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 <linux/config.h>
   6 #include <asm/uaccess.h>
   7 #include <linux/string.h>
   8 #include <linux/time.h>
   9 #include <linux/reiserfs_fs.h>
  10 #include <linux/buffer_head.h>
  11
  12 /* this is one and only function that is used outside (do_balance.c) */
  13 int balance_internal(struct tree_balance *,
  14                      int, int, struct item_head *, struct buffer_head **);
  15
  16 /* modes of internal_shift_left, internal_shift_right and internal_insert_childs */
  17 #define INTERNAL_SHIFT_FROM_S_TO_L 0
  18 #define INTERNAL_SHIFT_FROM_R_TO_S 1
  19 #define INTERNAL_SHIFT_FROM_L_TO_S 2
  20 #define INTERNAL_SHIFT_FROM_S_TO_R 3
  21 #define INTERNAL_INSERT_TO_S 4
  22 #define INTERNAL_INSERT_TO_L 5
  23 #define INTERNAL_INSERT_TO_R 6
  24
  25 static void internal_define_dest_src_infos(int shift_mode,
  26                                            struct tree_balance *tb,
  27                                            int h,
  28                                            struct buffer_info *dest_bi,
  29                                            struct buffer_info *src_bi,
  30                                            int *d_key, struct buffer_head **cf)
  31 {
  32         memset(dest_bi, 0, sizeof(struct buffer_info));
  33         memset(src_bi, 0, sizeof(struct buffer_info));
  34         /* define dest, src, dest parent, dest position */
  35         switch (shift_mode) {
  36         case INTERNAL_SHIFT_FROM_S_TO_L:        /* used in internal_shift_left */
  37                 src_bi->tb = tb;
  38                 src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  39                 src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  40                 src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  41                 dest_bi->tb = tb;
  42                 dest_bi->bi_bh = tb->L[h];
  43                 dest_bi->bi_parent = tb->FL[h];
  44                 dest_bi->bi_position = get_left_neighbor_position(tb, h);
  45                 *d_key = tb->lkey[h];
  46                 *cf = tb->CFL[h];
  47                 break;
  48         case INTERNAL_SHIFT_FROM_L_TO_S:
  49                 src_bi->tb = tb;
  50                 src_bi->bi_bh = tb->L[h];
  51                 src_bi->bi_parent = tb->FL[h];
  52                 src_bi->bi_position = get_left_neighbor_position(tb, h);
  53                 dest_bi->tb = tb;
  54                 dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  55                 dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  56                 dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);     /* dest position is analog of dest->b_item_order */
  57                 *d_key = tb->lkey[h];
  58                 *cf = tb->CFL[h];
  59                 break;
  60
  61         case INTERNAL_SHIFT_FROM_R_TO_S:        /* used in internal_shift_left */
  62                 src_bi->tb = tb;
  63                 src_bi->bi_bh = tb->R[h];
  64                 src_bi->bi_parent = tb->FR[h];
  65                 src_bi->bi_position = get_right_neighbor_position(tb, h);
  66                 dest_bi->tb = tb;
  67                 dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  68                 dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  69                 dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  70                 *d_key = tb->rkey[h];
  71                 *cf = tb->CFR[h];
  72                 break;
  73
  74         case INTERNAL_SHIFT_FROM_S_TO_R:
  75                 src_bi->tb = tb;
  76                 src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  77                 src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  78                 src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  79                 dest_bi->tb = tb;
  80                 dest_bi->bi_bh = tb->R[h];
  81                 dest_bi->bi_parent = tb->FR[h];
  82                 dest_bi->bi_position = get_right_neighbor_position(tb, h);
  83                 *d_key = tb->rkey[h];
  84                 *cf = tb->CFR[h];
  85                 break;
  86
  87         case INTERNAL_INSERT_TO_L:
  88                 dest_bi->tb = tb;
  89                 dest_bi->bi_bh = tb->L[h];
  90                 dest_bi->bi_parent = tb->FL[h];
  91                 dest_bi->bi_position = get_left_neighbor_position(tb, h);
  92                 break;
  93
  94         case INTERNAL_INSERT_TO_S:
  95                 dest_bi->tb = tb;
  96                 dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h);
  97                 dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h);
  98                 dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
  99                 break;
 100
 101         case INTERNAL_INSERT_TO_R:
 102                 dest_bi->tb = tb;
 103                 dest_bi->bi_bh = tb->R[h];
 104                 dest_bi->bi_parent = tb->FR[h];
 105                 dest_bi->bi_position = get_right_neighbor_position(tb, h);
 106                 break;
 107
 108         default:
 109                 reiserfs_panic(tb->tb_sb,
 110                                "internal_define_dest_src_infos: shift type is unknown (%d)",
 111                                shift_mode);
 112         }
 113 }
 114
 115 /* Insert count node pointers into buffer cur before position to + 1.
 116  * Insert count items into buffer cur before position to.
 117  * Items and node pointers are specified by inserted and bh respectively.
