reiserfs: rework reiserfs_panic
[linux-2.6.git] / fs / reiserfs / stree.c
1 /*
2  *  Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3  */
4
5 /*
6  *  Written by Anatoly P. Pinchuk pap@namesys.botik.ru
7  *  Programm System Institute
8  *  Pereslavl-Zalessky Russia
9  */
10
11 /*
12  *  This file contains functions dealing with S+tree
13  *
14  * B_IS_IN_TREE
15  * copy_item_head
16  * comp_short_keys
17  * comp_keys
18  * comp_short_le_keys
19  * le_key2cpu_key
20  * comp_le_keys
21  * bin_search
22  * get_lkey
23  * get_rkey
24  * key_in_buffer
25  * decrement_bcount
26  * decrement_counters_in_path
27  * reiserfs_check_path
28  * pathrelse_and_restore
29  * pathrelse
30  * search_by_key_reada
31  * search_by_key
32  * search_for_position_by_key
33  * comp_items
34  * prepare_for_direct_item
35  * prepare_for_direntry_item
36  * prepare_for_delete_or_cut
37  * calc_deleted_bytes_number
38  * init_tb_struct
39  * padd_item
40  * reiserfs_delete_item
41  * reiserfs_delete_solid_item
42  * reiserfs_delete_object
43  * maybe_indirect_to_direct
44  * indirect_to_direct_roll_back
45  * reiserfs_cut_from_item
46  * truncate_directory
47  * reiserfs_do_truncate
48  * reiserfs_paste_into_item
49  * reiserfs_insert_item
50  */
51
52 #include <linux/time.h>
53 #include <linux/string.h>
54 #include <linux/pagemap.h>
55 #include <linux/reiserfs_fs.h>
56 #include <linux/buffer_head.h>
57 #include <linux/quotaops.h>
58
59 /* Does the buffer contain a disk block which is in the tree. */
60 inline int B_IS_IN_TREE(const struct buffer_head *p_s_bh)
61 {
62
63         RFALSE(B_LEVEL(p_s_bh) > MAX_HEIGHT,
64                "PAP-1010: block (%b) has too big level (%z)", p_s_bh, p_s_bh);
65
66         return (B_LEVEL(p_s_bh) != FREE_LEVEL);
67 }
68
69 //
70 // to gets item head in le form
71 //
72 inline void copy_item_head(struct item_head *p_v_to,
73                            const struct item_head *p_v_from)
74 {
75         memcpy(p_v_to, p_v_from, IH_SIZE);
76 }
77
78 /* k1 is pointer to on-disk structure which is stored in little-endian
79    form. k2 is pointer to cpu variable. For key of items of the same
80    object this returns 0.
81    Returns: -1 if key1 < key2 
82    0 if key1 == key2
83    1 if key1 > key2 */
84 inline int comp_short_keys(const struct reiserfs_key *le_key,
85                            const struct cpu_key *cpu_key)
86 {
87         __u32 n;
88         n = le32_to_cpu(le_key->k_dir_id);
89         if (n < cpu_key->on_disk_key.k_dir_id)
90                 return -1;
91         if (n > cpu_key->on_disk_key.k_dir_id)
92                 return 1;
93         n = le32_to_cpu(le_key->k_objectid);
94         if (n < cpu_key->on_disk_key.k_objectid)
95                 return -1;
96         if (n > cpu_key->on_disk_key.k_objectid)
97                 return 1;
98         return 0;
99 }
100
101 /* k1 is pointer to on-disk structure which is stored in little-endian
102    form. k2 is pointer to cpu variable.
103    Compare keys using all 4 key fields.
104    Returns: -1 if key1 < key2 0
105    if key1 = key2 1 if key1 > key2 */
106 static inline int comp_keys(const struct reiserfs_key *le_key,
107                             const struct cpu_key *cpu_key)
108 {
109         int retval;
110
111         retval = comp_short_keys(le_key, cpu_key);
112         if (retval)
113                 return retval;
114         if (le_key_k_offset(le_key_version(le_key), le_key) <
115             cpu_key_k_offset(cpu_key))
116                 return -1;
117         if (le_key_k_offset(le_key_version(le_key), le_key) >
118             cpu_key_k_offset(cpu_key))
119                 return 1;
120
121         if (cpu_key->key_length == 3)
122                 return 0;
123
124         /* this part is needed only when tail conversion is in progress */
125         if (le_key_k_type(le_key_version(le_key), le_key) <
126             cpu_key_k_type(cpu_key))
127                 return -1;
128
129         if (le_key_k_type(le_key_version(le_key), le_key) >
130             cpu_key_k_type(cpu_key))
131                 return 1;
132
133         return 0;
134 }
135
136 inline int comp_short_le_keys(const struct reiserfs_key *key1,
137                               const struct reiserfs_key *key2)
138 {
139         __u32 *p_s_1_u32, *p_s_2_u32;
140         int n_key_length = REISERFS_SHORT_KEY_LEN;
141
142         p_s_1_u32 = (__u32 *) key1;
143         p_s_2_u32 = (__u32 *) key2;
144         for (; n_key_length--; ++p_s_1_u32, ++p_s_2_u32) {
145                 if (le32_to_cpu(*p_s_1_u32) < le32_to_cpu(*p_s_2_u32))
146                         return -1;
147                 if (le32_to_cpu(*p_s_1_u32) > le32_to_cpu(*p_s_2_u32))
148                         return 1;
149         }
150         return 0;
151 }
152
153 inline void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from)
154 {
155         int version;
156         to->on_disk_key.k_dir_id = le32_to_cpu(from->k_dir_id);
157         to->on_disk_key.k_objectid = le32_to_cpu(from->k_objectid);
158
159         // find out version of the key
160         version = le_key_version(from);
161         to->version = version;
162         to->on_disk_key.k_offset = le_key_k_offset(version, from);
163         to->on_disk_key.k_type = le_key_k_type(version, from);
164 }
165
166 // this does not say which one is bigger, it only returns 1 if keys
167 // are not equal, 0 otherwise
168 inline int comp_le_keys(const struct reiserfs_key *k1,
169                         const struct reiserfs_key *k2)
170 {
171         return memcmp(k1, k2, sizeof(struct reiserfs_key));
172 }
173
174 /**************************************************************************
175  *  Binary search toolkit function                                        *
176  *  Search for an item in the array by the item key                       *
177  *  Returns:    1 if found,  0 if not found;                              *
178  *        *p_n_pos = number of the searched element if found, else the    *
179  *        number of the first element that is larger than p_v_key.        *
180  **************************************************************************/
181 /* For those not familiar with binary search: n_lbound is the leftmost item that it
182  could be, n_rbound the rightmost item that it could be.  We examine the item
183  halfway between n_lbound and n_rbound, and that tells us either that we can increase
184  n_lbound, or decrease n_rbound, or that we have found it, or if n_lbound <= n_rbound that
185  there are no possible items, and we have not found it. With each examination we
186  cut the number of possible items it could be by one more than half rounded down,
187  or we find it. */
188 static inline int bin_search(const void *p_v_key,       /* Key to search for.                   */
189                              const void *p_v_base,      /* First item in the array.             */
190                              int p_n_num,       /* Number of items in the array.        */
191                              int p_n_width,     /* Item size in the array.
192                                                    searched. Lest the reader be
193                                                    confused, note that this is crafted
194                                                    as a general function, and when it
195                                                    is applied specifically to the array
196                                                    of item headers in a node, p_n_width
197                                                    is actually the item header size not
198                                                    the item size.                      */
199                              int *p_n_pos       /* Number of the searched for element. */
200     )
201 {
202         int n_rbound, n_lbound, n_j;
203
204         for (n_j = ((n_rbound = p_n_num - 1) + (n_lbound = 0)) / 2;
205              n_lbound <= n_rbound; n_j = (n_rbound + n_lbound) / 2)
206                 switch (comp_keys
207                         ((struct reiserfs_key *)((char *)p_v_base +
208                                                  n_j * p_n_width),
209                          (struct cpu_key *)p_v_key)) {
210                 case -1:
211                         n_lbound = n_j + 1;
212                         continue;
213                 case 1:
214                         n_rbound = n_j - 1;
215                         continue;
216                 case 0:
217                         *p_n_pos = n_j;
218                         return ITEM_FOUND;      /* Key found in the array.  */
219                 }
220
221         /* bin_search did not find given key, it returns position of key,
222            that is minimal and greater than the given one. */
223         *p_n_pos = n_lbound;
224         return ITEM_NOT_FOUND;
225 }
226
227 #ifdef CONFIG_REISERFS_CHECK
228 extern struct tree_balance *cur_tb;
229 #endif
230
231 /* Minimal possible key. It is never in the tree. */
232 const struct reiserfs_key MIN_KEY = { 0, 0, {{0, 0},} };
233
234 /* Maximal possible key. It is never in the tree. */
235 static const struct reiserfs_key MAX_KEY = {
236         __constant_cpu_to_le32(0xffffffff),
237         __constant_cpu_to_le32(0xffffffff),
238         {{__constant_cpu_to_le32(0xffffffff),
239           __constant_cpu_to_le32(0xffffffff)},}
240 };
241
242 /* Get delimiting key of the buffer by looking for it in the buffers in the path, starting from the bottom
243    of the path, and going upwards.  We must check the path's validity at each step.  If the key is not in
244    the path, there is no delimiting key in the tree (buffer is first or last buffer in tree), and in this
245    case we return a special key, either MIN_KEY or MAX_KEY. */
246 static inline const struct reiserfs_key *get_lkey(const struct treepath
247                                                   *p_s_chk_path,
248                                                   const struct super_block
249                                                   *p_s_sb)
250 {
251         int n_position, n_path_offset = p_s_chk_path->path_length;
252         struct buffer_head *p_s_parent;
253
254         RFALSE(n_path_offset < FIRST_PATH_ELEMENT_OFFSET,
255                "PAP-5010: invalid offset in the path");
256
257         /* While not higher in path than first element. */
258         while (n_path_offset-- > FIRST_PATH_ELEMENT_OFFSET) {
259
260                 RFALSE(!buffer_uptodate
261                        (PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset)),
262                        "PAP-5020: parent is not uptodate");
263
264                 /* Parent at the path is not in the tree now. */
265                 if (!B_IS_IN_TREE
266                     (p_s_parent =
267                      PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset)))
268                         return &MAX_KEY;
269                 /* Check whether position in the parent is correct. */
270                 if ((n_position =
271                      PATH_OFFSET_POSITION(p_s_chk_path,
272                                           n_path_offset)) >
273                     B_NR_ITEMS(p_s_parent))
274                         return &MAX_KEY;
275                 /* Check whether parent at the path really points to the child. */
276                 if (B_N_CHILD_NUM(p_s_parent, n_position) !=
277                     PATH_OFFSET_PBUFFER(p_s_chk_path,
278                                         n_path_offset + 1)->b_blocknr)
279                         return &MAX_KEY;
280                 /* Return delimiting key if position in the parent is not equal to zero. */
281                 if (n_position)
282                         return B_N_PDELIM_KEY(p_s_parent, n_position - 1);
283         }
284         /* Return MIN_KEY if we are in the root of the buffer tree. */
285         if (PATH_OFFSET_PBUFFER(p_s_chk_path, FIRST_PATH_ELEMENT_OFFSET)->
286             b_blocknr == SB_ROOT_BLOCK(p_s_sb))
287                 return &MIN_KEY;
288         return &MAX_KEY;
289 }
290
291 /* Get delimiting key of the buffer at the path and its right neighbor. */
292 inline const struct reiserfs_key *get_rkey(const struct treepath *p_s_chk_path,
293                                            const struct super_block *p_s_sb)
