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Linux 4.2.1
[linux/fpc-iii.git] / fs / reiserfs / lbalance.c
blob249594a821e0a5e8c60d96c7cad0cd841fccd70b
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
5 #include <linux/uaccess.h>
6 #include <linux/string.h>
7 #include <linux/time.h>
8 #include "reiserfs.h"
9 #include <linux/buffer_head.h>
10
11 /*
12 * copy copy_count entries from source directory item to dest buffer
13 * (creating new item if needed)
14 */
15 static void leaf_copy_dir_entries(struct buffer_info *dest_bi,
16 struct buffer_head *source, int last_first,
17 int item_num, int from, int copy_count)
18 {
19 struct buffer_head *dest = dest_bi->bi_bh;
20 /*
21 * either the number of target item, or if we must create a
22 * new item, the number of the item we will create it next to
23 */
24 int item_num_in_dest;
25
26 struct item_head *ih;
27 struct reiserfs_de_head *deh;
28 int copy_records_len; /* length of all records in item to be copied */
29 char *records;
30
31 ih = item_head(source, item_num);
32
33 RFALSE(!is_direntry_le_ih(ih), "vs-10000: item must be directory item");
34
35 /*
36 * length of all record to be copied and first byte of
37 * the last of them
38 */
39 deh = B_I_DEH(source, ih);
40 if (copy_count) {
41 copy_records_len = (from ? deh_location(&deh[from - 1]) :
42 ih_item_len(ih)) -
43 deh_location(&deh[from + copy_count - 1]);
44 records =
45 source->b_data + ih_location(ih) +
46 deh_location(&deh[from + copy_count - 1]);
47 } else {
48 copy_records_len = 0;
49 records = NULL;
50 }
51
52 /* when copy last to first, dest buffer can contain 0 items */
53 item_num_in_dest =
54 (last_first ==
55 LAST_TO_FIRST) ? ((B_NR_ITEMS(dest)) ? 0 : -1) : (B_NR_ITEMS(dest)
56 - 1);
57
58 /*
59 * if there are no items in dest or the first/last item in
60 * dest is not item of the same directory
61 */
62 if ((item_num_in_dest == -1) ||
63 (last_first == FIRST_TO_LAST && le_ih_k_offset(ih) == DOT_OFFSET) ||
64 (last_first == LAST_TO_FIRST
65 && comp_short_le_keys /*COMP_SHORT_KEYS */ (&ih->ih_key,
66 leaf_key(dest,
67 item_num_in_dest))))
68 {
69 /* create new item in dest */
70 struct item_head new_ih;
71
72 /* form item header */
73 memcpy(&new_ih.ih_key, &ih->ih_key, KEY_SIZE);
74 put_ih_version(&new_ih, KEY_FORMAT_3_5);
75 /* calculate item len */
76 put_ih_item_len(&new_ih,
77 DEH_SIZE * copy_count + copy_records_len);
78 put_ih_entry_count(&new_ih, 0);
79
80 if (last_first == LAST_TO_FIRST) {
81 /* form key by the following way */
82 if (from < ih_entry_count(ih)) {
83 set_le_ih_k_offset(&new_ih,
84 deh_offset(&deh[from]));
85 } else {
86 /*
87 * no entries will be copied to this
88 * item in this function
89 */
90 set_le_ih_k_offset(&new_ih, U32_MAX);
91 /*
92 * this item is not yet valid, but we
93 * want I_IS_DIRECTORY_ITEM to return 1
94 * for it, so we -1
95 */
96 }
97 set_le_key_k_type(KEY_FORMAT_3_5, &new_ih.ih_key,
98 TYPE_DIRENTRY);
99 }
100
101 /* insert item into dest buffer */
102 leaf_insert_into_buf(dest_bi,
103 (last_first ==
104 LAST_TO_FIRST) ? 0 : B_NR_ITEMS(dest),
105 &new_ih, NULL, 0);
106 } else {
107 /* prepare space for entries */
108 leaf_paste_in_buffer(dest_bi,
109 (last_first ==
110 FIRST_TO_LAST) ? (B_NR_ITEMS(dest) -
111 1) : 0, MAX_US_INT,
112 DEH_SIZE * copy_count + copy_records_len,
113 records, 0);
114 }
115
116 item_num_in_dest =
117 (last_first == FIRST_TO_LAST) ? (B_NR_ITEMS(dest) - 1) : 0;
118
119 leaf_paste_entries(dest_bi, item_num_in_dest,
120 (last_first ==
121 FIRST_TO_LAST) ? ih_entry_count(item_head(dest,
122 item_num_in_dest))
123 : 0, copy_count, deh + from, records,
124 DEH_SIZE * copy_count + copy_records_len);
125 }
126
127 /*
128 * Copy the first (if last_first == FIRST_TO_LAST) or last
129 * (last_first == LAST_TO_FIRST) item or part of it or nothing
130 * (see the return 0 below) from SOURCE to the end (if last_first)
131 * or beginning (!last_first) of the DEST
132 */
133 /* returns 1 if anything was copied, else 0 */
134 static int leaf_copy_boundary_item(struct buffer_info *dest_bi,
135 struct buffer_head *src, int last_first,
136 int bytes_or_entries)
137 {
138 struct buffer_head *dest = dest_bi->bi_bh;
139 /* number of items in the source and destination buffers */
140 int dest_nr_item, src_nr_item;
141 struct item_head *ih;
142 struct item_head *dih;
143
144 dest_nr_item = B_NR_ITEMS(dest);
145
146 /*
147 * if ( DEST is empty or first item of SOURCE and last item of
148 * DEST are the items of different objects or of different types )
149 * then there is no need to treat this item differently from the
150 * other items that we copy, so we return
151 */
152 if (last_first == FIRST_TO_LAST) {
153 ih = item_head(src, 0);
154 dih = item_head(dest, dest_nr_item - 1);
155
156 /* there is nothing to merge */
157 if (!dest_nr_item
158 || (!op_is_left_mergeable(&ih->ih_key, src->b_size)))
159 return 0;
160
161 RFALSE(!ih_item_len(ih),
162 "vs-10010: item can not have empty length");
163
164 if (is_direntry_le_ih(ih)) {
165 if (bytes_or_entries == -1)
166 /* copy all entries to dest */
167 bytes_or_entries = ih_entry_count(ih);
168 leaf_copy_dir_entries(dest_bi, src, FIRST_TO_LAST, 0, 0,
169 bytes_or_entries);
170 return 1;
171 }
172
173 /*
174 * copy part of the body of the first item of SOURCE
175 * to the end of the body of the last item of the DEST
