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ocfs2: fix locking for res->tracking and dlm->tracking_list
[linux/fpc-iii.git] / fs / reiserfs / do_balan.c
blob9c02d96d3a424cefd997471c1e0b1fdc0407495d
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
5 /*
6 * Now we have all buffers that must be used in balancing of the tree
7 * Further calculations can not cause schedule(), and thus the buffer
8 * tree will be stable until the balancing will be finished
9 * balance the tree according to the analysis made before,
10 * and using buffers obtained after all above.
11 */
12
13 #include <linux/uaccess.h>
14 #include <linux/time.h>
15 #include "reiserfs.h"
16 #include <linux/buffer_head.h>
17 #include <linux/kernel.h>
18
19 static inline void buffer_info_init_left(struct tree_balance *tb,
20 struct buffer_info *bi)
21 {
22 bi->tb = tb;
23 bi->bi_bh = tb->L[0];
24 bi->bi_parent = tb->FL[0];
25 bi->bi_position = get_left_neighbor_position(tb, 0);
26 }
27
28 static inline void buffer_info_init_right(struct tree_balance *tb,
29 struct buffer_info *bi)
30 {
31 bi->tb = tb;
32 bi->bi_bh = tb->R[0];
33 bi->bi_parent = tb->FR[0];
34 bi->bi_position = get_right_neighbor_position(tb, 0);
35 }
36
37 static inline void buffer_info_init_tbS0(struct tree_balance *tb,
38 struct buffer_info *bi)
39 {
40 bi->tb = tb;
41 bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
42 bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
43 bi->bi_position = PATH_H_POSITION(tb->tb_path, 1);
44 }
45
46 static inline void buffer_info_init_bh(struct tree_balance *tb,
47 struct buffer_info *bi,
48 struct buffer_head *bh)
49 {
50 bi->tb = tb;
51 bi->bi_bh = bh;
52 bi->bi_parent = NULL;
53 bi->bi_position = 0;
54 }
55
56 inline void do_balance_mark_leaf_dirty(struct tree_balance *tb,
57 struct buffer_head *bh, int flag)
58 {
59 journal_mark_dirty(tb->transaction_handle, bh);
60 }
61
62 #define do_balance_mark_internal_dirty do_balance_mark_leaf_dirty
63 #define do_balance_mark_sb_dirty do_balance_mark_leaf_dirty
64
65 /*
66 * summary:
67 * if deleting something ( tb->insert_size[0] < 0 )
68 * return(balance_leaf_when_delete()); (flag d handled here)
69 * else
70 * if lnum is larger than 0 we put items into the left node
71 * if rnum is larger than 0 we put items into the right node
72 * if snum1 is larger than 0 we put items into the new node s1
73 * if snum2 is larger than 0 we put items into the new node s2
74 * Note that all *num* count new items being created.
75 */
76
77 static void balance_leaf_when_delete_del(struct tree_balance *tb)
78 {
79 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
80 int item_pos = PATH_LAST_POSITION(tb->tb_path);
81 struct buffer_info bi;
82 #ifdef CONFIG_REISERFS_CHECK
83 struct item_head *ih = item_head(tbS0, item_pos);
84 #endif
85
86 RFALSE(ih_item_len(ih) + IH_SIZE != -tb->insert_size[0],
87 "vs-12013: mode Delete, insert size %d, ih to be deleted %h",
88 -tb->insert_size[0], ih);
89
90 buffer_info_init_tbS0(tb, &bi);
91 leaf_delete_items(&bi, 0, item_pos, 1, -1);
92
93 if (!item_pos && tb->CFL[0]) {
94 if (B_NR_ITEMS(tbS0)) {
95 replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
96 } else {
97 if (!PATH_H_POSITION(tb->tb_path, 1))
98 replace_key(tb, tb->CFL[0], tb->lkey[0],
99 PATH_H_PPARENT(tb->tb_path, 0), 0);
100 }
101 }
102
103 RFALSE(!item_pos && !tb->CFL[0],
104 "PAP-12020: tb->CFL[0]==%p, tb->L[0]==%p", tb->CFL[0],
105 tb->L[0]);
106 }
107
108 /* cut item in S[0] */
109 static void balance_leaf_when_delete_cut(struct tree_balance *tb)
110 {
111 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
112 int item_pos = PATH_LAST_POSITION(tb->tb_path);
113 struct item_head *ih = item_head(tbS0, item_pos);
114 int pos_in_item = tb->tb_path->pos_in_item;
115 struct buffer_info bi;
116 buffer_info_init_tbS0(tb, &bi);
117
118 if (is_direntry_le_ih(ih)) {
119 /*
120 * UFS unlink semantics are such that you can only
121 * delete one directory entry at a time.
122 *
123 * when we cut a directory tb->insert_size[0] means
124 * number of entries to be cut (always 1)
125 */
126 tb->insert_size[0] = -1;
127 leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
128 -tb->insert_size[0]);
129
130 RFALSE(!item_pos && !pos_in_item && !tb->CFL[0],
131 "PAP-12030: can not change delimiting key. CFL[0]=%p",
132 tb->CFL[0]);
133
134 if (!item_pos && !pos_in_item && tb->CFL[0])
135 replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
136 } else {
137 leaf_cut_from_buffer(&bi, item_pos, pos_in_item,
138 -tb->insert_size[0]);
139
140 RFALSE(!ih_item_len(ih),
141 "PAP-12035: cut must leave non-zero dynamic "
142 "length of item");
143 }
144 }
145
146 static int balance_leaf_when_delete_left(struct tree_balance *tb)
147 {
148 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
149 int n = B_NR_ITEMS(tbS0);
150
151 /* L[0] must be joined with S[0] */
152 if (tb->lnum[0] == -1) {
153 /* R[0] must be also joined with S[0] */
154 if (tb->rnum[0] == -1) {
155 if (tb->FR[0] == PATH_H_PPARENT(tb->tb_path, 0)) {
156 /*
157 * all contents of all the
158 * 3 buffers will be in L[0]
159 */
160 if (PATH_H_POSITION(tb->tb_path, 1) == 0 &&
161 1 < B_NR_ITEMS(tb->FR[0]))
162 replace_key(tb, tb->CFL[0],
163 tb->lkey[0], tb->FR[0], 1);
164
165 leaf_move_items(LEAF_FROM_S_TO_L, tb, n, -1,
166 NULL);
167 leaf_move_items(LEAF_FROM_R_TO_L, tb,
168 B_NR_ITEMS(tb->R[0]), -1,
169 NULL);
170
171 reiserfs_invalidate_buffer(tb, tbS0);
172 reiserfs_invalidate_buffer(tb, tb->R[0]);
173
174 return 0;
175 }
176
177 /* all contents of all the 3 buffers will be in R[0] */
178 leaf_move_items(LEAF_FROM_S_TO_R, tb, n, -1, NULL);
179 leaf_move_items(LEAF_FROM_L_TO_R, tb,
180 B_NR_ITEMS(tb->L[0]), -1, NULL);
181
182 /* right_delimiting_key is correct in R[0] */
183 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
184
185 reiserfs_invalidate_buffer(tb, tbS0);
186 reiserfs_invalidate_buffer(tb, tb->L[0]);
187
188 return -1;
189 }
190
191 RFALSE(tb->rnum[0] != 0,
192 "PAP-12045: rnum must be 0 (%d)", tb->rnum[0]);
193 /* all contents of L[0] and S[0] will be in L[0] */
194 leaf_shift_left(tb, n, -1);
195
196 reiserfs_invalidate_buffer(tb, tbS0);
197
198 return 0;
199 }
200
201 /*
202 * a part of contents of S[0] will be in L[0] and
203 * the rest part of S[0] will be in R[0]
204 */
205
206 RFALSE((tb->lnum[0] + tb->rnum[0] < n) ||
207 (tb->lnum[0] + tb->rnum[0] > n + 1),
208 "PAP-12050: rnum(%d) and lnum(%d) and item "
209 "number(%d) in S[0] are not consistent",
210 tb->rnum[0], tb->lnum[0], n);
211 RFALSE((tb->lnum[0] + tb->rnum[0] == n) &&
212 (tb->lbytes != -1 || tb->rbytes != -1),
213 "PAP-12055: bad rbytes (%d)/lbytes (%d) "
214 "parameters when items are not split",
215 tb->rbytes, tb->lbytes);
216 RFALSE((tb->lnum[0] + tb->rnum[0] == n + 1) &&
217 (tb->lbytes < 1 || tb->rbytes != -1),
218 "PAP-12060: bad rbytes (%d)/lbytes (%d) "
219 "parameters when items are split",
220 tb->rbytes, tb->lbytes);
221
222 leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
223 leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
224
225 reiserfs_invalidate_buffer(tb, tbS0);
226
227 return 0;
228 }
229
230 /*
231 * Balance leaf node in case of delete or cut: insert_size[0] < 0
232 *
233 * lnum, rnum can have values >= -1
234 * -1 means that the neighbor must be joined with S
235 * 0 means that nothing should be done with the neighbor
236 * >0 means to shift entirely or partly the specified number of items
237 * to the neighbor
238 */
239 static int balance_leaf_when_delete(struct tree_balance *tb, int flag)
240 {
241 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
242 int item_pos = PATH_LAST_POSITION(tb->tb_path);
243 struct buffer_info bi;
244 int n;
245 struct item_head *ih;
246
247 RFALSE(tb->FR[0] && B_LEVEL(tb->FR[0]) != DISK_LEAF_NODE_LEVEL + 1,
248 "vs- 12000: level: wrong FR %z", tb->FR[0]);
249 RFALSE(tb->blknum[0] > 1,
250 "PAP-12005: tb->blknum == %d, can not be > 1", tb->blknum[0]);
251 RFALSE(!tb->blknum[0] && !PATH_H_PPARENT(tb->tb_path, 0),
252 "PAP-12010: tree can not be empty");
253
254 ih = item_head(tbS0, item_pos);
255 buffer_info_init_tbS0(tb, &bi);
256