294 {
295         int n_position, n_path_offset = p_s_chk_path->path_length;
296         struct buffer_head *p_s_parent;
297
298         RFALSE(n_path_offset < FIRST_PATH_ELEMENT_OFFSET,
299                "PAP-5030: invalid offset in the path");
300
301         while (n_path_offset-- > FIRST_PATH_ELEMENT_OFFSET) {
302
303                 RFALSE(!buffer_uptodate
304                        (PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset)),
305                        "PAP-5040: parent is not uptodate");
306
307                 /* Parent at the path is not in the tree now. */
308                 if (!B_IS_IN_TREE
309                     (p_s_parent =
310                      PATH_OFFSET_PBUFFER(p_s_chk_path, n_path_offset)))
311                         return &MIN_KEY;
312                 /* Check whether position in the parent is correct. */
313                 if ((n_position =
314                      PATH_OFFSET_POSITION(p_s_chk_path,
315                                           n_path_offset)) >
316                     B_NR_ITEMS(p_s_parent))
317                         return &MIN_KEY;
318                 /* Check whether parent at the path really points to the child. */
319                 if (B_N_CHILD_NUM(p_s_parent, n_position) !=
320                     PATH_OFFSET_PBUFFER(p_s_chk_path,
321                                         n_path_offset + 1)->b_blocknr)
322                         return &MIN_KEY;
323                 /* Return delimiting key if position in the parent is not the last one. */
324                 if (n_position != B_NR_ITEMS(p_s_parent))
325                         return B_N_PDELIM_KEY(p_s_parent, n_position);
326         }
327         /* Return MAX_KEY if we are in the root of the buffer tree. */
328         if (PATH_OFFSET_PBUFFER(p_s_chk_path, FIRST_PATH_ELEMENT_OFFSET)->
329             b_blocknr == SB_ROOT_BLOCK(p_s_sb))
330                 return &MAX_KEY;
331         return &MIN_KEY;
332 }
333
334 /* Check whether a key is contained in the tree rooted from a buffer at a path. */
335 /* This works by looking at the left and right delimiting keys for the buffer in the last path_element in
336    the path.  These delimiting keys are stored at least one level above that buffer in the tree. If the
337    buffer is the first or last node in the tree order then one of the delimiting keys may be absent, and in
338    this case get_lkey and get_rkey return a special key which is MIN_KEY or MAX_KEY. */
339 static inline int key_in_buffer(struct treepath *p_s_chk_path,  /* Path which should be checked.  */
340                                 const struct cpu_key *p_s_key,  /* Key which should be checked.   */
341                                 struct super_block *p_s_sb      /* Super block pointer.           */
342     )
343 {
344
345         RFALSE(!p_s_key || p_s_chk_path->path_length < FIRST_PATH_ELEMENT_OFFSET
346                || p_s_chk_path->path_length > MAX_HEIGHT,
347                "PAP-5050: pointer to the key(%p) is NULL or invalid path length(%d)",
348                p_s_key, p_s_chk_path->path_length);
349         RFALSE(!PATH_PLAST_BUFFER(p_s_chk_path)->b_bdev,
350                "PAP-5060: device must not be NODEV");
351
352         if (comp_keys(get_lkey(p_s_chk_path, p_s_sb), p_s_key) == 1)
353                 /* left delimiting key is bigger, that the key we look for */
354                 return 0;
355         //  if ( comp_keys(p_s_key, get_rkey(p_s_chk_path, p_s_sb)) != -1 )
356         if (comp_keys(get_rkey(p_s_chk_path, p_s_sb), p_s_key) != 1)
357                 /* p_s_key must be less than right delimitiing key */
358                 return 0;
359         return 1;
360 }
361
362 inline void decrement_bcount(struct buffer_head *p_s_bh)
363 {
364         if (p_s_bh) {
365                 if (atomic_read(&(p_s_bh->b_count))) {
366                         put_bh(p_s_bh);
367                         return;
368                 }
369                 reiserfs_panic(NULL, "PAP-5070",
370                                "trying to free free buffer %b", p_s_bh);
371         }
372 }
373
374 /* Decrement b_count field of the all buffers in the path. */
375 void decrement_counters_in_path(struct treepath *p_s_search_path)
376 {
377         int n_path_offset = p_s_search_path->path_length;
378
379         RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET ||
380                n_path_offset > EXTENDED_MAX_HEIGHT - 1,
381                "PAP-5080: invalid path offset of %d", n_path_offset);
382
383         while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) {
384                 struct buffer_head *bh;
385
386                 bh = PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--);
387                 decrement_bcount(bh);
388         }
389         p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
390 }
391
392 int reiserfs_check_path(struct treepath *p)
393 {
394         RFALSE(p->path_length != ILLEGAL_PATH_ELEMENT_OFFSET,
395                "path not properly relsed");
396         return 0;
397 }
398
399 /* Release all buffers in the path. Restore dirty bits clean
400 ** when preparing the buffer for the log
401 **
402 ** only called from fix_nodes()
403 */
404 void pathrelse_and_restore(struct super_block *s, struct treepath *p_s_search_path)
405 {
406         int n_path_offset = p_s_search_path->path_length;
407
408         RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET,
409                "clm-4000: invalid path offset");
410
411         while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) {
412                 reiserfs_restore_prepared_buffer(s,
413                                                  PATH_OFFSET_PBUFFER
414                                                  (p_s_search_path,
415                                                   n_path_offset));
416                 brelse(PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--));
417         }
418         p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
419 }
420
421 /* Release all buffers in the path. */
422 void pathrelse(struct treepath *p_s_search_path)
423 {
424         int n_path_offset = p_s_search_path->path_length;
425
426         RFALSE(n_path_offset < ILLEGAL_PATH_ELEMENT_OFFSET,
427                "PAP-5090: invalid path offset");
428
429         while (n_path_offset > ILLEGAL_PATH_ELEMENT_OFFSET)
430                 brelse(PATH_OFFSET_PBUFFER(p_s_search_path, n_path_offset--));
431
432         p_s_search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
433 }
434
435 static int is_leaf(char *buf, int blocksize, struct buffer_head *bh)
436 {
437         struct block_head *blkh;
438         struct item_head *ih;
439         int used_space;
440         int prev_location;
441         int i;
442         int nr;
443
444         blkh = (struct block_head *)buf;
445         if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) {
446                 reiserfs_warning(NULL, "reiserfs-5080",
447                                  "this should be caught earlier");
448                 return 0;
449         }
450
451         nr = blkh_nr_item(blkh);
452         if (nr < 1 || nr > ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) {
453                 /* item number is too big or too small */
454                 reiserfs_warning(NULL, "reiserfs-5081",
455                                  "nr_item seems wrong: %z", bh);
456                 return 0;
457         }
458         ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1;
459         used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih));
460         if (used_space != blocksize - blkh_free_space(blkh)) {
461                 /* free space does not match to calculated amount of use space */
462                 reiserfs_warning(NULL, "reiserfs-5082",
463                                  "free space seems wrong: %z", bh);
464                 return 0;
465         }
466         // FIXME: it is_leaf will hit performance too much - we may have
467         // return 1 here
468
469         /* check tables of item heads */
470         ih = (struct item_head *)(buf + BLKH_SIZE);
471         prev_location = blocksize;
472         for (i = 0; i < nr; i++, ih++) {
473                 if (le_ih_k_type(ih) == TYPE_ANY) {
474                         reiserfs_warning(NULL, "reiserfs-5083",
475                                          "wrong item type for item %h",
476                                          ih);
477                         return 0;
478                 }
479                 if (ih_location(ih) >= blocksize
480                     || ih_location(ih) < IH_SIZE * nr) {
481                         reiserfs_warning(NULL, "reiserfs-5084",
482                                          "item location seems wrong: %h",
483                                          ih);
484                         return 0;
485                 }
486                 if (ih_item_len(ih) < 1
487                     || ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) {
488                         reiserfs_warning(NULL, "reiserfs-5085",
489                                          "item length seems wrong: %h",
490                                          ih);
491                         return 0;
492                 }
493                 if (prev_location - ih_location(ih) != ih_item_len(ih)) {
494                         reiserfs_warning(NULL, "reiserfs-5086",
495                                          "item location seems wrong "
496                                          "(second one): %h", ih);
497                         return 0;
498                 }
499                 prev_location = ih_location(ih);
500         }
501
502         // one may imagine much more checks
503         return 1;
504 }
505
506 /* returns 1 if buf looks like an internal node, 0 otherwise */
507 static int is_internal(char *buf, int blocksize, struct buffer_head *bh)
508 {
509         struct block_head *blkh;
510         int nr;
511         int used_space;
512
513         blkh = (struct block_head *)buf;
514         nr = blkh_level(blkh);
515         if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) {
516                 /* this level is not possible for internal nodes */
517                 reiserfs_warning(NULL, "reiserfs-5087",
518                                  "this should be caught earlier");
519                 return 0;
520         }
521
522         nr = blkh_nr_item(blkh);
523         if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) {
524                 /* for internal which is not root we might check min number of keys */
525                 reiserfs_warning(NULL, "reiserfs-5088",
526                                  "number of key seems wrong: %z", bh);
527                 return 0;
528         }
529
530         used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1);
531         if (used_space != blocksize - blkh_free_space(blkh)) {
532                 reiserfs_warning(NULL, "reiserfs-5089",
533                                  "free space seems wrong: %z", bh);
534                 return 0;
535         }
536         // one may imagine much more checks
537         return 1;
538 }
539
540 // make sure that bh contains formatted node of reiserfs tree of
541 // 'level'-th level
542 static int is_tree_node(struct buffer_head *bh, int level)
543 {
544         if (B_LEVEL(bh) != level) {
545                 reiserfs_warning(NULL, "reiserfs-5090", "node level %d does "
546                                  "not match to the expected one %d",
547                                  B_LEVEL(bh), level);
548                 return 0;
549         }
550         if (level == DISK_LEAF_NODE_LEVEL)
551                 return is_leaf(bh->b_data, bh->b_size, bh);
552
553         return is_internal(bh->b_data, bh->b_size, bh);
554 }
555
556 #define SEARCH_BY_KEY_READA 16
557
558 /* The function is NOT SCHEDULE-SAFE! */
559 static void search_by_key_reada(struct super_block *s,
560                                 struct buffer_head **bh,
561                                 b_blocknr_t *b, int num)
562 {
563         int i, j;
564
565         for (i = 0; i < num; i++) {
566                 bh[i] = sb_getblk(s, b[i]);
567         }
568         for (j = 0; j < i; j++) {
569                 /*
