fs/reiserfs/namei.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
bin_search_in_dir_item
set_de_item_location
set_de_name_and_namelen
set_de_object_key
store_de_entry_key
search_by_entry_key
get_third_component
reiserfs_match
linear_search_in_dir_item
reiserfs_find_entry
reiserfs_lookup
reiserfs_get_parent
reiserfs_add_entry
drop_new_inode
new_inode_init
reiserfs_create
reiserfs_mknod
reiserfs_mkdir
reiserfs_empty_dir
reiserfs_rmdir
reiserfs_unlink
reiserfs_symlink
reiserfs_link
de_still_valid
entry_points_to_object
set_ino_in_dir_entry
reiserfs_rename
   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 
 136         case ITEM_FOUND:
 137                 break;
 138 
 139         case IO_ERROR:
 140                 return retval;
 141 
 142         default:
 143                 pathrelse(path);
 144                 reiserfs_error(sb, "vs-7002", "no path to here");
 145                 return IO_ERROR;
 146         }
 147 
 148         set_de_item_location(de, path);
 149 
 150 #ifdef CONFIG_REISERFS_CHECK
 151         if (!is_direntry_le_ih(de->de_ih) ||
 152             COMP_SHORT_KEYS(&de->de_ih->ih_key, key)) {
 153                 print_block(de->de_bh, 0, -1, -1);
 154                 reiserfs_panic(sb, "vs-7005", "found item %h is not directory "
 155                                "item or does not belong to the same directory "
 156                                "as key %K", de->de_ih, key);
 157         }
 158 #endif                          /* CONFIG_REISERFS_CHECK */
 159 
 160         /*
 161          * binary search in directory item by third component of the
 162          * key. sets de->de_entry_num of de
 163          */
 164         retval = bin_search_in_dir_item(de, cpu_key_k_offset(key));
 165         path->pos_in_item = de->de_entry_num;
 166         if (retval != NAME_NOT_FOUND) {
 167                 /*
 168                  * ugly, but rename needs de_bh, de_deh, de_name,
 169                  * de_namelen, de_objectid set
 170                  */
 171                 set_de_name_and_namelen(de);
 172                 set_de_object_key(de);
 173         }
 174         return retval;
 175 }
 176 
 177 /* Keyed 32-bit hash function using TEA in a Davis-Meyer function */
 178 
 179 /*
 180  * The third component is hashed, and you can choose from more than
 181  * one hash function.  Per directory hashes are not yet implemented
 182  * but are thought about. This function should be moved to hashes.c
 183  * Jedi, please do so.  -Hans
 184  */
 185 static __u32 get_third_component(struct super_block *s,
 186                                  const char *name, int len)
 187 {
 188         __u32 res;
 189 
 190         if (!len || (len == 1 && name[0] == '.'))
 191                 return DOT_OFFSET;
 192         if (len == 2 && name[0] == '.' && name[1] == '.')
 193                 return DOT_DOT_OFFSET;
 194 
 195         res = REISERFS_SB(s)->s_hash_function(name, len);
 196 
 197         /* take bits from 7-th to 30-th including both bounds */
 198         res = GET_HASH_VALUE(res);
 199         if (res == 0)
 200                 /*
 201                  * needed to have no names before "." and ".." those have hash
 202                  * value == 0 and generation conters 1 and 2 accordingly
 203                  */
 204                 res = 128;
 205         return res + MAX_GENERATION_NUMBER;
 206 }
 207 
 208 static int reiserfs_match(struct reiserfs_dir_entry *de,
 209                           const char *name, int namelen)
 210 {
 211         int retval = NAME_NOT_FOUND;
 212 
 213         if ((namelen == de->de_namelen) &&
 214             !memcmp(de->de_name, name, de->de_namelen))
 215                 retval =
 216                     (de_visible(de->de_deh + de->de_entry_num) ? NAME_FOUND :
 217                      NAME_FOUND_INVISIBLE);
 218 
 219         return retval;
 220 }
 221 
 222 /* de's de_bh, de_ih, de_deh, de_item_num, de_entry_num are set already */
 223 
 224 /* used when hash collisions exist */
 225 
 226 static int linear_search_in_dir_item(struct cpu_key *key,
 227                                      struct reiserfs_dir_entry *de,
 228                                      const char *name, int namelen)
 229 {
 230         struct reiserfs_de_head *deh = de->de_deh;
 231         int retval;
 232         int i;
 233 
 234         i = de->de_entry_num;
 235 
 236         if (i == ih_entry_count(de->de_ih) ||
 237             GET_HASH_VALUE(deh_offset(deh + i)) !=
 238             GET_HASH_VALUE(cpu_key_k_offset(key))) {
 239                 i--;
 240         }
 241 
 242         RFALSE(de->de_deh != B_I_DEH(de->de_bh, de->de_ih),
 243                "vs-7010: array of entry headers not found");
 244 
 245         deh += i;
 246 
 247         for (; i >= 0; i--, deh--) {
 248                 /* hash value does not match, no need to check whole name */
 249                 if (GET_HASH_VALUE(deh_offset(deh)) !=
 250                     GET_HASH_VALUE(cpu_key_k_offset(key))) {
 251                         return NAME_NOT_FOUND;
 252                 }
 253 
 254                 /* mark that this generation number is used */
 255                 if (de->de_gen_number_bit_string)
 256                         set_bit(GET_GENERATION_NUMBER(deh_offset(deh)),
 257                                 de->de_gen_number_bit_string);
 258 
 259                 /* calculate pointer to name and namelen */
 260                 de->de_entry_num = i;
 261                 set_de_name_and_namelen(de);
 262 
 263                 /*
 264                  * de's de_name, de_namelen, de_recordlen are set.
 265                  * Fill the rest.
 266                  */
 267                 if ((retval =
 268                      reiserfs_match(de, name, namelen)) != NAME_NOT_FOUND) {
 269 
 270                         /* key of pointed object */
 271                         set_de_object_key(de);
 272 
 273                         store_de_entry_key(de);
 274 
 275                         /* retval can be NAME_FOUND or NAME_FOUND_INVISIBLE */
 276                         return retval;
 277                 }
 278         }
 279 
 280         if (GET_GENERATION_NUMBER(le_ih_k_offset(de->de_ih)) == 0)
 281                 /*
 282                  * we have reached left most entry in the node. In common we
 283                  * have to go to the left neighbor, but if generation counter
 284                  * is 0 already, we know for sure, that there is no name with
 285                  * the same hash value
 286                  */
 287                 /*
 288                  * FIXME: this work correctly only because hash value can not
 289                  *  be 0. Btw, in case of Yura's hash it is probably possible,
 290                  * so, this is a bug
 291                  */
 292                 return NAME_NOT_FOUND;
 293 
 294         RFALSE(de->de_item_num,
 295                "vs-7015: two diritems of the same directory in one node?");
 296 
 297         return GOTO_PREVIOUS_ITEM;
 298 }
 299 
 300 /*
 301  * may return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND
 302  * FIXME: should add something like IOERROR
 303  */
 304 static int reiserfs_find_entry(struct inode *dir, const char *name, int namelen,
 305                                struct treepath *path_to_entry,
 306                                struct reiserfs_dir_entry *de)
 307 {
 308         struct cpu_key key_to_search;
 309         int retval;
 310 
 311         if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
 312                 return NAME_NOT_FOUND;
 313 
 314         /* we will search for this key in the tree */
 315         make_cpu_key(&key_to_search, dir,
 316                      get_third_component(dir->i_sb, name, namelen),
 317                      TYPE_DIRENTRY, 3);
 318 
 319         while (1) {
 320                 retval =
 321                     search_by_entry_key(dir->i_sb, &key_to_search,
 322                                         path_to_entry, de);
 323                 if (retval == IO_ERROR) {
 324                         reiserfs_error(dir->i_sb, "zam-7001", "io error");
 325                         return IO_ERROR;
 326                 }
 327 
 328                 /* compare names for all entries having given hash value */
 329                 retval =
 330                     linear_search_in_dir_item(&key_to_search, de, name,
 331                                               namelen);
 332                 /*
 333                  * there is no need to scan directory anymore.