 118  */
 119 static void internal_insert_childs(struct buffer_info *cur_bi,
 120                                    int to, int count,
 121                                    struct item_head *inserted,
 122                                    struct buffer_head **bh)
 123 {
 124         struct buffer_head *cur = cur_bi->bi_bh;
 125         struct block_head *blkh;
 126         int nr;
 127         struct reiserfs_key *ih;
 128         struct disk_child new_dc[2];
 129         struct disk_child *dc;
 130         int i;
 131
 132         if (count <= 0)
 133                 return;
 134
 135         blkh = B_BLK_HEAD(cur);
 136         nr = blkh_nr_item(blkh);
 137
 138         RFALSE(count > 2, "too many children (%d) are to be inserted", count);
 139         RFALSE(B_FREE_SPACE(cur) < count * (KEY_SIZE + DC_SIZE),
 140                "no enough free space (%d), needed %d bytes",
 141                B_FREE_SPACE(cur), count * (KEY_SIZE + DC_SIZE));
 142
 143         /* prepare space for count disk_child */
 144         dc = B_N_CHILD(cur, to + 1);
 145
 146         memmove(dc + count, dc, (nr + 1 - (to + 1)) * DC_SIZE);
 147
 148         /* copy to_be_insert disk children */
 149         for (i = 0; i < count; i++) {
 150                 put_dc_size(&(new_dc[i]),
 151                             MAX_CHILD_SIZE(bh[i]) - B_FREE_SPACE(bh[i]));
 152                 put_dc_block_number(&(new_dc[i]), bh[i]->b_blocknr);
 153         }
 154         memcpy(dc, new_dc, DC_SIZE * count);
 155
 156         /* prepare space for count items  */
 157         ih = B_N_PDELIM_KEY(cur, ((to == -1) ? 0 : to));
 158
 159         memmove(ih + count, ih,
 160                 (nr - to) * KEY_SIZE + (nr + 1 + count) * DC_SIZE);
 161
 162         /* copy item headers (keys) */
 163         memcpy(ih, inserted, KEY_SIZE);
 164         if (count > 1)
 165                 memcpy(ih + 1, inserted + 1, KEY_SIZE);
 166
 167         /* sizes, item number */
 168         set_blkh_nr_item(blkh, blkh_nr_item(blkh) + count);
 169         set_blkh_free_space(blkh,
 170                             blkh_free_space(blkh) - count * (DC_SIZE +
 171                                                              KEY_SIZE));
 172
 173         do_balance_mark_internal_dirty(cur_bi->tb, cur, 0);
 174
 175         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 176         check_internal(cur);
 177         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 178
 179         if (cur_bi->bi_parent) {
 180                 struct disk_child *t_dc =
 181                     B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position);
 182                 put_dc_size(t_dc,
 183                             dc_size(t_dc) + (count * (DC_SIZE + KEY_SIZE)));
 184                 do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent,
 185                                                0);
 186
 187                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 188                 check_internal(cur_bi->bi_parent);
 189                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 190         }
 191
 192 }
 193
 194 /* Delete del_num items and node pointers from buffer cur starting from *
 195  * the first_i'th item and first_p'th pointers respectively.            */
 196 static void internal_delete_pointers_items(struct buffer_info *cur_bi,
 197                                            int first_p,
 198                                            int first_i, int del_num)
 199 {
 200         struct buffer_head *cur = cur_bi->bi_bh;
 201         int nr;
 202         struct block_head *blkh;
 203         struct reiserfs_key *key;
 204         struct disk_child *dc;
 205
 206         RFALSE(cur == NULL, "buffer is 0");
 207         RFALSE(del_num < 0,
 208                "negative number of items (%d) can not be deleted", del_num);
 209         RFALSE(first_p < 0 || first_p + del_num > B_NR_ITEMS(cur) + 1
 210                || first_i < 0,
 211                "first pointer order (%d) < 0 or "
 212                "no so many pointers (%d), only (%d) or "
 213                "first key order %d < 0", first_p, first_p + del_num,
 214                B_NR_ITEMS(cur) + 1, first_i);
 215         if (del_num == 0)
 216                 return;
 217
 218         blkh = B_BLK_HEAD(cur);
 219         nr = blkh_nr_item(blkh);
 220
 221         if (first_p == 0 && del_num == nr + 1) {
 222                 RFALSE(first_i != 0,
 223                        "1st deleted key must have order 0, not %d", first_i);
 224                 make_empty_node(cur_bi);
 225                 return;
 226         }
 227
 228         RFALSE(first_i + del_num > B_NR_ITEMS(cur),
 229                "first_i = %d del_num = %d "
 230                "no so many keys (%d) in the node (%b)(%z)",
 231                first_i, del_num, first_i + del_num, cur, cur);
 232
 233         /* deleting */
 234         dc = B_N_CHILD(cur, first_p);
 235
 236         memmove(dc, dc + del_num, (nr + 1 - first_p - del_num) * DC_SIZE);
 237         key = B_N_PDELIM_KEY(cur, first_i);
 238         memmove(key, key + del_num,
 239                 (nr - first_i - del_num) * KEY_SIZE + (nr + 1 -
 240                                                        del_num) * DC_SIZE);
 241
 242         /* sizes, item number */
 243         set_blkh_nr_item(blkh, blkh_nr_item(blkh) - del_num);
 244         set_blkh_free_space(blkh,
 245                             blkh_free_space(blkh) +
 246                             (del_num * (KEY_SIZE + DC_SIZE)));
 247
 248         do_balance_mark_internal_dirty(cur_bi->tb, cur, 0);
 249         /*&&&&&&&&&&&&&&&&&&&&&&& */
 250         check_internal(cur);
 251         /*&&&&&&&&&&&&&&&&&&&&&&& */
 252
 253         if (cur_bi->bi_parent) {
 254                 struct disk_child *t_dc;
 255                 t_dc = B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position);
 256                 put_dc_size(t_dc,
 257                             dc_size(t_dc) - (del_num * (KEY_SIZE + DC_SIZE)));
 258
 259                 do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent,
 260                                                0);
 261                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 262                 check_internal(cur_bi->bi_parent);
 263                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 264         }
 265 }
 266
 267 /* delete n node pointers and items starting from given position */
 268 static void internal_delete_childs(struct buffer_info *cur_bi, int from, int n)
 269 {
 270         int i_from;
 271
 272         i_from = (from == 0) ? from : from - 1;
 273
 274         /* delete n pointers starting from `from' position in CUR;
 275            delete n keys starting from 'i_from' position in CUR;
 276          */
 277         internal_delete_pointers_items(cur_bi, from, i_from, n);
 278 }
 279
 280 /* copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest
 281 * last_first == FIRST_TO_LAST means, that we copy first items from src to tail of dest
 282  * last_first == LAST_TO_FIRST means, that we copy last items from src to head of dest
 283  */
 284 static void internal_copy_pointers_items(struct buffer_info *dest_bi,
 285                                          struct buffer_head *src,
 286                                          int last_first, int cpy_num)
 287 {
 288         /* ATTENTION! Number of node pointers in DEST is equal to number of items in DEST *
 289          * as delimiting key have already inserted to buffer dest.*/
 290         struct buffer_head *dest = dest_bi->bi_bh;
 291         int nr_dest, nr_src;
 292         int dest_order, src_order;
 293         struct block_head *blkh;
 294         struct reiserfs_key *key;
