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TOMOYO Linux Cross Reference
Linux/fs/reiserfs/namei.c

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  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
381                  */
382                 if (IS_PRIVATE(dir))
383                         inode->i_flags |= S_PRIVATE;
384         }
385         reiserfs_write_unlock(dir->i_sb);
386         if (retval == IO_ERROR) {
387                 return ERR_PTR(-EIO);
388         }
389 
390         return d_splice_alias(inode, dentry);
391 }
392 
393 /*
394  * looks up the dentry of the parent directory for child.
395  * taken from ext2_get_parent
396  */
397 struct dentry *reiserfs_get_parent(struct dentry *child)
398 {
399         int retval;
400         struct inode *inode = NULL;
401         struct reiserfs_dir_entry de;
402         INITIALIZE_PATH(path_to_entry);
403         struct inode *dir = d_inode(child);
404 
405         if (dir->i_nlink == 0) {
406                 return ERR_PTR(-ENOENT);
407         }
408         de.de_gen_number_bit_string = NULL;
409 
410         reiserfs_write_lock(dir->i_sb);
411         retval = reiserfs_find_entry(dir, "..", 2, &path_to_entry, &de);
412         pathrelse(&path_to_entry);
413         if (retval != NAME_FOUND) {
414                 reiserfs_write_unlock(dir->i_sb);
415                 return ERR_PTR(-ENOENT);
416         }
417         inode = reiserfs_iget(dir->i_sb, (struct cpu_key *)&de.de_dir_id);
418         reiserfs_write_unlock(dir->i_sb);
419 
420         return d_obtain_alias(inode);
421 }
422 
423 /* add entry to the directory (entry can be hidden).
424 
425 insert definition of when hidden directories are used here -Hans
426 
427  Does not mark dir   inode dirty, do it after successesfull call to it */
428 
429 static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
430                               struct inode *dir, const char *name, int namelen,
431                               struct inode *inode, int visible)
432 {
433         struct cpu_key entry_key;
434         struct reiserfs_de_head *deh;
435         INITIALIZE_PATH(path);
436         struct reiserfs_dir_entry de;
437         DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1);
438         int gen_number;
439 
440         /*
441          * 48 bytes now and we avoid kmalloc if we
442          * create file with short name
443          */
444         char small_buf[32 + DEH_SIZE];
445 
446         char *buffer;
447         int buflen, paste_size;
448         int retval;
449 
450         BUG_ON(!th->t_trans_id);
451 
452         /* cannot allow items to be added into a busy deleted directory */
453         if (!namelen)
454                 return -EINVAL;
455 
456         if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
457                 return -ENAMETOOLONG;
458 
459         /* each entry has unique key. compose it */
460         make_cpu_key(&entry_key, dir,
461                      get_third_component(dir->i_sb, name, namelen),
462                      TYPE_DIRENTRY, 3);
463 
464         /* get memory for composing the entry */
465         buflen = DEH_SIZE + ROUND_UP(namelen);
466         if (buflen > sizeof(small_buf)) {
467                 buffer = kmalloc(buflen, GFP_NOFS);
468                 if (!buffer)
469                         return -ENOMEM;
470         } else
471                 buffer = small_buf;
472 
473         paste_size =
474             (get_inode_sd_version(dir) ==
475              STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen;
476 
477         /*
478          * fill buffer : directory entry head, name[, dir objectid | ,
479          * stat data | ,stat data, dir objectid ]
480          */
481         deh = (struct reiserfs_de_head *)buffer;
482         deh->deh_location = 0;  /* JDM Endian safe if 0 */
483         put_deh_offset(deh, cpu_key_k_offset(&entry_key));
484         deh->deh_state = 0;     /* JDM Endian safe if 0 */
485         /* put key (ino analog) to de */
486 
487         /* safe: k_dir_id is le */
488         deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id;
489         /* safe: k_objectid is le */
490         deh->deh_objectid = INODE_PKEY(inode)->k_objectid;
491 
492         /* copy name */
493         memcpy((char *)(deh + 1), name, namelen);
494         /* padd by 0s to the 4 byte boundary */
495         padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen);
496 
497         /*
498          * entry is ready to be pasted into tree, set 'visibility'
499          * and 'stat data in entry' attributes
500          */
501         mark_de_without_sd(deh);
502         visible ? mark_de_visible(deh) : mark_de_hidden(deh);
503 
504         /* find the proper place for the new entry */
505         memset(bit_string, 0, sizeof(bit_string));
506         de.de_gen_number_bit_string = bit_string;
507         retval = reiserfs_find_entry(dir, name, namelen, &path, &de);
508         if (retval != NAME_NOT_FOUND) {
509                 if (buffer != small_buf)
510                         kfree(buffer);
511                 pathrelse(&path);
512 
513                 if (retval == IO_ERROR) {
514                         return -EIO;
515                 }
516 
517                 if (retval != NAME_FOUND) {
518                         reiserfs_error(dir->i_sb, "zam-7002",
519                                        "reiserfs_find_entry() returned "
520                                        "unexpected value (%d)", retval);
521                 }
522 
523                 return -EEXIST;
524         }
525 
526         gen_number =
527             find_first_zero_bit(bit_string,
528                                 MAX_GENERATION_NUMBER + 1);
529         if (gen_number > MAX_GENERATION_NUMBER) {
530                 /* there is no free generation number */
531                 reiserfs_warning(dir->i_sb, "reiserfs-7010",
532                                  "Congratulations! we have got hash function "
533                                  "screwed up");
534                 if (buffer != small_buf)
535                         kfree(buffer);
536                 pathrelse(&path);
537                 return -EBUSY;
538         }
539         /* adjust offset of directory enrty */
540         put_deh_offset(deh, SET_GENERATION_NUMBER(deh_offset(deh), gen_number));
541         set_cpu_key_k_offset(&entry_key, deh_offset(deh));
542 
543         /* update max-hash-collisions counter in reiserfs_sb_info */
544         PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number);
545 
546         /* we need to re-search for the insertion point */
547         if (gen_number != 0) {
548                 if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) !=
549                     NAME_NOT_FOUND) {
550                         reiserfs_warning(dir->i_sb, "vs-7032",
551                                          "entry with this key (%K) already "
552                                          "exists", &entry_key);
553 
554                         if (buffer != small_buf)
555                                 kfree(buffer);
556                         pathrelse(&path);
557                         return -EBUSY;
558                 }
559         }
560 
561         /* perform the insertion of the entry that we have prepared */
562         retval =
563             reiserfs_paste_into_item(th, &path, &entry_key, dir, buffer,
564                                      paste_size);
565         if (buffer != small_buf)
566                 kfree(buffer);
567         if (retval) {
568                 reiserfs_check_path(&path);
569                 return retval;
570         }
571 
572         dir->i_size += paste_size;
573         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
574         if (!S_ISDIR(inode->i_mode) && visible)
575                 /* reiserfs_mkdir or reiserfs_rename will do that by itself */
576                 reiserfs_update_sd(th, dir);
577 
578         reiserfs_check_path(&path);
579         return 0;
580 }
581 
582 /*
583  * quota utility function, call if you've had to abort after calling
584  * new_inode_init, and have not called reiserfs_new_inode yet.