257 /* Delete or truncate the item */
258
259 BUG_ON(flag != M_DELETE && flag != M_CUT);
260 if (flag == M_DELETE)
261 balance_leaf_when_delete_del(tb);
262 else /* M_CUT */
263 balance_leaf_when_delete_cut(tb);
264
265
266 /*
267 * the rule is that no shifting occurs unless by shifting
268 * a node can be freed
269 */
270 n = B_NR_ITEMS(tbS0);
271
272
273 /* L[0] takes part in balancing */
274 if (tb->lnum[0])
275 return balance_leaf_when_delete_left(tb);
276
277 if (tb->rnum[0] == -1) {
278 /* all contents of R[0] and S[0] will be in R[0] */
279 leaf_shift_right(tb, n, -1);
280 reiserfs_invalidate_buffer(tb, tbS0);
281 return 0;
282 }
283
284 RFALSE(tb->rnum[0],
285 "PAP-12065: bad rnum parameter must be 0 (%d)", tb->rnum[0]);
286 return 0;
287 }
288
289 static unsigned int balance_leaf_insert_left(struct tree_balance *tb,
290 struct item_head *const ih,
291 const char * const body)
292 {
293 int ret;
294 struct buffer_info bi;
295 int n = B_NR_ITEMS(tb->L[0]);
296 unsigned body_shift_bytes = 0;
297
298 if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1) {
299 /* part of new item falls into L[0] */
300 int new_item_len, shift;
301 int version;
302
303 ret = leaf_shift_left(tb, tb->lnum[0] - 1, -1);
304
305 /* Calculate item length to insert to S[0] */
306 new_item_len = ih_item_len(ih) - tb->lbytes;
307
308 /* Calculate and check item length to insert to L[0] */
309 put_ih_item_len(ih, ih_item_len(ih) - new_item_len);
310
311 RFALSE(ih_item_len(ih) <= 0,
312 "PAP-12080: there is nothing to insert into L[0]: "
313 "ih_item_len=%d", ih_item_len(ih));
314
315 /* Insert new item into L[0] */
316 buffer_info_init_left(tb, &bi);
317 leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body,
318 min_t(int, tb->zeroes_num, ih_item_len(ih)));
319
320 version = ih_version(ih);
321
322 /*
323 * Calculate key component, item length and body to
324 * insert into S[0]
325 */
326 shift = 0;
327 if (is_indirect_le_ih(ih))
328 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
329
330 add_le_ih_k_offset(ih, tb->lbytes << shift);
331
332 put_ih_item_len(ih, new_item_len);
333 if (tb->lbytes > tb->zeroes_num) {
334 body_shift_bytes = tb->lbytes - tb->zeroes_num;
335 tb->zeroes_num = 0;
336 } else
337 tb->zeroes_num -= tb->lbytes;
338
339 RFALSE(ih_item_len(ih) <= 0,
340 "PAP-12085: there is nothing to insert into S[0]: "
341 "ih_item_len=%d", ih_item_len(ih));
342 } else {
343 /* new item in whole falls into L[0] */
344 /* Shift lnum[0]-1 items to L[0] */
345 ret = leaf_shift_left(tb, tb->lnum[0] - 1, tb->lbytes);
346
347 /* Insert new item into L[0] */
348 buffer_info_init_left(tb, &bi);
349 leaf_insert_into_buf(&bi, n + tb->item_pos - ret, ih, body,
350 tb->zeroes_num);
351 tb->insert_size[0] = 0;
352 tb->zeroes_num = 0;
353 }
354 return body_shift_bytes;
355 }
356
357 static void balance_leaf_paste_left_shift_dirent(struct tree_balance *tb,
358 struct item_head * const ih,
359 const char * const body)
360 {
361 int n = B_NR_ITEMS(tb->L[0]);
362 struct buffer_info bi;
363
364 RFALSE(tb->zeroes_num,
365 "PAP-12090: invalid parameter in case of a directory");
366
367 /* directory item */
368 if (tb->lbytes > tb->pos_in_item) {
369 /* new directory entry falls into L[0] */
370 struct item_head *pasted;
371 int ret, l_pos_in_item = tb->pos_in_item;
372
373 /*
374 * Shift lnum[0] - 1 items in whole.
375 * Shift lbytes - 1 entries from given directory item
376 */
377 ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes - 1);
378 if (ret && !tb->item_pos) {
379 pasted = item_head(tb->L[0], B_NR_ITEMS(tb->L[0]) - 1);
380 l_pos_in_item += ih_entry_count(pasted) -
381 (tb->lbytes - 1);
382 }
383
384 /* Append given directory entry to directory item */
385 buffer_info_init_left(tb, &bi);
386 leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
387 l_pos_in_item, tb->insert_size[0],
388 body, tb->zeroes_num);
389
390 /*
391 * previous string prepared space for pasting new entry,
392 * following string pastes this entry
393 */
394
395 /*
396 * when we have merge directory item, pos_in_item
397 * has been changed too
398 */
399
400 /* paste new directory entry. 1 is entry number */
401 leaf_paste_entries(&bi, n + tb->item_pos - ret,
402 l_pos_in_item, 1,
403 (struct reiserfs_de_head *) body,
404 body + DEH_SIZE, tb->insert_size[0]);
405 tb->insert_size[0] = 0;
406 } else {
407 /* new directory item doesn't fall into L[0] */
408 /*
409 * Shift lnum[0]-1 items in whole. Shift lbytes
410 * directory entries from directory item number lnum[0]
411 */
412 leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
413 }
414
415 /* Calculate new position to append in item body */
416 tb->pos_in_item -= tb->lbytes;
417 }
418
419 static unsigned int balance_leaf_paste_left_shift(struct tree_balance *tb,
420 struct item_head * const ih,
421 const char * const body)
422 {
423 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
424 int n = B_NR_ITEMS(tb->L[0]);
425 struct buffer_info bi;
426 int body_shift_bytes = 0;
427
428 if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
429 balance_leaf_paste_left_shift_dirent(tb, ih, body);
430 return 0;
431 }
432
433 RFALSE(tb->lbytes <= 0,
434 "PAP-12095: there is nothing to shift to L[0]. "
435 "lbytes=%d", tb->lbytes);
436 RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
437 "PAP-12100: incorrect position to paste: "
438 "item_len=%d, pos_in_item=%d",
439 ih_item_len(item_head(tbS0, tb->item_pos)), tb->pos_in_item);
440
441 /* appended item will be in L[0] in whole */
442 if (tb->lbytes >= tb->pos_in_item) {
443 struct item_head *tbS0_pos_ih, *tbL0_ih;
444 struct item_head *tbS0_0_ih;
445 struct reiserfs_key *left_delim_key;
446 int ret, l_n, version, temp_l;
447
448 tbS0_pos_ih = item_head(tbS0, tb->item_pos);
449 tbS0_0_ih = item_head(tbS0, 0);
450
451 /*
452 * this bytes number must be appended
453 * to the last item of L[h]
454 */
455 l_n = tb->lbytes - tb->pos_in_item;
456
457 /* Calculate new insert_size[0] */
458 tb->insert_size[0] -= l_n;
459
460 RFALSE(tb->insert_size[0] <= 0,
461 "PAP-12105: there is nothing to paste into "
462 "L[0]. insert_size=%d", tb->insert_size[0]);
463
464 ret = leaf_shift_left(tb, tb->lnum[0],
465 ih_item_len(tbS0_pos_ih));
466
467 tbL0_ih = item_head(tb->L[0], n + tb->item_pos - ret);
468
469 /* Append to body of item in L[0] */
470 buffer_info_init_left(tb, &bi);
471 leaf_paste_in_buffer(&bi, n + tb->item_pos - ret,
472 ih_item_len(tbL0_ih), l_n, body,
473 min_t(int, l_n, tb->zeroes_num));
474
475 /*
476 * 0-th item in S0 can be only of DIRECT type
477 * when l_n != 0
478 */
479 temp_l = l_n;
480
481 RFALSE(ih_item_len(tbS0_0_ih),
482 "PAP-12106: item length must be 0");
483 RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
484 leaf_key(tb->L[0], n + tb->item_pos - ret)),
485 "PAP-12107: items must be of the same file");
486
487 if (is_indirect_le_ih(tbL0_ih)) {
488 int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
489 temp_l = l_n << shift;
490 }
491 /* update key of first item in S0 */
492 version = ih_version(tbS0_0_ih);
493 add_le_key_k_offset(version, &tbS0_0_ih->ih_key, temp_l);
494
495 /* update left delimiting key */
496 left_delim_key = internal_key(tb->CFL[0], tb->lkey[0]);
497 add_le_key_k_offset(version, left_delim_key, temp_l);
498
499 /*
500 * Calculate new body, position in item and
501 * insert_size[0]
502 */
503 if (l_n > tb->zeroes_num) {
504 body_shift_bytes = l_n - tb->zeroes_num;
505 tb->zeroes_num = 0;
506 } else
507 tb->zeroes_num -= l_n;
508 tb->pos_in_item = 0;
509
510 RFALSE(comp_short_le_keys(&tbS0_0_ih->ih_key,
511 leaf_key(tb->L[0],
512 B_NR_ITEMS(tb->L[0]) - 1)) ||
513 !op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size) ||
514 !op_is_left_mergeable(left_delim_key, tbS0->b_size),
515 "PAP-12120: item must be merge-able with left "
516 "neighboring item");
517 } else {
518 /* only part of the appended item will be in L[0] */
519
520 /* Calculate position in item for append in S[0] */
521 tb->pos_in_item -= tb->lbytes;
522
523 RFALSE(tb->pos_in_item <= 0,
524 "PAP-12125: no place for paste. pos_in_item=%d",
525 tb->pos_in_item);
526
527 /*
528 * Shift lnum[0] - 1 items in whole.