570                  * note, this needs attention if we are getting rid of the BKL
571                  * you have to make sure the prepared bit isn't set on this buffer
572                  */
573                 if (!buffer_uptodate(bh[j]))
574                         ll_rw_block(READA, 1, bh + j);
575                 brelse(bh[j]);
576         }
577 }
578
579 /**************************************************************************
580  * Algorithm   SearchByKey                                                *
581  *             look for item in the Disk S+Tree by its key                *
582  * Input:  p_s_sb   -  super block                                        *
583  *         p_s_key  - pointer to the key to search                        *
584  * Output: ITEM_FOUND, ITEM_NOT_FOUND or IO_ERROR                         *
585  *         p_s_search_path - path from the root to the needed leaf        *
586  **************************************************************************/
587
588 /* This function fills up the path from the root to the leaf as it
589    descends the tree looking for the key.  It uses reiserfs_bread to
590    try to find buffers in the cache given their block number.  If it
591    does not find them in the cache it reads them from disk.  For each
592    node search_by_key finds using reiserfs_bread it then uses
593    bin_search to look through that node.  bin_search will find the
594    position of the block_number of the next node if it is looking
595    through an internal node.  If it is looking through a leaf node
596    bin_search will find the position of the item which has key either
597    equal to given key, or which is the maximal key less than the given
598    key.  search_by_key returns a path that must be checked for the
599    correctness of the top of the path but need not be checked for the
600    correctness of the bottom of the path */
601 /* The function is NOT SCHEDULE-SAFE! */
602 int search_by_key(struct super_block *p_s_sb, const struct cpu_key *p_s_key,    /* Key to search. */
603                   struct treepath *p_s_search_path,/* This structure was
604                                                    allocated and initialized
605                                                    by the calling
606                                                    function. It is filled up
607                                                    by this function.  */
608                   int n_stop_level      /* How far down the tree to search. To
609                                            stop at leaf level - set to
610                                            DISK_LEAF_NODE_LEVEL */
611     )
612 {
613         b_blocknr_t n_block_number;
614         int expected_level;
615         struct buffer_head *p_s_bh;
616         struct path_element *p_s_last_element;
617         int n_node_level, n_retval;
618         int right_neighbor_of_leaf_node;
619         int fs_gen;
620         struct buffer_head *reada_bh[SEARCH_BY_KEY_READA];
621         b_blocknr_t reada_blocks[SEARCH_BY_KEY_READA];
622         int reada_count = 0;
623
624 #ifdef CONFIG_REISERFS_CHECK
625         int n_repeat_counter = 0;
626 #endif
627
628         PROC_INFO_INC(p_s_sb, search_by_key);
629
630         /* As we add each node to a path we increase its count.  This means that
631            we must be careful to release all nodes in a path before we either
632            discard the path struct or re-use the path struct, as we do here. */
633
634         decrement_counters_in_path(p_s_search_path);
635
636         right_neighbor_of_leaf_node = 0;
637
638         /* With each iteration of this loop we search through the items in the
639            current node, and calculate the next current node(next path element)
640            for the next iteration of this loop.. */
641         n_block_number = SB_ROOT_BLOCK(p_s_sb);
642         expected_level = -1;
643         while (1) {
644
645 #ifdef CONFIG_REISERFS_CHECK
646                 if (!(++n_repeat_counter % 50000))
647                         reiserfs_warning(p_s_sb, "PAP-5100",
648                                          "%s: there were %d iterations of "
649                                          "while loop looking for key %K",
650                                          current->comm, n_repeat_counter,
651                                          p_s_key);
652 #endif
653
654                 /* prep path to have another element added to it. */
655                 p_s_last_element =
656                     PATH_OFFSET_PELEMENT(p_s_search_path,
657                                          ++p_s_search_path->path_length);
658                 fs_gen = get_generation(p_s_sb);
659
660                 /* Read the next tree node, and set the last element in the path to
661                    have a pointer to it. */
662                 if ((p_s_bh = p_s_last_element->pe_buffer =
663                      sb_getblk(p_s_sb, n_block_number))) {
664                         if (!buffer_uptodate(p_s_bh) && reada_count > 1) {
665                                 search_by_key_reada(p_s_sb, reada_bh,
666                                                     reada_blocks, reada_count);
667                         }
668                         ll_rw_block(READ, 1, &p_s_bh);
669                         wait_on_buffer(p_s_bh);
670                         if (!buffer_uptodate(p_s_bh))
671                                 goto io_error;
672                 } else {
673                       io_error:
674                         p_s_search_path->path_length--;
675                         pathrelse(p_s_search_path);
676                         return IO_ERROR;
677                 }
678                 reada_count = 0;
679                 if (expected_level == -1)
680                         expected_level = SB_TREE_HEIGHT(p_s_sb);
681                 expected_level--;
682
683                 /* It is possible that schedule occurred. We must check whether the key
684                    to search is still in the tree rooted from the current buffer. If
685                    not then repeat search from the root. */
686                 if (fs_changed(fs_gen, p_s_sb) &&
687                     (!B_IS_IN_TREE(p_s_bh) ||
688                      B_LEVEL(p_s_bh) != expected_level ||
689                      !key_in_buffer(p_s_search_path, p_s_key, p_s_sb))) {
690                         PROC_INFO_INC(p_s_sb, search_by_key_fs_changed);
691                         PROC_INFO_INC(p_s_sb, search_by_key_restarted);
692                         PROC_INFO_INC(p_s_sb,
693                                       sbk_restarted[expected_level - 1]);
694                         decrement_counters_in_path(p_s_search_path);
695
696                         /* Get the root block number so that we can repeat the search
697                            starting from the root. */
698                         n_block_number = SB_ROOT_BLOCK(p_s_sb);
699                         expected_level = -1;
700                         right_neighbor_of_leaf_node = 0;
701
702                         /* repeat search from the root */
703                         continue;
704                 }
705
706                 /* only check that the key is in the buffer if p_s_key is not
707                    equal to the MAX_KEY. Latter case is only possible in
708                    "finish_unfinished()" processing during mount. */
709                 RFALSE(comp_keys(&MAX_KEY, p_s_key) &&
710                        !key_in_buffer(p_s_search_path, p_s_key, p_s_sb),
711                        "PAP-5130: key is not in the buffer");
712 #ifdef CONFIG_REISERFS_CHECK
713                 if (cur_tb) {
714                         print_cur_tb("5140");
715                         reiserfs_panic(p_s_sb, "PAP-5140",
716                                        "schedule occurred in do_balance!");
717                 }
718 #endif
719
720                 // make sure, that the node contents look like a node of
721                 // certain level
722                 if (!is_tree_node(p_s_bh, expected_level)) {
723                         reiserfs_warning(p_s_sb, "vs-5150",
724                                          "invalid format found in block %ld. "
725                                          "Fsck?", p_s_bh->b_blocknr);
726                         pathrelse(p_s_search_path);
727                         return IO_ERROR;
728                 }
729
730                 /* ok, we have acquired next formatted node in the tree */
731                 n_node_level = B_LEVEL(p_s_bh);
732
733                 PROC_INFO_BH_STAT(p_s_sb, p_s_bh, n_node_level - 1);
734
735                 RFALSE(n_node_level < n_stop_level,
736                        "vs-5152: tree level (%d) is less than stop level (%d)",
737                        n_node_level, n_stop_level);
738
739                 n_retval = bin_search(p_s_key, B_N_PITEM_HEAD(p_s_bh, 0),
740                                       B_NR_ITEMS(p_s_bh),
741                                       (n_node_level ==
742                                        DISK_LEAF_NODE_LEVEL) ? IH_SIZE :
743                                       KEY_SIZE,
744                                       &(p_s_last_element->pe_position));
745                 if (n_node_level == n_stop_level) {
746                         return n_retval;
747                 }
748
749                 /* we are not in the stop level */
750                 if (n_retval == ITEM_FOUND)
751                         /* item has been found, so we choose the pointer which is to the right of the found one */
752                         p_s_last_element->pe_position++;
753
754                 /* if item was not found we choose the position which is to
755                    the left of the found item. This requires no code,
756                    bin_search did it already. */
757
758                 /* So we have chosen a position in the current node which is
759                    an internal node.  Now we calculate child block number by
760                    position in the node. */
761                 n_block_number =
762                     B_N_CHILD_NUM(p_s_bh, p_s_last_element->pe_position);
763
764                 /* if we are going to read leaf nodes, try for read ahead as well */
765                 if ((p_s_search_path->reada & PATH_READA) &&
766                     n_node_level == DISK_LEAF_NODE_LEVEL + 1) {
767                         int pos = p_s_last_element->pe_position;
768                         int limit = B_NR_ITEMS(p_s_bh);
769                         struct reiserfs_key *le_key;
770
771                         if (p_s_search_path->reada & PATH_READA_BACK)
772                                 limit = 0;
773                         while (reada_count < SEARCH_BY_KEY_READA) {
774                                 if (pos == limit)
775                                         break;
776                                 reada_blocks[reada_count++] =
777                                     B_N_CHILD_NUM(p_s_bh, pos);
778                                 if (p_s_search_path->reada & PATH_READA_BACK)
779                                         pos--;
780                                 else
781                                         pos++;
782
783                                 /*
784                                  * check to make sure we're in the same object
785                                  */
786                                 le_key = B_N_PDELIM_KEY(p_s_bh, pos);
787                                 if (le32_to_cpu(le_key->k_objectid) !=
788                                     p_s_key->on_disk_key.k_objectid) {
789                                         break;
790                                 }
791                         }
792                 }
793         }
794 }
795
796 /* Form the path to an item and position in this item which contains
797    file byte defined by p_s_key. If there is no such item
798    corresponding to the key, we point the path to the item with
799    maximal key less than p_s_key, and *p_n_pos_in_item is set to one
800    past the last entry/byte in the item.  If searching for entry in a
801    directory item, and it is not found, *p_n_pos_in_item is set to one
802    entry more than the entry with maximal key which is less than the
803    sought key.