585  * This should only be called on inodes that do not have stat data
586  * inserted into the tree yet.
587  */
588 static int drop_new_inode(struct inode *inode)
589 {
590         dquot_drop(inode);
591         make_bad_inode(inode);
592         inode->i_flags |= S_NOQUOTA;
593         iput(inode);
594         return 0;
595 }
596 
597 /*
598  * utility function that does setup for reiserfs_new_inode.
599  * dquot_initialize needs lots of credits so it's better to have it
600  * outside of a transaction, so we had to pull some bits of
601  * reiserfs_new_inode out into this func.
602  */
603 static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode)
604 {
605         /*
606          * Make inode invalid - just in case we are going to drop it before
607          * the initialization happens
608          */
609         INODE_PKEY(inode)->k_objectid = 0;
610 
611         /*
612          * the quota init calls have to know who to charge the quota to, so
613          * we have to set uid and gid here
614          */
615         inode_init_owner(inode, dir, mode);
616         dquot_initialize(inode);
617         return 0;
618 }
619 
620 static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
621                            bool excl)
622 {
623         int retval;
624         struct inode *inode;
625         /*
626          * We need blocks for transaction + (user+group)*(quotas
627          * for new inode + update of quota for directory owner)
628          */
629         int jbegin_count =
630             JOURNAL_PER_BALANCE_CNT * 2 +
631             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
632                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
633         struct reiserfs_transaction_handle th;
634         struct reiserfs_security_handle security;
635 
636         dquot_initialize(dir);
637 
638         if (!(inode = new_inode(dir->i_sb))) {
639                 return -ENOMEM;
640         }
641         new_inode_init(inode, dir, mode);
642 
643         jbegin_count += reiserfs_cache_default_acl(dir);
644         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
645         if (retval < 0) {
646                 drop_new_inode(inode);
647                 return retval;
648         }
649         jbegin_count += retval;
650         reiserfs_write_lock(dir->i_sb);
651 
652         retval = journal_begin(&th, dir->i_sb, jbegin_count);
653         if (retval) {
654                 drop_new_inode(inode);
655                 goto out_failed;
656         }
657 
658         retval =
659             reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
660                                inode, &security);
661         if (retval)
662                 goto out_failed;
663 
664         inode->i_op = &reiserfs_file_inode_operations;
665         inode->i_fop = &reiserfs_file_operations;
666         inode->i_mapping->a_ops = &reiserfs_address_space_operations;
667 
668         retval =
669             reiserfs_add_entry(&th, dir, dentry->d_name.name,
670                                dentry->d_name.len, inode, 1 /*visible */ );
671         if (retval) {
672                 int err;
673                 drop_nlink(inode);
674                 reiserfs_update_sd(&th, inode);
675                 err = journal_end(&th);
676                 if (err)
677                         retval = err;
678                 unlock_new_inode(inode);
679                 iput(inode);
680                 goto out_failed;
681         }
682         reiserfs_update_inode_transaction(inode);
683         reiserfs_update_inode_transaction(dir);
684 
685         unlock_new_inode(inode);
686         d_instantiate(dentry, inode);
687         retval = journal_end(&th);
688 
689 out_failed:
690         reiserfs_write_unlock(dir->i_sb);
691         return retval;
692 }
693 
694 static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
695                           dev_t rdev)
696 {
697         int retval;
698         struct inode *inode;
699         struct reiserfs_transaction_handle th;
700         struct reiserfs_security_handle security;
701         /*
702          * We need blocks for transaction + (user+group)*(quotas
703          * for new inode + update of quota for directory owner)
704          */
705         int jbegin_count =
706             JOURNAL_PER_BALANCE_CNT * 3 +
707             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
708                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
709 
710         if (!new_valid_dev(rdev))
711                 return -EINVAL;
712 
713         dquot_initialize(dir);
714 
715         if (!(inode = new_inode(dir->i_sb))) {
716                 return -ENOMEM;
717         }
718         new_inode_init(inode, dir, mode);
719 
720         jbegin_count += reiserfs_cache_default_acl(dir);
721         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
722         if (retval < 0) {
723                 drop_new_inode(inode);
724                 return retval;
725         }
726         jbegin_count += retval;
727         reiserfs_write_lock(dir->i_sb);
728 
729         retval = journal_begin(&th, dir->i_sb, jbegin_count);
730         if (retval) {
731                 drop_new_inode(inode);
732                 goto out_failed;
733         }
734 
