git.oblomov.eu Git - linux-2.6/blob - fs/reiserfs/ibalance.c

   1 /*
   2  * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
   3  */
   4
   5 #include <asm/uaccess.h>
   6 #include <linux/string.h>
   7 #include <linux/time.h>
   8 #include <linux/reiserfs_fs.h>
   9 #include <linux/buffer_head.h>
  10
  11 /* this is one and only function that is used outside (do_balance.c) */
  12 int balance_internal(struct tree_balance *,
  13                      int, int, struct item_head *, struct buffer_head **);
  14
  15 /* modes of internal_shift_left, internal_shift_right and internal_insert_childs */
  16 #define INTERNAL_SHIFT_FROM_S_TO_L 0
  17 #define INTERNAL_SHIFT_FROM_R_TO_S 1
  18 #define INTERNAL_SHIFT_FROM_L_TO_S 2
  19 #define INTERNAL_SHIFT_FROM_S_TO_R 3
  20 #define INTERNAL_INSERT_TO_S 4
  21 #define INTERNAL_INSERT_TO_L 5
  22 #define INTERNAL_INSERT_TO_R 6
  23
  24 static void internal_define_dest_src_infos(int shift_mode,
  25                                            struct tree_balance *tb,
  26                                            int h,
  27                                            struct buffer_info *dest_bi,
  28                                            struct buffer_info *src_bi,
  29                                            int *d_key, struct buffer_head **cf)
  30 {
  31         memset(dest_bi, 0, sizeof(struct buffer_info));
  32         memset(src_bi, 0, sizeof(struct buffer_info));
  33         /* define dest, src, dest parent, dest position */
  34         switch (shift_mode) {
  35         case INTERNAL_SHIFT_FROM_S_TO_L:        /* used in internal_shift_left */
  36                 src_bi->tb = tb;
  37                 src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  38                 src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  39                 src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  40                 dest_bi->tb = tb;
  41                 dest_bi->bi_bh = tb->L[h];
  42                 dest_bi->bi_parent = tb->FL[h];
  43                 dest_bi->bi_position = get_left_neighbor_position(tb, h);
  44                 *d_key = tb->lkey[h];
  45                 *cf = tb->CFL[h];
  46                 break;
  47         case INTERNAL_SHIFT_FROM_L_TO_S:
  48                 src_bi->tb = tb;
  49                 src_bi->bi_bh = tb->L[h];
  50                 src_bi->bi_parent = tb->FL[h];
  51                 src_bi->bi_position = get_left_neighbor_position(tb, h);
  52                 dest_bi->tb = tb;
  53                 dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  54                 dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  55                 dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);     /* dest position is analog of dest->b_item_order */
  56                 *d_key = tb->lkey[h];
  57                 *cf = tb->CFL[h];
  58                 break;
  59
  60         case INTERNAL_SHIFT_FROM_R_TO_S:        /* used in internal_shift_left */
  61                 src_bi->tb = tb;
  62                 src_bi->bi_bh = tb->R[h];
  63                 src_bi->bi_parent = tb->FR[h];
  64                 src_bi->bi_position = get_right_neighbor_position(tb, h);
  65                 dest_bi->tb = tb;
  66                 dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  67                 dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  68                 dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  69                 *d_key = tb->rkey[h];
  70                 *cf = tb->CFR[h];
  71                 break;
  72
  73         case INTERNAL_SHIFT_FROM_S_TO_R:
  74                 src_bi->tb = tb;
  75                 src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  76                 src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  77                 src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  78                 dest_bi->tb = tb;
  79                 dest_bi->bi_bh = tb->R[h];
  80                 dest_bi->bi_parent = tb->FR[h];
  81                 dest_bi->bi_position = get_right_neighbor_position(tb, h);
  82                 *d_key = tb->rkey[h];
  83                 *cf = tb->CFR[h];
  84                 break;
  85
  86         case INTERNAL_INSERT_TO_L:
  87                 dest_bi->tb = tb;
  88                 dest_bi->bi_bh = tb->L[h];
  89                 dest_bi->bi_parent = tb->FL[h];
  90                 dest_bi->bi_position = get_left_neighbor_position(tb, h);
  91                 break;
  92
  93         case INTERNAL_INSERT_TO_S:
  94                 dest_bi->tb = tb;
  95                 dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  96                 dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  97                 dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  98                 break;
  99
 100         case INTERNAL_INSERT_TO_R:
 101                 dest_bi->tb = tb;
 102                 dest_bi->bi_bh = tb->R[h];
 103                 dest_bi->bi_parent = tb->FR[h];
 104                 dest_bi->bi_position = get_right_neighbor_position(tb, h);
 105                 break;
 106
 107         default:
 108                 reiserfs_panic(tb->tb_sb, "ibalance-1",
 109                                "shift type is unknown (%d)",
 110                                shift_mode);
 111         }
 112 }
 113
 114 /* Insert count node pointers into buffer cur before position to + 1.
 115  * Insert count items into buffer cur before position to.
 116  * Items and node pointers are specified by inserted and bh respectively.