176 * part defined by 'bytes_or_entries'; if bytes_or_entries
177 * == -1 copy whole body; don't create new item header
178 */
179 if (bytes_or_entries == -1)
180 bytes_or_entries = ih_item_len(ih);
181
182 #ifdef CONFIG_REISERFS_CHECK
183 else {
184 if (bytes_or_entries == ih_item_len(ih)
185 && is_indirect_le_ih(ih))
186 if (get_ih_free_space(ih))
187 reiserfs_panic(sb_from_bi(dest_bi),
188 "vs-10020",
189 "last unformatted node "
190 "must be filled "
191 "entirely (%h)", ih);
192 }
193 #endif
194
195 /*
196 * merge first item (or its part) of src buffer with the last
197 * item of dest buffer. Both are of the same file
198 */
199 leaf_paste_in_buffer(dest_bi,
200 dest_nr_item - 1, ih_item_len(dih),
201 bytes_or_entries, ih_item_body(src, ih), 0);
202
203 if (is_indirect_le_ih(dih)) {
204 RFALSE(get_ih_free_space(dih),
205 "vs-10030: merge to left: last unformatted node of non-last indirect item %h must have zerto free space",
206 ih);
207 if (bytes_or_entries == ih_item_len(ih))
208 set_ih_free_space(dih, get_ih_free_space(ih));
209 }
210
211 return 1;
212 }
213
214 /* copy boundary item to right (last_first == LAST_TO_FIRST) */
215
216 /*
217 * (DEST is empty or last item of SOURCE and first item of DEST
218 * are the items of different object or of different types)
219 */
220 src_nr_item = B_NR_ITEMS(src);
221 ih = item_head(src, src_nr_item - 1);
222 dih = item_head(dest, 0);
223
224 if (!dest_nr_item || !op_is_left_mergeable(&dih->ih_key, src->b_size))
225 return 0;
226
227 if (is_direntry_le_ih(ih)) {
228 /*
229 * bytes_or_entries = entries number in last
230 * item body of SOURCE
231 */
232 if (bytes_or_entries == -1)
233 bytes_or_entries = ih_entry_count(ih);
234
235 leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST,
236 src_nr_item - 1,
237 ih_entry_count(ih) - bytes_or_entries,
238 bytes_or_entries);
239 return 1;
240 }
241
242 /*
243 * copy part of the body of the last item of SOURCE to the
244 * begin of the body of the first item of the DEST; part defined
245 * by 'bytes_or_entries'; if byte_or_entriess == -1 copy whole body;
246 * change first item key of the DEST; don't create new item header
247 */
248
249 RFALSE(is_indirect_le_ih(ih) && get_ih_free_space(ih),
250 "vs-10040: merge to right: last unformatted node of non-last indirect item must be filled entirely (%h)",
251 ih);
252
253 if (bytes_or_entries == -1) {
254 /* bytes_or_entries = length of last item body of SOURCE */
255 bytes_or_entries = ih_item_len(ih);
256
257 RFALSE(le_ih_k_offset(dih) !=
258 le_ih_k_offset(ih) + op_bytes_number(ih, src->b_size),
259 "vs-10050: items %h and %h do not match", ih, dih);
260
261 /* change first item key of the DEST */
262 set_le_ih_k_offset(dih, le_ih_k_offset(ih));
263
264 /* item becomes non-mergeable */
265 /* or mergeable if left item was */
266 set_le_ih_k_type(dih, le_ih_k_type(ih));
267 } else {
268 /* merge to right only part of item */
269 RFALSE(ih_item_len(ih) <= bytes_or_entries,
270 "vs-10060: no so much bytes %lu (needed %lu)",
271 (unsigned long)ih_item_len(ih),
272 (unsigned long)bytes_or_entries);
273
274 /* change first item key of the DEST */
275 if (is_direct_le_ih(dih)) {
276 RFALSE(le_ih_k_offset(dih) <=
277 (unsigned long)bytes_or_entries,
278 "vs-10070: dih %h, bytes_or_entries(%d)", dih,
279 bytes_or_entries);
280 set_le_ih_k_offset(dih,
281 le_ih_k_offset(dih) -
282 bytes_or_entries);
283 } else {
284 RFALSE(le_ih_k_offset(dih) <=
285 (bytes_or_entries / UNFM_P_SIZE) * dest->b_size,
286 "vs-10080: dih %h, bytes_or_entries(%d)",
287 dih,
288 (bytes_or_entries / UNFM_P_SIZE) * dest->b_size);
289 set_le_ih_k_offset(dih,
290 le_ih_k_offset(dih) -
291 ((bytes_or_entries / UNFM_P_SIZE) *
292 dest->b_size));
293 }
294 }
295
296 leaf_paste_in_buffer(dest_bi, 0, 0, bytes_or_entries,
297 ih_item_body(src,
298 ih) + ih_item_len(ih) - bytes_or_entries,
299 0);
300 return 1;
301 }
302
303 /*
304 * copy cpy_mun items from buffer src to buffer dest
305 * last_first == FIRST_TO_LAST means, that we copy cpy_num items beginning
306 * from first-th item in src to tail of dest
307 * last_first == LAST_TO_FIRST means, that we copy cpy_num items beginning
308 * from first-th item in src to head of dest
309 */
310 static void leaf_copy_items_entirely(struct buffer_info *dest_bi,
311 struct buffer_head *src, int last_first,
312 int first, int cpy_num)
313 {
314 struct buffer_head *dest;
315 int nr, free_space;
316 int dest_before;
317 int last_loc, last_inserted_loc, location;
318 int i, j;
319 struct block_head *blkh;
320 struct item_head *ih;
321
322 RFALSE(last_first != LAST_TO_FIRST && last_first != FIRST_TO_LAST,
323 "vs-10090: bad last_first parameter %d", last_first);
324 RFALSE(B_NR_ITEMS(src) - first < cpy_num,
325 "vs-10100: too few items in source %d, required %d from %d",
326 B_NR_ITEMS(src), cpy_num, first);
327 RFALSE(cpy_num < 0, "vs-10110: can not copy negative amount of items");
328 RFALSE(!dest_bi, "vs-10120: can not copy negative amount of items");
329
330 dest = dest_bi->bi_bh;
331
332 RFALSE(!dest, "vs-10130: can not copy negative amount of items");
333
334 if (cpy_num == 0)
335 return;
336
337 blkh = B_BLK_HEAD(dest);
338 nr = blkh_nr_item(blkh);
339 free_space = blkh_free_space(blkh);
340
341 /*
342 * we will insert items before 0-th or nr-th item in dest buffer.
