fs/reiserfs/namei.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  *
   4  * Trivial changes by Alan Cox to remove EHASHCOLLISION for compatibility
   5  *
   6  * Trivial Changes:
   7  * Rights granted to Hans Reiser to redistribute under other terms providing
   8  * he accepts all liability including but not limited to patent, fitness
   9  * for purpose, and direct or indirect claims arising from failure to perform.
  10  *
  11  * NO WARRANTY
  12  */
  13
  14 #include <linux/time.h>
  15 #include <linux/bitops.h>
  16 #include <linux/slab.h>
  17 #include "reiserfs.h"
  18 #include "acl.h"
  19 #include "xattr.h"
  20 #include <linux/quotaops.h>
  21
  22 #define INC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) { inc_nlink(i); if (i->i_nlink >= REISERFS_LINK_MAX) set_nlink(i, 1); }
  23 #define DEC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) drop_nlink(i);
  24
  25 /*
  26  * directory item contains array of entry headers. This performs
  27  * binary search through that array
  28  */
  29 static int bin_search_in_dir_item(struct reiserfs_dir_entry *de, loff_t off)
  30 {
  31         struct item_head *ih = de->de_ih;
  32         struct reiserfs_de_head *deh = de->de_deh;
  33         int rbound, lbound, j;
  34
  35         lbound = 0;
  36         rbound = ih_entry_count(ih) - 1;
  37
  38         for (j = (rbound + lbound) / 2; lbound <= rbound;
  39              j = (rbound + lbound) / 2) {
  40                 if (off < deh_offset(deh + j)) {
  41                         rbound = j - 1;
  42                         continue;
  43                 }
  44                 if (off > deh_offset(deh + j)) {
  45                         lbound = j + 1;
  46                         continue;
  47                 }
  48                 /* this is not name found, but matched third key component */
  49                 de->de_entry_num = j;
  50                 return NAME_FOUND;
  51         }
  52
  53         de->de_entry_num = lbound;
  54         return NAME_NOT_FOUND;
  55 }
  56
  57 /*
  58  * comment?  maybe something like set de to point to what the path points to?
  59  */
  60 static inline void set_de_item_location(struct reiserfs_dir_entry *de,
  61                                         struct treepath *path)
  62 {
  63         de->de_bh = get_last_bh(path);
  64         de->de_ih = tp_item_head(path);
  65         de->de_deh = B_I_DEH(de->de_bh, de->de_ih);
  66         de->de_item_num = PATH_LAST_POSITION(path);
  67 }
  68
  69 /*
  70  * de_bh, de_ih, de_deh (points to first element of array), de_item_num is set
  71  */
  72 inline void set_de_name_and_namelen(struct reiserfs_dir_entry *de)
  73 {
  74         struct reiserfs_de_head *deh = de->de_deh + de->de_entry_num;
  75
  76         BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));
  77
  78         de->de_entrylen = entry_length(de->de_bh, de->de_ih, de->de_entry_num);
  79         de->de_namelen = de->de_entrylen - (de_with_sd(deh) ? SD_SIZE : 0);
  80         de->de_name = ih_item_body(de->de_bh, de->de_ih) + deh_location(deh);
  81         if (de->de_name[de->de_namelen - 1] == 0)
  82                 de->de_namelen = strlen(de->de_name);
  83 }
  84
  85 /* what entry points to */
  86 static inline void set_de_object_key(struct reiserfs_dir_entry *de)
  87 {
  88         BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));
  89         de->de_dir_id = deh_dir_id(&de->de_deh[de->de_entry_num]);
  90         de->de_objectid = deh_objectid(&de->de_deh[de->de_entry_num]);
  91 }
  92
  93 static inline void store_de_entry_key(struct reiserfs_dir_entry *de)
  94 {
  95         struct reiserfs_de_head *deh = de->de_deh + de->de_entry_num;
  96
  97         BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));
  98
  99         /* store key of the found entry */
 100         de->de_entry_key.version = KEY_FORMAT_3_5;
 101         de->de_entry_key.on_disk_key.k_dir_id =
 102             le32_to_cpu(de->de_ih->ih_key.k_dir_id);
 103         de->de_entry_key.on_disk_key.k_objectid =
 104             le32_to_cpu(de->de_ih->ih_key.k_objectid);
 105         set_cpu_key_k_offset(&de->de_entry_key, deh_offset(deh));
 106         set_cpu_key_k_type(&de->de_entry_key, TYPE_DIRENTRY);
 107 }
 108
 109 /*
 110  * We assign a key to each directory item, and place multiple entries in a
 111  * single directory item.  A directory item has a key equal to the key of
 112  * the first directory entry in it.
 113
 114  * This function first calls search_by_key, then, if item whose first entry
 115  * matches is not found it looks for the entry inside directory item found
 116  * by search_by_key. Fills the path to the entry, and to the entry position
 117  * in the item
 118  */
 119 /* The function is NOT SCHEDULE-SAFE! */
 120 int search_by_entry_key(struct super_block *sb, const struct cpu_key *key,
 121                         struct treepath *path, struct reiserfs_dir_entry *de)
 122 {
 123         int retval;
 124
 125         retval = search_item(sb, key, path);
 126         switch (retval) {
 127         case ITEM_NOT_FOUND:
 128                 if (!PATH_LAST_POSITION(path)) {
 129                         reiserfs_error(sb, "vs-7000", "search_by_key "
 130                                        "returned item position == 0");
 131                         pathrelse(path);
 132                         return IO_ERROR;
 133                 }
 134                 PATH_LAST_POSITION(path)--;
 135                 break;
 136
 137         case ITEM_FOUND:
 138                 break;
 139
 140         case IO_ERROR:
 141                 return retval;
 142
 143         default:
 144                 pathrelse(path);
 145                 reiserfs_error(sb, "vs-7002", "no path to here");
 146                 return IO_ERROR;
 147         }
 148
 149         set_de_item_location(de, path);
 150
 151 #ifdef CONFIG_REISERFS_CHECK
 152         if (!is_direntry_le_ih(de->de_ih) ||
 153             COMP_SHORT_KEYS(&de->de_ih->ih_key, key)) {
 154                 print_block(de->de_bh, 0, -1, -1);
 155                 reiserfs_panic(sb, "vs-7005", "found item %h is not directory "
 156                                "item or does not belong to the same directory "
 157                                "as key %K", de->de_ih, key);
 158         }
 159 #endif                          /* CONFIG_REISERFS_CHECK */
 160
 161         /*
 162          * binary search in directory item by third component of the
 163          * key. sets de->de_entry_num of de
 164          */
 165         retval = bin_search_in_dir_item(de, cpu_key_k_offset(key));
 166         path->pos_in_item = de->de_entry_num;
 167         if (retval != NAME_NOT_FOUND) {
 168                 /*
 169                  * ugly, but rename needs de_bh, de_deh, de_name,
 170                  * de_namelen, de_objectid set
 171                  */
 172                 set_de_name_and_namelen(de);
 173                 set_de_object_key(de);
 174         }
 175         return retval;
 176 }
 177
 178 /* Keyed 32-bit hash function using TEA in a Davis-Meyer function */
 179
 180 /*
 181  * The third component is hashed, and you can choose from more than
 182  * one hash function.  Per directory hashes are not yet implemented
 183  * but are thought about. This function should be moved to hashes.c
 184  * Jedi, please do so.  -Hans
 185  */
 186 static __u32 get_third_component(struct super_block *s,
 187                                  const char *name, int len)
 188 {
 189         __u32 res;
 190
 191         if (!len || (len == 1 && name[0] == '.'))
 192                 return DOT_OFFSET;
 193         if (len == 2 && name[0] == '.' && name[1] == '.')