529 * Shift lbytes - 1 byte from item number lnum[0]
530 */
531 leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
532 }
533 return body_shift_bytes;
534 }
535
536
537 /* appended item will be in L[0] in whole */
538 static void balance_leaf_paste_left_whole(struct tree_balance *tb,
539 struct item_head * const ih,
540 const char * const body)
541 {
542 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
543 int n = B_NR_ITEMS(tb->L[0]);
544 struct buffer_info bi;
545 struct item_head *pasted;
546 int ret;
547
548 /* if we paste into first item of S[0] and it is left mergable */
549 if (!tb->item_pos &&
550 op_is_left_mergeable(leaf_key(tbS0, 0), tbS0->b_size)) {
551 /*
552 * then increment pos_in_item by the size of the
553 * last item in L[0]
554 */
555 pasted = item_head(tb->L[0], n - 1);
556 if (is_direntry_le_ih(pasted))
557 tb->pos_in_item += ih_entry_count(pasted);
558 else
559 tb->pos_in_item += ih_item_len(pasted);
560 }
561
562 /*
563 * Shift lnum[0] - 1 items in whole.
564 * Shift lbytes - 1 byte from item number lnum[0]
565 */
566 ret = leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
567
568 /* Append to body of item in L[0] */
569 buffer_info_init_left(tb, &bi);
570 leaf_paste_in_buffer(&bi, n + tb->item_pos - ret, tb->pos_in_item,
571 tb->insert_size[0], body, tb->zeroes_num);
572
573 /* if appended item is directory, paste entry */
574 pasted = item_head(tb->L[0], n + tb->item_pos - ret);
575 if (is_direntry_le_ih(pasted))
576 leaf_paste_entries(&bi, n + tb->item_pos - ret,
577 tb->pos_in_item, 1,
578 (struct reiserfs_de_head *)body,
579 body + DEH_SIZE, tb->insert_size[0]);
580
581 /*
582 * if appended item is indirect item, put unformatted node
583 * into un list
584 */
585 if (is_indirect_le_ih(pasted))
586 set_ih_free_space(pasted, 0);
587
588 tb->insert_size[0] = 0;
589 tb->zeroes_num = 0;
590 }
591
592 static unsigned int balance_leaf_paste_left(struct tree_balance *tb,
593 struct item_head * const ih,
594 const char * const body)
595 {
596 /* we must shift the part of the appended item */
597 if (tb->item_pos == tb->lnum[0] - 1 && tb->lbytes != -1)
598 return balance_leaf_paste_left_shift(tb, ih, body);
599 else
600 balance_leaf_paste_left_whole(tb, ih, body);
601 return 0;
602 }
603
604 /* Shift lnum[0] items from S[0] to the left neighbor L[0] */
605 static unsigned int balance_leaf_left(struct tree_balance *tb,
606 struct item_head * const ih,
607 const char * const body, int flag)
608 {
609 if (tb->lnum[0] <= 0)
610 return 0;
611
612 /* new item or it part falls to L[0], shift it too */
613 if (tb->item_pos < tb->lnum[0]) {
614 BUG_ON(flag != M_INSERT && flag != M_PASTE);
615
616 if (flag == M_INSERT)
617 return balance_leaf_insert_left(tb, ih, body);
618 else /* M_PASTE */
619 return balance_leaf_paste_left(tb, ih, body);
620 } else
621 /* new item doesn't fall into L[0] */
622 leaf_shift_left(tb, tb->lnum[0], tb->lbytes);
623 return 0;
624 }
625
626
627 static void balance_leaf_insert_right(struct tree_balance *tb,
628 struct item_head * const ih,
629 const char * const body)
630 {
631
632 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
633 int n = B_NR_ITEMS(tbS0);
634 struct buffer_info bi;
635 int ret;
636
637 /* new item or part of it doesn't fall into R[0] */
638 if (n - tb->rnum[0] >= tb->item_pos) {
639 leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
640 return;
641 }
642
643 /* new item or its part falls to R[0] */
644
645 /* part of new item falls into R[0] */
646 if (tb->item_pos == n - tb->rnum[0] + 1 && tb->rbytes != -1) {
647 loff_t old_key_comp, old_len, r_zeroes_number;
648 const char *r_body;
649 int version, shift;
650 loff_t offset;
651
652 leaf_shift_right(tb, tb->rnum[0] - 1, -1);
653
654 version = ih_version(ih);
655
656 /* Remember key component and item length */
657 old_key_comp = le_ih_k_offset(ih);
658 old_len = ih_item_len(ih);
659
660 /*
661 * Calculate key component and item length to insert
662 * into R[0]
663 */
664 shift = 0;
665 if (is_indirect_le_ih(ih))
666 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
667 offset = le_ih_k_offset(ih) + ((old_len - tb->rbytes) << shift);
668 set_le_ih_k_offset(ih, offset);
669 put_ih_item_len(ih, tb->rbytes);
670
671 /* Insert part of the item into R[0] */
672 buffer_info_init_right(tb, &bi);
673 if ((old_len - tb->rbytes) > tb->zeroes_num) {
674 r_zeroes_number = 0;
675 r_body = body + (old_len - tb->rbytes) - tb->zeroes_num;
676 } else {
677 r_body = body;
678 r_zeroes_number = tb->zeroes_num -
679 (old_len - tb->rbytes);
680 tb->zeroes_num -= r_zeroes_number;
681 }
682
683 leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number);
684
685 /* Replace right delimiting key by first key in R[0] */
686 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
687
688 /*
689 * Calculate key component and item length to
690 * insert into S[0]
691 */
692 set_le_ih_k_offset(ih, old_key_comp);
693 put_ih_item_len(ih, old_len - tb->rbytes);
694
695 tb->insert_size[0] -= tb->rbytes;
696
697 } else {
698 /* whole new item falls into R[0] */
699
700 /* Shift rnum[0]-1 items to R[0] */
701 ret = leaf_shift_right(tb, tb->rnum[0] - 1, tb->rbytes);
702
703 /* Insert new item into R[0] */
704 buffer_info_init_right(tb, &bi);
705 leaf_insert_into_buf(&bi, tb->item_pos - n + tb->rnum[0] - 1,
706 ih, body, tb->zeroes_num);
707
708 if (tb->item_pos - n + tb->rnum[0] - 1 == 0)
709 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
710
711 tb->zeroes_num = tb->insert_size[0] = 0;
712 }
713 }
714
715
716 static void balance_leaf_paste_right_shift_dirent(struct tree_balance *tb,
717 struct item_head * const ih,
718 const char * const body)
719 {
720 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
721 struct buffer_info bi;
722 int entry_count;
723
724 RFALSE(tb->zeroes_num,
725 "PAP-12145: invalid parameter in case of a directory");
726 entry_count = ih_entry_count(item_head(tbS0, tb->item_pos));
727
728 /* new directory entry falls into R[0] */
729 if (entry_count - tb->rbytes < tb->pos_in_item) {
730 int paste_entry_position;
731
732 RFALSE(tb->rbytes - 1 >= entry_count || !tb->insert_size[0],
733 "PAP-12150: no enough of entries to shift to R[0]: "
734 "rbytes=%d, entry_count=%d", tb->rbytes, entry_count);
735
736 /*
737 * Shift rnum[0]-1 items in whole.