343 * It depends of last_first parameter
344 */
345 dest_before = (last_first == LAST_TO_FIRST) ? 0 : nr;
346
347 /* location of head of first new item */
348 ih = item_head(dest, dest_before);
349
350 RFALSE(blkh_free_space(blkh) < cpy_num * IH_SIZE,
351 "vs-10140: not enough free space for headers %d (needed %d)",
352 B_FREE_SPACE(dest), cpy_num * IH_SIZE);
353
354 /* prepare space for headers */
355 memmove(ih + cpy_num, ih, (nr - dest_before) * IH_SIZE);
356
357 /* copy item headers */
358 memcpy(ih, item_head(src, first), cpy_num * IH_SIZE);
359
360 free_space -= (IH_SIZE * cpy_num);
361 set_blkh_free_space(blkh, free_space);
362
363 /* location of unmovable item */
364 j = location = (dest_before == 0) ? dest->b_size : ih_location(ih - 1);
365 for (i = dest_before; i < nr + cpy_num; i++) {
366 location -= ih_item_len(ih + i - dest_before);
367 put_ih_location(ih + i - dest_before, location);
368 }
369
370 /* prepare space for items */
371 last_loc = ih_location(&ih[nr + cpy_num - 1 - dest_before]);
372 last_inserted_loc = ih_location(&ih[cpy_num - 1]);
373
374 /* check free space */
375 RFALSE(free_space < j - last_inserted_loc,
376 "vs-10150: not enough free space for items %d (needed %d)",
377 free_space, j - last_inserted_loc);
378
379 memmove(dest->b_data + last_loc,
380 dest->b_data + last_loc + j - last_inserted_loc,
381 last_inserted_loc - last_loc);
382
383 /* copy items */
384 memcpy(dest->b_data + last_inserted_loc,
385 item_body(src, (first + cpy_num - 1)),
386 j - last_inserted_loc);
387
388 /* sizes, item number */
389 set_blkh_nr_item(blkh, nr + cpy_num);
390 set_blkh_free_space(blkh, free_space - (j - last_inserted_loc));
391
392 do_balance_mark_leaf_dirty(dest_bi->tb, dest, 0);
393
394 if (dest_bi->bi_parent) {
395 struct disk_child *t_dc;
396 t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
397 RFALSE(dc_block_number(t_dc) != dest->b_blocknr,
398 "vs-10160: block number in bh does not match to field in disk_child structure %lu and %lu",
399 (long unsigned)dest->b_blocknr,
400 (long unsigned)dc_block_number(t_dc));
401 put_dc_size(t_dc,
402 dc_size(t_dc) + (j - last_inserted_loc +
403 IH_SIZE * cpy_num));
404
405 do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
406 0);
407 }
408 }
409
410 /*
411 * This function splits the (liquid) item into two items (useful when
412 * shifting part of an item into another node.)
413 */
414 static void leaf_item_bottle(struct buffer_info *dest_bi,
415 struct buffer_head *src, int last_first,
416 int item_num, int cpy_bytes)
417 {
418 struct buffer_head *dest = dest_bi->bi_bh;
419 struct item_head *ih;
420
421 RFALSE(cpy_bytes == -1,
422 "vs-10170: bytes == - 1 means: do not split item");
423
424 if (last_first == FIRST_TO_LAST) {
425 /*
426 * if ( if item in position item_num in buffer SOURCE
427 * is directory item )
428 */
429 ih = item_head(src, item_num);
430 if (is_direntry_le_ih(ih))
431 leaf_copy_dir_entries(dest_bi, src, FIRST_TO_LAST,
432 item_num, 0, cpy_bytes);
433 else {
434 struct item_head n_ih;
435
436 /*
437 * copy part of the body of the item number 'item_num'
438 * of SOURCE to the end of the DEST part defined by
439 * 'cpy_bytes'; create new item header; change old
440 * item_header (????); n_ih = new item_header;
441 */
442 memcpy(&n_ih, ih, IH_SIZE);
443 put_ih_item_len(&n_ih, cpy_bytes);
444 if (is_indirect_le_ih(ih)) {
445 RFALSE(cpy_bytes == ih_item_len(ih)
446 && get_ih_free_space(ih),
447 "vs-10180: when whole indirect item is bottle to left neighbor, it must have free_space==0 (not %lu)",
448 (long unsigned)get_ih_free_space(ih));
449 set_ih_free_space(&n_ih, 0);
450 }
451
452 RFALSE(op_is_left_mergeable(&ih->ih_key, src->b_size),
453 "vs-10190: bad mergeability of item %h", ih);
454 n_ih.ih_version = ih->ih_version; /* JDM Endian safe, both le */
455 leaf_insert_into_buf(dest_bi, B_NR_ITEMS(dest), &n_ih,
456 item_body(src, item_num), 0);
457 }
458 } else {
459 /*
460 * if ( if item in position item_num in buffer
461 * SOURCE is directory item )
462 */
463 ih = item_head(src, item_num);
464 if (is_direntry_le_ih(ih))
465 leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST,
466 item_num,
467 ih_entry_count(ih) - cpy_bytes,
468 cpy_bytes);
469 else {
470 struct item_head n_ih;
471
472 /*
473 * copy part of the body of the item number 'item_num'
474 * of SOURCE to the begin of the DEST part defined by
475 * 'cpy_bytes'; create new item header;
476 * n_ih = new item_header;
477 */
478 memcpy(&n_ih, ih, SHORT_KEY_SIZE);
479
480 /* Endian safe, both le */
481 n_ih.ih_version = ih->ih_version;
482
483 if (is_direct_le_ih(ih)) {
484 set_le_ih_k_offset(&n_ih,
485 le_ih_k_offset(ih) +
486 ih_item_len(ih) - cpy_bytes);
487 set_le_ih_k_type(&n_ih, TYPE_DIRECT);
488 set_ih_free_space(&n_ih, MAX_US_INT);
489 } else {
490 /* indirect item */
491 RFALSE(!cpy_bytes && get_ih_free_space(ih),
492 "vs-10200: ih->ih_free_space must be 0 when indirect item will be appended");
493 set_le_ih_k_offset(&n_ih,
494 le_ih_k_offset(ih) +
495 (ih_item_len(ih) -
496 cpy_bytes) / UNFM_P_SIZE *
497 dest->b_size);
498 set_le_ih_k_type(&n_ih, TYPE_INDIRECT);
499 set_ih_free_space(&n_ih, get_ih_free_space(ih));
500 }
501
502 /* set item length */
503 put_ih_item_len(&n_ih, cpy_bytes);
504
505 /* Endian safe, both le */
506 n_ih.ih_version = ih->ih_version;
507
508 leaf_insert_into_buf(dest_bi, 0, &n_ih,
509 item_body(src, item_num) +
510 ih_item_len(ih) - cpy_bytes, 0);
511 }
512 }
513 }
514
515 /*
516 * If cpy_bytes equals minus one than copy cpy_num whole items from SOURCE
517 * to DEST. If cpy_bytes not equal to minus one than copy cpy_num-1 whole
518 * items from SOURCE to DEST. From last item copy cpy_num bytes for regular
519 * item and cpy_num directory entries for directory item.