 194                 return DOT_DOT_OFFSET;
 195
 196         res = REISERFS_SB(s)->s_hash_function(name, len);
 197
 198         /* take bits from 7-th to 30-th including both bounds */
 199         res = GET_HASH_VALUE(res);
 200         if (res == 0)
 201                 /*
 202                  * needed to have no names before "." and ".." those have hash
 203                  * value == 0 and generation conters 1 and 2 accordingly
 204                  */
 205                 res = 128;
 206         return res + MAX_GENERATION_NUMBER;
 207 }
 208
 209 static int reiserfs_match(struct reiserfs_dir_entry *de,
 210                           const char *name, int namelen)
 211 {
 212         int retval = NAME_NOT_FOUND;
 213
 214         if ((namelen == de->de_namelen) &&
 215             !memcmp(de->de_name, name, de->de_namelen))
 216                 retval =
 217                     (de_visible(de->de_deh + de->de_entry_num) ? NAME_FOUND :
 218                      NAME_FOUND_INVISIBLE);
 219
 220         return retval;
 221 }
 222
 223 /* de's de_bh, de_ih, de_deh, de_item_num, de_entry_num are set already */
 224
 225 /* used when hash collisions exist */
 226
 227 static int linear_search_in_dir_item(struct cpu_key *key,
 228                                      struct reiserfs_dir_entry *de,
 229                                      const char *name, int namelen)
 230 {
 231         struct reiserfs_de_head *deh = de->de_deh;
 232         int retval;
 233         int i;
 234
 235         i = de->de_entry_num;
 236
 237         if (i == ih_entry_count(de->de_ih) ||
 238             GET_HASH_VALUE(deh_offset(deh + i)) !=
 239             GET_HASH_VALUE(cpu_key_k_offset(key))) {
 240                 i--;
 241         }
 242
 243         RFALSE(de->de_deh != B_I_DEH(de->de_bh, de->de_ih),
 244                "vs-7010: array of entry headers not found");
 245
 246         deh += i;
 247
 248         for (; i >= 0; i--, deh--) {
 249                 /* hash value does not match, no need to check whole name */
 250                 if (GET_HASH_VALUE(deh_offset(deh)) !=
 251                     GET_HASH_VALUE(cpu_key_k_offset(key))) {
 252                         return NAME_NOT_FOUND;
 253                 }
 254
 255                 /* mark that this generation number is used */
 256                 if (de->de_gen_number_bit_string)
 257                         set_bit(GET_GENERATION_NUMBER(deh_offset(deh)),
 258                                 de->de_gen_number_bit_string);
 259
 260                 /* calculate pointer to name and namelen */
 261                 de->de_entry_num = i;
 262                 set_de_name_and_namelen(de);
 263
 264                 /*
 265                  * de's de_name, de_namelen, de_recordlen are set.
 266                  * Fill the rest.
 267                  */
 268                 if ((retval =
 269                      reiserfs_match(de, name, namelen)) != NAME_NOT_FOUND) {
 270
 271                         /* key of pointed object */
 272                         set_de_object_key(de);
 273
 274                         store_de_entry_key(de);
 275
 276                         /* retval can be NAME_FOUND or NAME_FOUND_INVISIBLE */
 277                         return retval;
 278                 }
 279         }
 280
 281         if (GET_GENERATION_NUMBER(le_ih_k_offset(de->de_ih)) == 0)
 282                 /*
 283                  * we have reached left most entry in the node. In common we
 284                  * have to go to the left neighbor, but if generation counter
 285                  * is 0 already, we know for sure, that there is no name with
 286                  * the same hash value
 287                  */
 288                 /*
 289                  * FIXME: this work correctly only because hash value can not
 290                  *  be 0. Btw, in case of Yura's hash it is probably possible,
 291                  * so, this is a bug
 292                  */
 293                 return NAME_NOT_FOUND;
 294
 295         RFALSE(de->de_item_num,
 296                "vs-7015: two diritems of the same directory in one node?");
 297
 298         return GOTO_PREVIOUS_ITEM;
 299 }
 300
 301 /*
 302  * may return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND
 303  * FIXME: should add something like IOERROR
 304  */
 305 static int reiserfs_find_entry(struct inode *dir, const char *name, int namelen,
 306                                struct treepath *path_to_entry,
 307                                struct reiserfs_dir_entry *de)
 308 {
 309         struct cpu_key key_to_search;
 310         int retval;
 311
 312         if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
 313                 return NAME_NOT_FOUND;
 314
 315         /* we will search for this key in the tree */
 316         make_cpu_key(&key_to_search, dir,
 317                      get_third_component(dir->i_sb, name, namelen),
 318                      TYPE_DIRENTRY, 3);
 319
 320         while (1) {
 321                 retval =
 322                     search_by_entry_key(dir->i_sb, &key_to_search,
 323                                         path_to_entry, de);
 324                 if (retval == IO_ERROR) {
 325                         reiserfs_error(dir->i_sb, "zam-7001", "io error");
 326                         return IO_ERROR;
 327                 }
 328
 329                 /* compare names for all entries having given hash value */
 330                 retval =
 331                     linear_search_in_dir_item(&key_to_search, de, name,
 332                                               namelen);
 333                 /*
 334                  * there is no need to scan directory anymore.
 335                  * Given entry found or does not exist
 336                  */
 337                 if (retval != GOTO_PREVIOUS_ITEM) {
 338                         path_to_entry->pos_in_item = de->de_entry_num;
 339                         return retval;
 340                 }
 341
 342                 /*
 343                  * there is left neighboring item of this directory
 344                  * and given entry can be there
 345                  */
 346                 set_cpu_key_k_offset(&key_to_search,
 347                                      le_ih_k_offset(de->de_ih) - 1);
 348                 pathrelse(path_to_entry);
 349
 350         }                       /* while (1) */
 351 }
 352
 353 static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
 354                                       unsigned int flags)
 355 {
 356         int retval;
 357         struct inode *inode = NULL;
 358         struct reiserfs_dir_entry de;
 359         INITIALIZE_PATH(path_to_entry);
 360
 361         if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
 362                 return ERR_PTR(-ENAMETOOLONG);
 363
 364         reiserfs_write_lock(dir->i_sb);
 365
 366         de.de_gen_number_bit_string = NULL;
 367         retval =
 368             reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
 369                                 &path_to_entry, &de);
 370         pathrelse(&path_to_entry);
 371         if (retval == NAME_FOUND) {
 372                 inode = reiserfs_iget(dir->i_sb,
 373                                       (struct cpu_key *)&de.de_dir_id);
 374                 if (!inode || IS_ERR(inode)) {
 375                         reiserfs_write_unlock(dir->i_sb);
 376                         return ERR_PTR(-EACCES);
 377                 }
 378
 379                 /*
 380                  * Propagate the private flag so we know we're
 381                  * in the priv tree.  Also clear xattr support
 382                  * since we don't have xattrs on xattr files.
 383                  */
 384                 if (IS_PRIVATE(dir))
 385                         reiserfs_init_priv_inode(inode);
 386         }
 387         reiserfs_write_unlock(dir->i_sb);
 388         if (retval == IO_ERROR) {
 389                 return ERR_PTR(-EIO);
 390         }
 391
 392         return d_splice_alias(inode, dentry);
 393 }
 394
 395 /*
 396  * looks up the dentry of the parent directory for child.
 397  * taken from ext2_get_parent
 398  */
 399 struct dentry *reiserfs_get_parent(struct dentry *child)
 400 {
 401         int retval;
 402         struct inode *inode = NULL;
 403         struct reiserfs_dir_entry de;
 404         INITIALIZE_PATH(path_to_entry);
 405         struct inode *dir = d_inode(child);
 406
 407         if (dir->i_nlink == 0) {
 408                 return ERR_PTR(-ENOENT);
 409         }
 410         de.de_gen_number_bit_string = NULL;
 411
 412         reiserfs_write_lock(dir->i_sb);
 413         retval = reiserfs_find_entry(dir, "..", 2, &path_to_entry, &de);
 414         pathrelse(&path_to_entry);
 415         if (retval != NAME_FOUND) {
 416                 reiserfs_write_unlock(dir->i_sb);
 417                 return ERR_PTR(-ENOENT);
 418         }
 419         inode = reiserfs_iget(dir->i_sb, (struct cpu_key *)&de.de_dir_id);
 420         reiserfs_write_unlock(dir->i_sb);
 421
 422         return d_obtain_alias(inode);
 423 }
 424
 425 /* add entry to the directory (entry can be hidden).