 117  */
 118 static void internal_insert_childs(struct buffer_info *cur_bi,
 119                                    int to, int count,
 120                                    struct item_head *inserted,
 121                                    struct buffer_head **bh)
 122 {
 123         struct buffer_head *cur = cur_bi->bi_bh;
 124         struct block_head *blkh;
 125         int nr;
 126         struct reiserfs_key *ih;
 127         struct disk_child new_dc[2];
 128         struct disk_child *dc;
 129         int i;
 130
 131         if (count <= 0)
 132                 return;
 133
 134         blkh = B_BLK_HEAD(cur);
 135         nr = blkh_nr_item(blkh);
 136
 137         RFALSE(count > 2, "too many children (%d) are to be inserted", count);
 138         RFALSE(B_FREE_SPACE(cur) < count * (KEY_SIZE + DC_SIZE),
 139                "no enough free space (%d), needed %d bytes",
 140                B_FREE_SPACE(cur), count * (KEY_SIZE + DC_SIZE));
 141
 142         /* prepare space for count disk_child */
 143         dc = B_N_CHILD(cur, to + 1);
 144
 145         memmove(dc + count, dc, (nr + 1 - (to + 1)) * DC_SIZE);
 146
 147         /* copy to_be_insert disk children */
 148         for (i = 0; i < count; i++) {
 149                 put_dc_size(&(new_dc[i]),
 150                             MAX_CHILD_SIZE(bh[i]) - B_FREE_SPACE(bh[i]));
 151                 put_dc_block_number(&(new_dc[i]), bh[i]->b_blocknr);
 152         }
 153         memcpy(dc, new_dc, DC_SIZE * count);
 154
 155         /* prepare space for count items  */
 156         ih = B_N_PDELIM_KEY(cur, ((to == -1) ? 0 : to));
 157
 158         memmove(ih + count, ih,
 159                 (nr - to) * KEY_SIZE + (nr + 1 + count) * DC_SIZE);
 160
 161         /* copy item headers (keys) */
 162         memcpy(ih, inserted, KEY_SIZE);
 163         if (count > 1)
 164                 memcpy(ih + 1, inserted + 1, KEY_SIZE);
 165
 166         /* sizes, item number */
 167         set_blkh_nr_item(blkh, blkh_nr_item(blkh) + count);
 168         set_blkh_free_space(blkh,
 169                             blkh_free_space(blkh) - count * (DC_SIZE +
 170                                                              KEY_SIZE));
 171
 172         do_balance_mark_internal_dirty(cur_bi->tb, cur, 0);
 173
 174         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 175         check_internal(cur);
 176         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 177
 178         if (cur_bi->bi_parent) {
 179                 struct disk_child *t_dc =
 180                     B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position);
 181                 put_dc_size(t_dc,
 182                             dc_size(t_dc) + (count * (DC_SIZE + KEY_SIZE)));
 183                 do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent,
 184                                                0);
 185
 186                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 187                 check_internal(cur_bi->bi_parent);
 188                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 189         }
 190
 191 }
 192
 193 /* Delete del_num items and node pointers from buffer cur starting from *
 194  * the first_i'th item and first_p'th pointers respectively.            */
 195 static void internal_delete_pointers_items(struct buffer_info *cur_bi,
 196                                            int first_p,
 197                                            int first_i, int del_num)
 198 {
 199         struct buffer_head *cur = cur_bi->bi_bh;
 200         int nr;
 201         struct block_head *blkh;
 202         struct reiserfs_key *key;
 203         struct disk_child *dc;
 204
 205         RFALSE(cur == NULL, "buffer is 0");
 206         RFALSE(del_num < 0,
 207                "negative number of items (%d) can not be deleted", del_num);
 208         RFALSE(first_p < 0 || first_p + del_num > B_NR_ITEMS(cur) + 1
 209                || first_i < 0,
 210                "first pointer order (%d) < 0 or "
 211                "no so many pointers (%d), only (%d) or "
 212                "first key order %d < 0", first_p, first_p + del_num,
 213                B_NR_ITEMS(cur) + 1, first_i);
 214         if (del_num == 0)
 215                 return;
 216
 217         blkh = B_BLK_HEAD(cur);
 218         nr = blkh_nr_item(blkh);
 219
 220         if (first_p == 0 && del_num == nr + 1) {
 221                 RFALSE(first_i != 0,
 222                        "1st deleted key must have order 0, not %d", first_i);
 223                 make_empty_node(cur_bi);
 224                 return;
 225         }
 226
 227         RFALSE(first_i + del_num > B_NR_ITEMS(cur),
 228                "first_i = %d del_num = %d "
 229                "no so many keys (%d) in the node (%b)(%z)",
 230                first_i, del_num, first_i + del_num, cur, cur);
 231
 232         /* deleting */
 233         dc = B_N_CHILD(cur, first_p);
 234
 235         memmove(dc, dc + del_num, (nr + 1 - first_p - del_num) * DC_SIZE);
 236         key = B_N_PDELIM_KEY(cur, first_i);
 237         memmove(key, key + del_num,
 238                 (nr - first_i - del_num) * KEY_SIZE + (nr + 1 -
 239                                                        del_num) * DC_SIZE);
 240
 241         /* sizes, item number */
 242         set_blkh_nr_item(blkh, blkh_nr_item(blkh) - del_num);
 243         set_blkh_free_space(blkh,
 244                             blkh_free_space(blkh) +
 245                             (del_num * (KEY_SIZE + DC_SIZE)));
 246
 247         do_balance_mark_internal_dirty(cur_bi->tb, cur, 0);
 248         /*&&&&&&&&&&&&&&&&&&&&&&& */
 249         check_internal(cur);
 250         /*&&&&&&&&&&&&&&&&&&&&&&& */
 251
 252         if (cur_bi->bi_parent) {
 253                 struct disk_child *t_dc;
 254                 t_dc = B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position);
 255                 put_dc_size(t_dc,
 256                             dc_size(t_dc) - (del_num * (KEY_SIZE + DC_SIZE)));
 257
 258                 do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent,
 259                                                0);
 260                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 261                 check_internal(cur_bi->bi_parent);
 262                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 263         }
 264 }
 265
 266 /* delete n node pointers and items starting from given position */
 267 static void internal_delete_childs(struct buffer_info *cur_bi, int from, int n)
 268 {
 269         int i_from;
 270
 271         i_from = (from == 0) ? from : from - 1;
 272
 273         /* delete n pointers starting from `from' position in CUR;
 274            delete n keys starting from 'i_from' position in CUR;
 275          */
 276         internal_delete_pointers_items(cur_bi, from, i_from, n);
 277 }
 278
 279 /* copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest
 280 * last_first == FIRST_TO_LAST means, that we copy first items from src to tail of dest
 281  * last_first == LAST_TO_FIRST means, that we copy last items from src to head of dest
 282  */
 283 static void internal_copy_pointers_items(struct buffer_info *dest_bi,
 284                                          struct buffer_head *src,
 285                                          int last_first, int cpy_num)
 286 {
 287         /* ATTENTION! Number of node pointers in DEST is equal to number of items in DEST *
 288          * as delimiting key have already inserted to buffer dest.*/
 289         struct buffer_head *dest = dest_bi->bi_bh;
 290         int nr_dest, nr_src;
 291         int dest_order, src_order;
 292         struct block_head *blkh;
 293         struct reiserfs_key *key;