 334                  * Given entry found or does not exist
 335                  */
 336                 if (retval != GOTO_PREVIOUS_ITEM) {
 337                         path_to_entry->pos_in_item = de->de_entry_num;
 338                         return retval;
 339                 }
 340 
 341                 /*
 342                  * there is left neighboring item of this directory
 343                  * and given entry can be there
 344                  */
 345                 set_cpu_key_k_offset(&key_to_search,
 346                                      le_ih_k_offset(de->de_ih) - 1);
 347                 pathrelse(path_to_entry);
 348 
 349         }                       /* while (1) */
 350 }
 351 
 352 static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
 353                                       unsigned int flags)
 354 {
 355         int retval;
 356         struct inode *inode = NULL;
 357         struct reiserfs_dir_entry de;
 358         INITIALIZE_PATH(path_to_entry);
 359 
 360         if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
 361                 return ERR_PTR(-ENAMETOOLONG);
 362 
 363         reiserfs_write_lock(dir->i_sb);
 364 
 365         de.de_gen_number_bit_string = NULL;
 366         retval =
 367             reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
 368                                 &path_to_entry, &de);
 369         pathrelse(&path_to_entry);
 370         if (retval == NAME_FOUND) {
 371                 inode = reiserfs_iget(dir->i_sb,
 372                                       (struct cpu_key *)&de.de_dir_id);
 373                 if (!inode || IS_ERR(inode)) {
 374                         reiserfs_write_unlock(dir->i_sb);
 375                         return ERR_PTR(-EACCES);
 376                 }
 377 
 378                 /*
 379                  * Propagate the private flag so we know we're
 380                  * in the priv tree.  Also clear IOP_XATTR
 381                  * since we don't have xattrs on xattr files.
 382                  */
 383                 if (IS_PRIVATE(dir)) {
 384                         inode->i_flags |= S_PRIVATE;
 385                         inode->i_opflags &= ~IOP_XATTR;
 386                 }
 387         }
 388         reiserfs_write_unlock(dir->i_sb);
 389         if (retval == IO_ERROR) {
 390                 return ERR_PTR(-EIO);
 391         }
 392 
 393         return d_splice_alias(inode, dentry);
 394 }
 395 
 396 /*
 397  * looks up the dentry of the parent directory for child.
 398  * taken from ext2_get_parent
 399  */
 400 struct dentry *reiserfs_get_parent(struct dentry *child)
 401 {
 402         int retval;
 403         struct inode *inode = NULL;
 404         struct reiserfs_dir_entry de;
 405         INITIALIZE_PATH(path_to_entry);
 406         struct inode *dir = d_inode(child);
 407 
 408         if (dir->i_nlink == 0) {
 409                 return ERR_PTR(-ENOENT);
 410         }
 411         de.de_gen_number_bit_string = NULL;
 412 
 413         reiserfs_write_lock(dir->i_sb);
 414         retval = reiserfs_find_entry(dir, "..", 2, &path_to_entry, &de);
 415         pathrelse(&path_to_entry);
 416         if (retval != NAME_FOUND) {
 417                 reiserfs_write_unlock(dir->i_sb);
 418                 return ERR_PTR(-ENOENT);
 419         }
 420         inode = reiserfs_iget(dir->i_sb, (struct cpu_key *)&de.de_dir_id);
 421         reiserfs_write_unlock(dir->i_sb);
 422 
 423         return d_obtain_alias(inode);
 424 }
 425 
 426 /* add entry to the directory (entry can be hidden).
 427 
 428 insert definition of when hidden directories are used here -Hans
 429 
 430  Does not mark dir   inode dirty, do it after successesfull call to it */
 431 
 432 static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
 433                               struct inode *dir, const char *name, int namelen,
 434                               struct inode *inode, int visible)
 435 {
 436         struct cpu_key entry_key;
 437         struct reiserfs_de_head *deh;
 438         INITIALIZE_PATH(path);
 439         struct reiserfs_dir_entry de;
 440         DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1);
 441         int gen_number;
 442 
 443         /*
 444          * 48 bytes now and we avoid kmalloc if we
 445          * create file with short name
 446          */
 447         char small_buf[32 + DEH_SIZE];
 448 
 449         char *buffer;
 450         int buflen, paste_size;
 451         int retval;
 452 
 453         BUG_ON(!th->t_trans_id);
 454 
 455         /* cannot allow items to be added into a busy deleted directory */
 456         if (!namelen)
 457                 return -EINVAL;
 458 
 459         if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
 460                 return -ENAMETOOLONG;
 461 
 462         /* each entry has unique key. compose it */
 463         make_cpu_key(&entry_key, dir,
 464                      get_third_component(dir->i_sb, name, namelen),
 465                      TYPE_DIRENTRY, 3);
 466 
 467         /* get memory for composing the entry */
 468         buflen = DEH_SIZE + ROUND_UP(namelen);
 469         if (buflen > sizeof(small_buf)) {
 470                 buffer = kmalloc(buflen, GFP_NOFS);
 471                 if (!buffer)
 472                         return -ENOMEM;
 473         } else
 474                 buffer = small_buf;
 475 
 476         paste_size =
 477             (get_inode_sd_version(dir) ==
 478              STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen;
 479 
 480         /*
 481          * fill buffer : directory entry head, name[, dir objectid | ,
 482          * stat data | ,stat data, dir objectid ]
 483          */
 484         deh = (struct reiserfs_de_head *)buffer;
 485         deh->deh_location = 0;  /* JDM Endian safe if 0 */
 486         put_deh_offset(deh, cpu_key_k_offset(&entry_key));
 487         deh->deh_state = 0;     /* JDM Endian safe if 0 */
 488         /* put key (ino analog) to de */
 489 
 490         /* safe: k_dir_id is le */
 491         deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id;
 492         /* safe: k_objectid is le */
 493         deh->deh_objectid = INODE_PKEY(inode)->k_objectid;
 494 
 495         /* copy name */
 496         memcpy((char *)(deh + 1), name, namelen);
 497         /* padd by 0s to the 4 byte boundary */
 498         padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen);
 499 
 500         /*
 501          * entry is ready to be pasted into tree, set 'visibility'
 502          * and 'stat data in entry' attributes
 503          */
 504         mark_de_without_sd(deh);
 505         visible ? mark_de_visible(deh) : mark_de_hidden(deh);
 506 
 507         /* find the proper place for the new entry */
 508         memset(bit_string, 0, sizeof(bit_string));
 509         de.de_gen_number_bit_string = bit_string;
 510         retval = reiserfs_find_entry(dir, name, namelen, &path, &de);
 511         if (retval != NAME_NOT_FOUND) {
 512                 if (buffer != small_buf)
 513                         kfree(buffer);
 514                 pathrelse(&path);
 515 
 516                 if (retval == IO_ERROR) {
 517                         return -EIO;
 518                 }
 519 
 520                 if (retval != NAME_FOUND) {
 521                         reiserfs_error(dir->i_sb, "zam-7002",
 522                                        "reiserfs_find_entry() returned "
 523                                        "unexpected value (%d)", retval);
 524                 }
 525 
 526                 return -EEXIST;
 527         }
 528 
 529         gen_number =
 530             find_first_zero_bit(bit_string,
 531                                 MAX_GENERATION_NUMBER + 1);
 532         if (gen_number > MAX_GENERATION_NUMBER) {
 533                 /* there is no free generation number */
 534                 reiserfs_warning(dir->i_sb, "reiserfs-7010",
 535                                  "Congratulations! we have got hash function "
 536                                  "screwed up");
 537                 if (buffer != small_buf)
 538                         kfree(buffer);
 539                 pathrelse(&path);
 540                 return -EBUSY;
 541         }
 542         /* adjust offset of directory enrty */