 426
 427 insert definition of when hidden directories are used here -Hans
 428
 429  Does not mark dir   inode dirty, do it after successesfull call to it */
 430
 431 static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
 432                               struct inode *dir, const char *name, int namelen,
 433                               struct inode *inode, int visible)
 434 {
 435         struct cpu_key entry_key;
 436         struct reiserfs_de_head *deh;
 437         INITIALIZE_PATH(path);
 438         struct reiserfs_dir_entry de;
 439         DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1);
 440         int gen_number;
 441
 442         /*
 443          * 48 bytes now and we avoid kmalloc if we
 444          * create file with short name
 445          */
 446         char small_buf[32 + DEH_SIZE];
 447
 448         char *buffer;
 449         int buflen, paste_size;
 450         int retval;
 451
 452         BUG_ON(!th->t_trans_id);
 453
 454         /* cannot allow items to be added into a busy deleted directory */
 455         if (!namelen)
 456                 return -EINVAL;
 457
 458         if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
 459                 return -ENAMETOOLONG;
 460
 461         /* each entry has unique key. compose it */
 462         make_cpu_key(&entry_key, dir,
 463                      get_third_component(dir->i_sb, name, namelen),
 464                      TYPE_DIRENTRY, 3);
 465
 466         /* get memory for composing the entry */
 467         buflen = DEH_SIZE + ROUND_UP(namelen);
 468         if (buflen > sizeof(small_buf)) {
 469                 buffer = kmalloc(buflen, GFP_NOFS);
 470                 if (!buffer)
 471                         return -ENOMEM;
 472         } else
 473                 buffer = small_buf;
 474
 475         paste_size =
 476             (get_inode_sd_version(dir) ==
 477              STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen;
 478
 479         /*
 480          * fill buffer : directory entry head, name[, dir objectid | ,
 481          * stat data | ,stat data, dir objectid ]
 482          */
 483         deh = (struct reiserfs_de_head *)buffer;
 484         deh->deh_location = 0;  /* JDM Endian safe if 0 */
 485         put_deh_offset(deh, cpu_key_k_offset(&entry_key));
 486         deh->deh_state = 0;     /* JDM Endian safe if 0 */
 487         /* put key (ino analog) to de */
 488
 489         /* safe: k_dir_id is le */
 490         deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id;
 491         /* safe: k_objectid is le */
 492         deh->deh_objectid = INODE_PKEY(inode)->k_objectid;
 493
 494         /* copy name */
 495         memcpy((char *)(deh + 1), name, namelen);
 496         /* padd by 0s to the 4 byte boundary */
 497         padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen);
 498
 499         /*
 500          * entry is ready to be pasted into tree, set 'visibility'
 501          * and 'stat data in entry' attributes
 502          */
 503         mark_de_without_sd(deh);
 504         visible ? mark_de_visible(deh) : mark_de_hidden(deh);
 505
 506         /* find the proper place for the new entry */
 507         memset(bit_string, 0, sizeof(bit_string));
 508         de.de_gen_number_bit_string = bit_string;
 509         retval = reiserfs_find_entry(dir, name, namelen, &path, &de);
 510         if (retval != NAME_NOT_FOUND) {
 511                 if (buffer != small_buf)
 512                         kfree(buffer);
 513                 pathrelse(&path);
 514
 515                 if (retval == IO_ERROR) {
 516                         return -EIO;
 517                 }
 518
 519                 if (retval != NAME_FOUND) {
 520                         reiserfs_error(dir->i_sb, "zam-7002",
 521                                        "reiserfs_find_entry() returned "
 522                                        "unexpected value (%d)", retval);
 523                 }
 524
 525                 return -EEXIST;
 526         }
 527
 528         gen_number =
 529             find_first_zero_bit(bit_string,
 530                                 MAX_GENERATION_NUMBER + 1);
 531         if (gen_number > MAX_GENERATION_NUMBER) {
 532                 /* there is no free generation number */
 533                 reiserfs_warning(dir->i_sb, "reiserfs-7010",
 534                                  "Congratulations! we have got hash function "
 535                                  "screwed up");
 536                 if (buffer != small_buf)
 537                         kfree(buffer);
 538                 pathrelse(&path);
 539                 return -EBUSY;
 540         }
 541         /* adjust offset of directory enrty */
 542         put_deh_offset(deh, SET_GENERATION_NUMBER(deh_offset(deh), gen_number));
 543         set_cpu_key_k_offset(&entry_key, deh_offset(deh));
 544
 545         /* update max-hash-collisions counter in reiserfs_sb_info */
 546         PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number);
 547
 548         /* we need to re-search for the insertion point */
 549         if (gen_number != 0) {
 550                 if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) !=
 551                     NAME_NOT_FOUND) {
 552                         reiserfs_warning(dir->i_sb, "vs-7032",
 553                                          "entry with this key (%K) already "
 554                                          "exists", &entry_key);
 555
 556                         if (buffer != small_buf)
 557                                 kfree(buffer);
 558                         pathrelse(&path);
 559                         return -EBUSY;
 560                 }
 561         }
 562
 563         /* perform the insertion of the entry that we have prepared */
 564         retval =
 565             reiserfs_paste_into_item(th, &path, &entry_key, dir, buffer,
 566                                      paste_size);
 567         if (buffer != small_buf)
 568                 kfree(buffer);
 569         if (retval) {
 570                 reiserfs_check_path(&path);
 571                 return retval;
 572         }
 573
 574         dir->i_size += paste_size;
 575         dir->i_mtime = inode_set_ctime_current(dir);
 576         if (!S_ISDIR(inode->i_mode) && visible)
 577                 /* reiserfs_mkdir or reiserfs_rename will do that by itself */
 578                 reiserfs_update_sd(th, dir);
 579
 580         reiserfs_check_path(&path);
 581         return 0;
 582 }
 583
 584 /*
 585  * quota utility function, call if you've had to abort after calling
 586  * new_inode_init, and have not called reiserfs_new_inode yet.
 587  * This should only be called on inodes that do not have stat data
 588  * inserted into the tree yet.
 589  */
 590 static int drop_new_inode(struct inode *inode)
 591 {
 592         dquot_drop(inode);
 593         make_bad_inode(inode);
 594         inode->i_flags |= S_NOQUOTA;
 595         iput(inode);
 596         return 0;
 597 }
 598
 599 /*
 600  * utility function that does setup for reiserfs_new_inode.
 601  * dquot_initialize needs lots of credits so it's better to have it
 602  * outside of a transaction, so we had to pull some bits of
 603  * reiserfs_new_inode out into this func.