738 * Shift rbytes-1 directory entries from directory
739 * item number rnum[0]
740 */
741 leaf_shift_right(tb, tb->rnum[0], tb->rbytes - 1);
742
743 /* Paste given directory entry to directory item */
744 paste_entry_position = tb->pos_in_item - entry_count +
745 tb->rbytes - 1;
746 buffer_info_init_right(tb, &bi);
747 leaf_paste_in_buffer(&bi, 0, paste_entry_position,
748 tb->insert_size[0], body, tb->zeroes_num);
749
750 /* paste entry */
751 leaf_paste_entries(&bi, 0, paste_entry_position, 1,
752 (struct reiserfs_de_head *) body,
753 body + DEH_SIZE, tb->insert_size[0]);
754
755 /* change delimiting keys */
756 if (paste_entry_position == 0)
757 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
758
759 tb->insert_size[0] = 0;
760 tb->pos_in_item++;
761 } else {
762 /* new directory entry doesn't fall into R[0] */
763 leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
764 }
765 }
766
767 static void balance_leaf_paste_right_shift(struct tree_balance *tb,
768 struct item_head * const ih,
769 const char * const body)
770 {
771 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
772 int n_shift, n_rem, r_zeroes_number, version;
773 unsigned long temp_rem;
774 const char *r_body;
775 struct buffer_info bi;
776
777 /* we append to directory item */
778 if (is_direntry_le_ih(item_head(tbS0, tb->item_pos))) {
779 balance_leaf_paste_right_shift_dirent(tb, ih, body);
780 return;
781 }
782
783 /* regular object */
784
785 /*
786 * Calculate number of bytes which must be shifted
787 * from appended item
788 */
789 n_shift = tb->rbytes - tb->insert_size[0];
790 if (n_shift < 0)
791 n_shift = 0;
792
793 RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)),
794 "PAP-12155: invalid position to paste. ih_item_len=%d, "
795 "pos_in_item=%d", tb->pos_in_item,
796 ih_item_len(item_head(tbS0, tb->item_pos)));
797
798 leaf_shift_right(tb, tb->rnum[0], n_shift);
799
800 /*
801 * Calculate number of bytes which must remain in body
802 * after appending to R[0]
803 */
804 n_rem = tb->insert_size[0] - tb->rbytes;
805 if (n_rem < 0)
806 n_rem = 0;
807
808 temp_rem = n_rem;
809
810 version = ih_version(item_head(tb->R[0], 0));
811
812 if (is_indirect_le_key(version, leaf_key(tb->R[0], 0))) {
813 int shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
814 temp_rem = n_rem << shift;
815 }
816
817 add_le_key_k_offset(version, leaf_key(tb->R[0], 0), temp_rem);
818 add_le_key_k_offset(version, internal_key(tb->CFR[0], tb->rkey[0]),
819 temp_rem);
820
821 do_balance_mark_internal_dirty(tb, tb->CFR[0], 0);
822
823 /* Append part of body into R[0] */
824 buffer_info_init_right(tb, &bi);
825 if (n_rem > tb->zeroes_num) {
826 r_zeroes_number = 0;
827 r_body = body + n_rem - tb->zeroes_num;
828 } else {
829 r_body = body;
830 r_zeroes_number = tb->zeroes_num - n_rem;
831 tb->zeroes_num -= r_zeroes_number;
832 }
833
834 leaf_paste_in_buffer(&bi, 0, n_shift, tb->insert_size[0] - n_rem,
835 r_body, r_zeroes_number);
836
837 if (is_indirect_le_ih(item_head(tb->R[0], 0)))
838 set_ih_free_space(item_head(tb->R[0], 0), 0);
839
840 tb->insert_size[0] = n_rem;
841 if (!n_rem)
842 tb->pos_in_item++;
843 }
844
845 static void balance_leaf_paste_right_whole(struct tree_balance *tb,
846 struct item_head * const ih,
847 const char * const body)
848 {
849 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
850 int n = B_NR_ITEMS(tbS0);
851 struct item_head *pasted;
852 struct buffer_info bi;
853
854 buffer_info_init_right(tb, &bi);
855 leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
856
857 /* append item in R[0] */
858 if (tb->pos_in_item >= 0) {
859 buffer_info_init_right(tb, &bi);
860 leaf_paste_in_buffer(&bi, tb->item_pos - n + tb->rnum[0],
861 tb->pos_in_item, tb->insert_size[0], body,
862 tb->zeroes_num);
863 }
864
865 /* paste new entry, if item is directory item */
866 pasted = item_head(tb->R[0], tb->item_pos - n + tb->rnum[0]);
867 if (is_direntry_le_ih(pasted) && tb->pos_in_item >= 0) {
868 leaf_paste_entries(&bi, tb->item_pos - n + tb->rnum[0],
869 tb->pos_in_item, 1,
870 (struct reiserfs_de_head *)body,
871 body + DEH_SIZE, tb->insert_size[0]);
872
873 if (!tb->pos_in_item) {
874
875 RFALSE(tb->item_pos - n + tb->rnum[0],
876 "PAP-12165: directory item must be first "
877 "item of node when pasting is in 0th position");
878
879 /* update delimiting keys */
880 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
881 }
882 }
883
884 if (is_indirect_le_ih(pasted))
885 set_ih_free_space(pasted, 0);
886 tb->zeroes_num = tb->insert_size[0] = 0;
887 }
888
889 static void balance_leaf_paste_right(struct tree_balance *tb,
890 struct item_head * const ih,
891 const char * const body)
892 {
893 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
894 int n = B_NR_ITEMS(tbS0);
895
896 /* new item doesn't fall into R[0] */
897 if (n - tb->rnum[0] > tb->item_pos) {
898 leaf_shift_right(tb, tb->rnum[0], tb->rbytes);
899 return;
900 }
901
902 /* pasted item or part of it falls to R[0] */
903
904 if (tb->item_pos == n - tb->rnum[0] && tb->rbytes != -1)
905 /* we must shift the part of the appended item */
906 balance_leaf_paste_right_shift(tb, ih, body);
907 else
908 /* pasted item in whole falls into R[0] */
909 balance_leaf_paste_right_whole(tb, ih, body);
910 }
911
912 /* shift rnum[0] items from S[0] to the right neighbor R[0] */
913 static void balance_leaf_right(struct tree_balance *tb,
914 struct item_head * const ih,
915 const char * const body, int flag)
916 {
917 if (tb->rnum[0] <= 0)
918 return;
919
920 BUG_ON(flag != M_INSERT && flag != M_PASTE);
921
922 if (flag == M_INSERT)
923 balance_leaf_insert_right(tb, ih, body);
924 else /* M_PASTE */
925 balance_leaf_paste_right(tb, ih, body);
926 }
927
928 static void balance_leaf_new_nodes_insert(struct tree_balance *tb,
929 struct item_head * const ih,
930 const char * const body,
931 struct item_head *insert_key,
932 struct buffer_head **insert_ptr,
933 int i)
934 {
935 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
936 int n = B_NR_ITEMS(tbS0);
937 struct buffer_info bi;
938 int shift;
939
940 /* new item or it part don't falls into S_new[i] */
941 if (n - tb->snum[i] >= tb->item_pos) {
942 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
943 tb->snum[i], tb->sbytes[i], tb->S_new[i]);
944 return;
945 }
946
947 /* new item or it's part falls to first new node S_new[i] */
948
949 /* part of new item falls into S_new[i] */
950 if (tb->item_pos == n - tb->snum[i] + 1 && tb->sbytes[i] != -1) {
951 int old_key_comp, old_len, r_zeroes_number;
952 const char *r_body;
953 int version;
954
955 /* Move snum[i]-1 items from S[0] to S_new[i] */
956 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i] - 1, -1,
957 tb->S_new[i]);
958
959 /* Remember key component and item length */
960 version = ih_version(ih);
961 old_key_comp = le_ih_k_offset(ih);
962 old_len = ih_item_len(ih);
963
964 /*
965 * Calculate key component and item length to insert
966 * into S_new[i]
967 */
968 shift = 0;
969 if (is_indirect_le_ih(ih))
970 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
971 set_le_ih_k_offset(ih,
972 le_ih_k_offset(ih) +
973 ((old_len - tb->sbytes[i]) << shift));
974
975 put_ih_item_len(ih, tb->sbytes[i]);
976
977 /* Insert part of the item into S_new[i] before 0-th item */
978 buffer_info_init_bh(tb, &bi, tb->S_new[i]);
979
980 if ((old_len - tb->sbytes[i]) > tb->zeroes_num) {
981 r_zeroes_number = 0;
982 r_body = body + (old_len - tb->sbytes[i]) -
983 tb->zeroes_num;
984 } else {
985 r_body = body;
986 r_zeroes_number = tb->zeroes_num - (old_len -
987 tb->sbytes[i]);
988 tb->zeroes_num -= r_zeroes_number;
989 }
990
991 leaf_insert_into_buf(&bi, 0, ih, r_body, r_zeroes_number);
992
993 /*
994 * Calculate key component and item length to
995 * insert into S[i]
996 */
997 set_le_ih_k_offset(ih, old_key_comp);
998 put_ih_item_len(ih, old_len - tb->sbytes[i]);
999 tb->insert_size[0] -= tb->sbytes[i];
1000 } else {
1001 /* whole new item falls into S_new[i] */
1002
1003 /*
1004 * Shift snum[0] - 1 items to S_new[i]
1005 * (sbytes[i] of split item)
1006 */
1007 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
1008 tb->snum[i] - 1, tb->sbytes[i], tb->S_new[i]);
1009
1010 /* Insert new item into S_new[i] */
1011 buffer_info_init_bh(tb, &bi, tb->S_new[i]);
1012 leaf_insert_into_buf(&bi, tb->item_pos - n + tb->snum[i] - 1,
1013 ih, body, tb->zeroes_num);
1014
1015 tb->zeroes_num = tb->insert_size[0] = 0;
1016 }
1017 }
1018
1019 /* we append to directory item */
1020 static void balance_leaf_new_nodes_paste_dirent(struct tree_balance *tb,
1021 struct item_head * const ih,
1022 const char * const body,
1023 struct item_head *insert_key,
1024 struct buffer_head **insert_ptr,
1025 int i)
1026 {
1027 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1028 struct item_head *aux_ih = item_head(tbS0, tb->item_pos);
1029 int entry_count = ih_entry_count(aux_ih);
1030 struct buffer_info bi;
1031
1032 if (entry_count - tb->sbytes[i] < tb->pos_in_item &&
1033 tb->pos_in_item <= entry_count) {
1034 /* new directory entry falls into S_new[i] */
1035
1036 RFALSE(!tb->insert_size[0],
1037 "PAP-12215: insert_size is already 0");
1038 RFALSE(tb->sbytes[i] - 1 >= entry_count,
1039 "PAP-12220: there are no so much entries (%d), only %d",
1040 tb->sbytes[i] - 1, entry_count);
1041
1042 /*
1043 * Shift snum[i]-1 items in whole.