520 */
521 static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src,
522 int last_first, int cpy_num, int cpy_bytes)
523 {
524 struct buffer_head *dest;
525 int pos, i, src_nr_item, bytes;
526
527 dest = dest_bi->bi_bh;
528 RFALSE(!dest || !src, "vs-10210: !dest || !src");
529 RFALSE(last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST,
530 "vs-10220:last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST");
531 RFALSE(B_NR_ITEMS(src) < cpy_num,
532 "vs-10230: No enough items: %d, req. %d", B_NR_ITEMS(src),
533 cpy_num);
534 RFALSE(cpy_num < 0, "vs-10240: cpy_num < 0 (%d)", cpy_num);
535
536 if (cpy_num == 0)
537 return 0;
538
539 if (last_first == FIRST_TO_LAST) {
540 /* copy items to left */
541 pos = 0;
542 if (cpy_num == 1)
543 bytes = cpy_bytes;
544 else
545 bytes = -1;
546
547 /*
548 * copy the first item or it part or nothing to the end of
549 * the DEST (i = leaf_copy_boundary_item(DEST,SOURCE,0,bytes))
550 */
551 i = leaf_copy_boundary_item(dest_bi, src, FIRST_TO_LAST, bytes);
552 cpy_num -= i;
553 if (cpy_num == 0)
554 return i;
555 pos += i;
556 if (cpy_bytes == -1)
557 /*
558 * copy first cpy_num items starting from position
559 * 'pos' of SOURCE to end of DEST
560 */
561 leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST,
562 pos, cpy_num);
563 else {
564 /*
565 * copy first cpy_num-1 items starting from position
566 * 'pos-1' of the SOURCE to the end of the DEST
567 */
568 leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST,
569 pos, cpy_num - 1);
570
571 /*
572 * copy part of the item which number is
573 * cpy_num+pos-1 to the end of the DEST
574 */
575 leaf_item_bottle(dest_bi, src, FIRST_TO_LAST,
576 cpy_num + pos - 1, cpy_bytes);
577 }
578 } else {
579 /* copy items to right */
580 src_nr_item = B_NR_ITEMS(src);
581 if (cpy_num == 1)
582 bytes = cpy_bytes;
583 else
584 bytes = -1;
585
586 /*
587 * copy the last item or it part or nothing to the
588 * begin of the DEST
589 * (i = leaf_copy_boundary_item(DEST,SOURCE,1,bytes));
590 */
591 i = leaf_copy_boundary_item(dest_bi, src, LAST_TO_FIRST, bytes);
592
593 cpy_num -= i;
594 if (cpy_num == 0)
595 return i;
596
597 pos = src_nr_item - cpy_num - i;
598 if (cpy_bytes == -1) {
599 /*
600 * starting from position 'pos' copy last cpy_num
601 * items of SOURCE to begin of DEST
602 */
603 leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST,
604 pos, cpy_num);
605 } else {
606 /*
607 * copy last cpy_num-1 items starting from position
608 * 'pos+1' of the SOURCE to the begin of the DEST;
609 */
610 leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST,
611 pos + 1, cpy_num - 1);
612
613 /*
614 * copy part of the item which number is pos to
615 * the begin of the DEST
616 */
617 leaf_item_bottle(dest_bi, src, LAST_TO_FIRST, pos,
618 cpy_bytes);
619 }
620 }
621 return i;
622 }
623
624 /*
625 * there are types of coping: from S[0] to L[0], from S[0] to R[0],
626 * from R[0] to L[0]. for each of these we have to define parent and
627 * positions of destination and source buffers
628 */
629 static void leaf_define_dest_src_infos(int shift_mode, struct tree_balance *tb,
630 struct buffer_info *dest_bi,
631 struct buffer_info *src_bi,
632 int *first_last,
633 struct buffer_head *Snew)
634 {
635 memset(dest_bi, 0, sizeof(struct buffer_info));
636 memset(src_bi, 0, sizeof(struct buffer_info));
637
638 /* define dest, src, dest parent, dest position */
639 switch (shift_mode) {
640 case LEAF_FROM_S_TO_L: /* it is used in leaf_shift_left */
641 src_bi->tb = tb;
642 src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
643 src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
644
645 /* src->b_item_order */
646 src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
647 dest_bi->tb = tb;
648 dest_bi->bi_bh = tb->L[0];
649 dest_bi->bi_parent = tb->FL[0];
650 dest_bi->bi_position = get_left_neighbor_position(tb, 0);
651 *first_last = FIRST_TO_LAST;
652 break;
653
654 case LEAF_FROM_S_TO_R: /* it is used in leaf_shift_right */
655 src_bi->tb = tb;
656 src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
657 src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
658 src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
659 dest_bi->tb = tb;
660 dest_bi->bi_bh = tb->R[0];
661 dest_bi->bi_parent = tb->FR[0];
662 dest_bi->bi_position = get_right_neighbor_position(tb, 0);
663 *first_last = LAST_TO_FIRST;
664 break;
665
666 case LEAF_FROM_R_TO_L: /* it is used in balance_leaf_when_delete */
667 src_bi->tb = tb;
668 src_bi->bi_bh = tb->R[0];
669 src_bi->bi_parent = tb->FR[0];
670 src_bi->bi_position = get_right_neighbor_position(tb, 0);
671 dest_bi->tb = tb;
672 dest_bi->bi_bh = tb->L[0];
673 dest_bi->bi_parent = tb->FL[0];
674 dest_bi->bi_position = get_left_neighbor_position(tb, 0);
675 *first_last = FIRST_TO_LAST;
676 break;
677
678 case LEAF_FROM_L_TO_R: /* it is used in balance_leaf_when_delete */
679 src_bi->tb = tb;
680 src_bi->bi_bh = tb->L[0];
681 src_bi->bi_parent = tb->FL[0];
682 src_bi->bi_position = get_left_neighbor_position(tb, 0);
683 dest_bi->tb = tb;
684 dest_bi->bi_bh = tb->R[0];
685 dest_bi->bi_parent = tb->FR[0];
686 dest_bi->bi_position = get_right_neighbor_position(tb, 0);
687 *first_last = LAST_TO_FIRST;
688 break;
689
690 case LEAF_FROM_S_TO_SNEW:
691 src_bi->tb = tb;
692 src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
693 src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
694 src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
695 dest_bi->tb = tb;
696 dest_bi->bi_bh = Snew;
697 dest_bi->bi_parent = NULL;
698 dest_bi->bi_position = 0;
699 *first_last = LAST_TO_FIRST;