 604  */
 605 static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode)
 606 {
 607         /*
 608          * Make inode invalid - just in case we are going to drop it before
 609          * the initialization happens
 610          */
 611         INODE_PKEY(inode)->k_objectid = 0;
 612
 613         /*
 614          * the quota init calls have to know who to charge the quota to, so
 615          * we have to set uid and gid here
 616          */
 617         inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
 618         return dquot_initialize(inode);
 619 }
 620
 621 static int reiserfs_create(struct mnt_idmap *idmap, struct inode *dir,
 622                            struct dentry *dentry, umode_t mode, bool excl)
 623 {
 624         int retval;
 625         struct inode *inode;
 626         /*
 627          * We need blocks for transaction + (user+group)*(quotas
 628          * for new inode + update of quota for directory owner)
 629          */
 630         int jbegin_count =
 631             JOURNAL_PER_BALANCE_CNT * 2 +
 632             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
 633                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
 634         struct reiserfs_transaction_handle th;
 635         struct reiserfs_security_handle security;
 636
 637         retval = dquot_initialize(dir);
 638         if (retval)
 639                 return retval;
 640
 641         if (!(inode = new_inode(dir->i_sb))) {
 642                 return -ENOMEM;
 643         }
 644         retval = new_inode_init(inode, dir, mode);
 645         if (retval) {
 646                 drop_new_inode(inode);
 647                 return retval;
 648         }
 649
 650         jbegin_count += reiserfs_cache_default_acl(dir);
 651         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
 652         if (retval < 0) {
 653                 drop_new_inode(inode);
 654                 return retval;
 655         }
 656         jbegin_count += retval;
 657         reiserfs_write_lock(dir->i_sb);
 658
 659         retval = journal_begin(&th, dir->i_sb, jbegin_count);
 660         if (retval) {
 661                 drop_new_inode(inode);
 662                 goto out_failed;
 663         }
 664
 665         retval =
 666             reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
 667                                inode, &security);
 668         if (retval)
 669                 goto out_failed;
 670
 671         inode->i_op = &reiserfs_file_inode_operations;
 672         inode->i_fop = &reiserfs_file_operations;
 673         inode->i_mapping->a_ops = &reiserfs_address_space_operations;
 674
 675         retval =
 676             reiserfs_add_entry(&th, dir, dentry->d_name.name,
 677                                dentry->d_name.len, inode, 1 /*visible */ );
 678         if (retval) {
 679                 int err;
 680                 drop_nlink(inode);
 681                 reiserfs_update_sd(&th, inode);
 682                 err = journal_end(&th);
 683                 if (err)
 684                         retval = err;
 685                 unlock_new_inode(inode);
 686                 iput(inode);
 687                 goto out_failed;
 688         }
 689         reiserfs_update_inode_transaction(inode);
 690         reiserfs_update_inode_transaction(dir);
 691
 692         d_instantiate_new(dentry, inode);
 693         retval = journal_end(&th);
 694
 695 out_failed:
 696         reiserfs_write_unlock(dir->i_sb);
 697         reiserfs_security_free(&security);
 698         return retval;
 699 }
 700
 701 static int reiserfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
 702                           struct dentry *dentry, umode_t mode, dev_t rdev)
 703 {
 704         int retval;
 705         struct inode *inode;
 706         struct reiserfs_transaction_handle th;
 707         struct reiserfs_security_handle security;
 708         /*
 709          * We need blocks for transaction + (user+group)*(quotas
 710          * for new inode + update of quota for directory owner)
 711          */
 712         int jbegin_count =
 713             JOURNAL_PER_BALANCE_CNT * 3 +
 714             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
 715                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
 716
 717         retval = dquot_initialize(dir);
 718         if (retval)
 719                 return retval;
 720
 721         if (!(inode = new_inode(dir->i_sb))) {
 722                 return -ENOMEM;
 723         }
 724         retval = new_inode_init(inode, dir, mode);
 725         if (retval) {
 726                 drop_new_inode(inode);
 727                 return retval;
 728         }
 729
 730         jbegin_count += reiserfs_cache_default_acl(dir);
 731         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
 732         if (retval < 0) {
 733                 drop_new_inode(inode);
 734                 return retval;
 735         }
 736         jbegin_count += retval;
 737         reiserfs_write_lock(dir->i_sb);
 738
 739         retval = journal_begin(&th, dir->i_sb, jbegin_count);
 740         if (retval) {
 741                 drop_new_inode(inode);
 742                 goto out_failed;
 743         }
 744
 745         retval =
 746             reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
 747                                inode, &security);
 748         if (retval) {
 749                 goto out_failed;
 750         }
 751
 752         inode->i_op = &reiserfs_special_inode_operations;
 753         init_special_inode(inode, inode->i_mode, rdev);
 754
 755         /* FIXME: needed for block and char devices only */
 756         reiserfs_update_sd(&th, inode);
 757
 758         reiserfs_update_inode_transaction(inode);
 759         reiserfs_update_inode_transaction(dir);
 760
 761         retval =
 762             reiserfs_add_entry(&th, dir, dentry->d_name.name,
 763                                dentry->d_name.len, inode, 1 /*visible */ );
 764         if (retval) {
 765                 int err;
 766                 drop_nlink(inode);
 767                 reiserfs_update_sd(&th, inode);
 768                 err = journal_end(&th);
 769                 if (err)
 770                         retval = err;
 771                 unlock_new_inode(inode);
 772                 iput(inode);
 773                 goto out_failed;
 774         }
 775
 776         d_instantiate_new(dentry, inode);
 777         retval = journal_end(&th);
 778
 779 out_failed:
 780         reiserfs_write_unlock(dir->i_sb);
 781         reiserfs_security_free(&security);
 782         return retval;
 783 }
 784
 785 static int reiserfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 786                           struct dentry *dentry, umode_t mode)
 787 {
 788         int retval;
 789         struct inode *inode;
 790         struct reiserfs_transaction_handle th;
 791         struct reiserfs_security_handle security;
 792         /*
 793          * We need blocks for transaction + (user+group)*(quotas
 794          * for new inode + update of quota for directory owner)
 795          */
 796         int jbegin_count =
 797             JOURNAL_PER_BALANCE_CNT * 3 +
 798             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
 799                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
 800
 801         retval = dquot_initialize(dir);
 802         if (retval)
 803                 return retval;
 804
 805 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
 806         /*
 807          * set flag that new packing locality created and new blocks
 808          * for the content of that directory are not displaced yet
 809          */
 810         REISERFS_I(dir)->new_packing_locality = 1;
 811 #endif
 812         mode = S_IFDIR | mode;
 813         if (!(inode = new_inode(dir->i_sb))) {
 814                 return -ENOMEM;
 815         }
 816         retval = new_inode_init(inode, dir, mode);
 817         if (retval) {
 818                 drop_new_inode(inode);
 819                 return retval;
 820         }
 821
 822         jbegin_count += reiserfs_cache_default_acl(dir);
 823         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
 824         if (retval < 0) {
 825                 drop_new_inode(inode);
 826                 return retval;
 827         }
 828         jbegin_count += retval;
 829         reiserfs_write_lock(dir->i_sb);
 830
 831         retval = journal_begin(&th, dir->i_sb, jbegin_count);
 832         if (retval) {
 833                 drop_new_inode(inode);
 834                 goto out_failed;
 835         }
 836
 837         /*
 838          * inc the link count now, so another writer doesn't overflow
 839          * it while we sleep later on.
 840          */
 841         INC_DIR_INODE_NLINK(dir)
 842
 843         retval = reiserfs_new_inode(&th, dir, mode, NULL /*symlink */,
 844                                     old_format_only(dir->i_sb) ?
 845                                     EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
 846                                     dentry, inode, &security);
 847         if (retval) {
 848                 DEC_DIR_INODE_NLINK(dir)
 849                 goto out_failed;
 850         }
 851
 852         reiserfs_update_inode_transaction(inode);
 853         reiserfs_update_inode_transaction(dir);
 854
 855         inode->i_op = &reiserfs_dir_inode_operations;
 856         inode->i_fop = &reiserfs_dir_operations;
 857
 858         /* note, _this_ add_entry will not update dir's stat data */
 859         retval =
 860             reiserfs_add_entry(&th, dir, dentry->d_name.name,
 861                                dentry->d_name.len, inode, 1 /*visible */ );
 862         if (retval) {
 863                 int err;
 864                 clear_nlink(inode);
 865                 DEC_DIR_INODE_NLINK(dir);
 866                 reiserfs_update_sd(&th, inode);
 867                 err = journal_end(&th);
 868                 if (err)
 869                         retval = err;
 870                 unlock_new_inode(inode);
 871                 iput(inode);
 872                 goto out_failed;
 873         }
 874         /* the above add_entry did not update dir's stat data */
 875         reiserfs_update_sd(&th, dir);
 876
 877         d_instantiate_new(dentry, inode);
 878         retval = journal_end(&th);
 879 out_failed:
 880         reiserfs_write_unlock(dir->i_sb);
 881         reiserfs_security_free(&security);
 882         return retval;
 883 }
 884
 885 static inline int reiserfs_empty_dir(struct inode *inode)
 886 {
 887         /*
 888          * we can cheat because an old format dir cannot have
 889          * EMPTY_DIR_SIZE, and a new format dir cannot have
 890          * EMPTY_DIR_SIZE_V1.  So, if the inode is either size,
 891          * regardless of disk format version, the directory is empty.