 295         struct disk_child *dc;
 296
 297         nr_src = B_NR_ITEMS(src);
 298
 299         RFALSE(dest == NULL || src == NULL,
 300                "src (%p) or dest (%p) buffer is 0", src, dest);
 301         RFALSE(last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST,
 302                "invalid last_first parameter (%d)", last_first);
 303         RFALSE(nr_src < cpy_num - 1,
 304                "no so many items (%d) in src (%d)", cpy_num, nr_src);
 305         RFALSE(cpy_num < 0, "cpy_num less than 0 (%d)", cpy_num);
 306         RFALSE(cpy_num - 1 + B_NR_ITEMS(dest) > (int)MAX_NR_KEY(dest),
 307                "cpy_num (%d) + item number in dest (%d) can not be > MAX_NR_KEY(%d)",
 308                cpy_num, B_NR_ITEMS(dest), MAX_NR_KEY(dest));
 309
 310         if (cpy_num == 0)
 311                 return;
 312
 313         /* coping */
 314         blkh = B_BLK_HEAD(dest);
 315         nr_dest = blkh_nr_item(blkh);
 316
 317         /*dest_order = (last_first == LAST_TO_FIRST) ? 0 : nr_dest; */
 318         /*src_order = (last_first == LAST_TO_FIRST) ? (nr_src - cpy_num + 1) : 0; */
 319         (last_first == LAST_TO_FIRST) ? (dest_order = 0, src_order =
 320                                          nr_src - cpy_num + 1) : (dest_order =
 321                                                                   nr_dest,
 322                                                                   src_order =
 323                                                                   0);
 324
 325         /* prepare space for cpy_num pointers */
 326         dc = B_N_CHILD(dest, dest_order);
 327
 328         memmove(dc + cpy_num, dc, (nr_dest - dest_order) * DC_SIZE);
 329
 330         /* insert pointers */
 331         memcpy(dc, B_N_CHILD(src, src_order), DC_SIZE * cpy_num);
 332
 333         /* prepare space for cpy_num - 1 item headers */
 334         key = B_N_PDELIM_KEY(dest, dest_order);
 335         memmove(key + cpy_num - 1, key,
 336                 KEY_SIZE * (nr_dest - dest_order) + DC_SIZE * (nr_dest +
 337                                                                cpy_num));
 338
 339         /* insert headers */
 340         memcpy(key, B_N_PDELIM_KEY(src, src_order), KEY_SIZE * (cpy_num - 1));
 341
 342         /* sizes, item number */
 343         set_blkh_nr_item(blkh, blkh_nr_item(blkh) + (cpy_num - 1));
 344         set_blkh_free_space(blkh,
 345                             blkh_free_space(blkh) - (KEY_SIZE * (cpy_num - 1) +
 346                                                      DC_SIZE * cpy_num));
 347
 348         do_balance_mark_internal_dirty(dest_bi->tb, dest, 0);
 349
 350         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 351         check_internal(dest);
 352         /*&&&&&&&&&&&&&&&&&&&&&&&& */
 353
 354         if (dest_bi->bi_parent) {
 355                 struct disk_child *t_dc;
 356                 t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
 357                 put_dc_size(t_dc,
 358                             dc_size(t_dc) + (KEY_SIZE * (cpy_num - 1) +
 359                                              DC_SIZE * cpy_num));
 360
 361                 do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
 362                                                0);
 363                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 364                 check_internal(dest_bi->bi_parent);
 365                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 366         }
 367
 368 }
 369
 370 /* Copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest.
 371  * Delete cpy_num - del_par items and node pointers from buffer src.
 372  * last_first == FIRST_TO_LAST means, that we copy/delete first items from src.
 373  * last_first == LAST_TO_FIRST means, that we copy/delete last items from src.
 374  */
 375 static void internal_move_pointers_items(struct buffer_info *dest_bi,
 376                                          struct buffer_info *src_bi,
 377                                          int last_first, int cpy_num,
 378                                          int del_par)
 379 {
 380         int first_pointer;
 381         int first_item;
 382
 383         internal_copy_pointers_items(dest_bi, src_bi->bi_bh, last_first,
 384                                      cpy_num);
 385
 386         if (last_first == FIRST_TO_LAST) {      /* shift_left occurs */
 387                 first_pointer = 0;
 388                 first_item = 0;
 389                 /* delete cpy_num - del_par pointers and keys starting for pointers with first_pointer,
 390                    for key - with first_item */
 391                 internal_delete_pointers_items(src_bi, first_pointer,
 392                                                first_item, cpy_num - del_par);
 393         } else {                /* shift_right occurs */
 394                 int i, j;
 395
 396                 i = (cpy_num - del_par ==
 397                      (j =
 398                       B_NR_ITEMS(src_bi->bi_bh)) + 1) ? 0 : j - cpy_num +
 399                     del_par;
 400
 401                 internal_delete_pointers_items(src_bi,
 402                                                j + 1 - cpy_num + del_par, i,
 403                                                cpy_num - del_par);
 404         }
 405 }
 406
 407 /* Insert n_src'th key of buffer src before n_dest'th key of buffer dest. */
 408 static void internal_insert_key(struct buffer_info *dest_bi, int dest_position_before,  /* insert key before key with n_dest number */
 409                                 struct buffer_head *src, int src_position)
 410 {
 411         struct buffer_head *dest = dest_bi->bi_bh;
 412         int nr;
 413         struct block_head *blkh;
 414         struct reiserfs_key *key;
 415
 416         RFALSE(dest == NULL || src == NULL,
 417                "source(%p) or dest(%p) buffer is 0", src, dest);
 418         RFALSE(dest_position_before < 0 || src_position < 0,
 419                "source(%d) or dest(%d) key number less than 0",
 420                src_position, dest_position_before);
 421         RFALSE(dest_position_before > B_NR_ITEMS(dest) ||
 422                src_position >= B_NR_ITEMS(src),
 423                "invalid position in dest (%d (key number %d)) or in src (%d (key number %d))",
 424                dest_position_before, B_NR_ITEMS(dest),
 425                src_position, B_NR_ITEMS(src));
 426         RFALSE(B_FREE_SPACE(dest) < KEY_SIZE,
 427                "no enough free space (%d) in dest buffer", B_FREE_SPACE(dest));
 428
 429         blkh = B_BLK_HEAD(dest);
 430         nr = blkh_nr_item(blkh);
 431
 432         /* prepare space for inserting key */
 433         key = B_N_PDELIM_KEY(dest, dest_position_before);
 434         memmove(key + 1, key,
 435                 (nr - dest_position_before) * KEY_SIZE + (nr + 1) * DC_SIZE);
 436
 437         /* insert key */
 438         memcpy(key, B_N_PDELIM_KEY(src, src_position), KEY_SIZE);
 439
 440         /* Change dirt, free space, item number fields. */
 441
 442         set_blkh_nr_item(blkh, blkh_nr_item(blkh) + 1);
 443         set_blkh_free_space(blkh, blkh_free_space(blkh) - KEY_SIZE);
 444
 445         do_balance_mark_internal_dirty(dest_bi->tb, dest, 0);
 446
 447         if (dest_bi->bi_parent) {
 448                 struct disk_child *t_dc;
 449                 t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position);
 450                 put_dc_size(t_dc, dc_size(t_dc) + KEY_SIZE);
 451
 452                 do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
 453                                                0);
 454         }
 455 }
 456
 457 /* Insert d_key'th (delimiting) key from buffer cfl to tail of dest.