700 break;
701
702 default:
703 reiserfs_panic(sb_from_bi(src_bi), "vs-10250",
704 "shift type is unknown (%d)", shift_mode);
705 }
706 RFALSE(!src_bi->bi_bh || !dest_bi->bi_bh,
707 "vs-10260: mode==%d, source (%p) or dest (%p) buffer is initialized incorrectly",
708 shift_mode, src_bi->bi_bh, dest_bi->bi_bh);
709 }
710
711 /*
712 * copy mov_num items and mov_bytes of the (mov_num-1)th item to
713 * neighbor. Delete them from source
714 */
715 int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num,
716 int mov_bytes, struct buffer_head *Snew)
717 {
718 int ret_value;
719 struct buffer_info dest_bi, src_bi;
720 int first_last;
721
722 leaf_define_dest_src_infos(shift_mode, tb, &dest_bi, &src_bi,
723 &first_last, Snew);
724
725 ret_value =
726 leaf_copy_items(&dest_bi, src_bi.bi_bh, first_last, mov_num,
727 mov_bytes);
728
729 leaf_delete_items(&src_bi, first_last,
730 (first_last ==
731 FIRST_TO_LAST) ? 0 : (B_NR_ITEMS(src_bi.bi_bh) -
732 mov_num), mov_num, mov_bytes);
733
734 return ret_value;
735 }
736
737 /*
738 * Shift shift_num items (and shift_bytes of last shifted item if
739 * shift_bytes != -1) from S[0] to L[0] and replace the delimiting key
740 */
741 int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes)
742 {
743 struct buffer_head *S0 = PATH_PLAST_BUFFER(tb->tb_path);
744 int i;
745
746 /*
747 * move shift_num (and shift_bytes bytes) items from S[0]
748 * to left neighbor L[0]
749 */
750 i = leaf_move_items(LEAF_FROM_S_TO_L, tb, shift_num, shift_bytes, NULL);
751
752 if (shift_num) {
753 /* number of items in S[0] == 0 */
754 if (B_NR_ITEMS(S0) == 0) {
755
756 RFALSE(shift_bytes != -1,
757 "vs-10270: S0 is empty now, but shift_bytes != -1 (%d)",
758 shift_bytes);
759 #ifdef CONFIG_REISERFS_CHECK
760 if (tb->tb_mode == M_PASTE || tb->tb_mode == M_INSERT) {
761 print_cur_tb("vs-10275");
762 reiserfs_panic(tb->tb_sb, "vs-10275",
763 "balance condition corrupted "
764 "(%c)", tb->tb_mode);
765 }
766 #endif
767
768 if (PATH_H_POSITION(tb->tb_path, 1) == 0)
769 replace_key(tb, tb->CFL[0], tb->lkey[0],
770 PATH_H_PPARENT(tb->tb_path, 0), 0);
771
772 } else {
773 /* replace lkey in CFL[0] by 0-th key from S[0]; */
774 replace_key(tb, tb->CFL[0], tb->lkey[0], S0, 0);
775
776 RFALSE((shift_bytes != -1 &&
777 !(is_direntry_le_ih(item_head(S0, 0))
778 && !ih_entry_count(item_head(S0, 0)))) &&
779 (!op_is_left_mergeable
780 (leaf_key(S0, 0), S0->b_size)),
781 "vs-10280: item must be mergeable");
782 }
783 }
784
785 return i;
786 }
787
788 /* CLEANING STOPPED HERE */
789
790 /*
791 * Shift shift_num (shift_bytes) items from S[0] to the right neighbor,
792 * and replace the delimiting key
793 */
794 int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes)
795 {
796 int ret_value;
797
798 /*
799 * move shift_num (and shift_bytes) items from S[0] to
800 * right neighbor R[0]
801 */
802 ret_value =
803 leaf_move_items(LEAF_FROM_S_TO_R, tb, shift_num, shift_bytes, NULL);
804
805 /* replace rkey in CFR[0] by the 0-th key from R[0] */
806 if (shift_num) {
807 replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
808
809 }
810
811 return ret_value;
812 }
813
814 static void leaf_delete_items_entirely(struct buffer_info *bi,
815 int first, int del_num);
816 /*
817 * If del_bytes == -1, starting from position 'first' delete del_num
818 * items in whole in buffer CUR.
819 * If not.
820 * If last_first == 0. Starting from position 'first' delete del_num-1
821 * items in whole. Delete part of body of the first item. Part defined by
822 * del_bytes. Don't delete first item header
823 * If last_first == 1. Starting from position 'first+1' delete del_num-1
824 * items in whole. Delete part of body of the last item . Part defined by
825 * del_bytes. Don't delete last item header.
826 */
827 void leaf_delete_items(struct buffer_info *cur_bi, int last_first,
828 int first, int del_num, int del_bytes)
829 {
830 struct buffer_head *bh;
831 int item_amount = B_NR_ITEMS(bh = cur_bi->bi_bh);
832
833 RFALSE(!bh, "10155: bh is not defined");
834 RFALSE(del_num < 0, "10160: del_num can not be < 0. del_num==%d",
835 del_num);
836 RFALSE(first < 0
837 || first + del_num > item_amount,
838 "10165: invalid number of first item to be deleted (%d) or "
839 "no so much items (%d) to delete (only %d)", first,
840 first + del_num, item_amount);
841
842 if (del_num == 0)
843 return;
844
845 if (first == 0 && del_num == item_amount && del_bytes == -1) {
846 make_empty_node(cur_bi);
847 do_balance_mark_leaf_dirty(cur_bi->tb, bh, 0);
848 return;
849 }
850
851 if (del_bytes == -1)
852 /* delete del_num items beginning from item in position first */
853 leaf_delete_items_entirely(cur_bi, first, del_num);
854 else {
855 if (last_first == FIRST_TO_LAST) {
856 /*
857 * delete del_num-1 items beginning from
858 * item in position first
859 */
860 leaf_delete_items_entirely(cur_bi, first, del_num - 1);
861
862 /*
863 * delete the part of the first item of the bh
864 * do not delete item header
865 */
866 leaf_cut_from_buffer(cur_bi, 0, 0, del_bytes);
867 } else {
868 struct item_head *ih;
869 int len;
870
871 /*
872 * delete del_num-1 items beginning from
873 * item in position first+1
874 */
875 leaf_delete_items_entirely(cur_bi, first + 1,
876 del_num - 1);
877
878 ih = item_head(bh, B_NR_ITEMS(bh) - 1);
879 if (is_direntry_le_ih(ih))
880 /* the last item is directory */
881 /*
882 * len = numbers of directory entries
883 * in this item
884 */
885 len = ih_entry_count(ih);
886 else
887 /* len = body len of item */
888 len = ih_item_len(ih);
889
890 /*
891 * delete the part of the last item of the bh
892 * do not delete item header
