diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/reiserfs/ibalance.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/reiserfs/ibalance.c | 1089 |
1 files changed, 0 insertions, 1089 deletions
diff --git a/ANDROID_3.4.5/fs/reiserfs/ibalance.c b/ANDROID_3.4.5/fs/reiserfs/ibalance.c deleted file mode 100644 index e1978fd8..00000000 --- a/ANDROID_3.4.5/fs/reiserfs/ibalance.c +++ /dev/null @@ -1,1089 +0,0 @@ -/* - * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README - */ - -#include <asm/uaccess.h> -#include <linux/string.h> -#include <linux/time.h> -#include "reiserfs.h" -#include <linux/buffer_head.h> - -/* this is one and only function that is used outside (do_balance.c) */ -int balance_internal(struct tree_balance *, - int, int, struct item_head *, struct buffer_head **); - -/* modes of internal_shift_left, internal_shift_right and internal_insert_childs */ -#define INTERNAL_SHIFT_FROM_S_TO_L 0 -#define INTERNAL_SHIFT_FROM_R_TO_S 1 -#define INTERNAL_SHIFT_FROM_L_TO_S 2 -#define INTERNAL_SHIFT_FROM_S_TO_R 3 -#define INTERNAL_INSERT_TO_S 4 -#define INTERNAL_INSERT_TO_L 5 -#define INTERNAL_INSERT_TO_R 6 - -static void internal_define_dest_src_infos(int shift_mode, - struct tree_balance *tb, - int h, - struct buffer_info *dest_bi, - struct buffer_info *src_bi, - int *d_key, struct buffer_head **cf) -{ - memset(dest_bi, 0, sizeof(struct buffer_info)); - memset(src_bi, 0, sizeof(struct buffer_info)); - /* define dest, src, dest parent, dest position */ - switch (shift_mode) { - case INTERNAL_SHIFT_FROM_S_TO_L: /* used in internal_shift_left */ - src_bi->tb = tb; - src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h); - src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h); - src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); - dest_bi->tb = tb; - dest_bi->bi_bh = tb->L[h]; - dest_bi->bi_parent = tb->FL[h]; - dest_bi->bi_position = get_left_neighbor_position(tb, h); - *d_key = tb->lkey[h]; - *cf = tb->CFL[h]; - break; - case INTERNAL_SHIFT_FROM_L_TO_S: - src_bi->tb = tb; - src_bi->bi_bh = tb->L[h]; - src_bi->bi_parent = tb->FL[h]; - src_bi->bi_position = get_left_neighbor_position(tb, h); - dest_bi->tb = tb; - dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h); - dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h); - dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); /* dest position is analog of dest->b_item_order */ - *d_key = tb->lkey[h]; - *cf = tb->CFL[h]; - break; - - case INTERNAL_SHIFT_FROM_R_TO_S: /* used in internal_shift_left */ - src_bi->tb = tb; - src_bi->bi_bh = tb->R[h]; - src_bi->bi_parent = tb->FR[h]; - src_bi->bi_position = get_right_neighbor_position(tb, h); - dest_bi->tb = tb; - dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h); - dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h); - dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); - *d_key = tb->rkey[h]; - *cf = tb->CFR[h]; - break; - - case INTERNAL_SHIFT_FROM_S_TO_R: - src_bi->tb = tb; - src_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h); - src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h); - src_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); - dest_bi->tb = tb; - dest_bi->bi_bh = tb->R[h]; - dest_bi->bi_parent = tb->FR[h]; - dest_bi->bi_position = get_right_neighbor_position(tb, h); - *d_key = tb->rkey[h]; - *cf = tb->CFR[h]; - break; - - case INTERNAL_INSERT_TO_L: - dest_bi->tb = tb; - dest_bi->bi_bh = tb->L[h]; - dest_bi->bi_parent = tb->FL[h]; - dest_bi->bi_position = get_left_neighbor_position(tb, h); - break; - - case INTERNAL_INSERT_TO_S: - dest_bi->tb = tb; - dest_bi->bi_bh = PATH_H_PBUFFER(tb->tb_path, h); - dest_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, h); - dest_bi->bi_position = PATH_H_POSITION(tb->tb_path, h + 1); - break; - - case INTERNAL_INSERT_TO_R: - dest_bi->tb = tb; - dest_bi->bi_bh = tb->R[h]; - dest_bi->bi_parent = tb->FR[h]; - dest_bi->bi_position = get_right_neighbor_position(tb, h); - break; - - default: - reiserfs_panic(tb->tb_sb, "ibalance-1", - "shift type is unknown (%d)", - shift_mode); - } -} - -/* Insert count node pointers into buffer cur before position to + 1. - * Insert count items into buffer cur before position to. - * Items and node pointers are specified by inserted and bh respectively. - */ -static void internal_insert_childs(struct buffer_info *cur_bi, - int to, int count, - struct item_head *inserted, - struct buffer_head **bh) -{ - struct buffer_head *cur = cur_bi->bi_bh; - struct block_head *blkh; - int nr; - struct reiserfs_key *ih; - struct disk_child new_dc[2]; - struct disk_child *dc; - int i; - - if (count <= 0) - return; - - blkh = B_BLK_HEAD(cur); - nr = blkh_nr_item(blkh); - - RFALSE(count > 2, "too many children (%d) are to be inserted", count); - RFALSE(B_FREE_SPACE(cur) < count * (KEY_SIZE + DC_SIZE), - "no enough free space (%d), needed %d bytes", - B_FREE_SPACE(cur), count * (KEY_SIZE + DC_SIZE)); - - /* prepare space for count disk_child */ - dc = B_N_CHILD(cur, to + 1); - - memmove(dc + count, dc, (nr + 1 - (to + 1)) * DC_SIZE); - - /* copy to_be_insert disk children */ - for (i = 0; i < count; i++) { - put_dc_size(&(new_dc[i]), - MAX_CHILD_SIZE(bh[i]) - B_FREE_SPACE(bh[i])); - put_dc_block_number(&(new_dc[i]), bh[i]->b_blocknr); - } - memcpy(dc, new_dc, DC_SIZE * count); - - /* prepare space for count items */ - ih = B_N_PDELIM_KEY(cur, ((to == -1) ? 0 : to)); - - memmove(ih + count, ih, - (nr - to) * KEY_SIZE + (nr + 1 + count) * DC_SIZE); - - /* copy item headers (keys) */ - memcpy(ih, inserted, KEY_SIZE); - if (count > 1) - memcpy(ih + 1, inserted + 1, KEY_SIZE); - - /* sizes, item number */ - set_blkh_nr_item(blkh, blkh_nr_item(blkh) + count); - set_blkh_free_space(blkh, - blkh_free_space(blkh) - count * (DC_SIZE + - KEY_SIZE)); - - do_balance_mark_internal_dirty(cur_bi->tb, cur, 0); - - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - check_internal(cur); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - - if (cur_bi->bi_parent) { - struct disk_child *t_dc = - B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position); - put_dc_size(t_dc, - dc_size(t_dc) + (count * (DC_SIZE + KEY_SIZE))); - do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent, - 0); - - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - check_internal(cur_bi->bi_parent); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - } - -} - -/* Delete del_num items and node pointers from buffer cur starting from * - * the first_i'th item and first_p'th pointers respectively. */ -static void internal_delete_pointers_items(struct buffer_info *cur_bi, - int first_p, - int first_i, int del_num) -{ - struct buffer_head *cur = cur_bi->bi_bh; - int nr; - struct block_head *blkh; - struct reiserfs_key *key; - struct disk_child *dc; - - RFALSE(cur == NULL, "buffer is 0"); - RFALSE(del_num < 0, - "negative number of items (%d) can not be deleted", del_num); - RFALSE(first_p < 0 || first_p + del_num > B_NR_ITEMS(cur) + 1 - || first_i < 0, - "first pointer order (%d) < 0 or " - "no so many pointers (%d), only (%d) or " - "first key order %d < 0", first_p, first_p + del_num, - B_NR_ITEMS(cur) + 1, first_i); - if (del_num == 0) - return; - - blkh = B_BLK_HEAD(cur); - nr = blkh_nr_item(blkh); - - if (first_p == 0 && del_num == nr + 1) { - RFALSE(first_i != 0, - "1st deleted key must have order 0, not %d", first_i); - make_empty_node(cur_bi); - return; - } - - RFALSE(first_i + del_num > B_NR_ITEMS(cur), - "first_i = %d del_num = %d " - "no so many keys (%d) in the node (%b)(%z)", - first_i, del_num, first_i + del_num, cur, cur); - - /* deleting */ - dc = B_N_CHILD(cur, first_p); - - memmove(dc, dc + del_num, (nr + 1 - first_p - del_num) * DC_SIZE); - key = B_N_PDELIM_KEY(cur, first_i); - memmove(key, key + del_num, - (nr - first_i - del_num) * KEY_SIZE + (nr + 1 - - del_num) * DC_SIZE); - - /* sizes, item number */ - set_blkh_nr_item(blkh, blkh_nr_item(blkh) - del_num); - set_blkh_free_space(blkh, - blkh_free_space(blkh) + - (del_num * (KEY_SIZE + DC_SIZE))); - - do_balance_mark_internal_dirty(cur_bi->tb, cur, 0); - /*&&&&&&&&&&&&&&&&&&&&&&& */ - check_internal(cur); - /*&&&&&&&&&&&&&&&&&&&&&&& */ - - if (cur_bi->bi_parent) { - struct disk_child *t_dc; - t_dc = B_N_CHILD(cur_bi->bi_parent, cur_bi->bi_position); - put_dc_size(t_dc, - dc_size(t_dc) - (del_num * (KEY_SIZE + DC_SIZE))); - - do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent, - 0); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - check_internal(cur_bi->bi_parent); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - } -} - -/* delete n node pointers and items starting from given position */ -static void internal_delete_childs(struct buffer_info *cur_bi, int from, int n) -{ - int i_from; - - i_from = (from == 0) ? from : from - 1; - - /* delete n pointers starting from `from' position in CUR; - delete n keys starting from 'i_from' position in CUR; - */ - internal_delete_pointers_items(cur_bi, from, i_from, n); -} - -/* copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest -* last_first == FIRST_TO_LAST means, that we copy first items from src to tail of dest - * last_first == LAST_TO_FIRST means, that we copy last items from src to head of dest - */ -static void internal_copy_pointers_items(struct buffer_info *dest_bi, - struct buffer_head *src, - int last_first, int cpy_num) -{ - /* ATTENTION! Number of node pointers in DEST is equal to number of items in DEST * - * as delimiting key have already inserted to buffer dest.*/ - struct buffer_head *dest = dest_bi->bi_bh; - int nr_dest, nr_src; - int dest_order, src_order; - struct block_head *blkh; - struct reiserfs_key *key; - struct disk_child *dc; - - nr_src = B_NR_ITEMS(src); - - RFALSE(dest == NULL || src == NULL, - "src (%p) or dest (%p) buffer is 0", src, dest); - RFALSE(last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST, - "invalid last_first parameter (%d)", last_first); - RFALSE(nr_src < cpy_num - 1, - "no so many items (%d) in src (%d)", cpy_num, nr_src); - RFALSE(cpy_num < 0, "cpy_num less than 0 (%d)", cpy_num); - RFALSE(cpy_num - 1 + B_NR_ITEMS(dest) > (int)MAX_NR_KEY(dest), - "cpy_num (%d) + item number in dest (%d) can not be > MAX_NR_KEY(%d)", - cpy_num, B_NR_ITEMS(dest), MAX_NR_KEY(dest)); - - if (cpy_num == 0) - return; - - /* coping */ - blkh = B_BLK_HEAD(dest); - nr_dest = blkh_nr_item(blkh); - - /*dest_order = (last_first == LAST_TO_FIRST) ? 0 : nr_dest; */ - /*src_order = (last_first == LAST_TO_FIRST) ? (nr_src - cpy_num + 1) : 0; */ - (last_first == LAST_TO_FIRST) ? (dest_order = 0, src_order = - nr_src - cpy_num + 1) : (dest_order = - nr_dest, - src_order = - 0); - - /* prepare space for cpy_num pointers */ - dc = B_N_CHILD(dest, dest_order); - - memmove(dc + cpy_num, dc, (nr_dest - dest_order) * DC_SIZE); - - /* insert pointers */ - memcpy(dc, B_N_CHILD(src, src_order), DC_SIZE * cpy_num); - - /* prepare space for cpy_num - 1 item headers */ - key = B_N_PDELIM_KEY(dest, dest_order); - memmove(key + cpy_num - 1, key, - KEY_SIZE * (nr_dest - dest_order) + DC_SIZE * (nr_dest + - cpy_num)); - - /* insert headers */ - memcpy(key, B_N_PDELIM_KEY(src, src_order), KEY_SIZE * (cpy_num - 1)); - - /* sizes, item