1044 * Shift sbytes[i] directory entries
1045 * from directory item number snum[i]
1046 */
1047 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
1048 tb->sbytes[i] - 1, tb->S_new[i]);
1049
1050 /*
1051 * Paste given directory entry to
1052 * directory item
1053 */
1054 buffer_info_init_bh(tb, &bi, tb->S_new[i]);
1055 leaf_paste_in_buffer(&bi, 0, tb->pos_in_item - entry_count +
1056 tb->sbytes[i] - 1, tb->insert_size[0],
1057 body, tb->zeroes_num);
1058
1059 /* paste new directory entry */
1060 leaf_paste_entries(&bi, 0, tb->pos_in_item - entry_count +
1061 tb->sbytes[i] - 1, 1,
1062 (struct reiserfs_de_head *) body,
1063 body + DEH_SIZE, tb->insert_size[0]);
1064
1065 tb->insert_size[0] = 0;
1066 tb->pos_in_item++;
1067 } else {
1068 /* new directory entry doesn't fall into S_new[i] */
1069 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
1070 tb->sbytes[i], tb->S_new[i]);
1071 }
1072
1073 }
1074
1075 static void balance_leaf_new_nodes_paste_shift(struct tree_balance *tb,
1076 struct item_head * const ih,
1077 const char * const body,
1078 struct item_head *insert_key,
1079 struct buffer_head **insert_ptr,
1080 int i)
1081 {
1082 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1083 struct item_head *aux_ih = item_head(tbS0, tb->item_pos);
1084 int n_shift, n_rem, r_zeroes_number, shift;
1085 const char *r_body;
1086 struct item_head *tmp;
1087 struct buffer_info bi;
1088
1089 RFALSE(ih, "PAP-12210: ih must be 0");
1090
1091 if (is_direntry_le_ih(aux_ih)) {
1092 balance_leaf_new_nodes_paste_dirent(tb, ih, body, insert_key,
1093 insert_ptr, i);
1094 return;
1095 }
1096
1097 /* regular object */
1098
1099
1100 RFALSE(tb->pos_in_item != ih_item_len(item_head(tbS0, tb->item_pos)) ||
1101 tb->insert_size[0] <= 0,
1102 "PAP-12225: item too short or insert_size <= 0");
1103
1104 /*
1105 * Calculate number of bytes which must be shifted from appended item
1106 */
1107 n_shift = tb->sbytes[i] - tb->insert_size[0];
1108 if (n_shift < 0)
1109 n_shift = 0;
1110 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i], n_shift,
1111 tb->S_new[i]);
1112
1113 /*
1114 * Calculate number of bytes which must remain in body after
1115 * append to S_new[i]
1116 */
1117 n_rem = tb->insert_size[0] - tb->sbytes[i];
1118 if (n_rem < 0)
1119 n_rem = 0;
1120
1121 /* Append part of body into S_new[0] */
1122 buffer_info_init_bh(tb, &bi, tb->S_new[i]);
1123 if (n_rem > tb->zeroes_num) {
1124 r_zeroes_number = 0;
1125 r_body = body + n_rem - tb->zeroes_num;
1126 } else {
1127 r_body = body;
1128 r_zeroes_number = tb->zeroes_num - n_rem;
1129 tb->zeroes_num -= r_zeroes_number;
1130 }
1131
1132 leaf_paste_in_buffer(&bi, 0, n_shift, tb->insert_size[0] - n_rem,
1133 r_body, r_zeroes_number);
1134
1135 tmp = item_head(tb->S_new[i], 0);
1136 shift = 0;
1137 if (is_indirect_le_ih(tmp)) {
1138 set_ih_free_space(tmp, 0);
1139 shift = tb->tb_sb->s_blocksize_bits - UNFM_P_SHIFT;
1140 }
1141 add_le_ih_k_offset(tmp, n_rem << shift);
1142
1143 tb->insert_size[0] = n_rem;
1144 if (!n_rem)
1145 tb->pos_in_item++;
1146 }
1147
1148 static void balance_leaf_new_nodes_paste_whole(struct tree_balance *tb,
1149 struct item_head * const ih,
1150 const char * const body,
1151 struct item_head *insert_key,
1152 struct buffer_head **insert_ptr,
1153 int i)
1154
1155 {
1156 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1157 int n = B_NR_ITEMS(tbS0);
1158 int leaf_mi;
1159 struct item_head *pasted;
1160 struct buffer_info bi;
1161
1162 #ifdef CONFIG_REISERFS_CHECK
1163 struct item_head *ih_check = item_head(tbS0, tb->item_pos);
1164
1165 if (!is_direntry_le_ih(ih_check) &&
1166 (tb->pos_in_item != ih_item_len(ih_check) ||
1167 tb->insert_size[0] <= 0))
1168 reiserfs_panic(tb->tb_sb,
1169 "PAP-12235",
1170 "pos_in_item must be equal to ih_item_len");
1171 #endif
1172
1173 leaf_mi = leaf_move_items(LEAF_FROM_S_TO_SNEW, tb, tb->snum[i],
1174 tb->sbytes[i], tb->S_new[i]);
1175
1176 RFALSE(leaf_mi,
1177 "PAP-12240: unexpected value returned by leaf_move_items (%d)",
1178 leaf_mi);
1179
1180 /* paste into item */
1181 buffer_info_init_bh(tb, &bi, tb->S_new[i]);
1182 leaf_paste_in_buffer(&bi, tb->item_pos - n + tb->snum[i],
1183 tb->pos_in_item, tb->insert_size[0],
1184 body, tb->zeroes_num);
1185
1186 pasted = item_head(tb->S_new[i], tb->item_pos - n +
1187 tb->snum[i]);
1188 if (is_direntry_le_ih(pasted))
1189 leaf_paste_entries(&bi, tb->item_pos - n + tb->snum[i],
1190 tb->pos_in_item, 1,
1191 (struct reiserfs_de_head *)body,
1192 body + DEH_SIZE, tb->insert_size[0]);
1193
1194 /* if we paste to indirect item update ih_free_space */
1195 if (is_indirect_le_ih(pasted))
1196 set_ih_free_space(pasted, 0);
1197
1198 tb->zeroes_num = tb->insert_size[0] = 0;
1199
1200 }
1201 static void balance_leaf_new_nodes_paste(struct tree_balance *tb,
1202 struct item_head * const ih,
1203 const char * const body,
1204 struct item_head *insert_key,
1205 struct buffer_head **insert_ptr,
1206 int i)
1207 {
1208 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1209 int n = B_NR_ITEMS(tbS0);
1210
1211 /* pasted item doesn't fall into S_new[i] */
1212 if (n - tb->snum[i] > tb->item_pos) {
1213 leaf_move_items(LEAF_FROM_S_TO_SNEW, tb,
1214 tb->snum[i], tb->sbytes[i], tb->S_new[i]);
1215 return;
1216 }
1217
1218 /* pasted item or part if it falls to S_new[i] */
1219
1220 if (tb->item_pos == n - tb->snum[i] && tb->sbytes[i] != -1)
1221 /* we must shift part of the appended item */
1222 balance_leaf_new_nodes_paste_shift(tb, ih, body, insert_key,
1223 insert_ptr, i);
1224 else
1225 /* item falls wholly into S_new[i] */
1226 balance_leaf_new_nodes_paste_whole(tb, ih, body, insert_key,
1227 insert_ptr, i);
1228 }
1229
1230 /* Fill new nodes that appear in place of S[0] */
1231 static void balance_leaf_new_nodes(struct tree_balance *tb,
1232 struct item_head * const ih,
1233 const char * const body,
1234 struct item_head *insert_key,
1235 struct buffer_head **insert_ptr,
1236 int flag)
1237 {
1238 int i;
1239 for (i = tb->blknum[0] - 2; i >= 0; i--) {
1240 BUG_ON(flag != M_INSERT && flag != M_PASTE);
1241
1242 RFALSE(!tb->snum[i],
1243 "PAP-12200: snum[%d] == %d. Must be > 0", i,
1244 tb->snum[i]);
1245
1246 /* here we shift from S to S_new nodes */
1247
1248 tb->S_new[i] = get_FEB(tb);
1249
1250 /* initialized block type and tree level */
1251 set_blkh_level(B_BLK_HEAD(tb->S_new[i]), DISK_LEAF_NODE_LEVEL);
1252
1253 if (flag == M_INSERT)
1254 balance_leaf_new_nodes_insert(tb, ih, body, insert_key,
1255 insert_ptr, i);
1256 else /* M_PASTE */
1257 balance_leaf_new_nodes_paste(tb, ih, body, insert_key,
1258 insert_ptr, i);