 294         struct disk_child *dc;
 295
 296         nr_src = B_NR_ITEMS(src);
 297
 298         RFALSE(dest == NULL || src == NULL,
 299                "src (%p) or dest (%p) buffer is 0", src, dest);
 300         RFALSE(last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST,
 301                "invalid last_first parameter (%d)", last_first);
 302         RFALSE(nr_src < cpy_num - 1,
 303                "no so many items (%d) in src (%d)", cpy_num, nr_src);
 304         RFALSE(cpy_num < 0, "cpy_num less than 0 (%d)", cpy_num);
 305         RFALSE(cpy_num - 1 + B_NR_ITEMS(dest) > (int)MAX_NR_KEY(dest),
 306                "cpy_num (%d) + item number in dest (%d) can not be > MAX_NR_KEY(%d)",
 307                cpy_num, B_NR_ITEMS(dest), MAX_NR_KEY(dest));
 308
 309         if (cpy_num == 0)
 310                 return;
 311
 312         /* coping */
 313         blkh = B_BLK_HEAD(dest);
 314         nr_dest = blkh_nr_item(blkh);
 315
 316         /*dest_order = (last_first == LAST_TO_FIRST) ? 0 : nr_dest; */
 317         /*src_order = (last_first == LAST_TO_FIRST) ? (nr_src - cpy_num + 1) : 0; */
 318         (last_first == LAST_TO_FIRST) ? (dest_order = 0, src_order =
 319                                          nr_src - cpy_num + 1) : (dest_order =
 320                                                                   nr_dest,
 321                                                                   src_order =
 322                                                                   0);
 323
 324         /* prepare space for cpy_num pointers */
 325         dc = B_N_CHILD(dest, dest_order);
 326
 327         memmove(dc + cpy_num, dc, (nr_dest - dest_order) * DC_SIZE);
 328
 329         /* insert pointers */
 330         memcpy(dc, B_N_CHILD(src, src_order), DC_SIZE * cpy_num);
 331
 332         /* prepare space for cpy_num - 1 item headers */
 333         key = B_N_PDELIM_KEY(dest, dest_order);
 334         memmove(key + cpy_num - 1, key,
 335                 KEY_SIZE * (nr_dest - dest_order) + DC_SIZE * (nr_dest +
 336                                                                cpy_num));
 337
 338         /* insert headers */
 339         memcpy(key, B_N_PDELIM_KEY(src, src_order), KEY_SIZE * (cpy_num - 1));
 340
 341         /* sizes, item number */
 342         set_blkh_nr_item(blkh, blkh_nr_item(blkh) + (cpy_num - 1));
 343         set_blkh_free_space(blkh,
 344                             blkh_free_space(blkh) - (KEY_SIZE * (cpy_num - 1) +
 345                                                      DC_SIZE * cpy_num));
 346
 347         do_balance_mark_internal_dirty(dest_bi->tb, dest, 0);
 348
 349         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 350         check_internal(dest);
 351         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 352
 353         if (dest_bi->bi_parent) {
 354                 struct disk_child *t_dc;
 355                 t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
 356                 put_dc_size(t_dc,
 357                             dc_size(t_dc) + (KEY_SIZE * (cpy_num - 1) +
 358                                              DC_SIZE * cpy_num));
 359
 360                 do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
 361                                                0);
 362                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 363                 check_internal(dest_bi->bi_parent);
 364                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 365         }
 366
 367 }
 368
 369 /* Copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest.
 370  * Delete cpy_num - del_par items and node pointers from buffer src.
 371  * last_first == FIRST_TO_LAST means, that we copy/delete first items from src.
 372  * last_first == LAST_TO_FIRST means, that we copy/delete last items from src.
 373  */
 374 static void internal_move_pointers_items(struct buffer_info *dest_bi,
 375                                          struct buffer_info *src_bi,
 376                                          int last_first, int cpy_num,
 377                                          int del_par)
 378 {
 379         int first_pointer;
 380         int first_item;
 381
 382         internal_copy_pointers_items(dest_bi, src_bi->bi_bh, last_first,
 383                                      cpy_num);
 384
 385         if (last_first == FIRST_TO_LAST) {      /* shift_left occurs */
 386                 first_pointer = 0;
 387                 first_item = 0;
 388                 /* delete cpy_num - del_par pointers and keys starting for pointers with first_pointer,
 389                    for key - with first_item */
 390                 internal_delete_pointers_items(src_bi, first_pointer,
 391                                                first_item, cpy_num - del_par);
 392         } else {                /* shift_right occurs */
 393                 int i, j;
 394
 395                 i = (cpy_num - del_par ==
 396                      (j =
 397                       B_NR_ITEMS(src_bi->bi_bh)) + 1) ? 0 : j - cpy_num +
 398                     del_par;
 399
 400                 internal_delete_pointers_items(src_bi,
 401                                                j + 1 - cpy_num + del_par, i,
 402                                                cpy_num - del_par);
 403         }
 404 }
 405
 406 /* Insert n_src'th key of buffer src before n_dest'th key of buffer dest. */
 407 static void internal_insert_key(struct buffer_info *dest_bi, int dest_position_before,  /* insert key before key with n_dest number */
 408                                 struct buffer_head *src, int src_position)
 409 {
 410         struct buffer_head *dest = dest_bi->bi_bh;
 411         int nr;
 412         struct block_head *blkh;
 413         struct reiserfs_key *key;
 414
 415         RFALSE(dest == NULL || src == NULL,
 416                "source(%p) or dest(%p) buffer is 0", src, dest);
 417         RFALSE(dest_position_before < 0 || src_position < 0,
 418                "source(%d) or dest(%d) key number less than 0",
 419                src_position, dest_position_before);
 420         RFALSE(dest_position_before > B_NR_ITEMS(dest) ||
 421                src_position >= B_NR_ITEMS(src),
 422                "invalid position in dest (%d (key number %d)) or in src (%d (key number %d))",
 423                dest_position_before, B_NR_ITEMS(dest),
 424                src_position, B_NR_ITEMS(src));
 425         RFALSE(B_FREE_SPACE(dest) < KEY_SIZE,
 426                "no enough free space (%d) in dest buffer", B_FREE_SPACE(dest));
 427
 428         blkh = B_BLK_HEAD(dest);
 429         nr = blkh_nr_item(blkh);
 430
 431         /* prepare space for inserting key */
 432         key = B_N_PDELIM_KEY(dest, dest_position_before);
 433         memmove(key + 1, key,
 434                 (nr - dest_position_before) * KEY_SIZE + (nr + 1) * DC_SIZE);
 435
 436         /* insert key */
 437         memcpy(key, B_N_PDELIM_KEY(src, src_position), KEY_SIZE);
 438
 439         /* Change dirt, free space, item number fields. */
 440
 441         set_blkh_nr_item(blkh, blkh_nr_item(blkh) + 1);
 442         set_blkh_free_space(blkh, blkh_free_space(blkh) - KEY_SIZE);
 443
 444         do_balance_mark_internal_dirty(dest_bi->tb, dest, 0);
 445
 446         if (dest_bi->bi_parent) {
 447                 struct disk_child *t_dc;
 448                 t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
 449                 put_dc_size(t_dc, dc_size(t_dc) + KEY_SIZE);
 450
 451                 do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
 452                                                0);
 453         }
 454 }
 455
 456 /* Insert d_key'th (delimiting) key from buffer cfl to tail of dest.