804
805    Note that if there is no entry in this same node which is one more,
806    then we point to an imaginary entry.  for direct items, the
807    position is in units of bytes, for indirect items the position is
808    in units of blocknr entries, for directory items the position is in
809    units of directory entries.  */
810
811 /* The function is NOT SCHEDULE-SAFE! */
812 int search_for_position_by_key(struct super_block *p_s_sb,      /* Pointer to the super block.          */
813                                const struct cpu_key *p_cpu_key, /* Key to search (cpu variable)         */
814                                struct treepath *p_s_search_path /* Filled up by this function.          */
815     )
816 {
817         struct item_head *p_le_ih;      /* pointer to on-disk structure */
818         int n_blk_size;
819         loff_t item_offset, offset;
820         struct reiserfs_dir_entry de;
821         int retval;
822
823         /* If searching for directory entry. */
824         if (is_direntry_cpu_key(p_cpu_key))
825                 return search_by_entry_key(p_s_sb, p_cpu_key, p_s_search_path,
826                                            &de);
827
828         /* If not searching for directory entry. */
829
830         /* If item is found. */
831         retval = search_item(p_s_sb, p_cpu_key, p_s_search_path);
832         if (retval == IO_ERROR)
833                 return retval;
834         if (retval == ITEM_FOUND) {
835
836                 RFALSE(!ih_item_len
837                        (B_N_PITEM_HEAD
838                         (PATH_PLAST_BUFFER(p_s_search_path),
839                          PATH_LAST_POSITION(p_s_search_path))),
840                        "PAP-5165: item length equals zero");
841
842                 pos_in_item(p_s_search_path) = 0;
843                 return POSITION_FOUND;
844         }
845
846         RFALSE(!PATH_LAST_POSITION(p_s_search_path),
847                "PAP-5170: position equals zero");
848
849         /* Item is not found. Set path to the previous item. */
850         p_le_ih =
851             B_N_PITEM_HEAD(PATH_PLAST_BUFFER(p_s_search_path),
852                            --PATH_LAST_POSITION(p_s_search_path));
853         n_blk_size = p_s_sb->s_blocksize;
854
855         if (comp_short_keys(&(p_le_ih->ih_key), p_cpu_key)) {
856                 return FILE_NOT_FOUND;
857         }
858         // FIXME: quite ugly this far
859
860         item_offset = le_ih_k_offset(p_le_ih);
861         offset = cpu_key_k_offset(p_cpu_key);
862
863         /* Needed byte is contained in the item pointed to by the path. */
864         if (item_offset <= offset &&
865             item_offset + op_bytes_number(p_le_ih, n_blk_size) > offset) {
866                 pos_in_item(p_s_search_path) = offset - item_offset;
867                 if (is_indirect_le_ih(p_le_ih)) {
868                         pos_in_item(p_s_search_path) /= n_blk_size;
869                 }
870                 return POSITION_FOUND;
871         }
872
873         /* Needed byte is not contained in the item pointed to by the
874            path. Set pos_in_item out of the item. */
875         if (is_indirect_le_ih(p_le_ih))
876                 pos_in_item(p_s_search_path) =
877                     ih_item_len(p_le_ih) / UNFM_P_SIZE;
878         else
879                 pos_in_item(p_s_search_path) = ih_item_len(p_le_ih);
880
881         return POSITION_NOT_FOUND;
882 }
883
884 /* Compare given item and item pointed to by the path. */
885 int comp_items(const struct item_head *stored_ih, const struct treepath *p_s_path)
886 {
887         struct buffer_head *p_s_bh;
888         struct item_head *ih;
889
890         /* Last buffer at the path is not in the tree. */
891         if (!B_IS_IN_TREE(p_s_bh = PATH_PLAST_BUFFER(p_s_path)))
892                 return 1;
893
894         /* Last path position is invalid. */
895         if (PATH_LAST_POSITION(p_s_path) >= B_NR_ITEMS(p_s_bh))
896                 return 1;
897
898         /* we need only to know, whether it is the same item */
899         ih = get_ih(p_s_path);
900         return memcmp(stored_ih, ih, IH_SIZE);
901 }
902
903 /* unformatted nodes are not logged anymore, ever.  This is safe
904 ** now
905 */
906 #define held_by_others(bh) (atomic_read(&(bh)->b_count) > 1)
907
908 // block can not be forgotten as it is in I/O or held by someone
909 #define block_in_use(bh) (buffer_locked(bh) || (held_by_others(bh)))
910
911 // prepare for delete or cut of direct item
912 static inline int prepare_for_direct_item(struct treepath *path,
913                                           struct item_head *le_ih,
914                                           struct inode *inode,
915                                           loff_t new_file_length, int *cut_size)
916 {
917         loff_t round_len;
918
919         if (new_file_length == max_reiserfs_offset(inode)) {
920                 /* item has to be deleted */
921                 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
922                 return M_DELETE;
923         }
924         // new file gets truncated
925         if (get_inode_item_key_version(inode) == KEY_FORMAT_3_6) {
926                 // 
927                 round_len = ROUND_UP(new_file_length);
928                 /* this was n_new_file_length < le_ih ... */
929                 if (round_len < le_ih_k_offset(le_ih)) {
930                         *cut_size = -(IH_SIZE + ih_item_len(le_ih));
931                         return M_DELETE;        /* Delete this item. */
932                 }
933                 /* Calculate first position and size for cutting from item. */
934                 pos_in_item(path) = round_len - (le_ih_k_offset(le_ih) - 1);
935                 *cut_size = -(ih_item_len(le_ih) - pos_in_item(path));
936
937                 return M_CUT;   /* Cut from this item. */
938         }
939
940         // old file: items may have any length
941
942         if (new_file_length < le_ih_k_offset(le_ih)) {
943                 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
944                 return M_DELETE;        /* Delete this item. */
945         }
946         /* Calculate first position and size for cutting from item. */
947         *cut_size = -(ih_item_len(le_ih) -
948                       (pos_in_item(path) =
949                        new_file_length + 1 - le_ih_k_offset(le_ih)));
950         return M_CUT;           /* Cut from this item. */
951 }
952
953 static inline int prepare_for_direntry_item(struct treepath *path,
954                                             struct item_head *le_ih,
955                                             struct inode *inode,
956                                             loff_t new_file_length,
957                                             int *cut_size)
958 {
959         if (le_ih_k_offset(le_ih) == DOT_OFFSET &&
960             new_file_length == max_reiserfs_offset(inode)) {
961                 RFALSE(ih_entry_count(le_ih) != 2,
962                        "PAP-5220: incorrect empty directory item (%h)", le_ih);
963                 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
964                 return M_DELETE;        /* Delete the directory item containing "." and ".." entry. */
965         }
966
967         if (ih_entry_count(le_ih) == 1) {
968                 /* Delete the directory item such as there is one record only
969                    in this item */
970                 *cut_size = -(IH_SIZE + ih_item_len(le_ih));
971                 return M_DELETE;
972         }
973
974         /* Cut one record from the directory item. */
975         *cut_size =
976             -(DEH_SIZE +
977               entry_length(get_last_bh(path), le_ih, pos_in_item(path)));
978         return M_CUT;
979 }
980
981 #define JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD (2 * JOURNAL_PER_BALANCE_CNT + 1)
982
983 /*  If the path points to a directory or direct item, calculate mode and the size cut, for balance.
984     If the path points to an indirect item, remove some number of its unformatted nodes.
985     In case of file truncate calculate whether this item must be deleted/truncated or last
986     unformatted node of this item will be converted to a direct item.
987     This function returns a determination of what balance mode the calling function should employ. */
988 static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, struct inode *inode, struct treepath *p_s_path, const struct cpu_key *p_s_item_key, int *p_n_removed,     /* Number of unformatted nodes which were removed
989                                                                                                                                                                                    from end of the file. */
990                                       int *p_n_cut_size, unsigned long long n_new_file_length   /* MAX_KEY_OFFSET in case of delete. */
991     )
992 {
993         struct super_block *p_s_sb = inode->i_sb;
994         struct item_head *p_le_ih = PATH_PITEM_HEAD(p_s_path);
995         struct buffer_head *p_s_bh = PATH_PLAST_BUFFER(p_s_path);
996
997         BUG_ON(!th->t_trans_id);
998
999         /* Stat_data item. */
1000         if (is_statdata_le_ih(p_le_ih)) {
1001
1002                 RFALSE(n_new_file_length != max_reiserfs_offset(inode),
1003                        "PAP-5210: mode must be M_DELETE");
1004
1005                 *p_n_cut_size = -(IH_SIZE + ih_item_len(p_le_ih));
1006                 return M_DELETE;
1007         }
1008
1009         /* Directory item. */
1010         if (is_direntry_le_ih(p_le_ih))
1011                 return prepare_for_direntry_item(p_s_path, p_le_ih, inode,
1012                                                  n_new_file_length,
1013                                                  p_n_cut_size);
1014
1015         /* Direct item. */
1016         if (is_direct_le_ih(p_le_ih))
1017                 return prepare_for_direct_item(p_s_path, p_le_ih, inode,
1018                                                n_new_file_length, p_n_cut_size);
1019
1020         /* Case of an indirect item. */
1021         {
1022             int blk_size = p_s_sb->s_blocksize;
1023             struct item_head s_ih;
1024             int need_re_search;
1025             int delete = 0;
1026             int result = M_CUT;
1027             int pos = 0;
1028
1029             if ( n_new_file_length == max_reiserfs_offset (inode) ) {
1030                 /* prepare_for_delete_or_cut() is called by
1031                  * reiserfs_delete_item() */
1032                 n_new_file_length = 0;
1033                 delete = 1;
1034             }
1035
1036             do {
1037                 need_re_search = 0;
1038                 *p_n_cut_size = 0;
1039                 p_s_bh = PATH_PLAST_BUFFER(p_s_path);
1040                 copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path));
1041                 pos = I_UNFM_NUM(&s_ih);
1042
1043                 while (le_ih_k_offset (&s_ih) + (pos - 1) * blk_size > n_new_file_length) {
1044                     __le32 *unfm;
1045                     __u32 block;
1046
1047                     /* Each unformatted block deletion may involve one additional
1048                      * bitmap block into the transaction, thereby the initial
1049                      * journal space reservation might not be enough. */
1050                     if (!delete && (*p_n_cut_size) != 0 &&
1051                         reiserfs_transaction_free_space(th) < JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) {
1052                         break;
1053                     }
1054
1055                     unfm = (__le32 *)B_I_PITEM(p_s_bh, &s_ih) + pos - 1;
1056                     block = get_block_num(unfm, 0);
1057
1058                     if (block != 0) {
1059                         reiserfs_prepare_for_journal(p_s_sb, p_s_bh, 1);
1060                         put_block_num(unfm, 0, 0);
1061                         journal_mark_dirty (th, p_s_sb, p_s_bh);
1062                         reiserfs_free_block(th, inode, block, 1);
1063                     }
1064
1065                     cond_resched();
1066
1067                     if (item_moved (&s_ih, p_s_path))  {
1068                         need_re_search = 1;
1069                         break;
1070                     }
1071
1072                     pos --;
1073                     (*p_n_removed) ++;
1074                     (*p_n_cut_size) -= UNFM_P_SIZE;
1075
1076                     if (pos == 0) {
1077                         (*p_n_cut_size) -= IH_SIZE;
1078                         result = M_DELETE;
1079                         break;
1080                     }
1081                 }
1082                 /* a trick.  If the buffer has been logged, this will do nothing.  If
1083                 ** we've broken the loop without logging it, it will restore the
1084                 ** buffer */
1085                 reiserfs_restore_prepared_buffer(p_s_sb, p_s_bh);
1086             } while (need_re_search &&
1087                      search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path) == POSITION_FOUND);
1088             pos_in_item(p_s_path) = pos * UNFM_P_SIZE;
1089
1090             if (*p_n_cut_size == 0) {
1091                 /* Nothing were cut. maybe convert last unformatted node to the
1092                  * direct item? */
1093                 result = M_CONVERT;
1094             }
1095             return result;
1096         }
1097 }
1098
1099 /* Calculate number of bytes which will be deleted or cut during balance */
1100 static int calc_deleted_bytes_number(struct tree_balance *p_s_tb, char c_mode)
1101 {
1102         int n_del_size;
1103         struct item_head *p_le_ih = PATH_PITEM_HEAD(p_s_tb->tb_path);
1104
1105         if (is_statdata_le_ih(p_le_ih))
1106                 return 0;
1107
1108         n_del_size =
1109             (c_mode ==
1110              M_DELETE) ? ih_item_len(p_le_ih) : -p_s_tb->insert_size[0];
1111         if (is_direntry_le_ih(p_le_ih)) {
1112                 // return EMPTY_DIR_SIZE; /* We delete emty directoris only. */
1113                 // we can't use EMPTY_DIR_SIZE, as old format dirs have a different
1114                 // empty size.  ick. FIXME, is this right?