 543         put_deh_offset(deh, SET_GENERATION_NUMBER(deh_offset(deh), gen_number));
 544         set_cpu_key_k_offset(&entry_key, deh_offset(deh));
 545 
 546         /* update max-hash-collisions counter in reiserfs_sb_info */
 547         PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number);
 548 
 549         /* we need to re-search for the insertion point */
 550         if (gen_number != 0) {
 551                 if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) !=
 552                     NAME_NOT_FOUND) {
 553                         reiserfs_warning(dir->i_sb, "vs-7032",
 554                                          "entry with this key (%K) already "
 555                                          "exists", &entry_key);
 556 
 557                         if (buffer != small_buf)
 558                                 kfree(buffer);
 559                         pathrelse(&path);
 560                         return -EBUSY;
 561                 }
 562         }
 563 
 564         /* perform the insertion of the entry that we have prepared */
 565         retval =
 566             reiserfs_paste_into_item(th, &path, &entry_key, dir, buffer,
 567                                      paste_size);
 568         if (buffer != small_buf)
 569                 kfree(buffer);
 570         if (retval) {
 571                 reiserfs_check_path(&path);
 572                 return retval;
 573         }
 574 
 575         dir->i_size += paste_size;
 576         dir->i_mtime = dir->i_ctime = current_time(dir);
 577         if (!S_ISDIR(inode->i_mode) && visible)
 578                 /* reiserfs_mkdir or reiserfs_rename will do that by itself */
 579                 reiserfs_update_sd(th, dir);
 580 
 581         reiserfs_check_path(&path);
 582         return 0;
 583 }
 584 
 585 /*
 586  * quota utility function, call if you've had to abort after calling
 587  * new_inode_init, and have not called reiserfs_new_inode yet.
 588  * This should only be called on inodes that do not have stat data
 589  * inserted into the tree yet.
 590  */
 591 static int drop_new_inode(struct inode *inode)
 592 {
 593         dquot_drop(inode);
 594         make_bad_inode(inode);
 595         inode->i_flags |= S_NOQUOTA;
 596         iput(inode);
 597         return 0;
 598 }
 599 
 600 /*
 601  * utility function that does setup for reiserfs_new_inode.
 602  * dquot_initialize needs lots of credits so it's better to have it
 603  * outside of a transaction, so we had to pull some bits of
 604  * reiserfs_new_inode out into this func.
 605  */
 606 static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode)
 607 {
 608         /*
 609          * Make inode invalid - just in case we are going to drop it before
 610          * the initialization happens
 611          */
 612         INODE_PKEY(inode)->k_objectid = 0;
 613 
 614         /*
 615          * the quota init calls have to know who to charge the quota to, so
 616          * we have to set uid and gid here
 617          */
 618         inode_init_owner(inode, dir, mode);
 619         return dquot_initialize(inode);
 620 }
 621 
 622 static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 623                            bool excl)
 624 {
 625         int retval;
 626         struct inode *inode;
 627         /*
 628          * We need blocks for transaction + (user+group)*(quotas
 629          * for new inode + update of quota for directory owner)
 630          */
 631         int jbegin_count =
 632             JOURNAL_PER_BALANCE_CNT * 2 +
 633             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
 634                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
 635         struct reiserfs_transaction_handle th;
 636         struct reiserfs_security_handle security;
 637 
 638         retval = dquot_initialize(dir);
 639         if (retval)
 640                 return retval;
 641 
 642         if (!(inode = new_inode(dir->i_sb))) {
 643                 return -ENOMEM;
 644         }
 645         retval = new_inode_init(inode, dir, mode);
 646         if (retval) {
 647                 drop_new_inode(inode);
 648                 return retval;
 649         }
 650 
 651         jbegin_count += reiserfs_cache_default_acl(dir);
 652         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
 653         if (retval < 0) {
 654                 drop_new_inode(inode);
 655                 return retval;
 656         }
 657         jbegin_count += retval;
 658         reiserfs_write_lock(dir->i_sb);
 659 
 660         retval = journal_begin(&th, dir->i_sb, jbegin_count);
 661         if (retval) {
 662                 drop_new_inode(inode);
 663                 goto out_failed;
 664         }
 665 
 666         retval =
 667             reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
 668                                inode, &security);
 669         if (retval)
 670                 goto out_failed;
 671 
 672         inode->i_op = &reiserfs_file_inode_operations;
 673         inode->i_fop = &reiserfs_file_operations;
 674         inode->i_mapping->a_ops = &reiserfs_address_space_operations;
 675 
 676         retval =
 677             reiserfs_add_entry(&th, dir, dentry->d_name.name,
 678                                dentry->d_name.len, inode, 1 /*visible */ );
 679         if (retval) {
 680                 int err;
 681                 drop_nlink(inode);
 682                 reiserfs_update_sd(&th, inode);
 683                 err = journal_end(&th);
 684                 if (err)
 685                         retval = err;
 686                 unlock_new_inode(inode);
 687                 iput(inode);
 688                 goto out_failed;
 689         }
 690         reiserfs_update_inode_transaction(inode);
 691         reiserfs_update_inode_transaction(dir);
 692 
 693         d_instantiate_new(dentry, inode);
 694         retval = journal_end(&th);
 695 
 696 out_failed:
 697         reiserfs_write_unlock(dir->i_sb);
 698         return retval;
 699 }
 700 
 701 static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
 702                           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         return retval;
 782 }
 783 
 784 static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 785 {
 786         int retval;
 787         struct inode *inode;
 788         struct reiserfs_transaction_handle th;
 789         struct reiserfs_security_handle security;
 790         /*
 791          * We need blocks for transaction + (user+group)*(quotas
 792          * for new inode + update of quota for directory owner)
 793          */
 794         int jbegin_count =
 795             JOURNAL_PER_BALANCE_CNT * 3 +
 796             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
 797                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
 798 
 799         retval = dquot_initialize(dir);
 800         if (retval)
 801                 return retval;
 802 
 803 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
 804         /*
 805          * set flag that new packing locality created and new blocks
 806          * for the content of that directory are not displaced yet
 807          */
 808         REISERFS_I(dir)->new_packing_locality = 1;
 809 #endif
 810         mode = S_IFDIR | mode;
 811         if (!(inode = new_inode(dir->i_sb))) {
 812                 return -ENOMEM;
 813         }
 814         retval = new_inode_init(inode, dir, mode);
 815         if (retval) {
 816                 drop_new_inode(inode);
 817                 return retval;
 818         }
 819 
 820         jbegin_count += reiserfs_cache_default_acl(dir);
 821         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
 822         if (retval < 0) {
 823                 drop_new_inode(inode);
 824                 return retval;
 825         }
 826         jbegin_count += retval;
 827         reiserfs_write_lock(dir->i_sb);
 828 
 829         retval = journal_begin(&th, dir->i_sb, jbegin_count);
 830         if (retval) {
 831                 drop_new_inode(inode);
 832                 goto out_failed;
 833         }
 834 
 835         /*
 836          * inc the link count now, so another writer doesn't overflow
 837          * it while we sleep later on.