 458  * Copy pointer_amount node pointers and pointer_amount - 1 items from buffer src to buffer dest.
 459  * Replace  d_key'th key in buffer cfl.
 460  * Delete pointer_amount items and node pointers from buffer src.
 461  */
 462 /* this can be invoked both to shift from S to L and from R to S */
 463 static void internal_shift_left(int mode,       /* INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S */
 464                                 struct tree_balance *tb,
 465                                 int h, int pointer_amount)
 466 {
 467         struct buffer_info dest_bi, src_bi;
 468         struct buffer_head *cf;
 469         int d_key_position;
 470
 471         internal_define_dest_src_infos(mode, tb, h, &dest_bi, &src_bi,
 472                                        &d_key_position, &cf);
 473
 474         /*printk("pointer_amount = %d\n",pointer_amount); */
 475
 476         if (pointer_amount) {
 477                 /* insert delimiting key from common father of dest and src to node dest into position B_NR_ITEM(dest) */
 478                 internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf,
 479                                     d_key_position);
 480
 481                 if (B_NR_ITEMS(src_bi.bi_bh) == pointer_amount - 1) {
 482                         if (src_bi.bi_position /*src->b_item_order */  == 0)
 483                                 replace_key(tb, cf, d_key_position,
 484                                             src_bi.
 485                                             bi_parent /*src->b_parent */ , 0);
 486                 } else
 487                         replace_key(tb, cf, d_key_position, src_bi.bi_bh,
 488                                     pointer_amount - 1);
 489         }
 490         /* last parameter is del_parameter */
 491         internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST,
 492                                      pointer_amount, 0);
 493
 494 }
 495
 496 /* Insert delimiting key to L[h].
 497  * Copy n node pointers and n - 1 items from buffer S[h] to L[h].
 498  * Delete n - 1 items and node pointers from buffer S[h].
 499  */
 500 /* it always shifts from S[h] to L[h] */
 501 static void internal_shift1_left(struct tree_balance *tb,
 502                                  int h, int pointer_amount)
 503 {
 504         struct buffer_info dest_bi, src_bi;
 505         struct buffer_head *cf;
 506         int d_key_position;
 507
 508         internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
 509                                        &dest_bi, &src_bi, &d_key_position, &cf);
 510
 511         if (pointer_amount > 0) /* insert lkey[h]-th key  from CFL[h] to left neighbor L[h] */
 512                 internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf,
 513                                     d_key_position);
 514         /*            internal_insert_key (tb->L[h], B_NR_ITEM(tb->L[h]), tb->CFL[h], tb->lkey[h]); */
 515
 516         /* last parameter is del_parameter */
 517         internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST,
 518                                      pointer_amount, 1);
 519         /*    internal_move_pointers_items (tb->L[h], tb->S[h], FIRST_TO_LAST, pointer_amount, 1); */
 520 }
 521
 522 /* Insert d_key'th (delimiting) key from buffer cfr to head of dest.
 523  * Copy n node pointers and n - 1 items from buffer src to buffer dest.
 524  * Replace  d_key'th key in buffer cfr.
 525  * Delete n items and node pointers from buffer src.
 526  */
 527 static void internal_shift_right(int mode,      /* INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S */
 528                                  struct tree_balance *tb,
 529                                  int h, int pointer_amount)
 530 {
 531         struct buffer_info dest_bi, src_bi;
 532         struct buffer_head *cf;
 533         int d_key_position;
 534         int nr;
 535
 536         internal_define_dest_src_infos(mode, tb, h, &dest_bi, &src_bi,
 537                                        &d_key_position, &cf);
 538
 539         nr = B_NR_ITEMS(src_bi.bi_bh);
 540
 541         if (pointer_amount > 0) {
 542                 /* insert delimiting key from common father of dest and src to dest node into position 0 */
 543                 internal_insert_key(&dest_bi, 0, cf, d_key_position);
 544                 if (nr == pointer_amount - 1) {
 545                         RFALSE(src_bi.bi_bh != PATH_H_PBUFFER(tb->tb_path, h) /*tb->S[h] */ ||
 546                                dest_bi.bi_bh != tb->R[h],
 547                                "src (%p) must be == tb->S[h](%p) when it disappears",
 548                                src_bi.bi_bh, PATH_H_PBUFFER(tb->tb_path, h));
 549                         /* when S[h] disappers replace left delemiting key as well */
 550                         if (tb->CFL[h])
 551                                 replace_key(tb, cf, d_key_position, tb->CFL[h],
 552                                             tb->lkey[h]);
 553                 } else
 554                         replace_key(tb, cf, d_key_position, src_bi.bi_bh,
 555                                     nr - pointer_amount);
 556         }
 557
 558         /* last parameter is del_parameter */
 559         internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST,
 560                                      pointer_amount, 0);
 561 }
 562
 563 /* Insert delimiting key to R[h].