 892          */
 893         if (inode->i_size != EMPTY_DIR_SIZE &&
 894             inode->i_size != EMPTY_DIR_SIZE_V1) {
 895                 return 0;
 896         }
 897         return 1;
 898 }
 899
 900 static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry)
 901 {
 902         int retval, err;
 903         struct inode *inode;
 904         struct reiserfs_transaction_handle th;
 905         int jbegin_count;
 906         INITIALIZE_PATH(path);
 907         struct reiserfs_dir_entry de;
 908
 909         /*
 910          * we will be doing 2 balancings and update 2 stat data, we
 911          * change quotas of the owner of the directory and of the owner
 912          * of the parent directory.  The quota structure is possibly
 913          * deleted only on last iput => outside of this transaction
 914          */
 915         jbegin_count =
 916             JOURNAL_PER_BALANCE_CNT * 2 + 2 +
 917             4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
 918
 919         retval = dquot_initialize(dir);
 920         if (retval)
 921                 return retval;
 922
 923         reiserfs_write_lock(dir->i_sb);
 924         retval = journal_begin(&th, dir->i_sb, jbegin_count);
 925         if (retval)
 926                 goto out_rmdir;
 927
 928         de.de_gen_number_bit_string = NULL;
 929         if ((retval =
 930              reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
 931                                  &path, &de)) == NAME_NOT_FOUND) {
 932                 retval = -ENOENT;
 933                 goto end_rmdir;
 934         } else if (retval == IO_ERROR) {
 935                 retval = -EIO;
 936                 goto end_rmdir;
 937         }
 938
 939         inode = d_inode(dentry);
 940
 941         reiserfs_update_inode_transaction(inode);
 942         reiserfs_update_inode_transaction(dir);
 943
 944         if (de.de_objectid != inode->i_ino) {
 945                 /*
 946                  * FIXME: compare key of an object and a key found in the entry
 947                  */
 948                 retval = -EIO;
 949                 goto end_rmdir;
 950         }
 951         if (!reiserfs_empty_dir(inode)) {
 952                 retval = -ENOTEMPTY;
 953                 goto end_rmdir;
 954         }
 955
 956         /* cut entry from dir directory */
 957         retval = reiserfs_cut_from_item(&th, &path, &de.de_entry_key,
 958                                         dir, NULL,      /* page */
 959                                         0 /*new file size - not used here */ );
 960         if (retval < 0)
 961                 goto end_rmdir;
 962
 963         if (inode->i_nlink != 2 && inode->i_nlink != 1)
 964                 reiserfs_error(inode->i_sb, "reiserfs-7040",
 965                                "empty directory has nlink != 2 (%d)",
 966                                inode->i_nlink);
 967
 968         clear_nlink(inode);
 969         dir->i_mtime = inode_set_ctime_to_ts(dir,
 970                                              inode_set_ctime_current(inode));
 971         reiserfs_update_sd(&th, inode);
 972
 973         DEC_DIR_INODE_NLINK(dir)
 974         dir->i_size -= (DEH_SIZE + de.de_entrylen);
 975         reiserfs_update_sd(&th, dir);
 976
 977         /* prevent empty directory from getting lost */
 978         add_save_link(&th, inode, 0 /* not truncate */ );
 979
 980         retval = journal_end(&th);
 981         reiserfs_check_path(&path);
 982 out_rmdir:
 983         reiserfs_write_unlock(dir->i_sb);
 984         return retval;
 985
 986 end_rmdir:
 987         /*
 988          * we must release path, because we did not call
 989          * reiserfs_cut_from_item, or reiserfs_cut_from_item does not
 990          * release path if operation was not complete
 991          */
 992         pathrelse(&path);
 993         err = journal_end(&th);
 994         reiserfs_write_unlock(dir->i_sb);
 995         return err ? err : retval;
 996 }
 997
 998 static int reiserfs_unlink(struct inode *dir, struct dentry *dentry)
 999 {
1000         int retval, err;
1001         struct inode *inode;
1002         struct reiserfs_dir_entry de;
1003         INITIALIZE_PATH(path);
1004         struct reiserfs_transaction_handle th;
1005         int jbegin_count;
1006         unsigned long savelink;
1007
1008         retval = dquot_initialize(dir);
1009         if (retval)
1010                 return retval;
1011
1012         inode = d_inode(dentry);
1013
1014         /*
1015          * in this transaction we can be doing at max two balancings and
1016          * update two stat datas, we change quotas of the owner of the
1017          * directory and of the owner of the parent directory. The quota
1018          * structure is possibly deleted only on iput => outside of
1019          * this transaction
1020          */
1021         jbegin_count =
1022             JOURNAL_PER_BALANCE_CNT * 2 + 2 +
1023             4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
1024
1025         reiserfs_write_lock(dir->i_sb);
1026         retval = journal_begin(&th, dir->i_sb, jbegin_count);
1027         if (retval)
1028                 goto out_unlink;
1029
1030         de.de_gen_number_bit_string = NULL;
1031         if ((retval =
1032              reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
1033                                  &path, &de)) == NAME_NOT_FOUND) {
1034                 retval = -ENOENT;
1035                 goto end_unlink;
1036         } else if (retval == IO_ERROR) {
1037                 retval = -EIO;
1038                 goto end_unlink;
1039         }
1040
1041         reiserfs_update_inode_transaction(inode);
1042         reiserfs_update_inode_transaction(dir);
1043
1044         if (de.de_objectid != inode->i_ino) {
1045                 /*
1046                  * FIXME: compare key of an object and a key found in the entry
1047                  */
1048                 retval = -EIO;
1049                 goto end_unlink;
1050         }
1051
1052         if (!inode->i_nlink) {
1053                 reiserfs_warning(inode->i_sb, "reiserfs-7042",
1054                                  "deleting nonexistent file (%lu), %d",
1055                                  inode->i_ino, inode->i_nlink);
1056                 set_nlink(inode, 1);
1057         }
1058
1059         drop_nlink(inode);
1060
1061         /*
1062          * we schedule before doing the add_save_link call, save the link
1063          * count so we don't race
1064          */
1065         savelink = inode->i_nlink;
1066
1067         retval =
1068             reiserfs_cut_from_item(&th, &path, &de.de_entry_key, dir, NULL,
1069                                    0);
1070         if (retval < 0) {
1071                 inc_nlink(inode);
1072                 goto end_unlink;
1073         }
1074         inode_set_ctime_current(inode);
1075         reiserfs_update_sd(&th, inode);
1076
1077         dir->i_size -= (de.de_entrylen + DEH_SIZE);
1078         dir->i_mtime = inode_set_ctime_current(dir);
1079         reiserfs_update_sd(&th, dir);
1080
1081         if (!savelink)
1082                 /* prevent file from getting lost */
1083                 add_save_link(&th, inode, 0 /* not truncate */ );
1084
1085         retval = journal_end(&th);
1086         reiserfs_check_path(&path);
1087         reiserfs_write_unlock(dir->i_sb);
1088         return retval;
1089
1090 end_unlink:
1091         pathrelse(&path);
1092         err = journal_end(&th);
1093         reiserfs_check_path(&path);
1094         if (err)
1095                 retval = err;
1096 out_unlink:
1097         reiserfs_write_unlock(dir->i_sb);
1098         return retval;
1099 }
1100
1101 static int reiserfs_symlink(struct mnt_idmap *idmap,
1102                             struct inode *parent_dir, struct dentry *dentry,
1103                             const char *symname)
1104 {
1105         int retval;
1106         struct inode *inode;
1107         char *name;
1108         int item_len;
1109         struct reiserfs_transaction_handle th;
1110         struct reiserfs_security_handle security;
1111         int mode = S_IFLNK | S_IRWXUGO;
1112         /*
1113          * We need blocks for transaction + (user+group)*(quotas for
1114          * new inode + update of quota for directory owner)
1115          */
1116         int jbegin_count =
1117             JOURNAL_PER_BALANCE_CNT * 3 +
1118             2 * (REISERFS_QUOTA_INIT_BLOCKS(parent_dir->i_sb) +
1119                  REISERFS_QUOTA_TRANS_BLOCKS(parent_dir->i_sb));
1120
1121         retval = dquot_initialize(parent_dir);
1122         if (retval)
1123                 return retval;
1124
1125         if (!(inode = new_inode(parent_dir->i_sb))) {
1126                 return -ENOMEM;
1127         }
1128         retval = new_inode_init(inode, parent_dir, mode);
1129         if (retval) {
1130                 drop_new_inode(inode);
1131                 return retval;
1132         }
1133
1134         retval = reiserfs_security_init(parent_dir, inode, &dentry->d_name,
1135                                         &security);
1136         if (retval < 0) {
1137                 drop_new_inode(inode);
1138                 return retval;
1139         }
1140         jbegin_count += retval;
1141
1142         reiserfs_write_lock(parent_dir->i_sb);
1143         item_len = ROUND_UP(strlen(symname));