 838          */
 839         INC_DIR_INODE_NLINK(dir)
 840 
 841             retval = reiserfs_new_inode(&th, dir, mode, NULL /*symlink */ ,
 842                                         old_format_only(dir->i_sb) ?
 843                                         EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
 844                                         dentry, inode, &security);
 845         if (retval) {
 846                 DEC_DIR_INODE_NLINK(dir)
 847                 goto out_failed;
 848         }
 849 
 850         reiserfs_update_inode_transaction(inode);
 851         reiserfs_update_inode_transaction(dir);
 852 
 853         inode->i_op = &reiserfs_dir_inode_operations;
 854         inode->i_fop = &reiserfs_dir_operations;
 855 
 856         /* note, _this_ add_entry will not update dir's stat data */
 857         retval =
 858             reiserfs_add_entry(&th, dir, dentry->d_name.name,
 859                                dentry->d_name.len, inode, 1 /*visible */ );
 860         if (retval) {
 861                 int err;
 862                 clear_nlink(inode);
 863                 DEC_DIR_INODE_NLINK(dir);
 864                 reiserfs_update_sd(&th, inode);
 865                 err = journal_end(&th);
 866                 if (err)
 867                         retval = err;
 868                 unlock_new_inode(inode);
 869                 iput(inode);
 870                 goto out_failed;
 871         }
 872         /* the above add_entry did not update dir's stat data */
 873         reiserfs_update_sd(&th, dir);
 874 
 875         d_instantiate_new(dentry, inode);
 876         retval = journal_end(&th);
 877 out_failed:
 878         reiserfs_write_unlock(dir->i_sb);
 879         return retval;
 880 }
 881 
 882 static inline int reiserfs_empty_dir(struct inode *inode)
 883 {
 884         /*
 885          * we can cheat because an old format dir cannot have
 886          * EMPTY_DIR_SIZE, and a new format dir cannot have
 887          * EMPTY_DIR_SIZE_V1.  So, if the inode is either size,
 888          * regardless of disk format version, the directory is empty.
 889          */
 890         if (inode->i_size != EMPTY_DIR_SIZE &&
 891             inode->i_size != EMPTY_DIR_SIZE_V1) {
 892                 return 0;
 893         }
 894         return 1;
 895 }
 896 
 897 static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry)
 898 {
 899         int retval, err;
 900         struct inode *inode;
 901         struct reiserfs_transaction_handle th;
 902         int jbegin_count;
 903         INITIALIZE_PATH(path);
 904         struct reiserfs_dir_entry de;
 905 
 906         /*
 907          * we will be doing 2 balancings and update 2 stat data, we
 908          * change quotas of the owner of the directory and of the owner
 909          * of the parent directory.  The quota structure is possibly
 910          * deleted only on last iput => outside of this transaction
 911          */
 912         jbegin_count =
 913             JOURNAL_PER_BALANCE_CNT * 2 + 2 +
 914             4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
 915 
 916         retval = dquot_initialize(dir);
 917         if (retval)
 918                 return retval;
 919 
 920         reiserfs_write_lock(dir->i_sb);
 921         retval = journal_begin(&th, dir->i_sb, jbegin_count);
 922         if (retval)
 923                 goto out_rmdir;
 924 
 925         de.de_gen_number_bit_string = NULL;
 926         if ((retval =
 927              reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
 928                                  &path, &de)) == NAME_NOT_FOUND) {
 929                 retval = -ENOENT;
 930                 goto end_rmdir;
 931         } else if (retval == IO_ERROR) {
 932                 retval = -EIO;
 933                 goto end_rmdir;
 934         }
 935 
 936         inode = d_inode(dentry);
 937 
 938         reiserfs_update_inode_transaction(inode);
 939         reiserfs_update_inode_transaction(dir);
 940 
 941         if (de.de_objectid != inode->i_ino) {
 942                 /*
 943                  * FIXME: compare key of an object and a key found in the entry
 944                  */
 945                 retval = -EIO;
 946                 goto end_rmdir;
 947         }
 948         if (!reiserfs_empty_dir(inode)) {
 949                 retval = -ENOTEMPTY;
 950                 goto end_rmdir;
 951         }
 952 
 953         /* cut entry from dir directory */
 954         retval = reiserfs_cut_from_item(&th, &path, &de.de_entry_key,
 955                                         dir, NULL,      /* page */
 956                                         0 /*new file size - not used here */ );
 957         if (retval < 0)
 958                 goto end_rmdir;
 959 
 960         if (inode->i_nlink != 2 && inode->i_nlink != 1)
 961                 reiserfs_error(inode->i_sb, "reiserfs-7040",
 962                                "empty directory has nlink != 2 (%d)",
 963                                inode->i_nlink);
 964 
 965         clear_nlink(inode);
 966         inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(dir);
 967         reiserfs_update_sd(&th, inode);
 968 
 969         DEC_DIR_INODE_NLINK(dir)
 970             dir->i_size -= (DEH_SIZE + de.de_entrylen);
 971         reiserfs_update_sd(&th, dir);
 972 
 973         /* prevent empty directory from getting lost */
 974         add_save_link(&th, inode, 0 /* not truncate */ );
 975 
 976         retval = journal_end(&th);
 977         reiserfs_check_path(&path);
 978 out_rmdir:
 979         reiserfs_write_unlock(dir->i_sb);
 980         return retval;
 981 
 982 end_rmdir:
 983         /*
 984          * we must release path, because we did not call
 985          * reiserfs_cut_from_item, or reiserfs_cut_from_item does not
 986          * release path if operation was not complete
 987          */
 988         pathrelse(&path);
 989         err = journal_end(&th);
 990         reiserfs_write_unlock(dir->i_sb);
 991         return err ? err : retval;
 992 }
 993 
 994 static int reiserfs_unlink(struct inode *dir, struct dentry *dentry)
 995 {
 996         int retval, err;
 997         struct inode *inode;
 998         struct reiserfs_dir_entry de;
 999         INITIALIZE_PATH(path);
1000         struct reiserfs_transaction_handle th;
1001         int jbegin_count;
1002         unsigned long savelink;
1003 
1004         retval = dquot_initialize(dir);
1005         if (retval)
1006                 return retval;
1007 
1008         inode = d_inode(dentry);
1009 
1010         /*
1011          * in this transaction we can be doing at max two balancings and
1012          * update two stat datas, we change quotas of the owner of the
1013          * directory and of the owner of the parent directory. The quota
1014          * structure is possibly deleted only on iput => outside of
1015          * this transaction