893 */
894 leaf_cut_from_buffer(cur_bi, B_NR_ITEMS(bh) - 1,
895 len - del_bytes, del_bytes);
896 }
897 }
898 }
899
900 /* insert item into the leaf node in position before */
901 void leaf_insert_into_buf(struct buffer_info *bi, int before,
902 struct item_head * const inserted_item_ih,
903 const char * const inserted_item_body,
904 int zeros_number)
905 {
906 struct buffer_head *bh = bi->bi_bh;
907 int nr, free_space;
908 struct block_head *blkh;
909 struct item_head *ih;
910 int i;
911 int last_loc, unmoved_loc;
912 char *to;
913
914 blkh = B_BLK_HEAD(bh);
915 nr = blkh_nr_item(blkh);
916 free_space = blkh_free_space(blkh);
917
918 /* check free space */
919 RFALSE(free_space < ih_item_len(inserted_item_ih) + IH_SIZE,
920 "vs-10170: not enough free space in block %z, new item %h",
921 bh, inserted_item_ih);
922 RFALSE(zeros_number > ih_item_len(inserted_item_ih),
923 "vs-10172: zero number == %d, item length == %d",
924 zeros_number, ih_item_len(inserted_item_ih));
925
926 /* get item new item must be inserted before */
927 ih = item_head(bh, before);
928
929 /* prepare space for the body of new item */
930 last_loc = nr ? ih_location(&ih[nr - before - 1]) : bh->b_size;
931 unmoved_loc = before ? ih_location(ih - 1) : bh->b_size;
932
933 memmove(bh->b_data + last_loc - ih_item_len(inserted_item_ih),
934 bh->b_data + last_loc, unmoved_loc - last_loc);
935
936 to = bh->b_data + unmoved_loc - ih_item_len(inserted_item_ih);
937 memset(to, 0, zeros_number);
938 to += zeros_number;
939
940 /* copy body to prepared space */
941 if (inserted_item_body)
942 memmove(to, inserted_item_body,
943 ih_item_len(inserted_item_ih) - zeros_number);
944 else
945 memset(to, '\0', ih_item_len(inserted_item_ih) - zeros_number);
946
947 /* insert item header */
948 memmove(ih + 1, ih, IH_SIZE * (nr - before));
949 memmove(ih, inserted_item_ih, IH_SIZE);
950
951 /* change locations */
952 for (i = before; i < nr + 1; i++) {
953 unmoved_loc -= ih_item_len(&ih[i - before]);
954 put_ih_location(&ih[i - before], unmoved_loc);
955 }
956
957 /* sizes, free space, item number */
958 set_blkh_nr_item(blkh, blkh_nr_item(blkh) + 1);
959 set_blkh_free_space(blkh,
960 free_space - (IH_SIZE +
961 ih_item_len(inserted_item_ih)));
962 do_balance_mark_leaf_dirty(bi->tb, bh, 1);
963
964 if (bi->bi_parent) {
965 struct disk_child *t_dc;
966 t_dc = B_N_CHILD(bi->bi_parent, bi->bi_position);
967 put_dc_size(t_dc,
968 dc_size(t_dc) + (IH_SIZE +
969 ih_item_len(inserted_item_ih)));
970 do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
971 }
972 }
973
974 /*
975 * paste paste_size bytes to affected_item_num-th item.
976 * When item is a directory, this only prepare space for new entries
977 */
978 void leaf_paste_in_buffer(struct buffer_info *bi, int affected_item_num,
979 int pos_in_item, int paste_size,
980 const char *body, int zeros_number)
981 {
982 struct buffer_head *bh = bi->bi_bh;
983 int nr, free_space;
984 struct block_head *blkh;
985 struct item_head *ih;
986 int i;
987 int last_loc, unmoved_loc;
988
989 blkh = B_BLK_HEAD(bh);
990 nr = blkh_nr_item(blkh);
991 free_space = blkh_free_space(blkh);
992
993 /* check free space */
994 RFALSE(free_space < paste_size,
995 "vs-10175: not enough free space: needed %d, available %d",
996 paste_size, free_space);
997
998 #ifdef CONFIG_REISERFS_CHECK
999 if (zeros_number > paste_size) {
1000 struct super_block *sb = NULL;
1001 if (bi && bi->tb)
1002 sb = bi->tb->tb_sb;
1003 print_cur_tb("10177");
1004 reiserfs_panic(sb, "vs-10177",
1005 "zeros_number == %d, paste_size == %d",
1006 zeros_number, paste_size);
1007 }
1008 #endif /* CONFIG_REISERFS_CHECK */
1009
1010 /* item to be appended */
1011 ih = item_head(bh, affected_item_num);
1012
1013 last_loc = ih_location(&ih[nr - affected_item_num - 1]);
1014 unmoved_loc = affected_item_num ? ih_location(ih - 1) : bh->b_size;
1015
1016 /* prepare space */
1017 memmove(bh->b_data + last_loc - paste_size, bh->b_data + last_loc,
1018 unmoved_loc - last_loc);
1019
1020 /* change locations */
1021 for (i = affected_item_num; i < nr; i++)
1022 put_ih_location(&ih[i - affected_item_num],
1023 ih_location(&ih[i - affected_item_num]) -
1024 paste_size);
1025
1026 if (body) {
1027 if (!is_direntry_le_ih(ih)) {
1028 if (!pos_in_item) {
1029 /* shift data to right */
1030 memmove(bh->b_data + ih_location(ih) +
1031 paste_size,
1032 bh->b_data + ih_location(ih),
1033 ih_item_len(ih));
1034 /* paste data in the head of item */
1035 memset(bh->b_data + ih_location(ih), 0,
1036 zeros_number);
1037 memcpy(bh->b_data + ih_location(ih) +
1038 zeros_number, body,
1039 paste_size - zeros_number);
1040 } else {
1041 memset(bh->b_data + unmoved_loc - paste_size, 0,
1042 zeros_number);
1043 memcpy(bh->b_data + unmoved_loc - paste_size +
1044 zeros_number, body,
1045 paste_size - zeros_number);
1046 }
1047 }
1048 } else
1049 memset(bh->b_data + unmoved_loc - paste_size, '\0', paste_size);
1050
1051 put_ih_item_len(ih, ih_item_len(ih) + paste_size);
1052
1053 /* change free space */
1054 set_blkh_free_space(blkh, free_space - paste_size);
1055
1056 do_balance_mark_leaf_dirty(bi->tb, bh, 0);
1057
1058 if (bi->bi_parent) {
1059 struct disk_child *t_dc =
1060 B_N_CHILD(bi->bi_parent, bi->bi_position);
1061 put_dc_size(t_dc, dc_size(t_dc) + paste_size);
1062 do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
1063 }
1064 }
1065
1066 /*
1067 * cuts DEL_COUNT entries beginning from FROM-th entry. Directory item
1068 * does not have free space, so it moves DEHs and remaining records as
1069 * necessary. Return value is size of removed part of directory item
1070 * in bytes.