1144         if (item_len > MAX_DIRECT_ITEM_LEN(parent_dir->i_sb->s_blocksize)) {
1145                 retval = -ENAMETOOLONG;
1146                 drop_new_inode(inode);
1147                 goto out_failed;
1148         }
1149
1150         name = kmalloc(item_len, GFP_NOFS);
1151         if (!name) {
1152                 drop_new_inode(inode);
1153                 retval = -ENOMEM;
1154                 goto out_failed;
1155         }
1156         memcpy(name, symname, strlen(symname));
1157         padd_item(name, item_len, strlen(symname));
1158
1159         retval = journal_begin(&th, parent_dir->i_sb, jbegin_count);
1160         if (retval) {
1161                 drop_new_inode(inode);
1162                 kfree(name);
1163                 goto out_failed;
1164         }
1165
1166         retval =
1167             reiserfs_new_inode(&th, parent_dir, mode, name, strlen(symname),
1168                                dentry, inode, &security);
1169         kfree(name);
1170         if (retval) {           /* reiserfs_new_inode iputs for us */
1171                 goto out_failed;
1172         }
1173
1174         reiserfs_update_inode_transaction(inode);
1175         reiserfs_update_inode_transaction(parent_dir);
1176
1177         inode->i_op = &reiserfs_symlink_inode_operations;
1178         inode_nohighmem(inode);
1179         inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1180
1181         retval = reiserfs_add_entry(&th, parent_dir, dentry->d_name.name,
1182                                     dentry->d_name.len, inode, 1 /*visible */ );
1183         if (retval) {
1184                 int err;
1185                 drop_nlink(inode);
1186                 reiserfs_update_sd(&th, inode);
1187                 err = journal_end(&th);
1188                 if (err)
1189                         retval = err;
1190                 unlock_new_inode(inode);
1191                 iput(inode);
1192                 goto out_failed;
1193         }
1194
1195         d_instantiate_new(dentry, inode);
1196         retval = journal_end(&th);
1197 out_failed:
1198         reiserfs_write_unlock(parent_dir->i_sb);
1199         reiserfs_security_free(&security);
1200         return retval;
1201 }
1202
1203 static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
1204                          struct dentry *dentry)
1205 {
1206         int retval;
1207         struct inode *inode = d_inode(old_dentry);
1208         struct reiserfs_transaction_handle th;
1209         /*
1210          * We need blocks for transaction + update of quotas for
1211          * the owners of the directory
1212          */
1213         int jbegin_count =
1214             JOURNAL_PER_BALANCE_CNT * 3 +
1215             2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
1216
1217         retval = dquot_initialize(dir);
1218         if (retval)
1219                 return retval;
1220
1221         reiserfs_write_lock(dir->i_sb);
1222         if (inode->i_nlink >= REISERFS_LINK_MAX) {
1223                 /* FIXME: sd_nlink is 32 bit for new files */
1224                 reiserfs_write_unlock(dir->i_sb);
1225                 return -EMLINK;
1226         }
1227
1228         /* inc before scheduling so reiserfs_unlink knows we are here */
1229         inc_nlink(inode);
1230
1231         retval = journal_begin(&th, dir->i_sb, jbegin_count);
1232         if (retval) {
1233                 drop_nlink(inode);
1234                 reiserfs_write_unlock(dir->i_sb);
1235                 return retval;
1236         }
1237
1238         /* create new entry */
1239         retval =
1240             reiserfs_add_entry(&th, dir, dentry->d_name.name,
1241                                dentry->d_name.len, inode, 1 /*visible */ );
1242
1243         reiserfs_update_inode_transaction(inode);
1244         reiserfs_update_inode_transaction(dir);
1245
1246         if (retval) {
1247                 int err;
1248                 drop_nlink(inode);
1249                 err = journal_end(&th);
1250                 reiserfs_write_unlock(dir->i_sb);
1251                 return err ? err : retval;
1252         }
1253
1254         inode_set_ctime_current(inode);
1255         reiserfs_update_sd(&th, inode);
1256
1257         ihold(inode);
1258         d_instantiate(dentry, inode);
1259         retval = journal_end(&th);
1260         reiserfs_write_unlock(dir->i_sb);
1261         return retval;
1262 }
1263
1264 /* de contains information pointing to an entry which */
1265 static int de_still_valid(const char *name, int len,
1266                           struct reiserfs_dir_entry *de)
1267 {
1268         struct reiserfs_dir_entry tmp = *de;
1269
1270         /* recalculate pointer to name and name length */
1271         set_de_name_and_namelen(&tmp);
1272         /* FIXME: could check more */
1273         if (tmp.de_namelen != len || memcmp(name, de->de_name, len))
1274                 return 0;
1275         return 1;
1276 }
1277
1278 static int entry_points_to_object(const char *name, int len,
1279                                   struct reiserfs_dir_entry *de,
1280                                   struct inode *inode)
1281 {
1282         if (!de_still_valid(name, len, de))
1283                 return 0;
1284
1285         if (inode) {
1286                 if (!de_visible(de->de_deh + de->de_entry_num))
1287                         reiserfs_panic(inode->i_sb, "vs-7042",
1288                                        "entry must be visible");
1289                 return (de->de_objectid == inode->i_ino) ? 1 : 0;
1290         }
1291
1292         /* this must be added hidden entry */
1293         if (de_visible(de->de_deh + de->de_entry_num))
1294                 reiserfs_panic(NULL, "vs-7043", "entry must be visible");
1295
1296         return 1;
1297 }
1298
1299 /* sets key of objectid the entry has to point to */
1300 static void set_ino_in_dir_entry(struct reiserfs_dir_entry *de,
1301                                  struct reiserfs_key *key)
1302 {
1303         /* JDM These operations are endian safe - both are le */
1304         de->de_deh[de->de_entry_num].deh_dir_id = key->k_dir_id;
1305         de->de_deh[de->de_entry_num].deh_objectid = key->k_objectid;
1306 }
1307
1308 /*
1309  * process, that is going to call fix_nodes/do_balance must hold only
1310  * one path. If it holds 2 or more, it can get into endless waiting in
1311  * get_empty_nodes or its clones
1312  */
1313 static int reiserfs_rename(struct mnt_idmap *idmap,
1314                            struct inode *old_dir, struct dentry *old_dentry,
1315                            struct inode *new_dir, struct dentry *new_dentry,
1316                            unsigned int flags)
1317 {
1318         int retval;
1319         INITIALIZE_PATH(old_entry_path);
1320         INITIALIZE_PATH(new_entry_path);
1321         INITIALIZE_PATH(dot_dot_entry_path);
1322         struct item_head new_entry_ih, old_entry_ih, dot_dot_ih;
1323         struct reiserfs_dir_entry old_de, new_de, dot_dot_de;
1324         struct inode *old_inode, *new_dentry_inode;
1325         struct reiserfs_transaction_handle th;
1326         int jbegin_count;
1327         umode_t old_inode_mode;
1328         unsigned long savelink = 1;
1329
1330         if (flags & ~RENAME_NOREPLACE)
1331                 return -EINVAL;
1332
1333         /*
1334          * three balancings: (1) old name removal, (2) new name insertion
1335          * and (3) maybe "save" link insertion
1336          * stat data updates: (1) old directory,
1337          * (2) new directory and (3) maybe old object stat data (when it is
1338          * directory) and (4) maybe stat data of object to which new entry
1339          * pointed initially and (5) maybe block containing ".." of
1340          * renamed directory
1341          * quota updates: two parent directories
1342          */
1343         jbegin_count =
1344             JOURNAL_PER_BALANCE_CNT * 3 + 5 +
1345             4 * REISERFS_QUOTA_TRANS_BLOCKS(old_dir->i_sb);
1346
1347         retval = dquot_initialize(old_dir);
1348         if (retval)
1349                 return retval;
1350         retval = dquot_initialize(new_dir);
1351         if (retval)
1352                 return retval;
1353
1354         old_inode = d_inode(old_dentry);
1355         new_dentry_inode = d_inode(new_dentry);
1356
1357         /*
1358          * make sure that oldname still exists and points to an object we
1359          * are going to rename
1360          */
1361         old_de.de_gen_number_bit_string = NULL;
1362         reiserfs_write_lock(old_dir->i_sb);
1363         retval =
1364             reiserfs_find_entry(old_dir, old_dentry->d_name.name,
1365                                 old_dentry->d_name.len, &old_entry_path,
1366                                 &old_de);
1367         pathrelse(&old_entry_path);
1368         if (retval == IO_ERROR) {
1369                 reiserfs_write_unlock(old_dir->i_sb);
1370                 return -EIO;
1371         }
1372
1373         if (retval != NAME_FOUND || old_de.de_objectid != old_inode->i_ino) {
1374                 reiserfs_write_unlock(old_dir->i_sb);
1375                 return -ENOENT;
1376         }
1377
1378         old_inode_mode = old_inode->i_mode;
1379         if (S_ISDIR(old_inode_mode)) {
1380                 /*
1381                  * make sure that directory being renamed has correct ".."