 457  * Copy pointer_amount node pointers and pointer_amount - 1 items from buffer src to buffer dest.
 458  * Replace  d_key'th key in buffer cfl.
 459  * Delete pointer_amount items and node pointers from buffer src.
 460  */
 461 /* this can be invoked both to shift from S to L and from R to S */
 462 static void internal_shift_left(int mode,       /* INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S */
 463                                 struct tree_balance *tb,
 464                                 int h, int pointer_amount)
 465 {
 466         struct buffer_info dest_bi, src_bi;
 467         struct buffer_head *cf;
 468         int d_key_position;
 469
 470         internal_define_dest_src_infos(mode, tb, h, &dest_bi, &src_bi,
 471                                        &d_key_position, &cf);
 472
 473         /*printk("pointer_amount = %d\n",pointer_amount); */
 474
 475         if (pointer_amount) {
 476                 /* insert delimiting key from common father of dest and src to node dest into position B_NR_ITEM(dest) */
 477                 internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf,
 478                                     d_key_position);
 479
 480                 if (B_NR_ITEMS(src_bi.bi_bh) == pointer_amount - 1) {
 481                         if (src_bi.bi_position /*src->b_item_order */  == 0)
 482                                 replace_key(tb, cf, d_key_position,
 483                                             src_bi.
 484                                             bi_parent /*src->b_parent */ , 0);
 485                 } else
 486                         replace_key(tb, cf, d_key_position, src_bi.bi_bh,
 487                                     pointer_amount - 1);
 488         }
 489         /* last parameter is del_parameter */
 490         internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST,
 491                                      pointer_amount, 0);
 492
 493 }
 494
 495 /* Insert delimiting key to L[h].
 496  * Copy n node pointers and n - 1 items from buffer S[h] to L[h].
 497  * Delete n - 1 items and node pointers from buffer S[h].
 498  */
 499 /* it always shifts from S[h] to L[h] */
 500 static void internal_shift1_left(struct tree_balance *tb,
 501                                  int h, int pointer_amount)
 502 {
 503         struct buffer_info dest_bi, src_bi;
 504         struct buffer_head *cf;
 505         int d_key_position;
 506
 507         internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
 508                                        &dest_bi, &src_bi, &d_key_position, &cf);
 509
 510         if (pointer_amount > 0) /* insert lkey[h]-th key  from CFL[h] to left neighbor L[h] */
 511                 internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf,
 512                                     d_key_position);
 513         /*            internal_insert_key (tb->L[h], B_NR_ITEM(tb->L[h]), tb->CFL[h], tb->lkey[h]); */
 514
 515         /* last parameter is del_parameter */
 516         internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST,
 517                                      pointer_amount, 1);
 518         /*    internal_move_pointers_items (tb->L[h], tb->S[h], FIRST_TO_LAST, pointer_amount, 1); */
 519 }
 520
 521 /* Insert d_key'th (delimiting) key from buffer cfr to head of dest.
 522  * Copy n node pointers and n - 1 items from buffer src to buffer dest.
 523  * Replace  d_key'th key in buffer cfr.
 524  * Delete n items and node pointers from buffer src.
 525  */
 526 static void internal_shift_right(int mode,      /* INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S */
 527                                  struct tree_balance *tb,
 528                                  int h, int pointer_amount)
 529 {
 530         struct buffer_info dest_bi, src_bi;
 531         struct buffer_head *cf;
 532         int d_key_position;
 533         int nr;
 534
 535         internal_define_dest_src_infos(mode, tb, h, &dest_bi, &src_bi,
 536                                        &d_key_position, &cf);
 537
 538         nr = B_NR_ITEMS(src_bi.bi_bh);
 539
 540         if (pointer_amount > 0) {
 541                 /* insert delimiting key from common father of dest and src to dest node into position 0 */
 542                 internal_insert_key(&dest_bi, 0, cf, d_key_position);
 543                 if (nr == pointer_amount - 1) {
 544                         RFALSE(src_bi.bi_bh != PATH_H_PBUFFER(tb->tb_path, h) /*tb->S[h] */ ||
 545                                dest_bi.bi_bh != tb->R[h],
 546                                "src (%p) must be == tb->S[h](%p) when it disappears",
 547                                src_bi.bi_bh, PATH_H_PBUFFER(tb->tb_path, h));
 548                         /* when S[h] disappers replace left delemiting key as well */
 549                         if (tb->CFL[h])
 550                                 replace_key(tb, cf, d_key_position, tb->CFL[h],
 551                                             tb->lkey[h]);
 552                 } else
 553                         replace_key(tb, cf, d_key_position, src_bi.bi_bh,
 554                                     nr - pointer_amount);
 555         }
 556
 557         /* last parameter is del_parameter */
 558         internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST,
 559                                      pointer_amount, 0);
 560 }
 561
 562 /* Insert delimiting key to R[h].
 563  * Copy n node pointers and n - 1 items from buffer S[h] to R[h].