 564  * Copy n node pointers and n - 1 items from buffer S[h] to R[h].
 565  * Delete n - 1 items and node pointers from buffer S[h].
 566  */
 567 /* it always shift from S[h] to R[h] */
 568 static void internal_shift1_right(struct tree_balance *tb,
 569                                   int h, int pointer_amount)
 570 {
 571         struct buffer_info dest_bi, src_bi;
 572         struct buffer_head *cf;
 573         int d_key_position;
 574
 575         internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 576                                        &dest_bi, &src_bi, &d_key_position, &cf);
 577
 578         if (pointer_amount > 0) /* insert rkey from CFR[h] to right neighbor R[h] */
 579                 internal_insert_key(&dest_bi, 0, cf, d_key_position);
 580         /*            internal_insert_key (tb->R[h], 0, tb->CFR[h], tb->rkey[h]); */
 581
 582         /* last parameter is del_parameter */
 583         internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST,
 584                                      pointer_amount, 1);
 585         /*    internal_move_pointers_items (tb->R[h], tb->S[h], LAST_TO_FIRST, pointer_amount, 1); */
 586 }
 587
 588 /* Delete insert_num node pointers together with their left items
 589  * and balance current node.*/
 590 static void balance_internal_when_delete(struct tree_balance *tb,
 591                                          int h, int child_pos)
 592 {
 593         int insert_num;
 594         int n;
 595         struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h);
 596         struct buffer_info bi;
 597
 598         insert_num = tb->insert_size[h] / ((int)(DC_SIZE + KEY_SIZE));
 599
 600         /* delete child-node-pointer(s) together with their left item(s) */
 601         bi.tb = tb;
 602         bi.bi_bh = tbSh;
 603         bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
 604         bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
 605
 606         internal_delete_childs(&bi, child_pos, -insert_num);
 607
 608         RFALSE(tb->blknum[h] > 1,
 609                "tb->blknum[%d]=%d when insert_size < 0", h, tb->blknum[h]);
 610
 611         n = B_NR_ITEMS(tbSh);
 612
 613         if (tb->lnum[h] == 0 && tb->rnum[h] == 0) {
 614                 if (tb->blknum[h] == 0) {
 615                         /* node S[h] (root of the tree) is empty now */
 616                         struct buffer_head *new_root;
 617
 618                         RFALSE(n
 619                                || B_FREE_SPACE(tbSh) !=
 620                                MAX_CHILD_SIZE(tbSh) - DC_SIZE,
 621                                "buffer must have only 0 keys (%d)", n);
 622                         RFALSE(bi.bi_parent, "root has parent (%p)",
 623                                bi.bi_parent);
 624
 625                         /* choose a new root */
 626                         if (!tb->L[h - 1] || !B_NR_ITEMS(tb->L[h - 1]))
 627                                 new_root = tb->R[h - 1];
 628                         else
 629                                 new_root = tb->L[h - 1];
 630                         /* switch super block's tree root block number to the new value */
 631                         PUT_SB_ROOT_BLOCK(tb->tb_sb, new_root->b_blocknr);
 632                         //REISERFS_SB(tb->tb_sb)->s_rs->s_tree_height --;
 633                         PUT_SB_TREE_HEIGHT(tb->tb_sb,
 634                                            SB_TREE_HEIGHT(tb->tb_sb) - 1);
 635
 636                         do_balance_mark_sb_dirty(tb,
 637                                                  REISERFS_SB(tb->tb_sb)->s_sbh,
 638                                                  1);
 639                         /*&&&&&&&&&&&&&&&&&&&&&& */
 640                         if (h > 1)
 641                                 /* use check_internal if new root is an internal node */
 642                                 check_internal(new_root);
 643                         /*&&&&&&&&&&&&&&&&&&&&&& */
 644
 645                         /* do what is needed for buffer thrown from tree */
 646                         reiserfs_invalidate_buffer(tb, tbSh);
 647                         return;
 648                 }
 649                 return;
 650         }
 651
 652         if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) {     /* join S[h] with L[h] */
 653
 654                 RFALSE(tb->rnum[h] != 0,
 655                        "invalid tb->rnum[%d]==%d when joining S[h] with L[h]",
 656                        h, tb->rnum[h]);
 657
 658                 internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, n + 1);
 659                 reiserfs_invalidate_buffer(tb, tbSh);
 660
 661                 return;
 662         }
 663
 664         if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) {     /* join S[h] with R[h] */
 665                 RFALSE(tb->lnum[h] != 0,
 666                        "invalid tb->lnum[%d]==%d when joining S[h] with R[h]",
 667                        h, tb->lnum[h]);
 668
 669                 internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, n + 1);
 670
 671                 reiserfs_invalidate_buffer(tb, tbSh);
 672                 return;
 673         }
 674
 675         if (tb->lnum[h] < 0) {  /* borrow from left neighbor L[h] */
 676                 RFALSE(tb->rnum[h] != 0,
 677                        "wrong tb->rnum[%d]==%d when borrow from L[h]", h,
 678                        tb->rnum[h]);
 679                 /*internal_shift_right (tb, h, tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], -tb->lnum[h]); */