735         retval =
736             reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
737                                inode, &security);
738         if (retval) {
739                 goto out_failed;
740         }
741 
742         inode->i_op = &reiserfs_special_inode_operations;
743         init_special_inode(inode, inode->i_mode, rdev);
744 
745         /* FIXME: needed for block and char devices only */
746         reiserfs_update_sd(&th, inode);
747 
748         reiserfs_update_inode_transaction(inode);
749         reiserfs_update_inode_transaction(dir);
750 
751         retval =
752             reiserfs_add_entry(&th, dir, dentry->d_name.name,
753                                dentry->d_name.len, inode, 1 /*visible */ );
754         if (retval) {
755                 int err;
756                 drop_nlink(inode);
757                 reiserfs_update_sd(&th, inode);
758                 err = journal_end(&th);
759                 if (err)
760                         retval = err;
761                 unlock_new_inode(inode);
762                 iput(inode);
763                 goto out_failed;
764         }
765 
766         unlock_new_inode(inode);
767         d_instantiate(dentry, inode);
768         retval = journal_end(&th);
769 
770 out_failed:
771         reiserfs_write_unlock(dir->i_sb);
772         return retval;
773 }
774 
775 static int reiserfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
776 {
777         int retval;
778         struct inode *inode;
779         struct reiserfs_transaction_handle th;
780         struct reiserfs_security_handle security;
781         /*
782          * We need blocks for transaction + (user+group)*(quotas
783          * for new inode + update of quota for directory owner)
784          */
785         int jbegin_count =
786             JOURNAL_PER_BALANCE_CNT * 3 +
787             2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
788                  REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
789 
790         dquot_initialize(dir);
791 
792 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
793         /*
794          * set flag that new packing locality created and new blocks
795          * for the content of that directory are not displaced yet
796          */
797         REISERFS_I(dir)->new_packing_locality = 1;
798 #endif
799         mode = S_IFDIR | mode;
800         if (!(inode = new_inode(dir->i_sb))) {
801                 return -ENOMEM;
802         }
803         new_inode_init(inode, dir, mode);
804 
805         jbegin_count += reiserfs_cache_default_acl(dir);
806         retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
807         if (retval < 0) {
808                 drop_new_inode(inode);
809                 return retval;
810         }
811         jbegin_count += retval;
812         reiserfs_write_lock(dir->i_sb);
813 
814         retval = journal_begin(&th, dir->i_sb, jbegin_count);
815         if (retval) {
816                 drop_new_inode(inode);
817                 goto out_failed;
818         }
819 
820         /*
821          * inc the link count now, so another writer doesn't overflow
822          * it while we sleep later on.
823          */
824         INC_DIR_INODE_NLINK(dir)
825 
826             retval = reiserfs_new_inode(&th, dir, mode, NULL /*symlink */ ,
827                                         old_format_only(dir->i_sb) ?
828                                         EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
829                                         dentry, inode, &security);
830         if (retval) {
831                 DEC_DIR_INODE_NLINK(dir)
832                 goto out_failed;
833         }
834 
835         reiserfs_update_inode_transaction(inode);
836         reiserfs_update_inode_transaction(dir);
837 
838         inode->i_op = &reiserfs_dir_inode_operations;
839         inode->i_fop = &reiserfs_dir_operations;
840 
841         /* note, _this_ add_entry will not update dir's stat data */
842         retval =
843             reiserfs_add_entry(&th, dir, dentry->d_name.name,
844                                dentry->d_name.len, inode, 1 /*visible */ );
845         if (retval) {
846                 int err;
847                 clear_nlink(inode);
848                 DEC_DIR_INODE_NLINK(dir);
849                 reiserfs_update_sd(&th, inode);
850                 err = journal_end(&th);
851                 if (err)
852                         retval = err;
853                 unlock_new_inode(inode);
854                 iput(inode);
855                 goto out_failed;
856         }
857         /* the above add_entry did not update dir's stat data */
858         reiserfs_update_sd(&th, dir);
859 
860         unlock_new_inode(inode);
861         d_instantiate(dentry, inode);
862         retval = journal_end(&th);
863 out_failed:
864         reiserfs_write_unlock(dir->i_sb);
865         return retval;
866 }
867 
868 static inline int reiserfs_empty_dir(struct inode *inode)
869 {
870         /*
871          * we can cheat because an old format dir cannot have
872          * EMPTY_DIR_SIZE, and a new format dir cannot have
873          * EMPTY_DIR_SIZE_V1.  So, if the inode is either size,
874          * regardless of disk format version, the directory is empty.