 564  * Delete n - 1 items and node pointers from buffer S[h].
 565  */
 566 /* it always shift from S[h] to R[h] */
 567 static void internal_shift1_right(struct tree_balance *tb,
 568                                   int h, int pointer_amount)
 569 {
 570         struct buffer_info dest_bi, src_bi;
 571         struct buffer_head *cf;
 572         int d_key_position;
 573
 574         internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 575                                        &dest_bi, &src_bi, &d_key_position, &cf);
 576
 577         if (pointer_amount > 0) /* insert rkey from CFR[h] to right neighbor R[h] */
 578                 internal_insert_key(&dest_bi, 0, cf, d_key_position);
 579         /*            internal_insert_key (tb->R[h], 0, tb->CFR[h], tb->rkey[h]); */
 580
 581         /* last parameter is del_parameter */
 582         internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST,
 583                                      pointer_amount, 1);
 584         /*    internal_move_pointers_items (tb->R[h], tb->S[h], LAST_TO_FIRST, pointer_amount, 1); */
 585 }
 586
 587 /* Delete insert_num node pointers together with their left items
 588  * and balance current node.*/
 589 static void balance_internal_when_delete(struct tree_balance *tb,
 590                                          int h, int child_pos)
 591 {
 592         int insert_num;
 593         int n;
 594         struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h);
 595         struct buffer_info bi;
 596
 597         insert_num = tb->insert_size[h] / ((int)(DC_SIZE + KEY_SIZE));
 598
 599         /* delete child-node-pointer(s) together with their left item(s) */
 600         bi.tb = tb;
 601         bi.bi_bh = tbSh;
 602         bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
 603         bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
 604
 605         internal_delete_childs(&bi, child_pos, -insert_num);
 606
 607         RFALSE(tb->blknum[h] > 1,
 608                "tb->blknum[%d]=%d when insert_size < 0", h, tb->blknum[h]);
 609
 610         n = B_NR_ITEMS(tbSh);
 611
 612         if (tb->lnum[h] == 0 && tb->rnum[h] == 0) {
 613                 if (tb->blknum[h] == 0) {
 614                         /* node S[h] (root of the tree) is empty now */
 615                         struct buffer_head *new_root;
 616
 617                         RFALSE(n
 618                                || B_FREE_SPACE(tbSh) !=
 619                                MAX_CHILD_SIZE(tbSh) - DC_SIZE,
 620                                "buffer must have only 0 keys (%d)", n);
 621                         RFALSE(bi.bi_parent, "root has parent (%p)",
 622                                bi.bi_parent);
 623
 624                         /* choose a new root */
 625                         if (!tb->L[h - 1] || !B_NR_ITEMS(tb->L[h - 1]))
 626                                 new_root = tb->R[h - 1];
 627                         else
 628                                 new_root = tb->L[h - 1];
 629                         /* switch super block's tree root block number to the new value */
 630                         PUT_SB_ROOT_BLOCK(tb->tb_sb, new_root->b_blocknr);
 631                         //REISERFS_SB(tb->tb_sb)->s_rs->s_tree_height --;
 632                         PUT_SB_TREE_HEIGHT(tb->tb_sb,
 633                                            SB_TREE_HEIGHT(tb->tb_sb) - 1);
 634
 635                         do_balance_mark_sb_dirty(tb,
 636                                                  REISERFS_SB(tb->tb_sb)->s_sbh,
 637                                                  1);
 638                         /*&&&&&&&&&&&&&&&&&&&&&& */
 639                         if (h > 1)
 640                                 /* use check_internal if new root is an internal node */
 641                                 check_internal(new_root);
 642                         /*&&&&&&&&&&&&&&&&&&&&&& */
 643
 644                         /* do what is needed for buffer thrown from tree */
 645                         reiserfs_invalidate_buffer(tb, tbSh);
 646                         return;
 647                 }
 648                 return;
 649         }
 650
 651         if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) {     /* join S[h] with L[h] */
 652
 653                 RFALSE(tb->rnum[h] != 0,
 654                        "invalid tb->rnum[%d]==%d when joining S[h] with L[h]",
 655                        h, tb->rnum[h]);
 656
 657                 internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, n + 1);
 658                 reiserfs_invalidate_buffer(tb, tbSh);
 659
 660                 return;
 661         }
 662
 663         if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) {     /* join S[h] with R[h] */
 664                 RFALSE(tb->lnum[h] != 0,
 665                        "invalid tb->lnum[%d]==%d when joining S[h] with R[h]",
 666                        h, tb->lnum[h]);
 667
 668                 internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, n + 1);
 669
 670                 reiserfs_invalidate_buffer(tb, tbSh);
 671                 return;
 672         }
 673
 674         if (tb->lnum[h] < 0) {  /* borrow from left neighbor L[h] */
 675                 RFALSE(tb->rnum[h] != 0,
 676                        "wrong tb->rnum[%d]==%d when borrow from L[h]", h,
 677                        tb->rnum[h]);
 678                 /*internal_shift_right (tb, h, tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], -tb->lnum[h]); */
 679                 internal_shift_right(INTERNAL_SHIFT_FROM_L_TO_S, tb, h,