 680                 internal_shift_right(INTERNAL_SHIFT_FROM_L_TO_S, tb, h,
 681                                      -tb->lnum[h]);
 682                 return;
 683         }
 684
 685         if (tb->rnum[h] < 0) {  /* borrow from right neighbor R[h] */
 686                 RFALSE(tb->lnum[h] != 0,
 687                        "invalid tb->lnum[%d]==%d when borrow from R[h]",
 688                        h, tb->lnum[h]);
 689                 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]); */
 690                 return;
 691         }
 692
 693         if (tb->lnum[h] > 0) {  /* split S[h] into two parts and put them into neighbors */
 694                 RFALSE(tb->rnum[h] == 0 || tb->lnum[h] + tb->rnum[h] != n + 1,
 695                        "invalid tb->lnum[%d]==%d or tb->rnum[%d]==%d when S[h](item number == %d) is split between them",
 696                        h, tb->lnum[h], h, tb->rnum[h], n);
 697
 698                 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]); */
 699                 internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 700                                      tb->rnum[h]);
 701
 702                 reiserfs_invalidate_buffer(tb, tbSh);
 703
 704                 return;
 705         }
 706         reiserfs_panic(tb->tb_sb,
 707                        "balance_internal_when_delete: unexpected tb->lnum[%d]==%d or tb->rnum[%d]==%d",
 708                        h, tb->lnum[h], h, tb->rnum[h]);
 709 }
 710
 711 /* Replace delimiting key of buffers L[h] and S[h] by the given key.*/
 712 static void replace_lkey(struct tree_balance *tb, int h, struct item_head *key)
 713 {
 714         RFALSE(tb->L[h] == NULL || tb->CFL[h] == NULL,
 715                "L[h](%p) and CFL[h](%p) must exist in replace_lkey",
 716                tb->L[h], tb->CFL[h]);
 717
 718         if (B_NR_ITEMS(PATH_H_PBUFFER(tb->tb_path, h)) == 0)
 719                 return;
 720
 721         memcpy(B_N_PDELIM_KEY(tb->CFL[h], tb->lkey[h]), key, KEY_SIZE);
 722
 723         do_balance_mark_internal_dirty(tb, tb->CFL[h], 0);
 724 }
 725
 726 /* Replace delimiting key of buffers S[h] and R[h] by the given key.*/
 727 static void replace_rkey(struct tree_balance *tb, int h, struct item_head *key)
 728 {
 729         RFALSE(tb->R[h] == NULL || tb->CFR[h] == NULL,
 730                "R[h](%p) and CFR[h](%p) must exist in replace_rkey",
 731                tb->R[h], tb->CFR[h]);
 732         RFALSE(B_NR_ITEMS(tb->R[h]) == 0,
 733                "R[h] can not be empty if it exists (item number=%d)",
 734                B_NR_ITEMS(tb->R[h]));
 735
 736         memcpy(B_N_PDELIM_KEY(tb->CFR[h], tb->rkey[h]), key, KEY_SIZE);
 737
 738         do_balance_mark_internal_dirty(tb, tb->CFR[h], 0);
 739 }
 740
 741 int balance_internal(struct tree_balance *tb,   /* tree_balance structure               */
 742                      int h,     /* level of the tree                    */
 743                      int child_pos, struct item_head *insert_key,       /* key for insertion on higher level    */
 744                      struct buffer_head **insert_ptr    /* node for insertion on higher level */
 745     )
 746     /* if inserting/pasting
 747        {
 748        child_pos is the position of the node-pointer in S[h] that        *
 749        pointed to S[h-1] before balancing of the h-1 level;              *
 750        this means that new pointers and items must be inserted AFTER *
 751        child_pos
 752        }
 753        else
 754        {
 755        it is the position of the leftmost pointer that must be deleted (together with
 756        its corresponding key to the left of the pointer)
 757        as a result of the previous level's balancing.
 758        }
 759      */
 760 {
 761         struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h);
 762         struct buffer_info bi;
 763         int order;              /* we return this: it is 0 if there is no S[h], else it is tb->S[h]->b_item_order */
 764         int insert_num, n, k;
 765         struct buffer_head *S_new;
 766         struct item_head new_insert_key;
 767         struct buffer_head *new_insert_ptr = NULL;
 768         struct item_head *new_insert_key_addr = insert_key;
 769
 770         RFALSE(h < 1, "h (%d) can not be < 1 on internal level", h);
 771
 772         PROC_INFO_INC(tb->tb_sb, balance_at[h]);
 773
 774         order =
 775             (tbSh) ? PATH_H_POSITION(tb->tb_path,
 776                                      h + 1) /*tb->S[h]->b_item_order */ : 0;
 777
 778         /* Using insert_size[h] calculate the number insert_num of items
 779            that must be inserted to or deleted from S[h]. */
 780         insert_num = tb->insert_size[h] / ((int)(KEY_SIZE + DC_SIZE));
 781
 782         /* Check whether insert_num is proper * */
 783         RFALSE(insert_num < -2 || insert_num > 2,
 784                "incorrect number of items inserted to the internal node (%d)",
 785                insert_num);
 786         RFALSE(h > 1 && (insert_num > 1 || insert_num < -1),
 787                "incorrect number of items (%d) inserted to the internal node on a level (h=%d) higher than last internal level",
 788                insert_num, h);
 789
 790         /* Make balance in case insert_num < 0 */
 791         if (insert_num < 0) {
 792                 balance_internal_when_delete(tb, h, child_pos);
 793                 return order;
 794         }
 795
 796         k = 0;
 797         if (tb->lnum[h] > 0) {
 798                 /* shift lnum[h] items from S[h] to the left neighbor L[h].