875          */
876         if (inode->i_size != EMPTY_DIR_SIZE &&
877             inode->i_size != EMPTY_DIR_SIZE_V1) {
878                 return 0;
879         }
880         return 1;
881 }
882 
883 static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry)
884 {
885         int retval, err;
886         struct inode *inode;
887         struct reiserfs_transaction_handle th;
888         int jbegin_count;
889         INITIALIZE_PATH(path);
890         struct reiserfs_dir_entry de;
891 
892         /*
893          * we will be doing 2 balancings and update 2 stat data, we
894          * change quotas of the owner of the directory and of the owner
895          * of the parent directory.  The quota structure is possibly
896          * deleted only on last iput => outside of this transaction
897          */
898         jbegin_count =
899             JOURNAL_PER_BALANCE_CNT * 2 + 2 +
900             4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
901 
902         dquot_initialize(dir);
903 
904         reiserfs_write_lock(dir->i_sb);
905         retval = journal_begin(&th, dir->i_sb, jbegin_count);
906         if (retval)
907                 goto out_rmdir;
908 
909         de.de_gen_number_bit_string = NULL;
910         if ((retval =
911              reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
912                                  &path, &de)) == NAME_NOT_FOUND) {
913                 retval = -ENOENT;
914                 goto end_rmdir;
915         } else if (retval == IO_ERROR) {
916                 retval = -EIO;
917                 goto end_rmdir;
918         }
919 
920         inode = d_inode(dentry);
921 
922         reiserfs_update_inode_transaction(inode);
923         reiserfs_update_inode_transaction(dir);
924 
925         if (de.de_objectid != inode->i_ino) {
926                 /*
927                  * FIXME: compare key of an object and a key found in the entry
928                  */
929                 retval = -EIO;
930                 goto end_rmdir;
931         }
932         if (!reiserfs_empty_dir(inode)) {
933                 retval = -ENOTEMPTY;
934                 goto end_rmdir;
935         }
936 
937         /* cut entry from dir directory */
938         retval = reiserfs_cut_from_item(&th, &path, &de.de_entry_key,
939                                         dir, NULL,      /* page */
940                                         0 /*new file size - not used here */ );
941         if (retval < 0)
942                 goto end_rmdir;
943 
944         if (inode->i_nlink != 2 && inode->i_nlink != 1)
945                 reiserfs_error(inode->i_sb, "reiserfs-7040",
946                                "empty directory has nlink != 2 (%d)",
947                                inode->i_nlink);
948 
949         clear_nlink(inode);
950         inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
951         reiserfs_update_sd(&th, inode);
952 
953         DEC_DIR_INODE_NLINK(dir)
954             dir->i_size -= (DEH_SIZE + de.de_entrylen);
955         reiserfs_update_sd(&th, dir);
956 
957         /* prevent empty directory from getting lost */
958         add_save_link(&th, inode, 0 /* not truncate */ );
959 
960         retval = journal_end(&th);
961         reiserfs_check_path(&path);
962 out_rmdir:
963         reiserfs_write_unlock(dir->i_sb);
964         return retval;
965 
966 end_rmdir:
967         /*
968          * we must release path, because we did not call
969          * reiserfs_cut_from_item, or reiserfs_cut_from_item does not
970          * release path if operation was not complete
971          */
972         pathrelse(&path);
973         err = journal_end(&th);
974         reiserfs_write_unlock(dir->i_sb);
975         return err ? err : retval;
976 }
977 
978 static int reiserfs_unlink(struct inode *dir, struct dentry *dentry)
979 {
980         int retval, err;
981         struct inode *inode;
982         struct reiserfs_dir_entry de;
983         INITIALIZE_PATH(path);
984         struct reiserfs_transaction_handle th;
985         int jbegin_count;
986         unsigned long savelink;
987 
988         dquot_initialize(dir);
989 
990         inode = d_inode(dentry);
991 
992         /*
993          * in this transaction we can be doing at max two balancings and
994          * update two stat datas, we change quotas of the owner of the
995          * directory and of the owner of the parent directory. The quota
996          * structure is possibly deleted only on iput => outside of
997          * this transaction
998          */
999         jbegin_count =
1000             JOURNAL_PER_BALANCE_CNT * 2 + 2 +
1001             4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
1002 
1003         reiserfs_write_lock(dir->i_sb);
1004         retval = journal_begin(&th, dir->i_sb, jbegin_count);
1005         if (retval)
1006                 goto out_unlink;
1007 
1008         de.de_gen_number_bit_string = NULL;
1009         if ((retval =
1010              reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
1011                                  &path, &de)) == NAME_NOT_FOUND) {
1012                 retval = -ENOENT;
1013                 goto end_unlink;
1014         } else if (retval == IO_ERROR) {
1015                 retval = -EIO;
1016                 goto end_unlink;
1017         }
1018 
1019         reiserfs_update_inode_transaction(inode);
1020         reiserfs_update_inode_transaction(dir);
1021 
1022         if (de.de_objectid != inode->i_ino) {
1023                 /*
1024                  * FIXME: compare key of an object and a key found in the entry
1025                  */
1026                 retval = -EIO;
1027                 goto end_unlink;
1028         }
1029 
1030         if (!inode->i_nlink) {
1031                 reiserfs_warning(inode->i_sb, "reiserfs-7042",
1032                                  "deleting nonexistent file (%lu), %d",
1033                                  inode->i_ino, inode->i_nlink);