1259
1260 memcpy(insert_key + i, leaf_key(tb->S_new[i], 0), KEY_SIZE);
1261 insert_ptr[i] = tb->S_new[i];
1262
1263 RFALSE(!buffer_journaled(tb->S_new[i])
1264 || buffer_journal_dirty(tb->S_new[i])
1265 || buffer_dirty(tb->S_new[i]),
1266 "PAP-12247: S_new[%d] : (%b)",
1267 i, tb->S_new[i]);
1268 }
1269 }
1270
1271 static void balance_leaf_finish_node_insert(struct tree_balance *tb,
1272 struct item_head * const ih,
1273 const char * const body)
1274 {
1275 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1276 struct buffer_info bi;
1277 buffer_info_init_tbS0(tb, &bi);
1278 leaf_insert_into_buf(&bi, tb->item_pos, ih, body, tb->zeroes_num);
1279
1280 /* If we insert the first key change the delimiting key */
1281 if (tb->item_pos == 0) {
1282 if (tb->CFL[0]) /* can be 0 in reiserfsck */
1283 replace_key(tb, tb->CFL[0], tb->lkey[0], tbS0, 0);
1284
1285 }
1286 }
1287
1288 static void balance_leaf_finish_node_paste_dirent(struct tree_balance *tb,
1289 struct item_head * const ih,
1290 const char * const body)
1291 {
1292 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1293 struct item_head *pasted = item_head(tbS0, tb->item_pos);
1294 struct buffer_info bi;
1295
1296 if (tb->pos_in_item >= 0 && tb->pos_in_item <= ih_entry_count(pasted)) {
1297 RFALSE(!tb->insert_size[0],
1298 "PAP-12260: insert_size is 0 already");
1299
1300 /* prepare space */
1301 buffer_info_init_tbS0(tb, &bi);
1302 leaf_paste_in_buffer(&bi, tb->item_pos, tb->pos_in_item,
1303 tb->insert_size[0], body, tb->zeroes_num);
1304
1305 /* paste entry */
1306 leaf_paste_entries(&bi, tb->item_pos, tb->pos_in_item, 1,
1307 (struct reiserfs_de_head *)body,
1308 body + DEH_SIZE, tb->insert_size[0]);
1309
1310 if (!tb->item_pos && !tb->pos_in_item) {
1311 RFALSE(!tb->CFL[0] || !tb->L[0],
1312 "PAP-12270: CFL[0]/L[0] must be specified");
1313 if (tb->CFL[0])
1314 replace_key(tb, tb->CFL[0], tb->lkey[0],
1315 tbS0, 0);
1316 }
1317
1318 tb->insert_size[0] = 0;
1319 }
1320 }
1321
1322 static void balance_leaf_finish_node_paste(struct tree_balance *tb,
1323 struct item_head * const ih,
1324 const char * const body)
1325 {
1326 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1327 struct buffer_info bi;
1328 struct item_head *pasted = item_head(tbS0, tb->item_pos);
1329
1330 /* when directory, may be new entry already pasted */
1331 if (is_direntry_le_ih(pasted)) {
1332 balance_leaf_finish_node_paste_dirent(tb, ih, body);
1333 return;
1334 }
1335
1336 /* regular object */
1337
1338 if (tb->pos_in_item == ih_item_len(pasted)) {
1339 RFALSE(tb->insert_size[0] <= 0,
1340 "PAP-12275: insert size must not be %d",
1341 tb->insert_size[0]);
1342 buffer_info_init_tbS0(tb, &bi);
1343 leaf_paste_in_buffer(&bi, tb->item_pos,
1344 tb->pos_in_item, tb->insert_size[0], body,
1345 tb->zeroes_num);
1346
1347 if (is_indirect_le_ih(pasted))
1348 set_ih_free_space(pasted, 0);
1349
1350 tb->insert_size[0] = 0;
1351 }
1352 #ifdef CONFIG_REISERFS_CHECK
1353 else if (tb->insert_size[0]) {
1354 print_cur_tb("12285");
1355 reiserfs_panic(tb->tb_sb, "PAP-12285",
1356 "insert_size must be 0 (%d)", tb->insert_size[0]);
1357 }
1358 #endif
1359 }
1360
1361 /*
1362 * if the affected item was not wholly shifted then we
1363 * perform all necessary operations on that part or whole
1364 * of the affected item which remains in S
1365 */
1366 static void balance_leaf_finish_node(struct tree_balance *tb,
1367 struct item_head * const ih,
1368 const char * const body, int flag)
1369 {
1370 /* if we must insert or append into buffer S[0] */
1371 if (0 <= tb->item_pos && tb->item_pos < tb->s0num) {
1372 if (flag == M_INSERT)
1373 balance_leaf_finish_node_insert(tb, ih, body);
1374 else /* M_PASTE */
1375 balance_leaf_finish_node_paste(tb, ih, body);
1376 }
1377 }
1378
1379 /**
1380 * balance_leaf - reiserfs tree balancing algorithm
1381 * @tb: tree balance state
1382 * @ih: item header of inserted item (little endian)
1383 * @body: body of inserted item or bytes to paste
1384 * @flag: i - insert, d - delete, c - cut, p - paste (see do_balance)
1385 * passed back:
1386 * @insert_key: key to insert new nodes
1387 * @insert_ptr: array of nodes to insert at the next level
1388 *
1389 * In our processing of one level we sometimes determine what must be
1390 * inserted into the next higher level. This insertion consists of a
1391 * key or two keys and their corresponding pointers.
1392 */
1393 static int balance_leaf(struct tree_balance *tb, struct item_head *ih,
1394 const char *body, int flag,
1395 struct item_head *insert_key,
1396 struct buffer_head **insert_ptr)
1397 {
1398 struct buffer_head *tbS0 = PATH_PLAST_BUFFER(tb->tb_path);
1399
1400 PROC_INFO_INC(tb->tb_sb, balance_at[0]);
1401
1402 /* Make balance in case insert_size[0] < 0 */
1403 if (tb->insert_size[0] < 0)
1404 return balance_leaf_when_delete(tb, flag);
1405
1406 tb->item_pos = PATH_LAST_POSITION(tb->tb_path),
1407 tb->pos_in_item = tb->tb_path->pos_in_item,
1408 tb->zeroes_num = 0;
1409 if (flag == M_INSERT && !body)
1410 tb->zeroes_num = ih_item_len(ih);
1411
1412 /*
1413 * for indirect item pos_in_item is measured in unformatted node
1414 * pointers. Recalculate to bytes
1415 */
1416 if (flag != M_INSERT
1417 && is_indirect_le_ih(item_head(tbS0, tb->item_pos)))
1418 tb->pos_in_item *= UNFM_P_SIZE;
1419
1420 body += balance_leaf_left(tb, ih, body, flag);
1421
1422 /* tb->lnum[0] > 0 */
1423 /* Calculate new item position */
1424 tb->item_pos -= (tb->lnum[0] - ((tb->lbytes != -1) ? 1 : 0));
1425
1426 balance_leaf_right(tb, ih, body, flag);
1427
1428 /* tb->rnum[0] > 0 */
1429 RFALSE(tb->blknum[0] > 3,
1430 "PAP-12180: blknum can not be %d. It must be <= 3", tb->blknum[0]);
1431 RFALSE(tb->blknum[0] < 0,
1432 "PAP-12185: blknum can not be %d. It must be >= 0", tb->blknum[0]);
1433
1434 /*
1435 * if while adding to a node we discover that it is possible to split
1436 * it in two, and merge the left part into the left neighbor and the
1437 * right part into the right neighbor, eliminating the node
1438 */
1439 if (tb->blknum[0] == 0) { /* node S[0] is empty now */
1440
1441 RFALSE(!tb->lnum[0] || !tb->rnum[0],
1442 "PAP-12190: lnum and rnum must not be zero");
1443 /*
1444 * if insertion was done before 0-th position in R[0], right
1445 * delimiting key of the tb->L[0]'s and left delimiting key are
1446 * not set correctly
1447 */
1448 if (tb->CFL[0]) {
1449 if (!tb->CFR[0])
1450 reiserfs_panic(tb->tb_sb, "vs-12195",
1451 "CFR not initialized");
1452 copy_key(internal_key(tb->CFL[0], tb->lkey[0]),
1453 internal_key(tb->CFR[0], tb->rkey[0]));
1454 do_balance_mark_internal_dirty(tb, tb->CFL[0], 0);