number */ - set_blkh_nr_item(blkh, blkh_nr_item(blkh) + (cpy_num - 1)); - set_blkh_free_space(blkh, - blkh_free_space(blkh) - (KEY_SIZE * (cpy_num - 1) + - DC_SIZE * cpy_num)); - - do_balance_mark_internal_dirty(dest_bi->tb, dest, 0); - - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - check_internal(dest); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - - if (dest_bi->bi_parent) { - struct disk_child *t_dc; - t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position); - put_dc_size(t_dc, - dc_size(t_dc) + (KEY_SIZE * (cpy_num - 1) + - DC_SIZE * cpy_num)); - - do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent, - 0); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - check_internal(dest_bi->bi_parent); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - } - -} - -/* Copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest. - * Delete cpy_num - del_par items and node pointers from buffer src. - * last_first == FIRST_TO_LAST means, that we copy/delete first items from src. - * last_first == LAST_TO_FIRST means, that we copy/delete last items from src. - */ -static void internal_move_pointers_items(struct buffer_info *dest_bi, - struct buffer_info *src_bi, - int last_first, int cpy_num, - int del_par) -{ - int first_pointer; - int first_item; - - internal_copy_pointers_items(dest_bi, src_bi->bi_bh, last_first, - cpy_num); - - if (last_first == FIRST_TO_LAST) { /* shift_left occurs */ - first_pointer = 0; - first_item = 0; - /* delete cpy_num - del_par pointers and keys starting for pointers with first_pointer, - for key - with first_item */ - internal_delete_pointers_items(src_bi, first_pointer, - first_item, cpy_num - del_par); - } else { /* shift_right occurs */ - int i, j; - - i = (cpy_num - del_par == - (j = - B_NR_ITEMS(src_bi->bi_bh)) + 1) ? 0 : j - cpy_num + - del_par; - - internal_delete_pointers_items(src_bi, - j + 1 - cpy_num + del_par, i, - cpy_num - del_par); - } -} - -/* Insert n_src'th key of buffer src before n_dest'th key of buffer dest. */ -static void internal_insert_key(struct buffer_info *dest_bi, int dest_position_before, /* insert key before key with n_dest number */ - struct buffer_head *src, int src_position) -{ - struct buffer_head *dest = dest_bi->bi_bh; - int nr; - struct block_head *blkh; - struct reiserfs_key *key; - - RFALSE(dest == NULL || src == NULL, - "source(%p) or dest(%p) buffer is 0", src, dest); - RFALSE(dest_position_before < 0 || src_position < 0, - "source(%d) or dest(%d) key number less than 0", - src_position, dest_position_before); - RFALSE(dest_position_before > B_NR_ITEMS(dest) || - src_position >= B_NR_ITEMS(src), - "invalid position in dest (%d (key number %d)) or in src (%d (key number %d))", - dest_position_before, B_NR_ITEMS(dest), - src_position, B_NR_ITEMS(src)); - RFALSE(B_FREE_SPACE(dest) < KEY_SIZE, - "no enough free space (%d) in dest buffer", B_FREE_SPACE(dest)); - - blkh = B_BLK_HEAD(dest); - nr = blkh_nr_item(blkh); - - /* prepare space for inserting key */ - key = B_N_PDELIM_KEY(dest, dest_position_before); - memmove(key + 1, key, - (nr - dest_position_before) * KEY_SIZE + (nr + 1) * DC_SIZE); - - /* insert key */ - memcpy(key, B_N_PDELIM_KEY(src, src_position), KEY_SIZE); - - /* Change dirt, free space, item number fields. */ - - set_blkh_nr_item(blkh, blkh_nr_item(blkh) + 1); - set_blkh_free_space(blkh, blkh_free_space(blkh) - KEY_SIZE); - - do_balance_mark_internal_dirty(dest_bi->tb, dest, 0); - - if (dest_bi->bi_parent) { - struct disk_child *t_dc; - t_dc = B_N_CHILD(dest_bi->bi_parent, dest_bi->bi_position); - put_dc_size(t_dc, dc_size(t_dc) + KEY_SIZE); - - do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent, - 0); - } -} - -/* Insert d_key'th (delimiting) key from buffer cfl to tail of dest. - * Copy pointer_amount node pointers and pointer_amount - 1 items from buffer src to buffer dest. - * Replace d_key'th key in buffer cfl. - * Delete pointer_amount items and node pointers from buffer src. - */ -/* this can be invoked both to shift from S to L and from R to S */ -static void internal_shift_left(int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S */ - struct tree_balance *tb, - int h, int pointer_amount) -{ - struct buffer_info dest_bi, src_bi; - struct buffer_head *cf; - int d_key_position; - - internal_define_dest_src_infos(mode, tb, h, &dest_bi, &src_bi, - &d_key_position, &cf); - - /*printk("pointer_amount = %d\n",pointer_amount); */ - - if (pointer_amount) { - /* insert delimiting key from common father of dest and src to node dest into position B_NR_ITEM(dest) */ - internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf, - d_key_position); - - if (B_NR_ITEMS(src_bi.bi_bh) == pointer_amount - 1) { - if (src_bi.bi_position /*src->b_item_order */ == 0) - replace_key(tb, cf, d_key_position, - src_bi. - bi_parent /*src->b_parent */ , 0); - } else - replace_key(tb, cf, d_key_position, src_bi.bi_bh, - pointer_amount - 1); - } - /* last parameter is del_parameter */ - internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST, - pointer_amount, 0); - -} - -/* Insert delimiting key to L[h]. - * Copy n node pointers and n - 1 items from buffer S[h] to L[h]. - * Delete n - 1 items and node pointers from buffer S[h]. - */ -/* it always shifts from S[h] to L[h] */ -static void internal_shift1_left(struct tree_balance *tb, - int h, int pointer_amount) -{ - struct buffer_info dest_bi, src_bi; - struct buffer_head *cf; - int d_key_position; - - internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, - &dest_bi, &src_bi, &d_key_position, &cf); - - if (pointer_amount > 0) /* insert lkey[h]-th key from CFL[h] to left neighbor L[h] */ - internal_insert_key(&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf, - d_key_position); - /* internal_insert_key (tb->L[h], B_NR_ITEM(tb->L[h]), tb->CFL[h], tb->lkey[h]); */ - - /* last parameter is del_parameter */ - internal_move_pointers_items(&dest_bi, &src_bi, FIRST_TO_LAST, - pointer_amount, 1); - /* internal_move_pointers_items (tb->L[h], tb->S[h], FIRST_TO_LAST, pointer_amount, 1); */ -} - -/* Insert d_key'th (delimiting) key from buffer cfr to head of dest. - * Copy n node pointers and n - 1 items from buffer src to buffer dest. - * Replace d_key'th key in buffer cfr. - * Delete n items and node pointers from buffer src. - */ -static void internal_shift_right(int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S */ - struct tree_balance *tb, - int h, int pointer_amount) -{ - struct buffer_info dest_bi, src_bi; - struct buffer_head *cf; - int d_key_position; - int nr; - - internal_define_dest_src_infos(mode, tb, h, &dest_bi, &src_bi, - &d_key_position, &cf); - - nr = B_NR_ITEMS(src_bi.bi_bh); - - if (pointer_amount > 0) { - /* insert delimiting key from common father of dest and src to dest node into position 0 */ - internal_insert_key(&dest_bi, 0, cf, d_key_position); - if (nr == pointer_amount - 1) { - RFALSE(src_bi.bi_bh != PATH_H_PBUFFER(tb->tb_path, h) /*tb->S[h] */ || - dest_bi.bi_bh != tb->R[h], - "src (%p) must be == tb->S[h](%p) when it disappears", - src_bi.bi_bh, PATH_H_PBUFFER(tb->tb_path, h)); - /* when S[h] disappers replace left delemiting key as well */ - if (tb->CFL[h]) - replace_key(tb, cf, d_key_position, tb->CFL[h], - tb->lkey[h]); - } else - replace_key(tb, cf, d_key_position, src_bi.bi_bh, - nr - pointer_amount); - } - - /* last parameter is del_parameter */ - internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST, - pointer_amount, 