1034                 set_nlink(inode, 1);
1035         }
1036 
1037         drop_nlink(inode);
1038 
1039         /*
1040          * we schedule before doing the add_save_link call, save the link
1041          * count so we don't race
1042          */
1043         savelink = inode->i_nlink;
1044 
1045         retval =
1046             reiserfs_cut_from_item(&th, &path, &de.de_entry_key, dir, NULL,
1047                                    0);
1048         if (retval < 0) {
1049                 inc_nlink(inode);
1050                 goto end_unlink;
1051         }
1052         inode->i_ctime = CURRENT_TIME_SEC;
1053         reiserfs_update_sd(&th, inode);
1054 
1055         dir->i_size -= (de.de_entrylen + DEH_SIZE);
1056         dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
1057         reiserfs_update_sd(&th, dir);
1058 
1059         if (!savelink)
1060                 /* prevent file from getting lost */
1061                 add_save_link(&th, inode, 0 /* not truncate */ );
1062 
1063         retval = journal_end(&th);
1064         reiserfs_check_path(&path);
1065         reiserfs_write_unlock(dir->i_sb);
1066         return retval;
1067 
1068 end_unlink:
1069         pathrelse(&path);
1070         err = journal_end(&th);
1071         reiserfs_check_path(&path);
1072         if (err)
1073                 retval = err;
1074 out_unlink:
1075         reiserfs_write_unlock(dir->i_sb);
1076         return retval;
1077 }
1078 
1079 static int reiserfs_symlink(struct inode *parent_dir,
1080                             struct dentry *dentry, const char *symname)
1081 {
1082         int retval;
1083         struct inode *inode;
1084         char *name;
1085         int item_len;
1086         struct reiserfs_transaction_handle th;
1087         struct reiserfs_security_handle security;
1088         int mode = S_IFLNK | S_IRWXUGO;
1089         /*
1090          * We need blocks for transaction + (user+group)*(quotas for
1091          * new inode + update of quota for directory owner)
1092          */
1093         int jbegin_count =
1094             JOURNAL_PER_BALANCE_CNT * 3 +
1095             2 * (REISERFS_QUOTA_INIT_BLOCKS(parent_dir->i_sb) +
1096                  REISERFS_QUOTA_TRANS_BLOCKS(parent_dir->i_sb));
1097 
1098         dquot_initialize(parent_dir);
1099 
1100         if (!(inode = new_inode(parent_dir->i_sb))) {
1101                 return -ENOMEM;
1102         }
1103         new_inode_init(inode, parent_dir, mode);
1104 
1105         retval = reiserfs_security_init(parent_dir, inode, &dentry->d_name,
1106                                         &security);
1107         if (retval < 0) {
1108                 drop_new_inode(inode);
1109                 return retval;
1110         }
1111         jbegin_count += retval;
1112 
1113         reiserfs_write_lock(parent_dir->i_sb);
1114         item_len = ROUND_UP(strlen(symname));
1115         if (item_len > MAX_DIRECT_ITEM_LEN(parent_dir->i_sb->s_blocksize)) {
1116                 retval = -ENAMETOOLONG;
1117                 drop_new_inode(inode);
1118                 goto out_failed;
1119         }
1120 
1121         name = kmalloc(item_len, GFP_NOFS);
1122         if (!name) {
1123                 drop_new_inode(inode);
1124                 retval = -ENOMEM;
1125                 goto out_failed;
1126         }
1127         memcpy(name, symname, strlen(symname));
1128         padd_item(name, item_len, strlen(symname));
1129 
1130         retval = journal_begin(&th, parent_dir->i_sb, jbegin_count);
1131         if (retval) {
1132                 drop_new_inode(inode);
1133                 kfree(name);
1134                 goto out_failed;
1135         }
1136 
1137         retval =
1138             reiserfs_new_inode(&th, parent_dir, mode, name, strlen(symname),
1139                                dentry, inode, &security);
1140         kfree(name);
1141         if (retval) {           /* reiserfs_new_inode iputs for us */
1142                 goto out_failed;
1143         }
1144 
1145         reiserfs_update_inode_transaction(inode);
1146         reiserfs_update_inode_transaction(parent_dir);
1147 
1148         inode->i_op = &reiserfs_symlink_inode_operations;
1149         inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1150 
1151         retval = reiserfs_add_entry(&th, parent_dir, dentry->d_name.name,
1152                                     dentry->d_name.len, inode, 1 /*visible */ );
1153         if (retval) {
1154                 int err;
1155                 drop_nlink(inode);
1156                 reiserfs_update_sd(&th, inode);
1157                 err = journal_end(&th);
1158                 if (err)
1159                         retval = err;
1160                 unlock_new_inode(inode);
1161                 iput(inode);
1162                 goto out_failed;
1163         }
1164 
1165         unlock_new_inode(inode);
1166         d_instantiate(dentry, inode);
1167         retval = journal_end(&th);
1168 out_failed:
1169         reiserfs_write_unlock(parent_dir->i_sb);
1170         return retval;
1171 }
1172 
1173 static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
1174                          struct dentry *dentry)
1175 {
1176         int retval;
1177         struct inode *inode = d_inode(old_dentry);
1178         struct reiserfs_transaction_handle th;
1179         /*
1180          * We need blocks for transaction + update of quotas for
1181          * the owners of the directory
1182          */
1183         int jbegin_count =
1184             JOURNAL_PER_BALANCE_CNT * 3 +
1185             2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
1186 
1187         dquot_initialize(dir);
1188 
1189         reiserfs_write_lock(dir->i_sb);
1190         if (inode->i_nlink >= REISERFS_LINK_MAX) {
1191                 /* FIXME: sd_nlink is 32 bit for new files */
1192                 reiserfs_write_unlock(dir->i_sb);
1193                 return -EMLINK;