1115                 //
1116                 return n_del_size;
1117         }
1118
1119         if (is_indirect_le_ih(p_le_ih))
1120                 n_del_size = (n_del_size / UNFM_P_SIZE) * (PATH_PLAST_BUFFER(p_s_tb->tb_path)->b_size); // - get_ih_free_space (p_le_ih);
1121         return n_del_size;
1122 }
1123
1124 static void init_tb_struct(struct reiserfs_transaction_handle *th,
1125                            struct tree_balance *p_s_tb,
1126                            struct super_block *p_s_sb,
1127                            struct treepath *p_s_path, int n_size)
1128 {
1129
1130         BUG_ON(!th->t_trans_id);
1131
1132         memset(p_s_tb, '\0', sizeof(struct tree_balance));
1133         p_s_tb->transaction_handle = th;
1134         p_s_tb->tb_sb = p_s_sb;
1135         p_s_tb->tb_path = p_s_path;
1136         PATH_OFFSET_PBUFFER(p_s_path, ILLEGAL_PATH_ELEMENT_OFFSET) = NULL;
1137         PATH_OFFSET_POSITION(p_s_path, ILLEGAL_PATH_ELEMENT_OFFSET) = 0;
1138         p_s_tb->insert_size[0] = n_size;
1139 }
1140
1141 void padd_item(char *item, int total_length, int length)
1142 {
1143         int i;
1144
1145         for (i = total_length; i > length;)
1146                 item[--i] = 0;
1147 }
1148
1149 #ifdef REISERQUOTA_DEBUG
1150 char key2type(struct reiserfs_key *ih)
1151 {
1152         if (is_direntry_le_key(2, ih))
1153                 return 'd';
1154         if (is_direct_le_key(2, ih))
1155                 return 'D';
1156         if (is_indirect_le_key(2, ih))
1157                 return 'i';
1158         if (is_statdata_le_key(2, ih))
1159                 return 's';
1160         return 'u';
1161 }
1162
1163 char head2type(struct item_head *ih)
1164 {
1165         if (is_direntry_le_ih(ih))
1166                 return 'd';
1167         if (is_direct_le_ih(ih))
1168                 return 'D';
1169         if (is_indirect_le_ih(ih))
1170                 return 'i';
1171         if (is_statdata_le_ih(ih))
1172                 return 's';
1173         return 'u';
1174 }
1175 #endif
1176
1177 /* Delete object item. */
1178 int reiserfs_delete_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_path,     /* Path to the deleted item. */
1179                          const struct cpu_key *p_s_item_key,    /* Key to search for the deleted item.  */
1180                          struct inode *p_s_inode,       /* inode is here just to update i_blocks and quotas */
1181                          struct buffer_head *p_s_un_bh)
1182 {                               /* NULL or unformatted node pointer.    */
1183         struct super_block *p_s_sb = p_s_inode->i_sb;
1184         struct tree_balance s_del_balance;
1185         struct item_head s_ih;
1186         struct item_head *q_ih;
1187         int quota_cut_bytes;
1188         int n_ret_value, n_del_size, n_removed;
1189
1190 #ifdef CONFIG_REISERFS_CHECK
1191         char c_mode;
1192         int n_iter = 0;
1193 #endif
1194
1195         BUG_ON(!th->t_trans_id);
1196
1197         init_tb_struct(th, &s_del_balance, p_s_sb, p_s_path,
1198                        0 /*size is unknown */ );
1199
1200         while (1) {
1201                 n_removed = 0;
1202
1203 #ifdef CONFIG_REISERFS_CHECK
1204                 n_iter++;
1205                 c_mode =
1206 #endif
1207                     prepare_for_delete_or_cut(th, p_s_inode, p_s_path,
1208                                               p_s_item_key, &n_removed,
1209                                               &n_del_size,
1210                                               max_reiserfs_offset(p_s_inode));
1211
1212                 RFALSE(c_mode != M_DELETE, "PAP-5320: mode must be M_DELETE");
1213
1214                 copy_item_head(&s_ih, PATH_PITEM_HEAD(p_s_path));
1215                 s_del_balance.insert_size[0] = n_del_size;
1216
1217                 n_ret_value = fix_nodes(M_DELETE, &s_del_balance, NULL, NULL);
1218                 if (n_ret_value != REPEAT_SEARCH)
1219                         break;
1220
1221                 PROC_INFO_INC(p_s_sb, delete_item_restarted);
1222
1223                 // file system changed, repeat search
1224                 n_ret_value =
1225                     search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path);
1226                 if (n_ret_value == IO_ERROR)
1227                         break;
1228                 if (n_ret_value == FILE_NOT_FOUND) {
1229                         reiserfs_warning(p_s_sb, "vs-5340",
1230                                          "no items of the file %K found",
1231                                          p_s_item_key);
1232                         break;
1233                 }
1234         }                       /* while (1) */
1235
1236         if (n_ret_value != CARRY_ON) {
1237                 unfix_nodes(&s_del_balance);
1238                 return 0;
1239         }
1240         // reiserfs_delete_item returns item length when success
1241         n_ret_value = calc_deleted_bytes_number(&s_del_balance, M_DELETE);
1242         q_ih = get_ih(p_s_path);
1243         quota_cut_bytes = ih_item_len(q_ih);
1244
1245         /* hack so the quota code doesn't have to guess if the file
1246          ** has a tail.  On tail insert, we allocate quota for 1 unformatted node.
1247          ** We test the offset because the tail might have been
1248          ** split into multiple items, and we only want to decrement for
1249          ** the unfm node once
1250          */
1251         if (!S_ISLNK(p_s_inode->i_mode) && is_direct_le_ih(q_ih)) {
1252                 if ((le_ih_k_offset(q_ih) & (p_s_sb->s_blocksize - 1)) == 1) {
1253                         quota_cut_bytes = p_s_sb->s_blocksize + UNFM_P_SIZE;
1254                 } else {
1255                         quota_cut_bytes = 0;
1256                 }
1257         }
1258
1259         if (p_s_un_bh) {
1260                 int off;
1261                 char *data;
1262
1263                 /* We are in direct2indirect conversion, so move tail contents
1264                    to the unformatted node */
1265                 /* note, we do the copy before preparing the buffer because we
1266                  ** don't care about the contents of the unformatted node yet.
1267                  ** the only thing we really care about is the direct item's data
1268                  ** is in the unformatted node.
1269                  **
1270                  ** Otherwise, we would have to call reiserfs_prepare_for_journal on
1271                  ** the unformatted node, which might schedule, meaning we'd have to
1272                  ** loop all the way back up to the start of the while loop.
1273                  **
1274                  ** The unformatted node must be dirtied later on.  We can't be
1275                  ** sure here if the entire tail has been deleted yet.
1276                  **
1277                  ** p_s_un_bh is from the page cache (all unformatted nodes are
1278                  ** from the page cache) and might be a highmem page.  So, we
1279                  ** can't use p_s_un_bh->b_data.
1280                  ** -clm
1281                  */
1282
1283                 data = kmap_atomic(p_s_un_bh->b_page, KM_USER0);
1284                 off = ((le_ih_k_offset(&s_ih) - 1) & (PAGE_CACHE_SIZE - 1));
1285                 memcpy(data + off,
1286                        B_I_PITEM(PATH_PLAST_BUFFER(p_s_path), &s_ih),
1287                        n_ret_value);
1288                 kunmap_atomic(data, KM_USER0);
1289         }
1290         /* Perform balancing after all resources have been collected at once. */
1291         do_balance(&s_del_balance, NULL, NULL, M_DELETE);
1292
1293 #ifdef REISERQUOTA_DEBUG
1294         reiserfs_debug(p_s_sb, REISERFS_DEBUG_CODE,
1295                        "reiserquota delete_item(): freeing %u, id=%u type=%c",
1296                        quota_cut_bytes, p_s_inode->i_uid, head2type(&s_ih));
1297 #endif
1298         DQUOT_FREE_SPACE_NODIRTY(p_s_inode, quota_cut_bytes);
1299
1300         /* Return deleted body length */
1301         return n_ret_value;
1302 }
1303
1304 /* Summary Of Mechanisms For Handling Collisions Between Processes:
1305
1306  deletion of the body of the object is performed by iput(), with the
1307  result that if multiple processes are operating on a file, the
1308  deletion of the body of the file is deferred until the last process
1309  that has an open inode performs its iput().
1310
1311  writes and truncates are protected from collisions by use of
1312  semaphores.
1313
1314  creates, linking, and mknod are protected from collisions with other
1315  processes by making the reiserfs_add_entry() the last step in the
1316  creation, and then rolling back all changes if there was a collision.
1317  - Hans
1318 */
1319
1320 /* this deletes item which never gets split */
1321 void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
1322                                 struct inode *inode, struct reiserfs_key *key)
1323 {
1324         struct tree_balance tb;
1325         INITIALIZE_PATH(path);
1326         int item_len = 0;
1327         int tb_init = 0;
1328         struct cpu_key cpu_key;
1329         int retval;
1330         int quota_cut_bytes = 0;
1331
1332         BUG_ON(!th->t_trans_id);
1333
1334         le_key2cpu_key(&cpu_key, key);
1335
1336         while (1) {
1337                 retval = search_item(th->t_super, &cpu_key, &path);
1338                 if (retval == IO_ERROR) {
1339                         reiserfs_warning(th->t_super, "vs-5350",
1340                                          "i/o failure occurred trying "
1341                                          "to delete %K", &cpu_key);
1342                         break;
1343                 }
1344                 if (retval != ITEM_FOUND) {
1345                         pathrelse(&path);
1346                         // No need for a warning, if there is just no free space to insert '..' item into the newly-created subdir
1347                         if (!