 680                                      -tb->lnum[h]);
 681                 return;
 682         }
 683
 684         if (tb->rnum[h] < 0) {  /* borrow from right neighbor R[h] */
 685                 RFALSE(tb->lnum[h] != 0,
 686                        "invalid tb->lnum[%d]==%d when borrow from R[h]",
 687                        h, tb->lnum[h]);
 688                 internal_shift_left(INTERNAL_SHIFT_FROM_R_TO_S, tb, h, -tb->rnum[h]);   /*tb->S[h], tb->CFR[h], tb->rkey[h], tb->R[h], -tb->rnum[h]); */
 689                 return;
 690         }
 691
 692         if (tb->lnum[h] > 0) {  /* split S[h] into two parts and put them into neighbors */
 693                 RFALSE(tb->rnum[h] == 0 || tb->lnum[h] + tb->rnum[h] != n + 1,
 694                        "invalid tb->lnum[%d]==%d or tb->rnum[%d]==%d when S[h](item number == %d) is split between them",
 695                        h, tb->lnum[h], h, tb->rnum[h], n);
 696
 697                 internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, tb->lnum[h]);    /*tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], tb->lnum[h]); */
 698                 internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 699                                      tb->rnum[h]);
 700
 701                 reiserfs_invalidate_buffer(tb, tbSh);
 702
 703                 return;
 704         }
 705         reiserfs_panic(tb->tb_sb, "ibalance-2",
 706                        "unexpected tb->lnum[%d]==%d or tb->rnum[%d]==%d",
 707                        h, tb->lnum[h], h, tb->rnum[h]);
 708 }
 709
 710 /* Replace delimiting key of buffers L[h] and S[h] by the given key.*/
 711 static void replace_lkey(struct tree_balance *tb, int h, struct item_head *key)
 712 {
 713         RFALSE(tb->L[h] == NULL || tb->CFL[h] == NULL,
 714                "L[h](%p) and CFL[h](%p) must exist in replace_lkey",
 715                tb->L[h], tb->CFL[h]);
 716
 717         if (B_NR_ITEMS(PATH_H_PBUFFER(tb->tb_path, h)) == 0)
 718                 return;
 719
 720         memcpy(B_N_PDELIM_KEY(tb->CFL[h], tb->lkey[h]), key, KEY_SIZE);
 721
 722         do_balance_mark_internal_dirty(tb, tb->CFL[h], 0);
 723 }
 724
 725 /* Replace delimiting key of buffers S[h] and R[h] by the given key.*/
 726 static void replace_rkey(struct tree_balance *tb, int h, struct item_head *key)
 727 {
 728         RFALSE(tb->R[h] == NULL || tb->CFR[h] == NULL,
 729                "R[h](%p) and CFR[h](%p) must exist in replace_rkey",
 730                tb->R[h], tb->CFR[h]);
 731         RFALSE(B_NR_ITEMS(tb->R[h]) == 0,
 732                "R[h] can not be empty if it exists (item number=%d)",
 733                B_NR_ITEMS(tb->R[h]));
 734
 735         memcpy(B_N_PDELIM_KEY(tb->CFR[h], tb->rkey[h]), key, KEY_SIZE);
 736
 737         do_balance_mark_internal_dirty(tb, tb->CFR[h], 0);
 738 }
 739
 740 int balance_internal(struct tree_balance *tb,   /* tree_balance structure               */
 741                      int h,     /* level of the tree                    */
 742                      int child_pos, struct item_head *insert_key,       /* key for insertion on higher level    */
 743                      struct buffer_head **insert_ptr    /* node for insertion on higher level */
 744     )
 745     /* if inserting/pasting
 746        {
 747        child_pos is the position of the node-pointer in S[h] that        *
 748        pointed to S[h-1] before balancing of the h-1 level;              *
 749        this means that new pointers and items must be inserted AFTER *
 750        child_pos
 751        }
 752        else
 753        {
 754        it is the position of the leftmost pointer that must be deleted (together with
 755        its corresponding key to the left of the pointer)
 756        as a result of the previous level's balancing.
 757        }
 758      */
 759 {
 760         struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h);
 761         struct buffer_info bi;
 762         int order;              /* we return this: it is 0 if there is no S[h], else it is tb->S[h]->b_item_order */
 763         int insert_num, n, k;
 764         struct buffer_head *S_new;
 765         struct item_head new_insert_key;
 766         struct buffer_head *new_insert_ptr = NULL;
 767         struct item_head *new_insert_key_addr = insert_key;
 768
 769         RFALSE(h < 1, "h (%d) can not be < 1 on internal level", h);
 770
 771         PROC_INFO_INC(tb->tb_sb, balance_at[h]);
 772
 773         order =
 774             (tbSh) ? PATH_H_POSITION(tb->tb_path,
 775                                      h + 1) /*tb->S[h]->b_item_order */ : 0;
 776
 777         /* Using insert_size[h] calculate the number insert_num of items
 778            that must be inserted to or deleted from S[h]. */
 779         insert_num = tb->insert_size[h] / ((int)(KEY_SIZE + DC_SIZE));
 780
 781         /* Check whether insert_num is proper * */
 782         RFALSE(insert_num < -2 || insert_num > 2,
 783                "incorrect number of items inserted to the internal node (%d)",
 784                insert_num);
 785         RFALSE(h > 1 && (insert_num > 1 || insert_num < -1),
 786                "incorrect number of items (%d) inserted to the internal node on a level (h=%d) higher than last internal level",
 787                insert_num, h);
 788
 789         /* Make balance in case insert_num < 0 */
 790         if (insert_num < 0) {
 791                 balance_internal_when_delete(tb, h, child_pos);
 792                 return order;
 793         }
 794
 795         k = 0;
 796         if (tb->lnum[h] > 0) {
 797                 /* shift lnum[h] items from S[h] to the left neighbor L[h].