1194         }
1195 
1196         /* inc before scheduling so reiserfs_unlink knows we are here */
1197         inc_nlink(inode);
1198 
1199         retval = journal_begin(&th, dir->i_sb, jbegin_count);
1200         if (retval) {
1201                 drop_nlink(inode);
1202                 reiserfs_write_unlock(dir->i_sb);
1203                 return retval;
1204         }
1205 
1206         /* create new entry */
1207         retval =
1208             reiserfs_add_entry(&th, dir, dentry->d_name.name,
1209                                dentry->d_name.len, inode, 1 /*visible */ );
1210 
1211         reiserfs_update_inode_transaction(inode);
1212         reiserfs_update_inode_transaction(dir);
1213 
1214         if (retval) {
1215                 int err;
1216                 drop_nlink(inode);
1217                 err = journal_end(&th);
1218                 reiserfs_write_unlock(dir->i_sb);
1219                 return err ? err : retval;
1220         }
1221 
1222         inode->i_ctime = CURRENT_TIME_SEC;
1223         reiserfs_update_sd(&th, inode);
1224 
1225         ihold(inode);
1226         d_instantiate(dentry, inode);
1227         retval = journal_end(&th);
1228         reiserfs_write_unlock(dir->i_sb);
1229         return retval;
1230 }
1231 
1232 /* de contains information pointing to an entry which */
1233 static int de_still_valid(const char *name, int len,
1234                           struct reiserfs_dir_entry *de)
1235 {
1236         struct reiserfs_dir_entry tmp = *de;
1237 
1238         /* recalculate pointer to name and name length */
1239         set_de_name_and_namelen(&tmp);
1240         /* FIXME: could check more */
1241         if (tmp.de_namelen != len || memcmp(name, de->de_name, len))
1242                 return 0;
1243         return 1;
1244 }
1245 
1246 static int entry_points_to_object(const char *name, int len,
1247                                   struct reiserfs_dir_entry *de,
1248                                   struct inode *inode)
1249 {
1250         if (!de_still_valid(name, len, de))
1251                 return 0;
1252 
1253         if (inode) {
1254                 if (!de_visible(de->de_deh + de->de_entry_num))
1255                         reiserfs_panic(inode->i_sb, "vs-7042",
1256                                        "entry must be visible");
1257                 return (de->de_objectid == inode->i_ino) ? 1 : 0;
1258         }
1259 
1260         /* this must be added hidden entry */
1261         if (de_visible(de->de_deh + de->de_entry_num))
1262                 reiserfs_panic(NULL, "vs-7043", "entry must be visible");
1263 
1264         return 1;
1265 }
1266 
1267 /* sets key of objectid the entry has to point to */
1268 static void set_ino_in_dir_entry(struct reiserfs_dir_entry *de,
1269                                  struct reiserfs_key *key)
1270 {
1271         /* JDM These operations are endian safe - both are le */
1272         de->de_deh[de->de_entry_num].deh_dir_id = key->k_dir_id;
1273         de->de_deh[de->de_entry_num].deh_objectid = key->k_objectid;
1274 }
1275 
1276 /*
1277  * process, that is going to call fix_nodes/do_balance must hold only
1278  * one path. If it holds 2 or more, it can get into endless waiting in
1279  * get_empty_nodes or its clones
1280  */
1281 static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1282                            struct inode *new_dir, struct dentry *new_dentry)
1283 {
1284         int retval;
1285         INITIALIZE_PATH(old_entry_path);
1286         INITIALIZE_PATH(new_entry_path);
1287         INITIALIZE_PATH(dot_dot_entry_path);
1288         struct item_head new_entry_ih, old_entry_ih, dot_dot_ih;
1289         struct reiserfs_dir_entry old_de, new_de, dot_dot_de;
1290         struct inode *old_inode, *new_dentry_inode;
1291         struct reiserfs_transaction_handle th;
1292         int jbegin_count;
1293         umode_t old_inode_mode;
1294         unsigned long savelink = 1;
1295         struct timespec ctime;
1296 
1297         /*
1298          * three balancings: (1) old name removal, (2) new name insertion
1299          * and (3) maybe "save" link insertion
1300          * stat data updates: (1) old directory,
1301          * (2) new directory and (3) maybe old object stat data (when it is
1302          * directory) and (4) maybe stat data of object to which new entry
1303          * pointed initially and (5) maybe block containing ".." of
1304          * renamed directory
1305          * quota updates: two parent directories
1306          */
1307         jbegin_count =
1308             JOURNAL_PER_BALANCE_CNT * 3 + 5 +
1309             4 * REISERFS_QUOTA_TRANS_BLOCKS(old_dir->i_sb);
1310 
1311         dquot_initialize(old_dir);
1312         dquot_initialize(new_dir);
1313 
1314         old_inode = d_inode(old_dentry);
1315         new_dentry_inode = d_inode(new_dentry);
1316 
1317         /*
1318          * make sure that oldname still exists and points to an object we
1319          * are going to rename
1320          */
1321         old_de.de_gen_number_bit_string = NULL;
1322         reiserfs_write_lock(old_dir->i_sb);
1323         retval =
1324             reiserfs_find_entry(old_dir, old_dentry->d_name.name,
1325                                 old_dentry->d_name.len, &old_entry_path,
1326                                 &old_de);
1327         pathrelse(&old_entry_path);
1328         if (retval == IO_ERROR) {
1329                 reiserfs_write_unlock(old_dir->i_sb);
1330                 return -EIO;
1331         }
1332 
1333         if (retval != NAME_FOUND || old_de.de_objectid != old_inode->i_ino) {
1334                 reiserfs_write_unlock(old_dir->i_sb);
1335                 return -ENOENT;
1336         }
1337 
1338         old_inode_mode = old_inode->i_mode;
1339         if (S_ISDIR(old_inode_mode)) {
1340                 /*
1341                  * make sure that directory being renamed has correct ".."
