 835          */
 836         old_inode->i_ctime = current_time(old_inode);
 837         mark_inode_dirty(old_inode);
 838
 839         /*
 840          * ok, that's it
 841          */
 842         niter.fi.fileVersionNum = oiter.fi.fileVersionNum;
 843         niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics;
 844         memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb));
 845         udf_fiiter_write_fi(&niter, NULL);
 846         udf_fiiter_release(&niter);
 847
 848         /*
 849          * The old entry may have moved due to new entry allocation. Find it
 850          * again.
 851          */
 852         udf_fiiter_release(&oiter);
 853         retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
 854         if (retval) {
 855                 udf_err(old_dir->i_sb,
 856                         "failed to find renamed entry again in directory (ino %lu)\n",
 857                         old_dir->i_ino);
 858         } else {
 859                 udf_fiiter_delete_entry(&oiter);
 860                 udf_fiiter_release(&oiter);
 861         }
 862
 863         if (new_inode) {
 864                 new_inode->i_ctime = current_time(new_inode);
 865                 inode_dec_link_count(new_inode);
 866                 udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode),
 867                                     -1);
 868         }
 869         old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
 870         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
 871         mark_inode_dirty(old_dir);
 872         mark_inode_dirty(new_dir);
 873
 874         if (has_diriter) {
 875                 diriter.fi.icb.extLocation =
 876                                         cpu_to_lelb(UDF_I(new_dir)->i_location);
 877                 udf_update_tag((char *)&diriter.fi,
 878                                udf_dir_entry_len(&diriter.fi));
 879                 udf_fiiter_write_fi(&diriter, NULL);
 880                 udf_fiiter_release(&diriter);
 881
 882                 inode_dec_link_count(old_dir);
 883                 if (new_inode)
 884                         inode_dec_link_count(new_inode);
 885                 else {
 886                         inc_nlink(new_dir);
 887                         mark_inode_dirty(new_dir);
 888                 }
 889         }
 890         return 0;
 891 out_oiter:
 892         if (has_diriter)
 893                 udf_fiiter_release(&diriter);
 894         udf_fiiter_release(&oiter);
 895
 896         return retval;
 897 }
 898
 899 static struct dentry *udf_get_parent(struct dentry *child)
 900 {
 901         struct kernel_lb_addr tloc;
 902         struct inode *inode = NULL;
 903         struct udf_fileident_iter iter;
 904         int err;
 905
 906         err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter);
 907         if (err)
 908                 return ERR_PTR(err);
 909
 910         tloc = lelb_to_cpu(iter.fi.icb.extLocation);
 911         udf_fiiter_release(&iter);
 912         inode = udf_iget(child->d_sb, &tloc);
 913         if (IS_ERR(inode))
 914                 return ERR_CAST(inode);
 915
 916         return d_obtain_alias(inode);
 917 }
 918
 919
 920 static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
 921                                         u16 partref, __u32 generation)
 922 {
 923         struct inode *inode;
 924         struct kernel_lb_addr loc;
 925
 926         if (block == 0)
 927                 return ERR_PTR(-ESTALE);
 928
 929         loc.logicalBlockNum = block;
 930         loc.partitionReferenceNum = partref;
 931         inode = udf_iget(sb, &loc);
 932
 933         if (IS_ERR(inode))
 934                 return ERR_CAST(inode);
 935
 936         if (generation && inode->i_generation != generation) {
 937                 iput(inode);
 938                 return ERR_PTR(-ESTALE);
 939         }
 940         return d_obtain_alias(inode);
 941 }
 942
 943 static struct dentry *udf_fh_to_dentry(struct super_block *sb,
 944                                        struct fid *fid, int fh_len, int fh_type)
 945 {
 946         if (fh_len < 3 ||
 947             (fh_type != FILEID_UDF_WITH_PARENT &&
 948              fh_type != FILEID_UDF_WITHOUT_PARENT))
 949                 return NULL;
 950
 951         return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
 952                         fid->udf.generation);
 953 }
 954
 955 static struct dentry *udf_fh_to_parent(struct super_block *sb,
 956                                        struct fid *fid, int fh_len, int fh_type)
 957 {
 958         if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
 959                 return NULL;
 960
 961         return udf_nfs_get_inode(sb, fid->udf.parent_block,
 962                                  fid->udf.parent_partref,
 963                                  fid->udf.parent_generation);
 964 }
 965 static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
 966                          struct inode *parent)
 967 {
 968         int len = *lenp;
 969         struct kernel_lb_addr location = UDF_I(inode)->i_location;
 970         struct fid *fid = (struct fid *)fh;
 971         int type = FILEID_UDF_WITHOUT_PARENT;
 972
 973         if (parent && (len < 5)) {
 974                 *lenp = 5;
 975                 return FILEID_INVALID;
 976         } else if (len < 3) {
 977                 *lenp = 3;
 978                 return FILEID_INVALID;
 979         }
 980
 981         *lenp = 3;
 982         fid->udf.block = location.logicalBlockNum;
 983         fid->udf.partref = location.partitionReferenceNum;
 984         fid->udf.parent_partref = 0;
 985         fid->udf.generation = inode->i_generation;
 986
 987         if (parent) {
 988                 location = UDF_I(parent)->i_location;
 989                 fid->udf.parent_block = location.logicalBlockNum;
 990                 fid->udf.parent_partref = location.partitionReferenceNum;
 991                 fid->udf.parent_generation = inode->i_generation;
 992                 *lenp = 5;
 993                 type = FILEID_UDF_WITH_PARENT;
 994         }
 995
 996         return type;
 997 }
 998
 999 const struct export_operations udf_export_ops = {
1000         .encode_fh      = udf_encode_fh,
1001         .fh_to_dentry   = udf_fh_to_dentry,
1002         .fh_to_parent   = udf_fh_to_parent,
1003         .get_parent     = udf_get_parent,
1004 };
1005
1006 const struct inode_operations udf_dir_inode_operations = {
1007         .lookup                         = udf_lookup,
1008         .create                         = udf_create,
1009         .link                           = udf_link,
1010         .unlink                         = udf_unlink,
1011         .symlink                        = udf_symlink,
1012         .mkdir                          = udf_mkdir,
1013         .rmdir                          = udf_rmdir,
1014         .mknod                          = udf_mknod,
1015         .rename                         = udf_rename,
1016         .tmpfile                        = udf_tmpfile,
1017 };