 798                    check how many of new items fall into L[h] or CFL[h] after
 799                    shifting */
 800                 n = B_NR_ITEMS(tb->L[h]);       /* number of items in L[h] */
 801                 if (tb->lnum[h] <= child_pos) {
 802                         /* new items don't fall into L[h] or CFL[h] */
 803                         internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
 804                                             tb->lnum[h]);
 805                         /*internal_shift_left (tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,tb->lnum[h]); */
 806                         child_pos -= tb->lnum[h];
 807                 } else if (tb->lnum[h] > child_pos + insert_num) {
 808                         /* all new items fall into L[h] */
 809                         internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
 810                                             tb->lnum[h] - insert_num);
 811                         /*                  internal_shift_left(tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,
 812                            tb->lnum[h]-insert_num);
 813                          */
 814                         /* insert insert_num keys and node-pointers into L[h] */
 815                         bi.tb = tb;
 816                         bi.bi_bh = tb->L[h];
 817                         bi.bi_parent = tb->FL[h];
 818                         bi.bi_position = get_left_neighbor_position(tb, h);
 819                         internal_insert_childs(&bi,
 820                                                /*tb->L[h], tb->S[h-1]->b_next */
 821                                                n + child_pos + 1,
 822                                                insert_num, insert_key,
 823                                                insert_ptr);
 824
 825                         insert_num = 0;
 826                 } else {
 827                         struct disk_child *dc;
 828
 829                         /* some items fall into L[h] or CFL[h], but some don't fall */
 830                         internal_shift1_left(tb, h, child_pos + 1);
 831                         /* calculate number of new items that fall into L[h] */
 832                         k = tb->lnum[h] - child_pos - 1;
 833                         bi.tb = tb;
 834                         bi.bi_bh = tb->L[h];
 835                         bi.bi_parent = tb->FL[h];
 836                         bi.bi_position = get_left_neighbor_position(tb, h);
 837                         internal_insert_childs(&bi,
 838                                                /*tb->L[h], tb->S[h-1]->b_next, */
 839                                                n + child_pos + 1, k,
 840                                                insert_key, insert_ptr);
 841
 842                         replace_lkey(tb, h, insert_key + k);
 843
 844                         /* replace the first node-ptr in S[h] by node-ptr to insert_ptr[k] */
 845                         dc = B_N_CHILD(tbSh, 0);
 846                         put_dc_size(dc,
 847                                     MAX_CHILD_SIZE(insert_ptr[k]) -
 848                                     B_FREE_SPACE(insert_ptr[k]));
 849                         put_dc_block_number(dc, insert_ptr[k]->b_blocknr);
 850
 851                         do_balance_mark_internal_dirty(tb, tbSh, 0);
 852
 853                         k++;
 854                         insert_key += k;
 855                         insert_ptr += k;
 856                         insert_num -= k;
 857                         child_pos = 0;
 858                 }
 859         }
 860         /* tb->lnum[h] > 0 */
 861         if (tb->rnum[h] > 0) {
 862                 /*shift rnum[h] items from S[h] to the right neighbor R[h] */
 863                 /* check how many of new items fall into R or CFR after shifting */
 864                 n = B_NR_ITEMS(tbSh);   /* number of items in S[h] */
 865                 if (n - tb->rnum[h] >= child_pos)
 866                         /* new items fall into S[h] */
 867                         /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],tb->rnum[h]); */
 868                         internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 869                                              tb->rnum[h]);
 870                 else if (n + insert_num - tb->rnum[h] < child_pos) {
 871                         /* all new items fall into R[h] */
 872                         /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],
 873                            tb->rnum[h] - insert_num); */
 874                         internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 875                                              tb->rnum[h] - insert_num);
 876
 877                         /* insert insert_num keys and node-pointers into R[h] */
 878                         bi.tb = tb;
 879                         bi.bi_bh = tb->R[h];
 880                         bi.bi_parent = tb->FR[h];
 881                         bi.bi_position = get_right_neighbor_position(tb, h);
 882                         internal_insert_childs(&bi,
 883                                                /*tb->R[h],tb->S[h-1]->b_next */
 884                                                child_pos - n - insert_num +
 885                                                tb->rnum[h] - 1,
 886                                                insert_num, insert_key,
 887                                                insert_ptr);
 888                         insert_num = 0;
 889                 } else {
 890                         struct disk_child *dc;
 891
 892                         /* one of the items falls into CFR[h] */
 893                         internal_shift1_right(tb, h, n - child_pos + 1);
 894                         /* calculate number of new items that fall into R[h] */
 895                         k = tb->rnum[h] - n + child_pos - 1;
 896                         bi.tb = tb;
 897                         bi.bi_bh = tb->R[h];
 898                         bi.bi_parent = tb->FR[h];
 899                         bi.bi_position = get_right_neighbor_position(tb, h);
 900                         internal_insert_childs(&bi,
 901                                                /*tb->R[h], tb->R[h]->b_child, */
 902                                                0, k, insert_key + 1,
 903                                                insert_ptr + 1);
 904
 905                         replace_rkey(tb, h, insert_key + insert_num - k - 1);
 906
 907                         /* replace the first node-ptr in R[h] by node-ptr insert_ptr[insert_num-k-1] */
 908                         dc = B_N_CHILD(tb->R[h], 0);
 909                         put_dc_size(dc,
 910                                     MAX_CHILD_SIZE(insert_ptr
 911                                                    [insert_num - k - 1]) -
 912                                     B_FREE_SPACE(insert_ptr
 913                                                  [insert_num - k - 1]));
 914                         put_dc_block_number(dc,
 915                                             insert_ptr[insert_num - k -
 916                                                        1]->b_blocknr);
 917
 918                         do_balance_mark_internal_dirty(tb, tb->R[h], 0);
 919
 920                         insert_num -= (k + 1);
 921                 }
 922         }
 923
 924     /** Fill new node that appears instead of S[h] **/
 925         RFALSE(tb->blknum[h] > 2, "blknum can not be > 2 for internal level");
 926         RFALSE(tb->blknum[h] < 0, "blknum can not be < 0");
 927
 928         if (!tb->blknum[h]) {   /* node S[h] is empty now */
 929                 RFALSE(!tbSh, "S[h] is equal NULL");
 930
 931                 /* do what is needed for buffer thrown from tree */
 932                 reiserfs_invalidate_buffer(tb, tbSh);
 933                 return order;
 934         }
 935
 936         if (!tbSh) {
 937                 /* create new root */
 938                 struct disk_child *dc;