1342                  * and that its new parent directory has not too many links
1343                  * already
1344                  */
1345                 if (new_dentry_inode) {
1346                         if (!reiserfs_empty_dir(new_dentry_inode)) {
1347                                 reiserfs_write_unlock(old_dir->i_sb);
1348                                 return -ENOTEMPTY;
1349                         }
1350                 }
1351 
1352                 /*
1353                  * directory is renamed, its parent directory will be changed,
1354                  * so find ".." entry
1355                  */
1356                 dot_dot_de.de_gen_number_bit_string = NULL;
1357                 retval =
1358                     reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path,
1359                                         &dot_dot_de);
1360                 pathrelse(&dot_dot_entry_path);
1361                 if (retval != NAME_FOUND) {
1362                         reiserfs_write_unlock(old_dir->i_sb);
1363                         return -EIO;
1364                 }
1365 
1366                 /* inode number of .. must equal old_dir->i_ino */
1367                 if (dot_dot_de.de_objectid != old_dir->i_ino) {
1368                         reiserfs_write_unlock(old_dir->i_sb);
1369                         return -EIO;
1370                 }
1371         }
1372 
1373         retval = journal_begin(&th, old_dir->i_sb, jbegin_count);
1374         if (retval) {
1375                 reiserfs_write_unlock(old_dir->i_sb);
1376                 return retval;
1377         }
1378 
1379         /* add new entry (or find the existing one) */
1380         retval =
1381             reiserfs_add_entry(&th, new_dir, new_dentry->d_name.name,
1382                                new_dentry->d_name.len, old_inode, 0);
1383         if (retval == -EEXIST) {
1384                 if (!new_dentry_inode) {
1385                         reiserfs_panic(old_dir->i_sb, "vs-7050",
1386                                        "new entry is found, new inode == 0");
1387                 }
1388         } else if (retval) {
1389                 int err = journal_end(&th);
1390                 reiserfs_write_unlock(old_dir->i_sb);
1391                 return err ? err : retval;
1392         }
1393 
1394         reiserfs_update_inode_transaction(old_dir);
1395         reiserfs_update_inode_transaction(new_dir);
1396 
1397         /*
1398          * this makes it so an fsync on an open fd for the old name will
1399          * commit the rename operation
1400          */
1401         reiserfs_update_inode_transaction(old_inode);
1402 
1403         if (new_dentry_inode)
1404                 reiserfs_update_inode_transaction(new_dentry_inode);
1405 
1406         while (1) {
1407                 /*
1408                  * look for old name using corresponding entry key
1409                  * (found by reiserfs_find_entry)
1410                  */
1411                 if ((retval =
1412                      search_by_entry_key(new_dir->i_sb, &old_de.de_entry_key,
1413                                          &old_entry_path,
1414                                          &old_de)) != NAME_FOUND) {
1415                         pathrelse(&old_entry_path);
1416                         journal_end(&th);
1417                         reiserfs_write_unlock(old_dir->i_sb);
1418                         return -EIO;
1419                 }
1420 
1421                 copy_item_head(&old_entry_ih, tp_item_head(&old_entry_path));
1422 
1423                 reiserfs_prepare_for_journal(old_inode->i_sb, old_de.de_bh, 1);
1424 
1425                 /* look for new name by reiserfs_find_entry */
1426                 new_de.de_gen_number_bit_string = NULL;
1427                 retval =
1428                     reiserfs_find_entry(new_dir, new_dentry->d_name.name,
1429                                         new_dentry->d_name.len, &new_entry_path,
1430                                         &new_de);
1431                 /*
1432                  * reiserfs_add_entry should not return IO_ERROR,
1433                  * because it is called with essentially same parameters from
1434                  * reiserfs_add_entry above, and we'll catch any i/o errors
1435                  * before we get here.
1436                  */
1437                 if (retval != NAME_FOUND_INVISIBLE && retval != NAME_FOUND) {
1438                         pathrelse(&new_entry_path);
1439                         pathrelse(&old_entry_path);
1440                         journal_end(&th);
1441                         reiserfs_write_unlock(old_dir->i_sb);
1442                         return -EIO;
1443                 }
1444 
1445                 copy_item_head(&new_entry_ih, tp_item_head(&new_entry_path));
1446 
1447                 reiserfs_prepare_for_journal(old_inode->i_sb, new_de.de_bh, 1);
1448 
1449                 if (S_ISDIR(old_inode->i_mode)) {
1450                         if ((retval =
1451                              search_by_entry_key(new_dir->i_sb,
1452                                                  &dot_dot_de.de_entry_key,
1453                                                  &dot_dot_entry_path,
1454                                                  &dot_dot_de)) != NAME_FOUND) {
1455                                 pathrelse(&dot_dot_entry_path);
1456                                 pathrelse(&new_entry_path);
1457                                 pathrelse(&old_entry_path);
1458                                 journal_end(&th);
1459                                 reiserfs_write_unlock(old_dir->i_sb);
1460                                 return -EIO;
1461                         }
1462                         copy_item_head(&dot_dot_ih,
1463                                        tp_item_head(&dot_dot_entry_path));
1464                         /* node containing ".." gets into transaction */
1465                         reiserfs_prepare_for_journal(old_inode->i_sb,
1466                                                      dot_dot_de.de_bh, 1);
1467                 }
1468                 /*
1469                  * we should check seals here, not do
1470                  * this stuff, yes? Then, having
1471                  * gathered everything into RAM we
1472                  * should lock the buffers, yes?  -Hans
1473                  */
1474                 /*
1475                  * probably.  our rename needs to hold more
1476                  * than one path at once.  The seals would
1477                  * have to be written to deal with multi-path
1478                  * issues -chris
1479                  */
1480                 /*
1481                  * sanity checking before doing the rename - avoid races many
1482                  * of the above checks could have scheduled.  We have to be
1483                  * sure our items haven't been shifted by another process.
1484                  */
1485                 if (item_moved(&new_entry_ih, &new_entry_path) ||
1486                     !entry_points_to_object(new_dentry->d_name.name,
1487                                             new_dentry->d_name.len,
1488                                             &new_de, new_dentry_inode) ||
1489                     item_moved(&old_entry_ih, &old_entry_path) ||
1490                     !entry_points_to_object(old_dentry->d_name.name,
1491                                             old_dentry->d_name.len,
1492                                             &old_de, old_inode)) {
1493                         reiserfs_restore_prepared_buffer(old_inode->i_sb,
1494                                                          new_de.de_bh);
1495                         reiserfs_restore_prepared_buffer(old_inode->i_sb,
1496                                                          old_de.de_bh);
1497                         if (S_ISDIR(old_inode_mode))
1498                                 reiserfs_restore_prepared_buffer(old_inode->
1499                                                                  i_sb,
1500                                                                  dot_dot_de.
1501                                                                  de_bh);
1502                         continue;
1503                 }
1504                 if (S_ISDIR(old_inode_mode)) {
1505                         if (item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
1506                             !entry_points_to_object("..", 2, &dot_dot_de,
1507                                                     old_dir)) {
1508                                 reiserfs_restore_prepared_buffer(old_inode->
1509                                                                  i_sb,
1510                                                                  old_de.de_bh);
1511                                 reiserfs_restore_prepared_buffer(old_inode->
1512                                                                  i_sb,
1513                                                                  new_de.de_bh);
1514                                 reiserfs_restore_prepared_buffer(old_inode->
1515                                                                  i_sb,
1516                                                                  dot_dot_de.