1455 }
1456
1457 reiserfs_invalidate_buffer(tb, tbS0);
1458 return 0;
1459 }
1460
1461 balance_leaf_new_nodes(tb, ih, body, insert_key, insert_ptr, flag);
1462
1463 balance_leaf_finish_node(tb, ih, body, flag);
1464
1465 #ifdef CONFIG_REISERFS_CHECK
1466 if (flag == M_PASTE && tb->insert_size[0]) {
1467 print_cur_tb("12290");
1468 reiserfs_panic(tb->tb_sb,
1469 "PAP-12290", "insert_size is still not 0 (%d)",
1470 tb->insert_size[0]);
1471 }
1472 #endif
1473
1474 /* Leaf level of the tree is balanced (end of balance_leaf) */
1475 return 0;
1476 }
1477
1478 /* Make empty node */
1479 void make_empty_node(struct buffer_info *bi)
1480 {
1481 struct block_head *blkh;
1482
1483 RFALSE(bi->bi_bh == NULL, "PAP-12295: pointer to the buffer is NULL");
1484
1485 blkh = B_BLK_HEAD(bi->bi_bh);
1486 set_blkh_nr_item(blkh, 0);
1487 set_blkh_free_space(blkh, MAX_CHILD_SIZE(bi->bi_bh));
1488
1489 if (bi->bi_parent)
1490 B_N_CHILD(bi->bi_parent, bi->bi_position)->dc_size = 0; /* Endian safe if 0 */
1491 }
1492
1493 /* Get first empty buffer */
1494 struct buffer_head *get_FEB(struct tree_balance *tb)
1495 {
1496 int i;
1497 struct buffer_info bi;
1498
1499 for (i = 0; i < MAX_FEB_SIZE; i++)
1500 if (tb->FEB[i] != NULL)
1501 break;
1502
1503 if (i == MAX_FEB_SIZE)
1504 reiserfs_panic(tb->tb_sb, "vs-12300", "FEB list is empty");
1505
1506 buffer_info_init_bh(tb, &bi, tb->FEB[i]);
1507 make_empty_node(&bi);
1508 set_buffer_uptodate(tb->FEB[i]);
1509 tb->used[i] = tb->FEB[i];
1510 tb->FEB[i] = NULL;
1511
1512 return tb->used[i];
1513 }
1514
1515 /* This is now used because reiserfs_free_block has to be able to schedule. */
1516 static void store_thrown(struct tree_balance *tb, struct buffer_head *bh)
1517 {
1518 int i;
1519
1520 if (buffer_dirty(bh))
1521 reiserfs_warning(tb->tb_sb, "reiserfs-12320",
1522 "called with dirty buffer");
1523 for (i = 0; i < ARRAY_SIZE(tb->thrown); i++)
1524 if (!tb->thrown[i]) {
1525 tb->thrown[i] = bh;
1526 get_bh(bh); /* free_thrown puts this */
1527 return;
1528 }
1529 reiserfs_warning(tb->tb_sb, "reiserfs-12321",
1530 "too many thrown buffers");
1531 }
1532
1533 static void free_thrown(struct tree_balance *tb)
1534 {
1535 int i;
1536 b_blocknr_t blocknr;
1537 for (i = 0; i < ARRAY_SIZE(tb->thrown); i++) {
1538 if (tb->thrown[i]) {
1539 blocknr = tb->thrown[i]->b_blocknr;
1540 if (buffer_dirty(tb->thrown[i]))
1541 reiserfs_warning(tb->tb_sb, "reiserfs-12322",
1542 "called with dirty buffer %d",
1543 blocknr);
1544 brelse(tb->thrown[i]); /* incremented in store_thrown */
1545 reiserfs_free_block(tb->transaction_handle, NULL,
1546 blocknr, 0);
1547 }
1548 }
1549 }
1550
1551 void reiserfs_invalidate_buffer(struct tree_balance *tb, struct buffer_head *bh)
1552 {
1553 struct block_head *blkh;
1554 blkh = B_BLK_HEAD(bh);
1555 set_blkh_level(blkh, FREE_LEVEL);
1556 set_blkh_nr_item(blkh, 0);
1557
1558 clear_buffer_dirty(bh);
1559 store_thrown(tb, bh);
1560 }
1561
1562 /* Replace n_dest'th key in buffer dest by n_src'th key of buffer src.*/
1563 void replace_key(struct tree_balance *tb, struct buffer_head *dest, int n_dest,
1564 struct buffer_head *src, int n_src)
1565 {
1566
1567 RFALSE(dest == NULL || src == NULL,
1568 "vs-12305: source or destination buffer is 0 (src=%p, dest=%p)",
1569 src, dest);
1570 RFALSE(!B_IS_KEYS_LEVEL(dest),
1571 "vs-12310: invalid level (%z) for destination buffer. dest must be leaf",
1572 dest);
1573 RFALSE(n_dest < 0 || n_src < 0,
1574 "vs-12315: src(%d) or dest(%d) key number < 0", n_src, n_dest);
1575 RFALSE(n_dest >= B_NR_ITEMS(dest) || n_src >= B_NR_ITEMS(src),
1576 "vs-12320: src(%d(%d)) or dest(%d(%d)) key number is too big",
1577 n_src, B_NR_ITEMS(src), n_dest, B_NR_ITEMS(dest));
1578
1579 if (B_IS_ITEMS_LEVEL(src))
1580 /* source buffer contains leaf node */
1581 memcpy(internal_key(dest, n_dest), item_head(src, n_src),
1582 KEY_SIZE);
1583 else
1584 memcpy(internal_key(dest, n_dest), internal_key(src, n_src),
1585 KEY_SIZE);
1586
1587 do_balance_mark_internal_dirty(tb, dest, 0);
1588 }
1589
1590 int get_left_neighbor_position(struct tree_balance *tb, int h)
1591 {
1592 int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1);
1593
1594 RFALSE(PATH_H_PPARENT(tb->tb_path, h) == NULL || tb->FL[h] == NULL,
1595 "vs-12325: FL[%d](%p) or F[%d](%p) does not exist",
1596 h, tb->FL[h], h, PATH_H_PPARENT(tb->tb_path, h));
1597
1598 if (Sh_position == 0)
1599 return B_NR_ITEMS(tb->FL[h]);
1600 else
1601 return Sh_position - 1;
1602 }
1603
1604 int get_right_neighbor_position(struct tree_balance *tb, int h)
1605 {
1606 int Sh_position = PATH_H_POSITION(tb->tb_path, h + 1);
1607
1608 RFALSE(PATH_H_PPARENT(tb->tb_path, h) == NULL || tb->FR[h] == NULL,
1609 "vs-12330: F[%d](%p) or FR[%d](%p) does not exist",
1610 h, PATH_H_PPARENT(tb->tb_path, h), h, tb->FR[h]);
1611
1612 if (Sh_position == B_NR_ITEMS(PATH_H_PPARENT(tb->tb_path, h)))
1613 return 0;
1614 else
1615 return Sh_position + 1;
1616 }
1617
1618 #ifdef CONFIG_REISERFS_CHECK
1619
1620 int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value);
1621 static void check_internal_node(struct super_block *s, struct buffer_head *bh,
1622 char *mes)
1623 {
1624 struct disk_child *dc;
1625 int i;
1626
1627 RFALSE(!bh, "PAP-12336: bh == 0");
1628
1629 if (!bh || !B_IS_IN_TREE(bh))
1630 return;
1631
1632 RFALSE(!buffer_dirty(bh) &&
1633 !(buffer_journaled(bh) || buffer_journal_dirty(bh)),
1634 "PAP-12337: buffer (%b) must be dirty", bh);
1635 dc = B_N_CHILD(bh, 0);
1636
1637 for (i = 0; i <= B_NR_ITEMS(bh); i++, dc++) {
1638 if (!is_reusable(s, dc_block_number(dc), 1)) {
1639 print_cur_tb(mes);
1640 reiserfs_panic(s, "PAP-12338",
1641 "invalid child pointer %y in %b",
1642 dc, bh);
1643 }
1644 }
1645 }
1646
1647 static int locked_or_not_in_tree(struct tree_balance *tb,
1648 struct buffer_head *bh, char *which)
1649 {
1650 if ((!buffer_journal_prepared(bh) && buffer_locked(bh)) ||
1651 !B_IS_IN_TREE(bh)) {
1652 reiserfs_warning(tb->tb_sb, "vs-12339", "%s (%b)", which, bh);
1653 return 1;
1654 }
1655 return 0;
1656 }
1657
1658 static int check_before_balancing(struct tree_balance *tb)
1659 {
1660 int retval = 0;
1661
1662 if (REISERFS_SB(tb->tb_sb)->cur_tb) {
1663 reiserfs_panic(tb->tb_sb, "vs-12335", "suspect that schedule "
1664 "occurred based on cur_tb not being null at "
1665 "this point in code. do_balance cannot properly "
1666 "handle concurrent tree accesses on a same "
1667 "mount point.");
1668 }
1669
1670 /*
1671 * double check that buffers that we will modify are unlocked.
1672 * (fix_nodes should already have prepped all of these for us).