 799                    check how many of new items fall into L[h] or CFL[h] after
 800                    shifting */
 801                 n = B_NR_ITEMS(tb->L[h]);       /* number of items in L[h] */
 802                 if (tb->lnum[h] <= child_pos) {
 803                         /* new items don't fall into L[h] or CFL[h] */
 804                         internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
 805                                             tb->lnum[h]);
 806                         /*internal_shift_left (tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,tb->lnum[h]); */
 807                         child_pos -= tb->lnum[h];
 808                 } else if (tb->lnum[h] > child_pos + insert_num) {
 809                         /* all new items fall into L[h] */
 810                         internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h,
 811                                             tb->lnum[h] - insert_num);
 812                         /*                  internal_shift_left(tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,
 813                            tb->lnum[h]-insert_num);
 814                          */
 815                         /* insert insert_num keys and node-pointers into L[h] */
 816                         bi.tb = tb;
 817                         bi.bi_bh = tb->L[h];
 818                         bi.bi_parent = tb->FL[h];
 819                         bi.bi_position = get_left_neighbor_position(tb, h);
 820                         internal_insert_childs(&bi,
 821                                                /*tb->L[h], tb->S[h-1]->b_next */
 822                                                n + child_pos + 1,
 823                                                insert_num, insert_key,
 824                                                insert_ptr);
 825
 826                         insert_num = 0;
 827                 } else {
 828                         struct disk_child *dc;
 829
 830                         /* some items fall into L[h] or CFL[h], but some don't fall */
 831                         internal_shift1_left(tb, h, child_pos + 1);
 832                         /* calculate number of new items that fall into L[h] */
 833                         k = tb->lnum[h] - child_pos - 1;
 834                         bi.tb = tb;
 835                         bi.bi_bh = tb->L[h];
 836                         bi.bi_parent = tb->FL[h];
 837                         bi.bi_position = get_left_neighbor_position(tb, h);
 838                         internal_insert_childs(&bi,
 839                                                /*tb->L[h], tb->S[h-1]->b_next, */
 840                                                n + child_pos + 1, k,
 841                                                insert_key, insert_ptr);
 842
 843                         replace_lkey(tb, h, insert_key + k);
 844
 845                         /* replace the first node-ptr in S[h] by node-ptr to insert_ptr[k] */
 846                         dc = B_N_CHILD(tbSh, 0);
 847                         put_dc_size(dc,
 848                                     MAX_CHILD_SIZE(insert_ptr[k]) -
 849                                     B_FREE_SPACE(insert_ptr[k]));
 850                         put_dc_block_number(dc, insert_ptr[k]->b_blocknr);
 851
 852                         do_balance_mark_internal_dirty(tb, tbSh, 0);
 853
 854                         k++;
 855                         insert_key += k;
 856                         insert_ptr += k;
 857                         insert_num -= k;
 858                         child_pos = 0;
 859                 }
 860         }
 861         /* tb->lnum[h] > 0 */
 862         if (tb->rnum[h] > 0) {
 863                 /*shift rnum[h] items from S[h] to the right neighbor R[h] */
 864                 /* check how many of new items fall into R or CFR after shifting */
 865                 n = B_NR_ITEMS(tbSh);   /* number of items in S[h] */
 866                 if (n - tb->rnum[h] >= child_pos)
 867                         /* new items fall into S[h] */
 868                         /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],tb->rnum[h]); */
 869                         internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 870                                              tb->rnum[h]);
 871                 else if (n + insert_num - tb->rnum[h] < child_pos) {
 872                         /* all new items fall into R[h] */
 873                         /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],
 874                            tb->rnum[h] - insert_num); */
 875                         internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h,
 876                                              tb->rnum[h] - insert_num);
 877
 878                         /* insert insert_num keys and node-pointers into R[h] */
 879                         bi.tb = tb;
 880                         bi.bi_bh = tb->R[h];
 881                         bi.bi_parent = tb->FR[h];
 882                         bi.bi_position = get_right_neighbor_position(tb, h);
 883                         internal_insert_childs(&bi,
 884                                                /*tb->R[h],tb->S[h-1]->b_next */
 885                                                child_pos - n - insert_num +
 886                                                tb->rnum[h] - 1,
 887                                                insert_num, insert_key,
 888                                                insert_ptr);
 889                         insert_num = 0;
 890                 } else {
 891                         struct disk_child *dc;
 892
 893                         /* one of the items falls into CFR[h] */
 894                         internal_shift1_right(tb, h, n - child_pos + 1);
 895                         /* calculate number of new items that fall into R[h] */
 896                         k = tb->rnum[h] - n + child_pos - 1;
 897                         bi.tb = tb;
 898                         bi.bi_bh = tb->R[h];
 899                         bi.bi_parent = tb->FR[h];
 900                         bi.bi_position = get_right_neighbor_position(tb, h);
 901                         internal_insert_childs(&bi,
 902                                                /*tb->R[h], tb->R[h]->b_child, */
 903                                                0, k, insert_key + 1,
 904                                                insert_ptr + 1);
 905
 906                         replace_rkey(tb, h, insert_key + insert_num - k - 1);
 907
 908                         /* replace the first node-ptr in R[h] by node-ptr insert_ptr[insert_num-k-1] */
 909                         dc = B_N_CHILD(tb->R[h], 0);
 910                         put_dc_size(dc,
 911                                     MAX_CHILD_SIZE(insert_ptr
 912                                                    [insert_num - k - 1]) -
 913                                     B_FREE_SPACE(insert_ptr
 914                                                  [insert_num - k - 1]));
 915                         put_dc_block_number(dc,
 916                                             insert_ptr[insert_num - k -
 917                                                        1]->b_blocknr);
 918
 919                         do_balance_mark_internal_dirty(tb, tb->R[h], 0);
 920
 921                         insert_num -= (k + 1);
 922                 }
 923         }
 924
 925     /** Fill new node that appears instead of S[h] **/
 926         RFALSE(tb->blknum[h] > 2, "blknum can not be > 2 for internal level");
 927         RFALSE(tb->blknum[h] < 0, "blknum can not be < 0");
 928
 929         if (!tb->blknum[h]) {   /* node S[h] is empty now */
 930                 RFALSE(!tbSh, "S[h] is equal NULL");
 931
 932                 /* do what is needed for buffer thrown from tree */
 933                 reiserfs_invalidate_buffer(tb, tbSh);
 934                 return order;
 935         }
 936
 937         if (!tbSh) {
 938                 /* create new root */
 939                 struct disk_child *dc;