1016          */
1017         jbegin_count =
1018             JOURNAL_PER_BALANCE_CNT * 2 + 2 +
1019             4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
1020 
1021         reiserfs_write_lock(dir->i_sb);
1022         retval = journal_begin(&th, dir->i_sb, jbegin_count);
1023         if (retval)
1024                 goto out_unlink;
1025 
1026         de.de_gen_number_bit_string = NULL;
1027         if ((retval =
1028              reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
1029                                  &path, &de)) == NAME_NOT_FOUND) {
1030                 retval = -ENOENT;
1031                 goto end_unlink;
1032         } else if (retval == IO_ERROR) {
1033                 retval = -EIO;
1034                 goto end_unlink;
1035         }
1036 
1037         reiserfs_update_inode_transaction(inode);
1038         reiserfs_update_inode_transaction(dir);
1039 
1040         if (de.de_objectid != inode->i_ino) {
1041                 /*
1042                  * FIXME: compare key of an object and a key found in the entry
1043                  */
1044                 retval = -EIO;
1045                 goto end_unlink;
1046         }
1047 
1048         if (!inode->i_nlink) {
1049                 reiserfs_warning(inode->i_sb, "reiserfs-7042",
1050                                  "deleting nonexistent file (%lu), %d",
1051                                  inode->i_ino, inode->i_nlink);
1052                 set_nlink(inode, 1);
1053         }
1054 
1055         drop_nlink(inode);
1056 
1057         /*
1058          * we schedule before doing the add_save_link call, save the link
1059          * count so we don't race
1060          */
1061         savelink = inode->i_nlink;
1062 
1063         retval =
1064             reiserfs_cut_from_item(&th, &path, &de.de_entry_key, dir, NULL,
1065                                    0);
1066         if (retval < 0) {
1067                 inc_nlink(inode);
1068                 goto end_unlink;
1069         }
1070         inode->i_ctime = current_time(inode);
1071         reiserfs_update_sd(&th, inode);
1072 
1073         dir->i_size -= (de.de_entrylen + DEH_SIZE);
1074         dir->i_ctime = dir->i_mtime = current_time(dir);
1075         reiserfs_update_sd(&th, dir);
1076 
1077         if (!savelink)
1078                 /* prevent file from getting lost */
1079                 add_save_link(&th, inode, 0 /* not truncate */ );
1080 
1081         retval = journal_end(&th);
1082         reiserfs_check_path(&path);
1083         reiserfs_write_unlock(dir->i_sb);
1084         return retval;
1085 
1086 end_unlink:
1087         pathrelse(&path);
1088         err = journal_end(&th);
1089         reiserfs_check_path(&path);
1090         if (err)
1091                 retval = err;
1092 out_unlink:
1093         reiserfs_write_unlock(dir->i_sb);
1094         return retval;
1095 }
1096 
1097 static int reiserfs_symlink(struct inode *parent_dir,
1098                             struct dentry *dentry, const char *symname)
1099 {
1100         int retval;
1101         struct inode *inode;
1102         char *name;
1103         int item_len;
1104         struct reiserfs_transaction_handle th;
1105         struct reiserfs_security_handle security;
1106         int mode = S_IFLNK | S_IRWXUGO;
1107         /*
1108          * We need blocks for transaction + (user+group)*(quotas for
1109          * new inode + update of quota for directory owner)
1110          */
1111         int jbegin_count =
1112             JOURNAL_PER_BALANCE_CNT * 3 +
1113             2 * (REISERFS_QUOTA_INIT_BLOCKS(parent_dir->i_sb) +
1114                  REISERFS_QUOTA_TRANS_BLOCKS(parent_dir->i_sb));
1115 
1116         retval = dquot_initialize(parent_dir);
1117         if (retval)
1118                 return retval;
1119 
1120         if (!(inode = new_inode(parent_dir->i_sb))) {
1121                 return -ENOMEM;
1122         }
1123         retval = new_inode_init(inode, parent_dir, mode);
1124         if (retval) {
1125                 drop_new_inode(inode);
1126                 return retval;
1127         }
1128 
1129         retval = reiserfs_security_init(parent_dir, inode, &dentry->d_name,
1130                                         &security);
1131         if (retval < 0) {
1132                 drop_new_inode(inode);
1133                 return retval;
1134         }
1135         jbegin_count += retval;
1136 
1137         reiserfs_write_lock(parent_dir->i_sb);
1138         item_len = ROUND_UP(strlen(symname));
1139         if (item_len > MAX_DIRECT_ITEM_LEN(parent_dir->i_sb->s_blocksize)) {
1140                 retval = -ENAMETOOLONG;
1141                 drop_new_inode(inode);
1142                 goto out_failed;
1143         }
1144 
1145         name = kmalloc(item_len, GFP_NOFS);
1146         if (!name) {
1147                 drop_new_inode(inode);
1148                 retval = -ENOMEM;
1149                 goto out_failed;
1150         }
1151         memcpy(name, symname, strlen(symname));
1152         padd_item(name, item_len, strlen(symname));
1153 
1154         retval = journal_begin(&th, parent_dir->i_sb, jbegin_count);
1155         if (retval) {
1156                 drop_new_inode(inode);
1157                 kfree(name);
1158                 goto out_failed;
1159         }
1160 
1161         retval =
1162             reiserfs_new_inode(&th, parent_dir, mode, name, strlen(symname),
1163                                dentry, inode, &security);
1164         kfree(name);
1165         if (retval) {           /* reiserfs_new_inode iputs for us */
1166                 goto out_failed;
1167         }
1168 
1169         reiserfs_update_inode_transaction(inode);
1170         reiserfs_update_inode_transaction(parent_dir);
1171 
1172         inode->i_op = &reiserfs_symlink_inode_operations;
1173         inode_nohighmem(inode);
1174         inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1175 
1176         retval = reiserfs_add_entry(&th, parent_dir, dentry->d_name.name,
1177                                     dentry->d_name.len, inode, 1 /*visible */ );
1178         if (retval) {
1179                 int err;
1180                 drop_nlink(inode);
1181                 reiserfs_update_sd(&th, inode);
1182                 err = journal_end(&th);
1183                 if (err)
1184                         retval = err;
1185                 unlock_new_inode(inode);
1186                 iput(inode);
1187                 goto out_failed;
1188         }
1189 
1190         d_instantiate_new(dentry, inode);
1191         retval = journal_end(&th);
1192 out_failed:
1193         reiserfs_write_unlock(parent_dir->i_sb);
1194         return retval;
1195 }
1196 
1197 static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
1198                          struct dentry *dentry)
1199 {
1200         int retval;
1201         struct inode *inode = d_inode(old_dentry);