1348                             ((unsigned long long)
1349                              GET_HASH_VALUE(le_key_k_offset
1350                                             (le_key_version(key), key)) == 0
1351                              && (unsigned long long)
1352                              GET_GENERATION_NUMBER(le_key_k_offset
1353                                                    (le_key_version(key),
1354                                                     key)) == 1))
1355                                 reiserfs_warning(th->t_super, "vs-5355",
1356                                                  "%k not found", key);
1357                         break;
1358                 }
1359                 if (!tb_init) {
1360                         tb_init = 1;
1361                         item_len = ih_item_len(PATH_PITEM_HEAD(&path));
1362                         init_tb_struct(th, &tb, th->t_super, &path,
1363                                        -(IH_SIZE + item_len));
1364                 }
1365                 quota_cut_bytes = ih_item_len(PATH_PITEM_HEAD(&path));
1366
1367                 retval = fix_nodes(M_DELETE, &tb, NULL, NULL);
1368                 if (retval == REPEAT_SEARCH) {
1369                         PROC_INFO_INC(th->t_super, delete_solid_item_restarted);
1370                         continue;
1371                 }
1372
1373                 if (retval == CARRY_ON) {
1374                         do_balance(&tb, NULL, NULL, M_DELETE);
1375                         if (inode) {    /* Should we count quota for item? (we don't count quotas for save-links) */
1376 #ifdef REISERQUOTA_DEBUG
1377                                 reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
1378                                                "reiserquota delete_solid_item(): freeing %u id=%u type=%c",
1379                                                quota_cut_bytes, inode->i_uid,
1380                                                key2type(key));
1381 #endif
1382                                 DQUOT_FREE_SPACE_NODIRTY(inode,
1383                                                          quota_cut_bytes);
1384                         }
1385                         break;
1386                 }
1387                 // IO_ERROR, NO_DISK_SPACE, etc
1388                 reiserfs_warning(th->t_super, "vs-5360",
1389                                  "could not delete %K due to fix_nodes failure",
1390                                  &cpu_key);
1391                 unfix_nodes(&tb);
1392                 break;
1393         }
1394
1395         reiserfs_check_path(&path);
1396 }
1397
1398 int reiserfs_delete_object(struct reiserfs_transaction_handle *th,
1399                            struct inode *inode)
1400 {
1401         int err;
1402         inode->i_size = 0;
1403         BUG_ON(!th->t_trans_id);
1404
1405         /* for directory this deletes item containing "." and ".." */
1406         err =
1407             reiserfs_do_truncate(th, inode, NULL, 0 /*no timestamp updates */ );
1408         if (err)
1409                 return err;
1410
1411 #if defined( USE_INODE_GENERATION_COUNTER )
1412         if (!old_format_only(th->t_super)) {
1413                 __le32 *inode_generation;
1414
1415                 inode_generation =
1416                     &REISERFS_SB(th->t_super)->s_rs->s_inode_generation;
1417                 le32_add_cpu(inode_generation, 1);
1418         }
1419 /* USE_INODE_GENERATION_COUNTER */
1420 #endif
1421         reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode));
1422
1423         return err;
1424 }
1425
1426 static void unmap_buffers(struct page *page, loff_t pos)
1427 {
1428         struct buffer_head *bh;
1429         struct buffer_head *head;
1430         struct buffer_head *next;
1431         unsigned long tail_index;
1432         unsigned long cur_index;
1433
1434         if (page) {
1435                 if (page_has_buffers(page)) {
1436                         tail_index = pos & (PAGE_CACHE_SIZE - 1);
1437                         cur_index = 0;
1438                         head = page_buffers(page);
1439                         bh = head;
1440                         do {
1441                                 next = bh->b_this_page;
1442
1443                                 /* we want to unmap the buffers that contain the tail, and
1444                                  ** all the buffers after it (since the tail must be at the
1445                                  ** end of the file).  We don't want to unmap file data
1446                                  ** before the tail, since it might be dirty and waiting to
1447                                  ** reach disk
1448                                  */
1449                                 cur_index += bh->b_size;
1450                                 if (cur_index > tail_index) {
1451                                         reiserfs_unmap_buffer(bh);
1452                                 }
1453                                 bh = next;
1454                         } while (bh != head);
1455                 }
1456         }
1457 }
1458
1459 static int maybe_indirect_to_direct(struct reiserfs_transaction_handle *th,
1460                                     struct inode *p_s_inode,
1461                                     struct page *page,
1462                                     struct treepath *p_s_path,
1463                                     const struct cpu_key *p_s_item_key,
1464                                     loff_t n_new_file_size, char *p_c_mode)
1465 {
1466         struct super_block *p_s_sb = p_s_inode->i_sb;
1467         int n_block_size = p_s_sb->s_blocksize;
1468         int cut_bytes;
1469         BUG_ON(!th->t_trans_id);
1470         BUG_ON(n_new_file_size != p_s_inode->i_size);
1471
1472         /* the page being sent in could be NULL if there was an i/o error
1473          ** reading in the last block.  The user will hit problems trying to
1474          ** read the file, but for now we just skip the indirect2direct
1475          */
1476         if (atomic_read(&p_s_inode->i_count) > 1 ||
1477             !tail_has_to_be_packed(p_s_inode) ||
1478             !page || (REISERFS_I(p_s_inode)->i_flags & i_nopack_mask)) {
1479                 // leave tail in an unformatted node    
1480                 *p_c_mode = M_SKIP_BALANCING;
1481                 cut_bytes =
1482                     n_block_size - (n_new_file_size & (n_block_size - 1));
1483                 pathrelse(p_s_path);
1484                 return cut_bytes;
1485         }
1486         /* Permorm the conversion to a direct_item. */
1487         /*return indirect_to_direct (p_s_inode, p_s_path, p_s_item_key, n_new_file_size, p_c_mode); */
1488         return indirect2direct(th, p_s_inode, page, p_s_path, p_s_item_key,
1489                                n_new_file_size, p_c_mode);
1490 }
1491
1492 /* we did indirect_to_direct conversion. And we have inserted direct
1493    item successesfully, but there were no disk space to cut unfm
1494    pointer being converted. Therefore we have to delete inserted
1495    direct item(s) */
1496 static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th,
1497                                          struct inode *inode, struct treepath *path)
1498 {
1499         struct cpu_key tail_key;
1500         int tail_len;
1501         int removed;
1502         BUG_ON(!th->t_trans_id);
1503
1504         make_cpu_key(&tail_key, inode, inode->i_size + 1, TYPE_DIRECT, 4);      // !!!!
1505         tail_key.key_length = 4;
1506
1507         tail_len =
1508             (cpu_key_k_offset(&tail_key) & (inode->i_sb->s_blocksize - 1)) - 1;
1509         while (tail_len) {
1510                 /* look for the last byte of the tail */
1511                 if (search_for_position_by_key(inode->i_sb, &tail_key, path) ==
1512                     POSITION_NOT_FOUND)
1513                         reiserfs_panic(inode->i_sb, "vs-5615",
1514                                        "found invalid item");
1515                 RFALSE(path->pos_in_item !=
1516                        ih_item_len(PATH_PITEM_HEAD(path)) - 1,
1517                        "vs-5616: appended bytes found");
1518                 PATH_LAST_POSITION(path)--;
1519
1520                 removed =
1521                     reiserfs_delete_item(th, path, &tail_key, inode,
1522                                          NULL /*unbh not needed */ );
1523                 RFALSE(removed <= 0
1524                        || removed > tail_len,
1525                        "vs-5617: there was tail %d bytes, removed item length %d bytes",
1526                        tail_len, removed);
1527                 tail_len -= removed;
1528                 set_cpu_key_k_offset(&tail_key,
1529                                      cpu_key_k_offset(&tail_key) - removed);
1530         }
1531         reiserfs_warning(inode->i_sb, "reiserfs-5091", "indirect_to_direct "
1532                          "conversion has been rolled back due to "
1533                          "lack of disk space");
1534         //mark_file_without_tail (inode);
1535         mark_inode_dirty(inode);
1536 }
1537
1538 /* (Truncate or cut entry) or delete object item. Returns < 0 on failure */
1539 int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th,
1540                            struct treepath *p_s_path,
1541                            struct cpu_key *p_s_item_key,
1542                            struct inode *p_s_inode,
1543                            struct page *page, loff_t n_new_file_size)
1544 {
1545         struct super_block *p_s_sb = p_s_inode->i_sb;
1546         /* Every function which is going to call do_balance must first
1547            create a tree_balance structure.  Then it must fill up this
1548            structure by using the init_tb_struct and fix_nodes functions.
1549            After that we can make tree balancing. */
1550         struct tree_balance s_cut_balance;
1551         struct item_head *p_le_ih;
1552         int n_cut_size = 0,     /* Amount to be cut. */
1553             n_ret_value = CARRY_ON, n_removed = 0,      /* Number of the removed unformatted nodes. */
1554             n_is_inode_locked = 0;
1555         char c_mode;            /* Mode of the balance. */
1556         int retval2 = -1;
1557         int quota_cut_bytes;
1558         loff_t tail_pos = 0;
1559
1560         BUG_ON(!th->t_trans_id);
1561
1562         init_tb_struct(th, &s_cut_balance, p_s_inode->i_sb, p_s_path,
1563                        n_cut_size);
1564
1565         /* Repeat this loop until we either cut the item without needing
1566            to balance, or we fix_nodes without schedule occurring */
1567         while (1) {
1568                 /* Determine the balance mode, position of the first byte to
1569                    be cut, and size to be cut.  In case of the indirect item
1570                    free unformatted nodes which are pointed to by the cut
1571                    pointers. */
1572
1573                 c_mode =
1574                     prepare_for_delete_or_cut(th, p_s_inode, p_s_path,
1575                                               p_s_item_key, &n_removed,
1576                                               &n_cut_size, n_new_file_size);
1577                 if (c_mode == M_CONVERT) {
1578                         /* convert last unformatted node to direct item or leave
1579                            tail in the unformatted node */
1580                         RFALSE(n_ret_value != CARRY_ON,
1581                                "PAP-5570: can not convert twice");
1582
1583                         n_ret_value =
1584                             maybe_indirect_to_direct(th, p_s_inode, page,
1585                                                      p_s_path, p_s_item_key,
1586                                                      n_new_file_size, &c_mode);
1587                         if (c_mode == M_SKIP_BALANCING)
1588                                 /* tail has been left in the unformatted node */
1589                                 return n_ret_value;
1590
1591                         n_is_inode_locked = 1;
1592
1593                         /* removing of last unformatted node will change value we
1594                            have to return to truncate. Save it */
1595                         retval2 = n_ret_value;
1596                         /*retval2 = p_s_sb->s_blocksize - (n_new_file_size & (p_s_sb->s_blocksize - 1)); */
1597
1598                         /* So, we have performed the first part of the conversion:
1599                            inserting the new direct item.  Now we are removing the
1600                            last unformatted node pointer. Set key to search for
1601                            it. */
1602                         set_cpu_key_k_type(p_s_item_key, TYPE_INDIRECT);
1603                         p_s_item_key->key_length = 4;
1604                         n_new_file_size -=
1605                             (n_new_file_size & (p_s_sb->s_blocksize - 1));
1606                         tail_pos = n_new_file_size;
1607                         set_cpu_key_k_offset(p_s_item_key, n_new_file_size + 1);
1608                         if (search_for_position_by_key
1609                             (p_s_sb, p_s_item_key,
1610                              p_s_path) == POSITION_NOT_FOUND) {
1611                                 print_block(PATH_PLAST_BUFFER(p_s_path), 3,
1612                                             PATH_LAST_POSITION(p_s_path) - 1,
1613                                             PATH_LAST_POSITION(p_s_path) + 1);
1614                                 reiserfs_panic(p_s_sb, "PAP-5580", "item to "
1615                                                "convert does not exist (%K)",
1616                                                p_s_item_key);
1617                         }
1618                         continue;
1619                 }
1620                 if (n_cut_size == 0) {
1621                         pathrelse(p_s_path);
1622                         return 0;
1623                 }
1624
1625                 s_cut_balance.insert_size[0] = n_cut_size;
1626
1627                 n_ret_value = fix_nodes(c_mode, &s_cut_balance, NULL, NULL);
1628                 if (n_ret_value != REPEAT_SEARCH)
1629                         break;
1630
1631                 PROC_INFO_INC(p_s_sb, cut_from_item_restarted);
1632
1633                 n_ret_value =
1634                     search_for_position_by_key(p_s_sb, p_s_item_key, p_s_path);
1635                 if (n_ret_value == POSITION_FOUND)
1636                         continue;
1637
1638                 reiserfs_warning(p_s_sb, "PAP-5610", "item %K not found",
1639                                  p_s_item_key);
1640                 unfix_nodes(&s_cut_balance);
1641                 return (n_ret_value == IO_ERROR) ? -EIO : -ENOENT;
1642         }                       /* while */
1643
1644         // check fix_nodes results (IO_ERROR or NO_DISK_SPACE)
1645         if (n_ret_value != CARRY_ON) {
1646                 if (n_is_inode_locked) {
1647                         // FIXME: this seems to be not needed: we are always able
1648                         // to cut item
1649                         indirect_to_direct_roll_back(th, p_s_inode, p_s_path);
1650                 }
1651                 if (n_ret_value == NO_DISK_SPACE)
1652                         reiserfs_warning(p_s_sb, "reiserfs-5092",
1653                                          "NO_DISK_SPACE");
1654                 unfix_nodes(&s_cut_balance);
1655                 return -EIO;