1071 */
1072 static int leaf_cut_entries(struct buffer_head *bh,
1073 struct item_head *ih, int from, int del_count)
1074 {
1075 char *item;
1076 struct reiserfs_de_head *deh;
1077 int prev_record_offset; /* offset of record, that is (from-1)th */
1078 char *prev_record; /* */
1079 int cut_records_len; /* length of all removed records */
1080 int i;
1081
1082 /*
1083 * make sure that item is directory and there are enough entries to
1084 * remove
1085 */
1086 RFALSE(!is_direntry_le_ih(ih), "10180: item is not directory item");
1087 RFALSE(ih_entry_count(ih) < from + del_count,
1088 "10185: item contains not enough entries: entry_count = %d, from = %d, to delete = %d",
1089 ih_entry_count(ih), from, del_count);
1090
1091 if (del_count == 0)
1092 return 0;
1093
1094 /* first byte of item */
1095 item = bh->b_data + ih_location(ih);
1096
1097 /* entry head array */
1098 deh = B_I_DEH(bh, ih);
1099
1100 /*
1101 * first byte of remaining entries, those are BEFORE cut entries
1102 * (prev_record) and length of all removed records (cut_records_len)
1103 */
1104 prev_record_offset =
1105 (from ? deh_location(&deh[from - 1]) : ih_item_len(ih));
1106 cut_records_len = prev_record_offset /*from_record */ -
1107 deh_location(&deh[from + del_count - 1]);
1108 prev_record = item + prev_record_offset;
1109
1110 /* adjust locations of remaining entries */
1111 for (i = ih_entry_count(ih) - 1; i > from + del_count - 1; i--)
1112 put_deh_location(&deh[i],
1113 deh_location(&deh[i]) -
1114 (DEH_SIZE * del_count));
1115
1116 for (i = 0; i < from; i++)
1117 put_deh_location(&deh[i],
1118 deh_location(&deh[i]) - (DEH_SIZE * del_count +
1119 cut_records_len));
1120
1121 put_ih_entry_count(ih, ih_entry_count(ih) - del_count);
1122
1123 /* shift entry head array and entries those are AFTER removed entries */
1124 memmove((char *)(deh + from),
1125 deh + from + del_count,
1126 prev_record - cut_records_len - (char *)(deh + from +
1127 del_count));
1128
1129 /* shift records, those are BEFORE removed entries */
1130 memmove(prev_record - cut_records_len - DEH_SIZE * del_count,
1131 prev_record, item + ih_item_len(ih) - prev_record);
1132
1133 return DEH_SIZE * del_count + cut_records_len;
1134 }
1135
1136 /*
1137 * when cut item is part of regular file
1138 * pos_in_item - first byte that must be cut
1139 * cut_size - number of bytes to be cut beginning from pos_in_item
1140 *
1141 * when cut item is part of directory
1142 * pos_in_item - number of first deleted entry
1143 * cut_size - count of deleted entries
1144 */
1145 void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num,
1146 int pos_in_item, int cut_size)
1147 {
1148 int nr;
1149 struct buffer_head *bh = bi->bi_bh;
1150 struct block_head *blkh;
1151 struct item_head *ih;
1152 int last_loc, unmoved_loc;
1153 int i;
1154
1155 blkh = B_BLK_HEAD(bh);
1156 nr = blkh_nr_item(blkh);
1157
1158 /* item head of truncated item */
1159 ih = item_head(bh, cut_item_num);
1160
1161 if (is_direntry_le_ih(ih)) {
1162 /* first cut entry () */
1163 cut_size = leaf_cut_entries(bh, ih, pos_in_item, cut_size);
1164 if (pos_in_item == 0) {
1165 /* change key */
1166 RFALSE(cut_item_num,
1167 "when 0-th enrty of item is cut, that item must be first in the node, not %d-th",
1168 cut_item_num);
1169 /* change item key by key of first entry in the item */
1170 set_le_ih_k_offset(ih, deh_offset(B_I_DEH(bh, ih)));
1171 }
1172 } else {
1173 /* item is direct or indirect */
1174 RFALSE(is_statdata_le_ih(ih), "10195: item is stat data");
1175 RFALSE(pos_in_item && pos_in_item + cut_size != ih_item_len(ih),
1176 "10200: invalid offset (%lu) or trunc_size (%lu) or ih_item_len (%lu)",
1177 (long unsigned)pos_in_item, (long unsigned)cut_size,
1178 (long unsigned)ih_item_len(ih));
1179
1180 /* shift item body to left if cut is from the head of item */
1181 if (pos_in_item == 0) {
1182 memmove(bh->b_data + ih_location(ih),
1183 bh->b_data + ih_location(ih) + cut_size,
1184 ih_item_len(ih) - cut_size);
1185
1186 /* change key of item */
1187 if (is_direct_le_ih(ih))
1188 set_le_ih_k_offset(ih,
1189 le_ih_k_offset(ih) +
1190 cut_size);
1191 else {
1192 set_le_ih_k_offset(ih,
1193 le_ih_k_offset(ih) +
1194 (cut_size / UNFM_P_SIZE) *
1195 bh->b_size);
1196 RFALSE(ih_item_len(ih) == cut_size
1197 && get_ih_free_space(ih),
1198 "10205: invalid ih_free_space (%h)", ih);
1199 }
1200 }
1201 }
1202
1203 /* location of the last item */
1204 last_loc = ih_location(&ih[nr - cut_item_num - 1]);
1205
1206 /* location of the item, which is remaining at the same place */
1207 unmoved_loc = cut_item_num ? ih_location(ih - 1) : bh->b_size;
1208
1209 /* shift */
1210 memmove(bh->b_data + last_loc + cut_size, bh->b_data + last_loc,
1211 unmoved_loc - last_loc - cut_size);
1212
1213 /* change item length */
1214 put_ih_item_len(ih, ih_item_len(ih) - cut_size);
1215
1216 if (is_indirect_le_ih(ih)) {
1217 if (pos_in_item)
1218 set_ih_free_space(ih, 0);
1219 }
1220
1221 /* change locations */
1222 for (i = cut_item_num; i < nr; i++)
1223 put_ih_location(&ih[i - cut_item_num],
1224 ih_location(&ih[i - cut_item_num]) + cut_size);
1225
1226 /* size, free space */
1227 set_blkh_free_space(blkh, blkh_free_space(blkh) + cut_size);
1228
1229 do_balance_mark_leaf_dirty(bi->tb, bh, 0);
1230
1231 if (bi->bi_parent) {
1232 struct disk_child *t_dc;
1233 t_dc = B_N_CHILD(bi->bi_parent, bi->bi_position);
1234 put_dc_size(t_dc, dc_size(t_dc) - cut_size);
1235 do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
1236 }
1237 }
1238
1239 /* delete del_num items from buffer starting from the first'th item */