 940                 struct buffer_head *tbSh_1 = PATH_H_PBUFFER(tb->tb_path, h - 1);
 941                 struct block_head *blkh;
 942
 943                 if (tb->blknum[h] != 1)
 944                         reiserfs_panic(NULL,
 945                                        "balance_internal: One new node required for creating the new root");
 946                 /* S[h] = empty buffer from the list FEB. */
 947                 tbSh = get_FEB(tb);
 948                 blkh = B_BLK_HEAD(tbSh);
 949                 set_blkh_level(blkh, h + 1);
 950
 951                 /* Put the unique node-pointer to S[h] that points to S[h-1]. */
 952
 953                 dc = B_N_CHILD(tbSh, 0);
 954                 put_dc_block_number(dc, tbSh_1->b_blocknr);
 955                 put_dc_size(dc,
 956                             (MAX_CHILD_SIZE(tbSh_1) - B_FREE_SPACE(tbSh_1)));
 957
 958                 tb->insert_size[h] -= DC_SIZE;
 959                 set_blkh_free_space(blkh, blkh_free_space(blkh) - DC_SIZE);
 960
 961                 do_balance_mark_internal_dirty(tb, tbSh, 0);
 962
 963                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 964                 check_internal(tbSh);
 965                 /*&&&&&&&&&&&&&&&&&&&&&&&& */
 966
 967                 /* put new root into path structure */
 968                 PATH_OFFSET_PBUFFER(tb->tb_path, ILLEGAL_PATH_ELEMENT_OFFSET) =
 969                     tbSh;
 970
 971                 /* Change root in structure super block. */
 972                 PUT_SB_ROOT_BLOCK(tb->tb_sb, tbSh->b_blocknr);
 973                 PUT_SB_TREE_HEIGHT(tb->tb_sb, SB_TREE_HEIGHT(tb->tb_sb) + 1);
 974                 do_balance_mark_sb_dirty(tb, REISERFS_SB(tb->tb_sb)->s_sbh, 1);
 975         }
 976
 977         if (tb->blknum[h] == 2) {
 978                 int snum;
 979                 struct buffer_info dest_bi, src_bi;
 980
 981                 /* S_new = free buffer from list FEB */
 982                 S_new = get_FEB(tb);
 983
 984                 set_blkh_level(B_BLK_HEAD(S_new), h + 1);
 985
 986                 dest_bi.tb = tb;
 987                 dest_bi.bi_bh = S_new;
 988                 dest_bi.bi_parent = NULL;
 989                 dest_bi.bi_position = 0;
 990                 src_bi.tb = tb;
 991                 src_bi.bi_bh = tbSh;
 992                 src_bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
 993                 src_bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
 994
 995                 n = B_NR_ITEMS(tbSh);   /* number of items in S[h] */
 996                 snum = (insert_num + n + 1) / 2;
 997                 if (n - snum >= child_pos) {
 998                         /* new items don't fall into S_new */
 999                         /*  store the delimiting key for the next level */
1000                         /* new_insert_key = (n - snum)'th key in S[h] */
1001                         memcpy(&new_insert_key, B_N_PDELIM_KEY(tbSh, n - snum),
1002                                KEY_SIZE);
1003                         /* last parameter is del_par */
1004                         internal_move_pointers_items(&dest_bi, &src_bi,
1005                                                      LAST_TO_FIRST, snum, 0);
1006                         /*            internal_move_pointers_items(S_new, tbSh, LAST_TO_FIRST, snum, 0); */
1007                 } else if (n + insert_num - snum < child_pos) {
1008                         /* all new items fall into S_new */
1009                         /*  store the delimiting key for the next level */
1010                         /* new_insert_key = (n + insert_item - snum)'th key in S[h] */
1011                         memcpy(&new_insert_key,
1012                                B_N_PDELIM_KEY(tbSh, n + insert_num - snum),
1013                                KEY_SIZE);
1014                         /* last parameter is del_par */
1015                         internal_move_pointers_items(&dest_bi, &src_bi,
1016                                                      LAST_TO_FIRST,
1017                                                      snum - insert_num, 0);
1018                         /*                  internal_move_pointers_items(S_new,tbSh,1,snum - insert_num,0); */
1019
1020                         /* insert insert_num keys and node-pointers into S_new */
1021                         internal_insert_childs(&dest_bi,
1022                                                /*S_new,tb->S[h-1]->b_next, */
1023                                                child_pos - n - insert_num +
1024                                                snum - 1,
1025                                                insert_num, insert_key,
1026                                                insert_ptr);
1027
1028                         insert_num = 0;
1029                 } else {
1030                         struct disk_child *dc;
1031
1032                         /* some items fall into S_new, but some don't fall */
1033                         /* last parameter is del_par */
1034                         internal_move_pointers_items(&dest_bi, &src_bi,
1035                                                      LAST_TO_FIRST,
1036                                                      n - child_pos + 1, 1);
1037                         /*                  internal_move_pointers_items(S_new,tbSh,1,n - child_pos + 1,1); */
1038                         /* calculate number of new items that fall into S_new */
1039                         k = snum - n + child_pos - 1;
1040
1041                         internal_insert_childs(&dest_bi, /*S_new, */ 0, k,
1042                                                insert_key + 1, insert_ptr + 1);
1043
1044                         /* new_insert_key = insert_key[insert_num - k - 1] */
1045                         memcpy(&new_insert_key, insert_key + insert_num - k - 1,
1046                                KEY_SIZE);
1047                         /* replace first node-ptr in S_new by node-ptr to insert_ptr[insert_num-k-1] */
1048
1049                         dc = B_N_CHILD(S_new, 0);
1050                         put_dc_size(dc,
1051                                     (MAX_CHILD_SIZE
1052                                      (insert_ptr[insert_num - k - 1]) -
1053                                      B_FREE_SPACE(insert_ptr
1054                                                   [insert_num - k - 1])));
1055                         put_dc_block_number(dc,
1056                                             insert_ptr[insert_num - k -
1057                                                        1]->b_blocknr);
1058
1059                         do_balance_mark_internal_dirty(tb, S_new, 0);
1060
1061                         insert_num -= (k + 1);
1062                 }
1063                 /* new_insert_ptr = node_pointer to S_new */
1064                 new_insert_ptr = S_new;
1065
1066                 RFALSE(!buffer_journaled(S_new) || buffer_journal_dirty(S_new)
1067                        || buffer_dirty(S_new), "cm-00001: bad S_new (%b)",
1068                        S_new);
1069
1070                 // S_new is released in unfix_nodes
1071         }
1072
1073         n = B_NR_ITEMS(tbSh);   /*number of items in S[h] */
1074
1075         if (0 <= child_pos && child_pos <= n && insert_num > 0) {
1076                 bi.tb = tb;
1077                 bi.bi_bh = tbSh;
1078                 bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h);
1079                 bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1);
1080                 internal_insert_childs(&bi,     /*tbSh, */
1081                                        /*          ( tb->S[h-1]->b_parent == tb->S[h] ) ? tb->S[h-1]->b_next :  tb->S[h]->b_child->b_next, */
1082                                        child_pos, insert_num, insert_key,
1083                                        insert_ptr);
1084         }
1085
1086         memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE);
1087         insert_ptr[0] = new_insert_ptr;
1088
1089         return order;
1090 }