1656         }
1657
1658         /* go ahead and perform balancing */
1659
1660         RFALSE(c_mode == M_PASTE || c_mode == M_INSERT, "invalid mode");
1661
1662         /* Calculate number of bytes that need to be cut from the item. */
1663         quota_cut_bytes =
1664             (c_mode ==
1665              M_DELETE) ? ih_item_len(get_ih(p_s_path)) : -s_cut_balance.
1666             insert_size[0];
1667         if (retval2 == -1)
1668                 n_ret_value = calc_deleted_bytes_number(&s_cut_balance, c_mode);
1669         else
1670                 n_ret_value = retval2;
1671
1672         /* For direct items, we only change the quota when deleting the last
1673          ** item.
1674          */
1675         p_le_ih = PATH_PITEM_HEAD(s_cut_balance.tb_path);
1676         if (!S_ISLNK(p_s_inode->i_mode) && is_direct_le_ih(p_le_ih)) {
1677                 if (c_mode == M_DELETE &&
1678                     (le_ih_k_offset(p_le_ih) & (p_s_sb->s_blocksize - 1)) ==
1679                     1) {
1680                         // FIXME: this is to keep 3.5 happy
1681                         REISERFS_I(p_s_inode)->i_first_direct_byte = U32_MAX;
1682                         quota_cut_bytes = p_s_sb->s_blocksize + UNFM_P_SIZE;
1683                 } else {
1684                         quota_cut_bytes = 0;
1685                 }
1686         }
1687 #ifdef CONFIG_REISERFS_CHECK
1688         if (n_is_inode_locked) {
1689                 struct item_head *le_ih =
1690                     PATH_PITEM_HEAD(s_cut_balance.tb_path);
1691                 /* we are going to complete indirect2direct conversion. Make
1692                    sure, that we exactly remove last unformatted node pointer
1693                    of the item */
1694                 if (!is_indirect_le_ih(le_ih))
1695                         reiserfs_panic(p_s_sb, "vs-5652",
1696                                        "item must be indirect %h", le_ih);
1697
1698                 if (c_mode == M_DELETE && ih_item_len(le_ih) != UNFM_P_SIZE)
1699                         reiserfs_panic(p_s_sb, "vs-5653", "completing "
1700                                        "indirect2direct conversion indirect "
1701                                        "item %h being deleted must be of "
1702                                        "4 byte long", le_ih);
1703
1704                 if (c_mode == M_CUT
1705                     && s_cut_balance.insert_size[0] != -UNFM_P_SIZE) {
1706                         reiserfs_panic(p_s_sb, "vs-5654", "can not complete "
1707                                        "indirect2direct conversion of %h "
1708                                        "(CUT, insert_size==%d)",
1709                                        le_ih, s_cut_balance.insert_size[0]);
1710                 }
1711                 /* it would be useful to make sure, that right neighboring
1712                    item is direct item of this file */
1713         }
1714 #endif
1715
1716         do_balance(&s_cut_balance, NULL, NULL, c_mode);
1717         if (n_is_inode_locked) {
1718                 /* we've done an indirect->direct conversion.  when the data block
1719                  ** was freed, it was removed from the list of blocks that must
1720                  ** be flushed before the transaction commits, make sure to
1721                  ** unmap and invalidate it
1722                  */
1723                 unmap_buffers(page, tail_pos);
1724                 REISERFS_I(p_s_inode)->i_flags &= ~i_pack_on_close_mask;
1725         }
1726 #ifdef REISERQUOTA_DEBUG
1727         reiserfs_debug(p_s_inode->i_sb, REISERFS_DEBUG_CODE,
1728                        "reiserquota cut_from_item(): freeing %u id=%u type=%c",
1729                        quota_cut_bytes, p_s_inode->i_uid, '?');
1730 #endif
1731         DQUOT_FREE_SPACE_NODIRTY(p_s_inode, quota_cut_bytes);
1732         return n_ret_value;
1733 }
1734
1735 static void truncate_directory(struct reiserfs_transaction_handle *th,
1736                                struct inode *inode)
1737 {
1738         BUG_ON(!th->t_trans_id);
1739         if (inode->i_nlink)
1740                 reiserfs_warning(inode->i_sb, "vs-5655", "link count != 0");
1741
1742         set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), DOT_OFFSET);
1743         set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_DIRENTRY);
1744         reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode));
1745         reiserfs_update_sd(th, inode);
1746         set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), SD_OFFSET);
1747         set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_STAT_DATA);
1748 }
1749
1750 /* Truncate file to the new size. Note, this must be called with a transaction
1751    already started */
1752 int reiserfs_do_truncate(struct reiserfs_transaction_handle *th, struct inode *p_s_inode,       /* ->i_size contains new
1753                                                                                                    size */
1754                          struct page *page,     /* up to date for last block */
1755                          int update_timestamps  /* when it is called by
1756                                                    file_release to convert
1757                                                    the tail - no timestamps
1758                                                    should be updated */
1759     )
1760 {
1761         INITIALIZE_PATH(s_search_path); /* Path to the current object item. */
1762         struct item_head *p_le_ih;      /* Pointer to an item header. */
1763         struct cpu_key s_item_key;      /* Key to search for a previous file item. */
1764         loff_t n_file_size,     /* Old file size. */
1765          n_new_file_size;       /* New file size. */
1766         int n_deleted;          /* Number of deleted or truncated bytes. */
1767         int retval;
1768         int err = 0;
1769
1770         BUG_ON(!th->t_trans_id);
1771         if (!
1772             (S_ISREG(p_s_inode->i_mode) || S_ISDIR(p_s_inode->i_mode)
1773              || S_ISLNK(p_s_inode->i_mode)))
1774                 return 0;
1775
1776         if (S_ISDIR(p_s_inode->i_mode)) {
1777                 // deletion of directory - no need to update timestamps
1778                 truncate_directory(th, p_s_inode);
1779                 return 0;
1780         }
1781
1782         /* Get new file size. */
1783         n_new_file_size = p_s_inode->i_size;
1784
1785         // FIXME: note, that key type is unimportant here
1786         make_cpu_key(&s_item_key, p_s_inode, max_reiserfs_offset(p_s_inode),
1787                      TYPE_DIRECT, 3);
1788
1789         retval =
1790             search_for_position_by_key(p_s_inode->i_sb, &s_item_key,
1791                                        &s_search_path);
1792         if (retval == IO_ERROR) {
1793                 reiserfs_warning(p_s_inode->i_sb, "vs-5657",
1794                                  "i/o failure occurred trying to truncate %K",
1795                                  &s_item_key);
1796                 err = -EIO;
1797                 goto out;
1798         }
1799         if (retval == POSITION_FOUND || retval == FILE_NOT_FOUND) {
1800                 reiserfs_warning(p_s_inode->i_sb, "PAP-5660",
1801                                  "wrong result %d of search for %K", retval,
1802                                  &s_item_key);
1803
1804                 err = -EIO;
1805                 goto out;
1806         }
1807
1808         s_search_path.pos_in_item--;
1809
1810         /* Get real file size (total length of all file items) */
1811         p_le_ih = PATH_PITEM_HEAD(&s_search_path);
1812         if (is_statdata_le_ih(p_le_ih))
1813                 n_file_size = 0;
1814         else {
1815                 loff_t offset = le_ih_k_offset(p_le_ih);
1816                 int bytes =
1817                     op_bytes_number(p_le_ih, p_s_inode->i_sb->s_blocksize);
1818
1819                 /* this may mismatch with real file size: if last direct item
1820                    had no padding zeros and last unformatted node had no free
1821                    space, this file would have this file size */
1822                 n_file_size = offset + bytes - 1;
1823         }
1824         /*
1825          * are we doing a full truncate or delete, if so
1826          * kick in the reada code
1827          */
1828         if (n_new_file_size == 0)
1829                 s_search_path.reada = PATH_READA | PATH_READA_BACK;
1830
1831         if (n_file_size == 0 || n_file_size < n_new_file_size) {
1832                 goto update_and_out;
1833         }
1834
1835         /* Update key to search for the last file item. */
1836         set_cpu_key_k_offset(&s_item_key, n_file_size);
1837
1838         do {
1839                 /* Cut or delete file item. */
1840                 n_deleted =
1841                     reiserfs_cut_from_item(th, &s_search_path, &s_item_key,
1842                                            p_s_inode, page, n_new_file_size);
1843                 if (n_deleted < 0) {
1844                         reiserfs_warning(p_s_inode->i_sb, "vs-5665",
1845                                          "reiserfs_cut_from_item failed");
1846                         reiserfs_check_path(&s_search_path);
1847                         return 0;
1848                 }
1849
1850                 RFALSE(n_deleted > n_file_size,
1851                        "PAP-5670: reiserfs_cut_from_item: too many bytes deleted: deleted %d, file_size %lu, item_key %K",
1852                        n_deleted, n_file_size, &s_item_key);
1853
1854                 /* Change key to search the last file item. */
1855                 n_file_size -= n_deleted;
1856
1857                 set_cpu_key_k_offset(&s_item_key, n_file_size);
1858
1859                 /* While there are bytes to truncate and previous file item is presented in the tree. */
1860
1861                 /*
1862                  ** This loop could take a really long time, and could log 
1863                  ** many more blocks than a transaction can hold.  So, we do a polite
1864                  ** journal end here, and if the transaction needs ending, we make
1865                  ** sure the file is consistent before ending the current trans
1866                  ** and starting a new one
1867                  */
1868                 if (journal_transaction_should_end(th, 0) ||
1869                     reiserfs_transaction_free_space(th) <= JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) {
1870                         int orig_len_alloc = th->t_blocks_allocated;
1871                         decrement_counters_in_path(&s_search_path);
1872
1873                         if (update_timestamps) {
1874                                 p_s_inode->i_mtime = p_s_inode->i_ctime =
1875                                     CURRENT_TIME_SEC;
1876                         }
1877                         reiserfs_update_sd(th, p_s_inode);
1878
1879                         err = journal_end(th, p_s_inode->i_sb, orig_len_alloc);
1880                         if (err)
1881                                 goto out;