 939                 struct buffer_head *tbSh_1 = PATH_H_PBUFFER(tb->tb_path, h - 1);
 940                 struct block_head *blkh;
 941
 942                 if (tb->blknum[h] != 1)
 943                         reiserfs_panic(NULL, "ibalance-3", "One new node "
 944                                        "required for creating the new root");
 945                 /* S[h] = empty buffer from the list FEB. */
 946                 tbSh = get_FEB(tb);
 947                 blkh = B_BLK_HEAD(tbSh);
 948                 set_blkh_level(blkh, h + 1);
 949
 950                 /* Put the unique node-pointer to S[h] that points to S[h-1]. */
 951
 952                 dc = B_N_CHILD(tbSh, 0);
 953                 put_dc_block_number(dc, tbSh_1->b_blocknr);
 954                 put_dc_size(dc,
 955                             (MAX_CHILD_SIZE(tbSh_1) - B_FREE_SPACE(tbSh_1)));
 956
 957                 tb->insert_size[h] -= DC_SIZE;
 958                 set_blkh_free_space(blkh, blkh_free_space(blkh) - DC_SIZE);
 959
 960                 do_balance_mark_internal_dirty(tb, tbSh, 0);
 961
 962                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 963                 check_internal(tbSh);
 964                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 965
 966                 /* put new root into path structure */
 967                 PATH_OFFSET_PBUFFER(tb->tb_path, ILLEGAL_PATH_ELEMENT_OFFSET) =
 968                     tbSh;
 969
 970                 /* Change root in structure super block. */
 971                 PUT_SB_ROOT_BLOCK(tb->tb_sb, tbSh->b_blocknr);
 972                 PUT_SB_TREE_HEIGHT(tb->tb_sb, SB_TREE_HEIGHT(tb->tb_sb) + 1);
 973                 do_balance_mark_sb_dirty(tb, REISERFS_SB(tb->tb_sb)->s_sbh, 1);
 974         }
 975
 976         if (tb->blknum[h] == 2) {
 977                 int snum;
 978                 struct buffer_info dest_bi, src_bi;
 979
 980                 /* S_new = free buffer from list FEB */
 981                 S_new = get_FEB(tb);
 982
 983                 set_blkh_level(B_BLK_HEAD(S_new), h + 1);
 984
 985                 dest_bi.tb = tb;
 986                 dest_bi.bi_bh = S_new;
 987                 dest_bi.bi_parent = NULL;
 988                 dest_bi.bi_position = 0;
 989                 src_bi.tb = tb;
 990                 src_bi.bi_bh = tbSh;
 991                 src_bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
 992                 src_bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
 993
 994                 n = B_NR_ITEMS(tbSh);   /* number of items in S[h] */
 995                 snum = (insert_num + n + 1) / 2;
 996                 if (n - snum >= child_pos) {
 997                         /* new items don't fall into S_new */
 998                         /*  store the delimiting key for the next level */
 999                         /* new_insert_key = (n - snum)'th key in S[h] */
1000                         memcpy(&new_insert_key, B_N_PDELIM_KEY(tbSh, n - snum),
1001                                KEY_SIZE);
1002                         /* last parameter is del_par */
1003                         internal_move_pointers_items(&dest_bi, &src_bi,
1004                                                      LAST_TO_FIRST, snum, 0);
1005                         /*            internal_move_pointers_items(S_new, tbSh, LAST_TO_FIRST, snum, 0); */
1006                 } else if (n + insert_num - snum < child_pos) {
1007                         /* all new items fall into S_new */
1008                         /*  store the delimiting key for the next level */
1009                         /* new_insert_key = (n + insert_item - snum)'th key in S[h] */
1010                         memcpy(&new_insert_key,
1011                                B_N_PDELIM_KEY(tbSh, n + insert_num - snum),
1012                                KEY_SIZE);
1013                         /* last parameter is del_par */
1014                         internal_move_pointers_items(&dest_bi, &src_bi,
1015                                                      LAST_TO_FIRST,
1016                                                      snum - insert_num, 0);
1017                         /*                  internal_move_pointers_items(S_new,tbSh,1,snum - insert_num,0); */
1018
1019                         /* insert insert_num keys and node-pointers into S_new */
1020                         internal_insert_childs(&dest_bi,
1021                                                /*S_new,tb->S[h-1]->b_next, */
1022                                                child_pos - n - insert_num +
1023                                                snum - 1,
1024                                                insert_num, insert_key,
1025                                                insert_ptr);
1026
1027                         insert_num = 0;
1028                 } else {
1029                         struct disk_child *dc;
1030
1031                         /* some items fall into S_new, but some don't fall */
1032                         /* last parameter is del_par */
1033                         internal_move_pointers_items(&dest_bi, &src_bi,
1034                                                      LAST_TO_FIRST,
1035                                                      n - child_pos + 1, 1);
1036                         /*                  internal_move_pointers_items(S_new,tbSh,1,n - child_pos + 1,1); */
1037                         /* calculate number of new items that fall into S_new */
1038                         k = snum - n + child_pos - 1;
1039
1040                         internal_insert_childs(&dest_bi, /*S_new, */ 0, k,
1041                                                insert_key + 1, insert_ptr + 1);
1042
1043                         /* new_insert_key = insert_key[insert_num - k - 1] */
1044                         memcpy(&new_insert_key, insert_key + insert_num - k - 1,
1045                                KEY_SIZE);
1046                         /* replace first node-ptr in S_new by node-ptr to insert_ptr[insert_num-k-1] */
1047
1048                         dc = B_N_CHILD(S_new, 0);
1049                         put_dc_size(dc,
1050                                     (MAX_CHILD_SIZE
1051                                      (insert_ptr[insert_num - k - 1]) -
1052                                      B_FREE_SPACE(insert_ptr
1053                                                   [insert_num - k - 1])));
1054                         put_dc_block_number(dc,
1055                                             insert_ptr[insert_num - k -
1056                                                        1]->b_blocknr);
1057
1058                         do_balance_mark_internal_dirty(tb, S_new, 0);
1059
1060                         insert_num -= (k + 1);
1061                 }
1062                 /* new_insert_ptr = node_pointer to S_new */
1063                 new_insert_ptr = S_new;
1064
1065                 RFALSE(!buffer_journaled(S_new) || buffer_journal_dirty(S_new)
1066                        || buffer_dirty(S_new), "cm-00001: bad S_new (%b)",
1067                        S_new);
1068
1069                 // S_new is released in unfix_nodes
1070         }
1071
1072         n = B_NR_ITEMS(tbSh);   /*number of items in S[h] */
1073
1074         if (0 <= child_pos && child_pos <= n && insert_num > 0) {
1075                 bi.tb = tb;
1076                 bi.bi_bh = tbSh;
1077                 bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
1078                 bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
1079                 internal_insert_childs(&bi,     /*tbSh, */
1080                                        /*          ( tb->S[h-1]->b_parent == tb->S[h] ) ? tb->S[h-1]->b_next :  tb->S[h]->b_child->b_next, */
1081                                        child_pos, insert_num, insert_key,
1082                                        insert_ptr);
1083         }
1084
1085         memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE);
1086         insert_ptr[0] = new_insert_ptr;
1087
1088         return order;
1089 }