1673 */
1674 if (tb->lnum[0]) {
1675 retval |= locked_or_not_in_tree(tb, tb->L[0], "L[0]");
1676 retval |= locked_or_not_in_tree(tb, tb->FL[0], "FL[0]");
1677 retval |= locked_or_not_in_tree(tb, tb->CFL[0], "CFL[0]");
1678 check_leaf(tb->L[0]);
1679 }
1680 if (tb->rnum[0]) {
1681 retval |= locked_or_not_in_tree(tb, tb->R[0], "R[0]");
1682 retval |= locked_or_not_in_tree(tb, tb->FR[0], "FR[0]");
1683 retval |= locked_or_not_in_tree(tb, tb->CFR[0], "CFR[0]");
1684 check_leaf(tb->R[0]);
1685 }
1686 retval |= locked_or_not_in_tree(tb, PATH_PLAST_BUFFER(tb->tb_path),
1687 "S[0]");
1688 check_leaf(PATH_PLAST_BUFFER(tb->tb_path));
1689
1690 return retval;
1691 }
1692
1693 static void check_after_balance_leaf(struct tree_balance *tb)
1694 {
1695 if (tb->lnum[0]) {
1696 if (B_FREE_SPACE(tb->L[0]) !=
1697 MAX_CHILD_SIZE(tb->L[0]) -
1698 dc_size(B_N_CHILD
1699 (tb->FL[0], get_left_neighbor_position(tb, 0)))) {
1700 print_cur_tb("12221");
1701 reiserfs_panic(tb->tb_sb, "PAP-12355",
1702 "shift to left was incorrect");
1703 }
1704 }
1705 if (tb->rnum[0]) {
1706 if (B_FREE_SPACE(tb->R[0]) !=
1707 MAX_CHILD_SIZE(tb->R[0]) -
1708 dc_size(B_N_CHILD
1709 (tb->FR[0], get_right_neighbor_position(tb, 0)))) {
1710 print_cur_tb("12222");
1711 reiserfs_panic(tb->tb_sb, "PAP-12360",
1712 "shift to right was incorrect");
1713 }
1714 }
1715 if (PATH_H_PBUFFER(tb->tb_path, 1) &&
1716 (B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0)) !=
1717 (MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) -
1718 dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1),
1719 PATH_H_POSITION(tb->tb_path, 1)))))) {
1720 int left = B_FREE_SPACE(PATH_H_PBUFFER(tb->tb_path, 0));
1721 int right = (MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)) -
1722 dc_size(B_N_CHILD(PATH_H_PBUFFER(tb->tb_path, 1),
1723 PATH_H_POSITION(tb->tb_path,
1724 1))));
1725 print_cur_tb("12223");
1726 reiserfs_warning(tb->tb_sb, "reiserfs-12363",
1727 "B_FREE_SPACE (PATH_H_PBUFFER(tb->tb_path,0)) = %d; "
1728 "MAX_CHILD_SIZE (%d) - dc_size( %y, %d ) [%d] = %d",
1729 left,
1730 MAX_CHILD_SIZE(PATH_H_PBUFFER(tb->tb_path, 0)),
1731 PATH_H_PBUFFER(tb->tb_path, 1),
1732 PATH_H_POSITION(tb->tb_path, 1),
1733 dc_size(B_N_CHILD
1734 (PATH_H_PBUFFER(tb->tb_path, 1),
1735 PATH_H_POSITION(tb->tb_path, 1))),
1736 right);
1737 reiserfs_panic(tb->tb_sb, "PAP-12365", "S is incorrect");
1738 }
1739 }
1740
1741 static void check_leaf_level(struct tree_balance *tb)
1742 {
1743 check_leaf(tb->L[0]);
1744 check_leaf(tb->R[0]);
1745 check_leaf(PATH_PLAST_BUFFER(tb->tb_path));
1746 }
1747
1748 static void check_internal_levels(struct tree_balance *tb)
1749 {
1750 int h;
1751
1752 /* check all internal nodes */
1753 for (h = 1; tb->insert_size[h]; h++) {
1754 check_internal_node(tb->tb_sb, PATH_H_PBUFFER(tb->tb_path, h),
1755 "BAD BUFFER ON PATH");
1756 if (tb->lnum[h])
1757 check_internal_node(tb->tb_sb, tb->L[h], "BAD L");
1758 if (tb->rnum[h])
1759 check_internal_node(tb->tb_sb, tb->R[h], "BAD R");
1760 }
1761
1762 }
1763
1764 #endif
1765
1766 /*
1767 * Now we have all of the buffers that must be used in balancing of
1768 * the tree. We rely on the assumption that schedule() will not occur
1769 * while do_balance works. ( Only interrupt handlers are acceptable.)
1770 * We balance the tree according to the analysis made before this,
1771 * using buffers already obtained. For SMP support it will someday be
1772 * necessary to add ordered locking of tb.
1773 */
1774
1775 /*
1776 * Some interesting rules of balancing:
1777 * we delete a maximum of two nodes per level per balancing: we never
1778 * delete R, when we delete two of three nodes L, S, R then we move
1779 * them into R.
1780 *
1781 * we only delete L if we are deleting two nodes, if we delete only
1782 * one node we delete S
1783 *
1784 * if we shift leaves then we shift as much as we can: this is a
1785 * deliberate policy of extremism in node packing which results in
1786 * higher average utilization after repeated random balance operations
1787 * at the cost of more memory copies and more balancing as a result of
1788 * small insertions to full nodes.
1789 *
1790 * if we shift internal nodes we try to evenly balance the node
1791 * utilization, with consequent less balancing at the cost of lower
1792 * utilization.
1793 *
1794 * one could argue that the policy for directories in leaves should be
1795 * that of internal nodes, but we will wait until another day to
1796 * evaluate this.... It would be nice to someday measure and prove
1797 * these assumptions as to what is optimal....
1798 */
1799
1800 static inline void do_balance_starts(struct tree_balance *tb)
1801 {
1802 /* use print_cur_tb() to see initial state of struct tree_balance */
1803
1804 /* store_print_tb (tb); */
1805
1806 /* do not delete, just comment it out */
1807 /*
1808 print_tb(flag, PATH_LAST_POSITION(tb->tb_path),
1809 tb->tb_path->pos_in_item, tb, "check");
1810 */
1811 RFALSE(check_before_balancing(tb), "PAP-12340: locked buffers in TB");
1812 #ifdef CONFIG_REISERFS_CHECK
1813 REISERFS_SB(tb->tb_sb)->cur_tb = tb;
1814 #endif
1815 }
1816
1817 static inline void do_balance_completed(struct tree_balance *tb)
1818 {
1819
1820 #ifdef CONFIG_REISERFS_CHECK
1821 check_leaf_level(tb);
1822 check_internal_levels(tb);
1823 REISERFS_SB(tb->tb_sb)->cur_tb = NULL;
1824 #endif
1825
1826 /*
1827 * reiserfs_free_block is no longer schedule safe. So, we need to
1828 * put the buffers we want freed on the thrown list during do_balance,
1829 * and then free them now
1830 */
1831
1832 REISERFS_SB(tb->tb_sb)->s_do_balance++;
1833
1834 /* release all nodes hold to perform the balancing */
1835 unfix_nodes(tb);
1836
1837 free_thrown(tb);
1838 }
1839
1840 /*
1841 * do_balance - balance the tree
1842 *
1843 * @tb: tree_balance structure
1844 * @ih: item header of inserted item
1845 * @body: body of inserted item or bytes to paste
1846 * @flag: 'i' - insert, 'd' - delete, 'c' - cut, 'p' paste
1847 *
1848 * Cut means delete part of an item (includes removing an entry from a
1849 * directory).
1850 *
1851 * Delete means delete whole item.
1852 *
1853 * Insert means add a new item into the tree.
1854 *
1855 * Paste means to append to the end of an existing file or to
1856 * insert a directory entry.
1857 */
1858 void do_balance(struct tree_balance *tb, struct item_head *ih,
1859 const char *body, int flag)
1860 {
1861 int child_pos; /* position of a child node in its parent */
1862 int h; /* level of the tree being processed */
1863
1864 /*
1865 * in our processing of one level we sometimes determine what
1866 * must be inserted into the next higher level. This insertion
1867 * consists of a key or two keys and their corresponding
1868 * pointers
1869 */
1870 struct item_head insert_key[2];
1871
1872 /* inserted node-ptrs for the next level */
1873 struct buffer_head *insert_ptr[2];
1874
1875 tb->tb_mode = flag;
1876 tb->need_balance_dirty = 0;
1877
1878 if (FILESYSTEM_CHANGED_TB(tb)) {
1879 reiserfs_panic(tb->tb_sb, "clm-6000", "fs generation has "
1880 "changed");
1881 }
1882 /* if we have no real work to do */
1883 if (!tb->insert_size[0]) {
1884 reiserfs_warning(tb->tb_sb, "PAP-12350",
1885 "insert_size == 0, mode == %c", flag);
1886 unfix_nodes(tb);
1887 return;
1888 }
1889
1890 atomic_inc(&fs_generation(tb->tb_sb));
1891 do_balance_starts(tb);
1892
1893 /*
1894 * balance_leaf returns 0 except if combining L R and S into
1895 * one node. see balance_internal() for explanation of this
1896 * line of code.
1897 */
1898 child_pos = PATH_H_B_ITEM_ORDER(tb->tb_path, 0) +
1899 balance_leaf(tb, ih, body, flag, insert_key, insert_ptr);
1900
1901 #ifdef CONFIG_REISERFS_CHECK
1902 check_after_balance_leaf(tb);
1903 #endif
1904
1905 /* Balance internal level of the tree. */
1906 for (h = 1; h < MAX_HEIGHT && tb->insert_size[h]; h++)
1907 child_pos = balance_internal(tb, h, child_pos, insert_key,
1908 insert_ptr);
1909
1910 do_balance_completed(tb);
1911 }
Linux with added FPC-III support