1517                                                                  de_bh);
1518                                 continue;
1519                         }
1520                 }
1521 
1522                 RFALSE(S_ISDIR(old_inode_mode) &&
1523                        !buffer_journal_prepared(dot_dot_de.de_bh), "");
1524 
1525                 break;
1526         }
1527 
1528         /*
1529          * ok, all the changes can be done in one fell swoop when we
1530          * have claimed all the buffers needed.
1531          */
1532 
1533         mark_de_visible(new_de.de_deh + new_de.de_entry_num);
1534         set_ino_in_dir_entry(&new_de, INODE_PKEY(old_inode));
1535         journal_mark_dirty(&th, new_de.de_bh);
1536 
1537         mark_de_hidden(old_de.de_deh + old_de.de_entry_num);
1538         journal_mark_dirty(&th, old_de.de_bh);
1539         ctime = CURRENT_TIME_SEC;
1540         old_dir->i_ctime = old_dir->i_mtime = ctime;
1541         new_dir->i_ctime = new_dir->i_mtime = ctime;
1542         /*
1543          * thanks to Alex Adriaanse <alex_a@caltech.edu> for patch
1544          * which adds ctime update of renamed object
1545          */
1546         old_inode->i_ctime = ctime;
1547 
1548         if (new_dentry_inode) {
1549                 /* adjust link number of the victim */
1550                 if (S_ISDIR(new_dentry_inode->i_mode)) {
1551                         clear_nlink(new_dentry_inode);
1552                 } else {
1553                         drop_nlink(new_dentry_inode);
1554                 }
1555                 new_dentry_inode->i_ctime = ctime;
1556                 savelink = new_dentry_inode->i_nlink;
1557         }
1558 
1559         if (S_ISDIR(old_inode_mode)) {
1560                 /* adjust ".." of renamed directory */
1561                 set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir));
1562                 journal_mark_dirty(&th, dot_dot_de.de_bh);
1563 
1564                 /*
1565                  * there (in new_dir) was no directory, so it got new link
1566                  * (".."  of renamed directory)
1567                  */
1568                 if (!new_dentry_inode)
1569                         INC_DIR_INODE_NLINK(new_dir);
1570 
1571                 /* old directory lost one link - ".. " of renamed directory */
1572                 DEC_DIR_INODE_NLINK(old_dir);
1573         }
1574         /*
1575          * looks like in 2.3.99pre3 brelse is atomic.
1576          * so we can use pathrelse
1577          */
1578         pathrelse(&new_entry_path);
1579         pathrelse(&dot_dot_entry_path);
1580 
1581         /*
1582          * FIXME: this reiserfs_cut_from_item's return value may screw up
1583          * anybody, but it will panic if will not be able to find the
1584          * entry. This needs one more clean up
1585          */
1586         if (reiserfs_cut_from_item
1587             (&th, &old_entry_path, &old_de.de_entry_key, old_dir, NULL,
1588              0) < 0)
1589                 reiserfs_error(old_dir->i_sb, "vs-7060",
1590                                "couldn't not cut old name. Fsck later?");
1591 
1592         old_dir->i_size -= DEH_SIZE + old_de.de_entrylen;
1593 
1594         reiserfs_update_sd(&th, old_dir);
1595         reiserfs_update_sd(&th, new_dir);
1596         reiserfs_update_sd(&th, old_inode);
1597 
1598         if (new_dentry_inode) {
1599                 if (savelink == 0)
1600                         add_save_link(&th, new_dentry_inode,
1601                                       0 /* not truncate */ );
1602                 reiserfs_update_sd(&th, new_dentry_inode);
1603         }
1604 
1605         retval = journal_end(&th);
1606         reiserfs_write_unlock(old_dir->i_sb);
1607         return retval;
1608 }
1609 
1610 /* directories can handle most operations...  */
1611 const struct inode_operations reiserfs_dir_inode_operations = {
1612         .create = reiserfs_create,
1613         .lookup = reiserfs_lookup,
1614         .link = reiserfs_link,
1615         .unlink = reiserfs_unlink,
1616         .symlink = reiserfs_symlink,
1617         .mkdir = reiserfs_mkdir,
1618         .rmdir = reiserfs_rmdir,
1619         .mknod = reiserfs_mknod,
1620         .rename = reiserfs_rename,
1621         .setattr = reiserfs_setattr,
1622         .setxattr = reiserfs_setxattr,
1623         .getxattr = reiserfs_getxattr,
1624         .listxattr = reiserfs_listxattr,
1625         .removexattr = reiserfs_removexattr,
1626         .permission = reiserfs_permission,
1627         .get_acl = reiserfs_get_acl,
1628         .set_acl = reiserfs_set_acl,
1629 };
1630 
1631 /*
1632  * symlink operations.. same as page_symlink_inode_operations, with xattr
1633  * stuff added
1634  */
1635 const struct inode_operations reiserfs_symlink_inode_operations = {
1636         .readlink = generic_readlink,
1637         .follow_link = page_follow_link_light,
1638         .put_link = page_put_link,
1639         .setattr = reiserfs_setattr,
1640         .setxattr = reiserfs_setxattr,
1641         .getxattr = reiserfs_getxattr,
1642         .listxattr = reiserfs_listxattr,
1643         .removexattr = reiserfs_removexattr,
1644         .permission = reiserfs_permission,
1645 };
1646 
1647 /*
1648  * special file operations.. just xattr/acl stuff
1649  */
1650 const struct inode_operations reiserfs_special_inode_operations = {
1651         .setattr = reiserfs_setattr,
1652         .setxattr = reiserfs_setxattr,
1653         .getxattr = reiserfs_getxattr,
1654         .listxattr = reiserfs_listxattr,
1655         .removexattr = reiserfs_removexattr,
1656         .permission = reiserfs_permission,
1657         .get_acl = reiserfs_get_acl,
1658         .set_acl = reiserfs_set_acl,
1659 };
1660 

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