1882                         err = journal_begin(th, p_s_inode->i_sb,
1883                                             JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD + JOURNAL_PER_BALANCE_CNT * 4) ;
1884                         if (err)
1885                                 goto out;
1886                         reiserfs_update_inode_transaction(p_s_inode);
1887                 }
1888         } while (n_file_size > ROUND_UP(n_new_file_size) &&
1889                  search_for_position_by_key(p_s_inode->i_sb, &s_item_key,
1890                                             &s_search_path) == POSITION_FOUND);
1891
1892         RFALSE(n_file_size > ROUND_UP(n_new_file_size),
1893                "PAP-5680: truncate did not finish: new_file_size %Ld, current %Ld, oid %d",
1894                n_new_file_size, n_file_size, s_item_key.on_disk_key.k_objectid);
1895
1896       update_and_out:
1897         if (update_timestamps) {
1898                 // this is truncate, not file closing
1899                 p_s_inode->i_mtime = p_s_inode->i_ctime = CURRENT_TIME_SEC;
1900         }
1901         reiserfs_update_sd(th, p_s_inode);
1902
1903       out:
1904         pathrelse(&s_search_path);
1905         return err;
1906 }
1907
1908 #ifdef CONFIG_REISERFS_CHECK
1909 // this makes sure, that we __append__, not overwrite or add holes
1910 static void check_research_for_paste(struct treepath *path,
1911                                      const struct cpu_key *p_s_key)
1912 {
1913         struct item_head *found_ih = get_ih(path);
1914
1915         if (is_direct_le_ih(found_ih)) {
1916                 if (le_ih_k_offset(found_ih) +
1917                     op_bytes_number(found_ih,
1918                                     get_last_bh(path)->b_size) !=
1919                     cpu_key_k_offset(p_s_key)
1920                     || op_bytes_number(found_ih,
1921                                        get_last_bh(path)->b_size) !=
1922                     pos_in_item(path))
1923                         reiserfs_panic(NULL, "PAP-5720", "found direct item "
1924                                        "%h or position (%d) does not match "
1925                                        "to key %K", found_ih,
1926                                        pos_in_item(path), p_s_key);
1927         }
1928         if (is_indirect_le_ih(found_ih)) {
1929                 if (le_ih_k_offset(found_ih) +
1930                     op_bytes_number(found_ih,
1931                                     get_last_bh(path)->b_size) !=
1932                     cpu_key_k_offset(p_s_key)
1933                     || I_UNFM_NUM(found_ih) != pos_in_item(path)
1934                     || get_ih_free_space(found_ih) != 0)
1935                         reiserfs_panic(NULL, "PAP-5730", "found indirect "
1936                                        "item (%h) or position (%d) does not "
1937                                        "match to key (%K)",
1938                                        found_ih, pos_in_item(path), p_s_key);
1939         }
1940 }
1941 #endif                          /* config reiserfs check */
1942
1943 /* Paste bytes to the existing item. Returns bytes number pasted into the item. */
1944 int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_search_path,  /* Path to the pasted item.          */
1945                              const struct cpu_key *p_s_key,     /* Key to search for the needed item. */
1946                              struct inode *inode,       /* Inode item belongs to */
1947                              const char *p_c_body,      /* Pointer to the bytes to paste.    */
1948                              int n_pasted_size)
1949 {                               /* Size of pasted bytes.             */
1950         struct tree_balance s_paste_balance;
1951         int retval;
1952         int fs_gen;
1953
1954         BUG_ON(!th->t_trans_id);
1955
1956         fs_gen = get_generation(inode->i_sb);
1957
1958 #ifdef REISERQUOTA_DEBUG
1959         reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
1960                        "reiserquota paste_into_item(): allocating %u id=%u type=%c",
1961                        n_pasted_size, inode->i_uid,
1962                        key2type(&(p_s_key->on_disk_key)));
1963 #endif
1964
1965         if (DQUOT_ALLOC_SPACE_NODIRTY(inode, n_pasted_size)) {
1966                 pathrelse(p_s_search_path);
1967                 return -EDQUOT;
1968         }
1969         init_tb_struct(th, &s_paste_balance, th->t_super, p_s_search_path,
1970                        n_pasted_size);
1971 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
1972         s_paste_balance.key = p_s_key->on_disk_key;
1973 #endif
1974
1975         /* DQUOT_* can schedule, must check before the fix_nodes */
1976         if (fs_changed(fs_gen, inode->i_sb)) {
1977                 goto search_again;
1978         }
1979
1980         while ((retval =
1981                 fix_nodes(M_PASTE, &s_paste_balance, NULL,
1982                           p_c_body)) == REPEAT_SEARCH) {
1983               search_again:
1984                 /* file system changed while we were in the fix_nodes */
1985                 PROC_INFO_INC(th->t_super, paste_into_item_restarted);
1986                 retval =
1987                     search_for_position_by_key(th->t_super, p_s_key,
1988                                                p_s_search_path);
1989                 if (retval == IO_ERROR) {
1990                         retval = -EIO;
1991                         goto error_out;
1992                 }
1993                 if (retval == POSITION_FOUND) {
1994                         reiserfs_warning(inode->i_sb, "PAP-5710",
1995                                          "entry or pasted byte (%K) exists",
1996                                          p_s_key);
1997                         retval = -EEXIST;
1998                         goto error_out;
1999                 }
2000 #ifdef CONFIG_REISERFS_CHECK
2001                 check_research_for_paste(p_s_search_path, p_s_key);
2002 #endif
2003         }
2004
2005         /* Perform balancing after all resources are collected by fix_nodes, and
2006            accessing them will not risk triggering schedule. */
2007         if (retval == CARRY_ON) {
2008                 do_balance(&s_paste_balance, NULL /*ih */ , p_c_body, M_PASTE);
2009                 return 0;
2010         }
2011         retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO;
2012       error_out:
2013         /* this also releases the path */
2014         unfix_nodes(&s_paste_balance);
2015 #ifdef REISERQUOTA_DEBUG
2016         reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
2017                        "reiserquota paste_into_item(): freeing %u id=%u type=%c",
2018                        n_pasted_size, inode->i_uid,
2019                        key2type(&(p_s_key->on_disk_key)));
2020 #endif
2021         DQUOT_FREE_SPACE_NODIRTY(inode, n_pasted_size);
2022         return retval;
2023 }
2024
2025 /* Insert new item into the buffer at the path. */
2026 int reiserfs_insert_item(struct reiserfs_transaction_handle *th, struct treepath *p_s_path,     /* Path to the inserteded item.         */
2027                          const struct cpu_key *key, struct item_head *p_s_ih,   /* Pointer to the item header to insert. */
2028                          struct inode *inode, const char *p_c_body)
2029 {                               /* Pointer to the bytes to insert.      */
2030         struct tree_balance s_ins_balance;
2031         int retval;
2032         int fs_gen = 0;
2033         int quota_bytes = 0;
2034
2035         BUG_ON(!th->t_trans_id);
2036
2037         if (inode) {            /* Do we count quotas for item? */
2038                 fs_gen = get_generation(inode->i_sb);
2039                 quota_bytes = ih_item_len(p_s_ih);
2040
2041                 /* hack so the quota code doesn't have to guess if the file has
2042                  ** a tail, links are always tails, so there's no guessing needed
2043                  */
2044                 if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(p_s_ih)) {
2045                         quota_bytes = inode->i_sb->s_blocksize + UNFM_P_SIZE;
2046                 }
2047 #ifdef REISERQUOTA_DEBUG
2048                 reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
2049                                "reiserquota insert_item(): allocating %u id=%u type=%c",
2050                                quota_bytes, inode->i_uid, head2type(p_s_ih));
2051 #endif
2052                 /* We can't dirty inode here. It would be immediately written but
2053                  * appropriate stat item isn't inserted yet... */
2054                 if (DQUOT_ALLOC_SPACE_NODIRTY(inode, quota_bytes)) {
2055                         pathrelse(p_s_path);
2056                         return -EDQUOT;
2057                 }
2058         }
2059         init_tb_struct(th, &s_ins_balance, th->t_super, p_s_path,
2060                        IH_SIZE + ih_item_len(p_s_ih));
2061 #ifdef DISPLACE_NEW_PACKING_LOCALITIES
2062         s_ins_balance.key = key->on_disk_key;
2063 #endif
2064         /* DQUOT_* can schedule, must check to be sure calling fix_nodes is safe */
2065         if (inode && fs_changed(fs_gen, inode->i_sb)) {
2066                 goto search_again;
2067         }
2068
2069         while ((retval =
2070                 fix_nodes(M_INSERT, &s_ins_balance, p_s_ih,
2071                           p_c_body)) == REPEAT_SEARCH) {
2072               search_again:
2073                 /* file system changed while we were in the fix_nodes */
2074                 PROC_INFO_INC(th->t_super, insert_item_restarted);
2075                 retval = search_item(th->t_super, key, p_s_path);
2076                 if (retval == IO_ERROR) {
2077                         retval = -EIO;
2078                         goto error_out;
2079                 }
2080                 if (retval == ITEM_FOUND) {
2081                         reiserfs_warning(th->t_super, "PAP-5760",
2082                                          "key %K already exists in the tree",
2083                                          key);
2084                         retval = -EEXIST;
2085                         goto error_out;
2086                 }
2087         }
2088
2089         /* make balancing after all resources will be collected at a time */
2090         if (retval == CARRY_ON) {
2091                 do_balance(&s_ins_balance, p_s_ih, p_c_body, M_INSERT);
2092                 return 0;
2093         }
2094
2095         retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO;
2096       error_out:
2097         /* also releases the path */
2098         unfix_nodes(&s_ins_balance);
2099 #ifdef REISERQUOTA_DEBUG
2100         reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
2101                        "reiserquota insert_item(): freeing %u id=%u type=%c",
2102                        quota_bytes, inode->i_uid, head2type(p_s_ih));
2103 #endif
2104         if (inode)
2105                 DQUOT_FREE_SPACE_NODIRTY(inode, quota_bytes);
2106         return retval;
2107 }