1202         struct reiserfs_transaction_handle th;
1203         /*
1204          * We need blocks for transaction + update of quotas for
1205          * the owners of the directory
1206          */
1207         int jbegin_count =
1208             JOURNAL_PER_BALANCE_CNT * 3 +
1209             2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
1210 
1211         retval = dquot_initialize(dir);
1212         if (retval)
1213                 return retval;
1214 
1215         reiserfs_write_lock(dir->i_sb);
1216         if (inode->i_nlink >= REISERFS_LINK_MAX) {
1217                 /* FIXME: sd_nlink is 32 bit for new files */
1218                 reiserfs_write_unlock(dir->i_sb);
1219                 return -EMLINK;
1220         }
1221 
1222         /* inc before scheduling so reiserfs_unlink knows we are here */
1223         inc_nlink(inode);
1224 
1225         retval = journal_begin(&th, dir->i_sb, jbegin_count);
1226         if (retval) {
1227                 drop_nlink(inode);
1228                 reiserfs_write_unlock(dir->i_sb);
1229                 return retval;
1230         }
1231 
1232         /* create new entry */
1233         retval =
1234             reiserfs_add_entry(&th, dir, dentry->d_name.name,
1235                                dentry->d_name.len, inode, 1 /*visible */ );
1236 
1237         reiserfs_update_inode_transaction(inode);
1238         reiserfs_update_inode_transaction(dir);
1239 
1240         if (retval) {
1241                 int err;
1242                 drop_nlink(inode);
1243                 err = journal_end(&th);
1244                 reiserfs_write_unlock(dir->i_sb);
1245                 return err ? err : retval;
1246         }
1247 
1248         inode->i_ctime = current_time(inode);
1249         reiserfs_update_sd(&th, inode);
1250 
1251         ihold(inode);
1252         d_instantiate(dentry, inode);
1253         retval = journal_end(&th);
1254         reiserfs_write_unlock(dir->i_sb);
1255         return retval;
1256 }
1257 
1258 /* de contains information pointing to an entry which */
1259 static int de_still_valid(const char *name, int len,
1260                           struct reiserfs_dir_entry *de)
1261 {
1262         struct reiserfs_dir_entry tmp = *de;
1263 
1264         /* recalculate pointer to name and name length */
1265         set_de_name_and_namelen(&tmp);
1266         /* FIXME: could check more */
1267         if (tmp.de_namelen != len || memcmp(name, de->de_name, len))
1268                 return 0;
1269         return 1;
1270 }
1271 
1272 static int entry_points_to_object(const char *name, int len,
1273                                   struct reiserfs_dir_entry *de,
1274                                   struct inode *inode)
1275 {
1276         if (!de_still_valid(name, len, de))
1277                 return 0;
1278 
1279         if (inode) {
1280                 if (!de_visible(de->de_deh + de->de_entry_num))
1281                         reiserfs_panic(inode->i_sb, "vs-7042",
1282                                        "entry must be visible");
1283                 return (de->de_objectid == inode->i_ino) ? 1 : 0;
1284         }
1285 
1286         /* this must be added hidden entry */
1287         if (de_visible(de->de_deh + de->de_entry_num))
1288                 reiserfs_panic(NULL, "vs-7043", "entry must be visible");
1289 
1290         return 1;
1291 }
1292 
1293 /* sets key of objectid the entry has to point to */
1294 static void set_ino_in_dir_entry(struct reiserfs_dir_entry *de,
1295                                  struct reiserfs_key *key)
1296 {
1297         /* JDM These operations are endian safe - both are le */
1298         de->de_deh[de->de_entry_num].deh_dir_id = key->k_dir_id;
1299         de->de_deh[de->de_entry_num].deh_objectid = key->k_objectid;
1300 }
1301 
1302 /*
1303  * process, that is going to call fix_nodes/do_balance must hold only
1304  * one path. If it holds 2 or more, it can get into endless waiting in
1305  * get_empty_nodes or its clones
1306  */
1307 static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1308                            struct inode *new_dir, struct dentry *new_dentry,
1309                            unsigned int flags)
1310 {
1311         int retval;
1312         INITIALIZE_PATH(old_entry_path);
1313         INITIALIZE_PATH(new_entry_path);
1314         INITIALIZE_PATH(dot_dot_entry_path);
1315         struct item_head new_entry_ih, old_entry_ih, dot_dot_ih;
1316         struct reiserfs_dir_entry old_de, new_de, dot_dot_de;
1317         struct inode *old_inode, *new_dentry_inode;
1318         struct reiserfs_transaction_handle th;
1319         int jbegin_count;
1320         umode_t old_inode_mode;
1321         unsigned long savelink = 1;
1322         struct timespec64 ctime;
1323 
1324         if (flags & ~RENAME_NOREPLACE)
1325                 return -EINVAL;
1326 
1327         /*
1328          * three balancings: (1) old name removal, (2) new name insertion
1329          * and (3) maybe "save" link insertion
1330          * stat data updates: (1) old directory,
1331          * (2) new directory and (3) maybe old object stat data (when it is
1332          * directory) and (4) maybe stat data of object to which new entry
1333          * pointed initially and (5) maybe block containing ".." of
1334          * renamed directory
1335          * quota updates: two parent directories
1336          */
1337         jbegin_count =
1338             JOURNAL_PER_BALANCE_CNT * 3 + 5 +
1339             4 * REISERFS_QUOTA_TRANS_BLOCKS(old_dir->i_sb);
1340 
1341         retval = dquot_initialize(old_dir);
1342         if (retval)
1343                 return retval;
1344         retval = dquot_initialize(new_dir);
1345         if (retval)
1346                 return retval;
1347 
1348         old_inode = d_inode(old_dentry);
1349         new_dentry_inode = d_inode(new_dentry);
1350 
1351         /*
1352          * make sure that oldname still exists and points to an object we
1353          * are going to rename
1354          */
1355         old_de.de_gen_number_bit_string = NULL;
1356         reiserfs_write_lock(old_dir->i_sb);
1357         retval =
1358             reiserfs_find_entry(old_dir, old_dentry->d_name.name,
1359                                 old_dentry->d_name.len, &old_entry_path,
1360                                 &old_de);
1361         pathrelse(&old_entry_path);
1362         if (retval == IO_ERROR) {
1363                 reiserfs_write_unlock(old_dir->i_sb);
1364                 return -EIO;
1365         }
1366 
1367         if (retval != NAME_FOUND || old_de.de_objectid != old_inode->i_ino) {
1368                 reiserfs_write_unlock(old_dir->i_sb);
1369                 return -ENOENT;
1370         }
1371 
1372         old_inode_mode = old_inode->i_mode;
1373         if (S_ISDIR(old_inode_mode)) {
1374                 /*
1375                  * make sure that directory being renamed has correct ".."