1240 static void leaf_delete_items_entirely(struct buffer_info *bi,
1241 int first, int del_num)
1242 {
1243 struct buffer_head *bh = bi->bi_bh;
1244 int nr;
1245 int i, j;
1246 int last_loc, last_removed_loc;
1247 struct block_head *blkh;
1248 struct item_head *ih;
1249
1250 RFALSE(bh == NULL, "10210: buffer is 0");
1251 RFALSE(del_num < 0, "10215: del_num less than 0 (%d)", del_num);
1252
1253 if (del_num == 0)
1254 return;
1255
1256 blkh = B_BLK_HEAD(bh);
1257 nr = blkh_nr_item(blkh);
1258
1259 RFALSE(first < 0 || first + del_num > nr,
1260 "10220: first=%d, number=%d, there is %d items", first, del_num,
1261 nr);
1262
1263 if (first == 0 && del_num == nr) {
1264 /* this does not work */
1265 make_empty_node(bi);
1266
1267 do_balance_mark_leaf_dirty(bi->tb, bh, 0);
1268 return;
1269 }
1270
1271 ih = item_head(bh, first);
1272
1273 /* location of unmovable item */
1274 j = (first == 0) ? bh->b_size : ih_location(ih - 1);
1275
1276 /* delete items */
1277 last_loc = ih_location(&ih[nr - 1 - first]);
1278 last_removed_loc = ih_location(&ih[del_num - 1]);
1279
1280 memmove(bh->b_data + last_loc + j - last_removed_loc,
1281 bh->b_data + last_loc, last_removed_loc - last_loc);
1282
1283 /* delete item headers */
1284 memmove(ih, ih + del_num, (nr - first - del_num) * IH_SIZE);
1285
1286 /* change item location */
1287 for (i = first; i < nr - del_num; i++)
1288 put_ih_location(&ih[i - first],
1289 ih_location(&ih[i - first]) + (j -
1290 last_removed_loc));
1291
1292 /* sizes, item number */
1293 set_blkh_nr_item(blkh, blkh_nr_item(blkh) - del_num);
1294 set_blkh_free_space(blkh,
1295 blkh_free_space(blkh) + (j - last_removed_loc +
1296 IH_SIZE * del_num));
1297
1298 do_balance_mark_leaf_dirty(bi->tb, bh, 0);
1299
1300 if (bi->bi_parent) {
1301 struct disk_child *t_dc =
1302 B_N_CHILD(bi->bi_parent, bi->bi_position);
1303 put_dc_size(t_dc,
1304 dc_size(t_dc) - (j - last_removed_loc +
1305 IH_SIZE * del_num));
1306 do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
1307 }
1308 }
1309
1310 /*
1311 * paste new_entry_count entries (new_dehs, records) into position
1312 * before to item_num-th item
1313 */
1314 void leaf_paste_entries(struct buffer_info *bi,
1315 int item_num,
1316 int before,
1317 int new_entry_count,
1318 struct reiserfs_de_head *new_dehs,
1319 const char *records, int paste_size)
1320 {
1321 struct item_head *ih;
1322 char *item;
1323 struct reiserfs_de_head *deh;
1324 char *insert_point;
1325 int i, old_entry_num;
1326 struct buffer_head *bh = bi->bi_bh;
1327
1328 if (new_entry_count == 0)
1329 return;
1330
1331 ih = item_head(bh, item_num);
1332
1333 /*
1334 * make sure, that item is directory, and there are enough
1335 * records in it
1336 */
1337 RFALSE(!is_direntry_le_ih(ih), "10225: item is not directory item");
1338 RFALSE(ih_entry_count(ih) < before,
1339 "10230: there are no entry we paste entries before. entry_count = %d, before = %d",
1340 ih_entry_count(ih), before);
1341
1342 /* first byte of dest item */
1343 item = bh->b_data + ih_location(ih);
1344
1345 /* entry head array */
1346 deh = B_I_DEH(bh, ih);
1347
1348 /* new records will be pasted at this point */
1349 insert_point =
1350 item +
1351 (before ? deh_location(&deh[before - 1])
1352 : (ih_item_len(ih) - paste_size));
1353
1354 /* adjust locations of records that will be AFTER new records */
1355 for (i = ih_entry_count(ih) - 1; i >= before; i--)
1356 put_deh_location(&deh[i],
1357 deh_location(&deh[i]) +
1358 (DEH_SIZE * new_entry_count));
1359
1360 /* adjust locations of records that will be BEFORE new records */
1361 for (i = 0; i < before; i++)
1362 put_deh_location(&deh[i],
1363 deh_location(&deh[i]) + paste_size);
1364
1365 old_entry_num = ih_entry_count(ih);
1366 put_ih_entry_count(ih, ih_entry_count(ih) + new_entry_count);
1367
1368 /* prepare space for pasted records */
1369 memmove(insert_point + paste_size, insert_point,
1370 item + (ih_item_len(ih) - paste_size) - insert_point);
1371
1372 /* copy new records */
1373 memcpy(insert_point + DEH_SIZE * new_entry_count, records,
1374 paste_size - DEH_SIZE * new_entry_count);
1375
1376 /* prepare space for new entry heads */
1377 deh += before;
1378 memmove((char *)(deh + new_entry_count), deh,
1379 insert_point - (char *)deh);
1380
1381 /* copy new entry heads */
1382 deh = (struct reiserfs_de_head *)((char *)deh);
1383 memcpy(deh, new_dehs, DEH_SIZE * new_entry_count);
1384
1385 /* set locations of new records */
1386 for (i = 0; i < new_entry_count; i++) {
1387 put_deh_location(&deh[i],
1388 deh_location(&deh[i]) +
1389 (-deh_location
1390 (&new_dehs[new_entry_count - 1]) +
1391 insert_point + DEH_SIZE * new_entry_count -
1392 item));
1393 }
1394
1395 /* change item key if necessary (when we paste before 0-th entry */
1396 if (!before) {
1397 set_le_ih_k_offset(ih, deh_offset(new_dehs));
1398 }
1399 #ifdef CONFIG_REISERFS_CHECK
1400 {
1401 int prev, next;
1402 /* check record locations */
1403 deh = B_I_DEH(bh, ih);
1404 for (i = 0; i < ih_entry_count(ih); i++) {
1405 next =
1406 (i <
1407 ih_entry_count(ih) -
1408 1) ? deh_location(&deh[i + 1]) : 0;
1409 prev = (i != 0) ? deh_location(&deh[i - 1]) : 0;
1410
1411 if (prev && prev <= deh_location(&deh[i]))
1412 reiserfs_error(sb_from_bi(bi), "vs-10240",
1413 "directory item (%h) "
1414 "corrupted (prev %a, "
1415 "cur(%d) %a)",
1416 ih, deh + i - 1, i, deh + i);
1417 if (next && next >= deh_location(&deh[i]))
1418 reiserfs_error(sb_from_bi(bi), "vs-10250",
1419 "directory item (%h) "
1420 "corrupted (cur(%d) %a, "
1421 "next %a)",
1422 ih, i, deh + i, deh + i + 1);
1423 }
1424 }
1425 #endif
1426
1427 }
Linux with added FPC-III support