1382                  * and that its new parent directory has not too many links
1383                  * already
1384                  */
1385                 if (new_dentry_inode) {
1386                         if (!reiserfs_empty_dir(new_dentry_inode)) {
1387                                 reiserfs_write_unlock(old_dir->i_sb);
1388                                 return -ENOTEMPTY;
1389                         }
1390                 }
1391
1392                 /*
1393                  * directory is renamed, its parent directory will be changed,
1394                  * so find ".." entry
1395                  */
1396                 dot_dot_de.de_gen_number_bit_string = NULL;
1397                 retval =
1398                     reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path,
1399                                         &dot_dot_de);
1400                 pathrelse(&dot_dot_entry_path);
1401                 if (retval != NAME_FOUND) {
1402                         reiserfs_write_unlock(old_dir->i_sb);
1403                         return -EIO;
1404                 }
1405
1406                 /* inode number of .. must equal old_dir->i_ino */
1407                 if (dot_dot_de.de_objectid != old_dir->i_ino) {
1408                         reiserfs_write_unlock(old_dir->i_sb);
1409                         return -EIO;
1410                 }
1411         }
1412
1413         retval = journal_begin(&th, old_dir->i_sb, jbegin_count);
1414         if (retval) {
1415                 reiserfs_write_unlock(old_dir->i_sb);
1416                 return retval;
1417         }
1418
1419         /* add new entry (or find the existing one) */
1420         retval =
1421             reiserfs_add_entry(&th, new_dir, new_dentry->d_name.name,
1422                                new_dentry->d_name.len, old_inode, 0);
1423         if (retval == -EEXIST) {
1424                 if (!new_dentry_inode) {
1425                         reiserfs_panic(old_dir->i_sb, "vs-7050",
1426                                        "new entry is found, new inode == 0");
1427                 }
1428         } else if (retval) {
1429                 int err = journal_end(&th);
1430                 reiserfs_write_unlock(old_dir->i_sb);
1431                 return err ? err : retval;
1432         }
1433
1434         reiserfs_update_inode_transaction(old_dir);
1435         reiserfs_update_inode_transaction(new_dir);
1436
1437         /*
1438          * this makes it so an fsync on an open fd for the old name will
1439          * commit the rename operation
1440          */
1441         reiserfs_update_inode_transaction(old_inode);
1442
1443         if (new_dentry_inode)
1444                 reiserfs_update_inode_transaction(new_dentry_inode);
1445
1446         while (1) {
1447                 /*
1448                  * look for old name using corresponding entry key
1449                  * (found by reiserfs_find_entry)
1450                  */
1451                 if ((retval =
1452                      search_by_entry_key(new_dir->i_sb, &old_de.de_entry_key,
1453                                          &old_entry_path,
1454                                          &old_de)) != NAME_FOUND) {
1455                         pathrelse(&old_entry_path);
1456                         journal_end(&th);
1457                         reiserfs_write_unlock(old_dir->i_sb);
1458                         return -EIO;
1459                 }
1460
1461                 copy_item_head(&old_entry_ih, tp_item_head(&old_entry_path));
1462
1463                 reiserfs_prepare_for_journal(old_inode->i_sb, old_de.de_bh, 1);
1464
1465                 /* look for new name by reiserfs_find_entry */
1466                 new_de.de_gen_number_bit_string = NULL;
1467                 retval =
1468                     reiserfs_find_entry(new_dir, new_dentry->d_name.name,
1469                                         new_dentry->d_name.len, &new_entry_path,
1470                                         &new_de);
1471                 /*
1472                  * reiserfs_add_entry should not return IO_ERROR,
1473                  * because it is called with essentially same parameters from
1474                  * reiserfs_add_entry above, and we'll catch any i/o errors
1475                  * before we get here.
1476                  */
1477                 if (retval != NAME_FOUND_INVISIBLE && retval != NAME_FOUND) {
1478                         pathrelse(&new_entry_path);
1479                         pathrelse(&old_entry_path);
1480                         journal_end(&th);
1481                         reiserfs_write_unlock(old_dir->i_sb);
1482                         return -EIO;
1483                 }
1484
1485                 copy_item_head(&new_entry_ih, tp_item_head(&new_entry_path));
1486
1487                 reiserfs_prepare_for_journal(old_inode->i_sb, new_de.de_bh, 1);
1488
1489                 if (S_ISDIR(old_inode->i_mode)) {
1490                         if ((retval =
1491                              search_by_entry_key(new_dir->i_sb,
1492                                                  &dot_dot_de.de_entry_key,
1493                                                  &dot_dot_entry_path,
1494                                                  &dot_dot_de)) != NAME_FOUND) {
1495                                 pathrelse(&dot_dot_entry_path);
1496                                 pathrelse(&new_entry_path);
1497                                 pathrelse(&old_entry_path);
1498                                 journal_end(&th);
1499                                 reiserfs_write_unlock(old_dir->i_sb);
1500                                 return -EIO;
1501                         }
1502                         copy_item_head(&dot_dot_ih,
1503                                        tp_item_head(&dot_dot_entry_path));
1504                         /* node containing ".." gets into transaction */
1505                         reiserfs_prepare_for_journal(old_inode->i_sb,
1506                                                      dot_dot_de.de_bh, 1);
1507                 }
1508                 /*
1509                  * we should check seals here, not do
1510                  * this stuff, yes? Then, having
1511                  * gathered everything into RAM we
1512                  * should lock the buffers, yes?  -Hans
1513                  */
1514                 /*
1515                  * probably.  our rename needs to hold more
1516                  * than one path at once.  The seals would
1517                  * have to be written to deal with multi-path
1518                  * issues -chris
1519                  */
1520                 /*
1521                  * sanity checking before doing the rename - avoid races many
1522                  * of the above checks could have scheduled.  We have to be
1523                  * sure our items haven't been shifted by another process.
1524                  */
1525                 if (item_moved(&new_entry_ih, &new_entry_path) ||
1526                     !entry_points_to_object(new_dentry->d_name.name,
1527                                             new_dentry->d_name.len,
1528                                             &new_de, new_dentry_inode) ||
1529                     item_moved(&old_entry_ih, &old_entry_path) ||
1530                     !entry_points_to_object(old_dentry->d_name.name,
1531                                             old_dentry->d_name.len,
1532                                             &old_de, old_inode)) {
1533                         reiserfs_restore_prepared_buffer(old_inode->i_sb,
1534                                                          new_de.de_bh);
1535                         reiserfs_restore_prepared_buffer(old_inode->i_sb,
1536                                                          old_de.de_bh);
1537                         if (S_ISDIR(old_inode_mode))
1538                                 reiserfs_restore_prepared_buffer(old_inode->
1539                                                                  i_sb,
1540                                                                  dot_dot_de.