1376                  * and that its new parent directory has not too many links
1377                  * already
1378                  */
1379                 if (new_dentry_inode) {
1380                         if (!reiserfs_empty_dir(new_dentry_inode)) {
1381                                 reiserfs_write_unlock(old_dir->i_sb);
1382                                 return -ENOTEMPTY;
1383                         }
1384                 }
1385 
1386                 /*
1387                  * directory is renamed, its parent directory will be changed,
1388                  * so find ".." entry
1389                  */
1390                 dot_dot_de.de_gen_number_bit_string = NULL;
1391                 retval =
1392                     reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path,
1393                                         &dot_dot_de);
1394                 pathrelse(&dot_dot_entry_path);
1395                 if (retval != NAME_FOUND) {
1396                         reiserfs_write_unlock(old_dir->i_sb);
1397                         return -EIO;
1398                 }
1399 
1400                 /* inode number of .. must equal old_dir->i_ino */
1401                 if (dot_dot_de.de_objectid != old_dir->i_ino) {
1402                         reiserfs_write_unlock(old_dir->i_sb);
1403                         return -EIO;
1404                 }
1405         }
1406 
1407         retval = journal_begin(&th, old_dir->i_sb, jbegin_count);
1408         if (retval) {
1409                 reiserfs_write_unlock(old_dir->i_sb);
1410                 return retval;
1411         }
1412 
1413         /* add new entry (or find the existing one) */
1414         retval =
1415             reiserfs_add_entry(&th, new_dir, new_dentry->d_name.name,
1416                                new_dentry->d_name.len, old_inode, 0);
1417         if (retval == -EEXIST) {
1418                 if (!new_dentry_inode) {
1419                         reiserfs_panic(old_dir->i_sb, "vs-7050",
1420                                        "new entry is found, new inode == 0");
1421                 }
1422         } else if (retval) {
1423                 int err = journal_end(&th);
1424                 reiserfs_write_unlock(old_dir->i_sb);
1425                 return err ? err : retval;
1426         }
1427 
1428         reiserfs_update_inode_transaction(old_dir);
1429         reiserfs_update_inode_transaction(new_dir);
1430 
1431         /*
1432          * this makes it so an fsync on an open fd for the old name will
1433          * commit the rename operation
1434          */
1435         reiserfs_update_inode_transaction(old_inode);
1436 
1437         if (new_dentry_inode)
1438                 reiserfs_update_inode_transaction(new_dentry_inode);
1439 
1440         while (1) {
1441                 /*
1442                  * look for old name using corresponding entry key
1443                  * (found by reiserfs_find_entry)
1444                  */
1445                 if ((retval =
1446                      search_by_entry_key(new_dir->i_sb, &old_de.de_entry_key,
1447                                          &old_entry_path,
1448                                          &old_de)) != NAME_FOUND) {
1449                         pathrelse(&old_entry_path);
1450                         journal_end(&th);
1451                         reiserfs_write_unlock(old_dir->i_sb);
1452                         return -EIO;
1453                 }
1454 
1455                 copy_item_head(&old_entry_ih, tp_item_head(&old_entry_path));
1456 
1457                 reiserfs_prepare_for_journal(old_inode->i_sb, old_de.de_bh, 1);
1458 
1459                 /* look for new name by reiserfs_find_entry */
1460                 new_de.de_gen_number_bit_string = NULL;
1461                 retval =
1462                     reiserfs_find_entry(new_dir, new_dentry->d_name.name,
1463                                         new_dentry->d_name.len, &new_entry_path,
1464                                         &new_de);
1465                 /*
1466                  * reiserfs_add_entry should not return IO_ERROR,
1467                  * because it is called with essentially same parameters from
1468                  * reiserfs_add_entry above, and we'll catch any i/o errors
1469                  * before we get here.
1470                  */
1471                 if (retval != NAME_FOUND_INVISIBLE && retval != NAME_FOUND) {
1472                         pathrelse(&new_entry_path);
1473                         pathrelse(&old_entry_path);
1474                         journal_end(&th);
1475                         reiserfs_write_unlock(old_dir->i_sb);
1476                         return -EIO;
1477                 }
1478 
1479                 copy_item_head(&new_entry_ih, tp_item_head(&new_entry_path));
1480 
1481                 reiserfs_prepare_for_journal(old_inode->i_sb, new_de.de_bh, 1);
1482 
1483                 if (S_ISDIR(old_inode->i_mode)) {
1484                         if ((retval =
1485                              search_by_entry_key(new_dir->i_sb,
1486                                                  &dot_dot_de.de_entry_key,
1487                                                  &dot_dot_entry_path,
1488                                                  &dot_dot_de)) != NAME_FOUND) {
1489                                 pathrelse(&dot_dot_entry_path);
1490                                 pathrelse(&new_entry_path);
1491                                 pathrelse(&old_entry_path);
1492                                 journal_end(&th);
1493                                 reiserfs_write_unlock(old_dir->i_sb);
1494                                 return -EIO;
1495                         }
1496                         copy_item_head(&dot_dot_ih,
1497                                        tp_item_head(&dot_dot_entry_path));
1498                         /* node containing ".." gets into transaction */
1499                         reiserfs_prepare_for_journal(old_inode->i_sb,
1500                                                      dot_dot_de.de_bh, 1);
1501                 }
1502                 /*
1503                  * we should check seals here, not do
1504                  * this stuff, yes? Then, having
1505                  * gathered everything into RAM we
1506                  * should lock the buffers, yes?  -Hans
1507                  */
1508                 /*
1509                  * probably.  our rename needs to hold more
1510                  * than one path at once.  The seals would
1511                  * have to be written to deal with multi-path
1512                  * issues -chris
1513                  */
1514                 /*
1515                  * sanity checking before doing the rename - avoid races many
1516                  * of the above checks could have scheduled.  We have to be
1517                  * sure our items haven't been shifted by another process.