1541                                                                  de_bh);
1542                         continue;
1543                 }
1544                 if (S_ISDIR(old_inode_mode)) {
1545                         if (item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
1546                             !entry_points_to_object("..", 2, &dot_dot_de,
1547                                                     old_dir)) {
1548                                 reiserfs_restore_prepared_buffer(old_inode->
1549                                                                  i_sb,
1550                                                                  old_de.de_bh);
1551                                 reiserfs_restore_prepared_buffer(old_inode->
1552                                                                  i_sb,
1553                                                                  new_de.de_bh);
1554                                 reiserfs_restore_prepared_buffer(old_inode->
1555                                                                  i_sb,
1556                                                                  dot_dot_de.
1557                                                                  de_bh);
1558                                 continue;
1559                         }
1560                 }
1561
1562                 RFALSE(S_ISDIR(old_inode_mode) &&
1563                        !buffer_journal_prepared(dot_dot_de.de_bh), "");
1564
1565                 break;
1566         }
1567
1568         /*
1569          * ok, all the changes can be done in one fell swoop when we
1570          * have claimed all the buffers needed.
1571          */
1572
1573         mark_de_visible(new_de.de_deh + new_de.de_entry_num);
1574         set_ino_in_dir_entry(&new_de, INODE_PKEY(old_inode));
1575         journal_mark_dirty(&th, new_de.de_bh);
1576
1577         mark_de_hidden(old_de.de_deh + old_de.de_entry_num);
1578         journal_mark_dirty(&th, old_de.de_bh);
1579         /*
1580          * thanks to Alex Adriaanse <alex_a@caltech.edu> for patch
1581          * which adds ctime update of renamed object
1582          */
1583         simple_rename_timestamp(old_dir, old_dentry, new_dir, new_dentry);
1584
1585         if (new_dentry_inode) {
1586                 /* adjust link number of the victim */
1587                 if (S_ISDIR(new_dentry_inode->i_mode)) {
1588                         clear_nlink(new_dentry_inode);
1589                 } else {
1590                         drop_nlink(new_dentry_inode);
1591                 }
1592                 savelink = new_dentry_inode->i_nlink;
1593         }
1594
1595         if (S_ISDIR(old_inode_mode)) {
1596                 /* adjust ".." of renamed directory */
1597                 set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir));
1598                 journal_mark_dirty(&th, dot_dot_de.de_bh);
1599
1600                 /*
1601                  * there (in new_dir) was no directory, so it got new link
1602                  * (".."  of renamed directory)
1603                  */
1604                 if (!new_dentry_inode)
1605                         INC_DIR_INODE_NLINK(new_dir);
1606
1607                 /* old directory lost one link - ".. " of renamed directory */
1608                 DEC_DIR_INODE_NLINK(old_dir);
1609         }
1610         /*
1611          * looks like in 2.3.99pre3 brelse is atomic.
1612          * so we can use pathrelse
1613          */
1614         pathrelse(&new_entry_path);
1615         pathrelse(&dot_dot_entry_path);
1616
1617         /*
1618          * FIXME: this reiserfs_cut_from_item's return value may screw up
1619          * anybody, but it will panic if will not be able to find the
1620          * entry. This needs one more clean up
1621          */
1622         if (reiserfs_cut_from_item
1623             (&th, &old_entry_path, &old_de.de_entry_key, old_dir, NULL,
1624              0) < 0)
1625                 reiserfs_error(old_dir->i_sb, "vs-7060",
1626                                "couldn't not cut old name. Fsck later?");
1627
1628         old_dir->i_size -= DEH_SIZE + old_de.de_entrylen;
1629
1630         reiserfs_update_sd(&th, old_dir);
1631         reiserfs_update_sd(&th, new_dir);
1632         reiserfs_update_sd(&th, old_inode);
1633
1634         if (new_dentry_inode) {
1635                 if (savelink == 0)
1636                         add_save_link(&th, new_dentry_inode,
1637                                       0 /* not truncate */ );
1638                 reiserfs_update_sd(&th, new_dentry_inode);
1639         }
1640
1641         retval = journal_end(&th);
1642         reiserfs_write_unlock(old_dir->i_sb);
1643         return retval;
1644 }
1645
1646 static const struct inode_operations reiserfs_priv_dir_inode_operations = {
1647         .create = reiserfs_create,
1648         .lookup = reiserfs_lookup,
1649         .link = reiserfs_link,
1650         .unlink = reiserfs_unlink,
1651         .symlink = reiserfs_symlink,
1652         .mkdir = reiserfs_mkdir,
1653         .rmdir = reiserfs_rmdir,
1654         .mknod = reiserfs_mknod,
1655         .rename = reiserfs_rename,
1656         .setattr = reiserfs_setattr,
1657         .permission = reiserfs_permission,
1658         .fileattr_get = reiserfs_fileattr_get,
1659         .fileattr_set = reiserfs_fileattr_set,
1660 };
1661
1662 static const struct inode_operations reiserfs_priv_symlink_inode_operations = {
1663         .get_link       = page_get_link,
1664         .setattr = reiserfs_setattr,
1665         .permission = reiserfs_permission,
1666 };
1667
1668 static const struct inode_operations reiserfs_priv_special_inode_operations = {
1669         .setattr = reiserfs_setattr,
1670         .permission = reiserfs_permission,
1671 };
1672
1673 void reiserfs_init_priv_inode(struct inode *inode)
1674 {
1675         inode->i_flags |= S_PRIVATE;
1676         inode->i_opflags &= ~IOP_XATTR;
1677
1678         if (S_ISREG(inode->i_mode))
1679                 inode->i_op = &reiserfs_priv_file_inode_operations;
1680         else if (S_ISDIR(inode->i_mode))
1681                 inode->i_op = &reiserfs_priv_dir_inode_operations;
1682         else if (S_ISLNK(inode->i_mode))
1683                 inode->i_op = &reiserfs_priv_symlink_inode_operations;
1684         else
1685                 inode->i_op = &reiserfs_priv_special_inode_operations;
1686 }
1687
1688 /* directories can handle most operations...  */
1689 const struct inode_operations reiserfs_dir_inode_operations = {
1690         .create = reiserfs_create,
1691         .lookup = reiserfs_lookup,
1692         .link = reiserfs_link,
1693         .unlink = reiserfs_unlink,
1694         .symlink = reiserfs_symlink,
1695         .mkdir = reiserfs_mkdir,
1696         .rmdir = reiserfs_rmdir,
1697         .mknod = reiserfs_mknod,
1698         .rename = reiserfs_rename,
1699         .setattr = reiserfs_setattr,
1700         .listxattr = reiserfs_listxattr,
1701         .permission = reiserfs_permission,
1702         .get_inode_acl = reiserfs_get_acl,
1703         .set_acl = reiserfs_set_acl,
1704         .fileattr_get = reiserfs_fileattr_get,
1705         .fileattr_set = reiserfs_fileattr_set,
1706 };
1707
1708 /*
1709  * symlink operations.. same as page_symlink_inode_operations, with xattr
1710  * stuff added
1711  */
1712 const struct inode_operations reiserfs_symlink_inode_operations = {
1713         .get_link       = page_get_link,
1714         .setattr = reiserfs_setattr,
1715         .listxattr = reiserfs_listxattr,
1716         .permission = reiserfs_permission,
1717 };
1718
1719 /*
1720  * special file operations.. just xattr/acl stuff
1721  */
1722 const struct inode_operations reiserfs_special_inode_operations = {
1723         .setattr = reiserfs_setattr,
1724         .listxattr = reiserfs_listxattr,
1725         .permission = reiserfs_permission,
1726         .get_inode_acl = reiserfs_get_acl,
1727         .set_acl = reiserfs_set_acl,
1728 };