1518                  */
1519                 if (item_moved(&new_entry_ih, &new_entry_path) ||
1520                     !entry_points_to_object(new_dentry->d_name.name,
1521                                             new_dentry->d_name.len,
1522                                             &new_de, new_dentry_inode) ||
1523                     item_moved(&old_entry_ih, &old_entry_path) ||
1524                     !entry_points_to_object(old_dentry->d_name.name,
1525                                             old_dentry->d_name.len,
1526                                             &old_de, old_inode)) {
1527                         reiserfs_restore_prepared_buffer(old_inode->i_sb,
1528                                                          new_de.de_bh);
1529                         reiserfs_restore_prepared_buffer(old_inode->i_sb,
1530                                                          old_de.de_bh);
1531                         if (S_ISDIR(old_inode_mode))
1532                                 reiserfs_restore_prepared_buffer(old_inode->
1533                                                                  i_sb,
1534                                                                  dot_dot_de.
1535                                                                  de_bh);
1536                         continue;
1537                 }
1538                 if (S_ISDIR(old_inode_mode)) {
1539                         if (item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
1540                             !entry_points_to_object("..", 2, &dot_dot_de,
1541                                                     old_dir)) {
1542                                 reiserfs_restore_prepared_buffer(old_inode->
1543                                                                  i_sb,
1544                                                                  old_de.de_bh);
1545                                 reiserfs_restore_prepared_buffer(old_inode->
1546                                                                  i_sb,
1547                                                                  new_de.de_bh);
1548                                 reiserfs_restore_prepared_buffer(old_inode->
1549                                                                  i_sb,
1550                                                                  dot_dot_de.
1551                                                                  de_bh);
1552                                 continue;
1553                         }
1554                 }
1555 
1556                 RFALSE(S_ISDIR(old_inode_mode) &&
1557                        !buffer_journal_prepared(dot_dot_de.de_bh), "");
1558 
1559                 break;
1560         }
1561 
1562         /*
1563          * ok, all the changes can be done in one fell swoop when we
1564          * have claimed all the buffers needed.
1565          */
1566 
1567         mark_de_visible(new_de.de_deh + new_de.de_entry_num);
1568         set_ino_in_dir_entry(&new_de, INODE_PKEY(old_inode));
1569         journal_mark_dirty(&th, new_de.de_bh);
1570 
1571         mark_de_hidden(old_de.de_deh + old_de.de_entry_num);
1572         journal_mark_dirty(&th, old_de.de_bh);
1573         ctime = current_time(old_dir);
1574         old_dir->i_ctime = old_dir->i_mtime = ctime;
1575         new_dir->i_ctime = new_dir->i_mtime = ctime;
1576         /*
1577          * thanks to Alex Adriaanse <alex_a@caltech.edu> for patch
1578          * which adds ctime update of renamed object
1579          */
1580         old_inode->i_ctime = ctime;
1581 
1582         if (new_dentry_inode) {
1583                 /* adjust link number of the victim */
1584                 if (S_ISDIR(new_dentry_inode->i_mode)) {
1585                         clear_nlink(new_dentry_inode);
1586                 } else {
1587                         drop_nlink(new_dentry_inode);
1588                 }
1589                 new_dentry_inode->i_ctime = ctime;
1590                 savelink = new_dentry_inode->i_nlink;
1591         }
1592 
1593         if (S_ISDIR(old_inode_mode)) {
1594                 /* adjust ".." of renamed directory */
1595                 set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir));
1596                 journal_mark_dirty(&th, dot_dot_de.de_bh);
1597 
1598                 /*
1599                  * there (in new_dir) was no directory, so it got new link
1600                  * (".."  of renamed directory)
1601                  */
1602                 if (!new_dentry_inode)
1603                         INC_DIR_INODE_NLINK(new_dir);
1604 
1605                 /* old directory lost one link - ".. " of renamed directory */
1606                 DEC_DIR_INODE_NLINK(old_dir);
1607         }
1608         /*
1609          * looks like in 2.3.99pre3 brelse is atomic.
1610          * so we can use pathrelse
1611          */
1612         pathrelse(&new_entry_path);
1613         pathrelse(&dot_dot_entry_path);
1614 
1615         /*
1616          * FIXME: this reiserfs_cut_from_item's return value may screw up
1617          * anybody, but it will panic if will not be able to find the
1618          * entry. This needs one more clean up
1619          */
1620         if (reiserfs_cut_from_item
1621             (&th, &old_entry_path, &old_de.de_entry_key, old_dir, NULL,
1622              0) < 0)
1623                 reiserfs_error(old_dir->i_sb, "vs-7060",
1624                                "couldn't not cut old name. Fsck later?");
1625 
1626         old_dir->i_size -= DEH_SIZE + old_de.de_entrylen;
1627 
1628         reiserfs_update_sd(&th, old_dir);
1629         reiserfs_update_sd(&th, new_dir);
1630         reiserfs_update_sd(&th, old_inode);
1631 
1632         if (new_dentry_inode) {
1633                 if (savelink == 0)
1634                         add_save_link(&th, new_dentry_inode,
1635                                       0 /* not truncate */ );
1636                 reiserfs_update_sd(&th, new_dentry_inode);
1637         }
1638 
1639         retval = journal_end(&th);
1640         reiserfs_write_unlock(old_dir->i_sb);
1641         return retval;
1642 }
1643 
1644 /* directories can handle most operations...  */
1645 const struct inode_operations reiserfs_dir_inode_operations = {
1646         .create = reiserfs_create,
1647         .lookup = reiserfs_lookup,
1648         .link = reiserfs_link,
1649         .unlink = reiserfs_unlink,
1650         .symlink = reiserfs_symlink,
1651         .mkdir = reiserfs_mkdir,
1652         .rmdir = reiserfs_rmdir,
1653         .mknod = reiserfs_mknod,
1654         .rename = reiserfs_rename,
1655         .setattr = reiserfs_setattr,
1656         .listxattr = reiserfs_listxattr,
1657         .permission = reiserfs_permission,
1658         .get_acl = reiserfs_get_acl,
1659         .set_acl = reiserfs_set_acl,
1660 };
1661 
1662 /*
1663  * symlink operations.. same as page_symlink_inode_operations, with xattr
1664  * stuff added
1665  */
1666 const struct inode_operations reiserfs_symlink_inode_operations = {
1667         .get_link       = page_get_link,
1668         .setattr = reiserfs_setattr,
1669         .listxattr = reiserfs_listxattr,
1670         .permission = reiserfs_permission,
1671 };
1672 
1673 /*
1674  * special file operations.. just xattr/acl stuff
1675  */
1676 const struct inode_operations reiserfs_special_inode_operations = {
1677         .setattr = reiserfs_setattr,
1678         .listxattr = reiserfs_listxattr,
1679         .permission = reiserfs_permission,
1680         .get_acl = reiserfs_get_acl,
1681         .set_acl = reiserfs_set_acl,
1682 };
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root/fs/reiserfs/namei.c

DEFINITIONS