0); -} - -/* Insert delimiting key to R[h]. - * Copy n node pointers and n - 1 items from buffer S[h] to R[h]. - * Delete n - 1 items and node pointers from buffer S[h]. - */ -/* it always shift from S[h] to R[h] */ -static void internal_shift1_right(struct tree_balance *tb, - int h, int pointer_amount) -{ - struct buffer_info dest_bi, src_bi; - struct buffer_head *cf; - int d_key_position; - - internal_define_dest_src_infos(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, - &dest_bi, &src_bi, &d_key_position, &cf); - - if (pointer_amount > 0) /* insert rkey from CFR[h] to right neighbor R[h] */ - internal_insert_key(&dest_bi, 0, cf, d_key_position); - /* internal_insert_key (tb->R[h], 0, tb->CFR[h], tb->rkey[h]); */ - - /* last parameter is del_parameter */ - internal_move_pointers_items(&dest_bi, &src_bi, LAST_TO_FIRST, - pointer_amount, 1); - /* internal_move_pointers_items (tb->R[h], tb->S[h], LAST_TO_FIRST, pointer_amount, 1); */ -} - -/* Delete insert_num node pointers together with their left items - * and balance current node.*/ -static void balance_internal_when_delete(struct tree_balance *tb, - int h, int child_pos) -{ - int insert_num; - int n; - struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h); - struct buffer_info bi; - - insert_num = tb->insert_size[h] / ((int)(DC_SIZE + KEY_SIZE)); - - /* delete child-node-pointer(s) together with their left item(s) */ - bi.tb = tb; - bi.bi_bh = tbSh; - bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h); - bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1); - - internal_delete_childs(&bi, child_pos, -insert_num); - - RFALSE(tb->blknum[h] > 1, - "tb->blknum[%d]=%d when insert_size < 0", h, tb->blknum[h]); - - n = B_NR_ITEMS(tbSh); - - if (tb->lnum[h] == 0 && tb->rnum[h] == 0) { - if (tb->blknum[h] == 0) { - /* node S[h] (root of the tree) is empty now */ - struct buffer_head *new_root; - - RFALSE(n - || B_FREE_SPACE(tbSh) != - MAX_CHILD_SIZE(tbSh) - DC_SIZE, - "buffer must have only 0 keys (%d)", n); - RFALSE(bi.bi_parent, "root has parent (%p)", - bi.bi_parent); - - /* choose a new root */ - if (!tb->L[h - 1] || !B_NR_ITEMS(tb->L[h - 1])) - new_root = tb->R[h - 1]; - else - new_root = tb->L[h - 1]; - /* switch super block's tree root block number to the new value */ - PUT_SB_ROOT_BLOCK(tb->tb_sb, new_root->b_blocknr); - //REISERFS_SB(tb->tb_sb)->s_rs->s_tree_height --; - PUT_SB_TREE_HEIGHT(tb->tb_sb, - SB_TREE_HEIGHT(tb->tb_sb) - 1); - - do_balance_mark_sb_dirty(tb, - REISERFS_SB(tb->tb_sb)->s_sbh, - 1); - /*&&&&&&&&&&&&&&&&&&&&&& */ - if (h > 1) - /* use check_internal if new root is an internal node */ - check_internal(new_root); - /*&&&&&&&&&&&&&&&&&&&&&& */ - - /* do what is needed for buffer thrown from tree */ - reiserfs_invalidate_buffer(tb, tbSh); - return; - } - return; - } - - if (tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1) { /* join S[h] with L[h] */ - - RFALSE(tb->rnum[h] != 0, - "invalid tb->rnum[%d]==%d when joining S[h] with L[h]", - h, tb->rnum[h]); - - internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, n + 1); - reiserfs_invalidate_buffer(tb, tbSh); - - return; - } - - if (tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1) { /* join S[h] with R[h] */ - RFALSE(tb->lnum[h] != 0, - "invalid tb->lnum[%d]==%d when joining S[h] with R[h]", - h, tb->lnum[h]); - - internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, n + 1); - - reiserfs_invalidate_buffer(tb, tbSh); - return; - } - - if (tb->lnum[h] < 0) { /* borrow from left neighbor L[h] */ - RFALSE(tb->rnum[h] != 0, - "wrong tb->rnum[%d]==%d when borrow from L[h]", h, - tb->rnum[h]); - /*internal_shift_right (tb, h, tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], -tb->lnum[h]); */ - internal_shift_right(INTERNAL_SHIFT_FROM_L_TO_S, tb, h, - -tb->lnum[h]); - return; - } - - if (tb->rnum[h] < 0) { /* borrow from right neighbor R[h] */ - RFALSE(tb->lnum[h] != 0, - "invalid tb->lnum[%d]==%d when borrow from R[h]", - h, tb->lnum[h]); - 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]); */ - return; - } - - if (tb->lnum[h] > 0) { /* split S[h] into two parts and put them into neighbors */ - RFALSE(tb->rnum[h] == 0 || tb->lnum[h] + tb->rnum[h] != n + 1, - "invalid tb->lnum[%d]==%d or tb->rnum[%d]==%d when S[h](item number == %d) is split between them", - h, tb->lnum[h], h, tb->rnum[h], n); - - 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]); */ - internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, - tb->rnum[h]); - - reiserfs_invalidate_buffer(tb, tbSh); - - return; - } - reiserfs_panic(tb->tb_sb, "ibalance-2", - "unexpected tb->lnum[%d]==%d or tb->rnum[%d]==%d", - h, tb->lnum[h], h, tb->rnum[h]); -} - -/* Replace delimiting key of buffers L[h] and S[h] by the given key.*/ -static void replace_lkey(struct tree_balance *tb, int h, struct item_head *key) -{ - RFALSE(tb->L[h] == NULL || tb->CFL[h] == NULL, - "L[h](%p) and CFL[h](%p) must exist in replace_lkey", - tb->L[h], tb->CFL[h]); - - if (B_NR_ITEMS(PATH_H_PBUFFER(tb->tb_path, h)) == 0) - return; - - memcpy(B_N_PDELIM_KEY(tb->CFL[h], tb->lkey[h]), key, KEY_SIZE); - - do_balance_mark_internal_dirty(tb, tb->CFL[h], 0); -} - -/* Replace delimiting key of buffers S[h] and R[h] by the given key.*/ -static void replace_rkey(struct tree_balance *tb, int h, struct item_head *key) -{ - RFALSE(tb->R[h] == NULL || tb->CFR[h] == NULL, - "R[h](%p) and CFR[h](%p) must exist in replace_rkey", - tb->R[h], tb->CFR[h]); - RFALSE(B_NR_ITEMS(tb->R[h]) == 0, - "R[h] can not be empty if it exists (item number=%d)", - B_NR_ITEMS(tb->R[h])); - - memcpy(B_N_PDELIM_KEY(tb->CFR[h], tb->rkey[h]), key, KEY_SIZE); - - do_balance_mark_internal_dirty(tb, tb->CFR[h], 0); -} - -int balance_internal(struct tree_balance *tb, /* tree_balance structure */ - int h, /* level of the tree */ - int child_pos, struct item_head *insert_key, /* key for insertion on higher level */ - struct buffer_head **insert_ptr /* node for insertion on higher level */ - ) - /* if inserting/pasting - { - child_pos is the position of the node-pointer in S[h] that * - pointed to S[h-1] before balancing of the h-1 level; * - this means that new pointers and items must be inserted AFTER * - child_pos - } - else - { - it is the position of the leftmost pointer that must be deleted (together with - its corresponding key to the left of the pointer) - as a result of the previous level's balancing. - } - */ -{ - struct buffer_head *tbSh = PATH_H_PBUFFER(tb->tb_path, h); - struct buffer_info bi; - int order; /* we return this: it is 0 if there is no S[h], else it is tb->S[h]->b_item_order */ - int insert_num, n, k; - struct buffer_head *S_new; - struct item_head new_insert_key; - struct buffer_head *new_insert_ptr = NULL; - struct item_head *new_insert_key_addr = insert_key; - - RFALSE(h < 1, "h (%d) can not be < 1 on internal level", h); - - PROC_INFO_INC(tb->tb_sb, balance_at[h]); - - order = - (tbSh) ? PATH_H_POSITION(tb->tb_path, - h + 1) /*tb->S[h]->b_item_order */ : 0; - - /* Using insert_size[h] calculate the number insert_num of items - that must be inserted to or deleted from S[h]. */ - insert_num = tb->insert_size[h] / ((int)(KEY_SIZE + DC_SIZE)); - - /* Check whether insert_num is proper * */ - RFALSE(insert_num < -2 || insert_num > 2, - "incorrect number of items inserted to the internal node (%d)", - insert_num); - RFALSE(h > 1 && (insert_num > 1 || insert_num < -1), - "incorrect number of items (%d) inserted to the internal node on a level (h=%d) higher than last internal level", - insert_num, h); - - /* Make balance in case insert_num < 0 */ - if (insert_num < 0) { - balance_internal_when_delete(tb, h, child_pos); - return order; - } - - k = 0; - if (tb->lnum[h] > 0) { - /* shift lnum[h] items from S[h] to the left neighbor L[h]. - check how many of new items fall into L[h] or CFL[h] after - shifting */ - n = B_NR_ITEMS(tb->L[h]); /* number of items in L[h] */ - if (tb->lnum[h] <= child_pos) { - /* new items don't fall into L[h] or CFL[h] */ - internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, - tb->lnum[h]); - /*internal_shift_left (tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,tb->lnum[h]); */ - child_pos -= tb->lnum[h]; - } else if (tb->lnum[h] > child_pos + insert_num) { - /* all new items fall into L[h] */ - internal_shift_left(INTERNAL_SHIFT_FROM_S_TO_L, tb, h, - tb->lnum[h] - insert_num); - /* internal_shift_left(tb->L[h],tb->CFL[h],tb->lkey[h],tbSh, - tb->lnum[h]-insert_num); - */ - /* insert insert_num keys and node-pointers into L[h] */ - bi.tb = tb; - bi.bi_bh = tb->L[h]; - bi.bi_parent = tb->FL[h]; - bi.bi_position = get_left_neighbor_position(tb, h); - internal_insert_childs(&bi, - /*tb->L[h], tb->S[h-1]->b_next */ - n + child_pos + 1, - insert_num, insert_key, - insert_ptr); - - insert_num = 0; - } else { - struct disk_child *dc; - - /* some items fall into L[h] or CFL[h], but some don't fall */ - internal_shift1_left(tb, h, child_pos + 1); - /* calculate number of new items that fall into L[h] */ - k = tb->lnum[h] - child_pos - 1; - bi.tb = tb; - bi.bi_bh = tb->L[h]; - bi.bi_parent = tb->FL[h]; - bi.bi_position = get_left_neighbor_position(tb, h); - internal_insert_childs(&bi, - /*tb->L[h], tb->S[h-1]->b_next, */ - n + child_pos + 1, k, - insert_key, insert_ptr); - - replace_lkey(tb, h, insert_key + k); - - /* replace the first node-ptr in S[h] by node-ptr to insert_ptr[k] */ - dc = B_N_CHILD(tbSh, 0); - put_dc_size(dc, - MAX_CHILD_SIZE(insert_ptr[k]) - - B_FREE_SPACE(insert_ptr[k])); - put_dc_block_number(dc, insert_ptr[k]->b_blocknr); - - do_balance_mark_internal_dirty(tb, tbSh, 0); - - k++; - insert_key += k; - insert_ptr += k; - insert_num -= k; - child_pos = 0; - } - } - /* tb->lnum[h] > 0 */ - if (tb->rnum[h] > 0) { - /*shift rnum[h] items from S[h] to the right neighbor R[h] */ - /* check how many of new items fall into R or CFR after shifting */ - n = B_NR_ITEMS(tbSh); /* number of items in S[h] */ - if (n - tb->rnum[h] >= child_pos) - /* new items fall into S[h] */ - /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],tb->rnum[h]); */ - internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, - tb->rnum[h]); - else if (n + insert_num - tb->rnum[h] < child_pos) { - /* all new items fall into R[h] */ - /*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h], - tb->rnum[h] - insert_num); */ - internal_shift_right(INTERNAL_SHIFT_FROM_S_TO_R, tb, h, - tb->rnum[h] - insert_num); - - /* insert insert_num keys and node-pointers into R[h] */ - bi.tb = tb; - bi.bi_bh = tb->R[h]; - bi.bi_parent = tb->FR[h]; - bi.bi_position = get_right_neighbor_position(tb, h); - internal_insert_childs(&bi, - /*tb->R[h],tb->S[h-1]->b_next */ - child_pos - n - insert_num + - tb->rnum[h] - 1, - insert_num, insert_key, - insert_ptr); - insert_num = 0; - } else { - struct disk_child *dc; - - /* one of the items falls into CFR[h] */ - internal_shift1_right(tb, h, n - child_pos + 1); - /* calculate number of new items that fall into R[h] */ - k = tb->rnum[h] - n + child_pos - 1; - bi.tb = tb; - bi.bi_bh = tb->R[h]; - bi.bi_parent = tb->FR[h]; - bi.bi_position = get_right_neighbor_position(tb, h); - internal_insert_childs(&bi, - /*tb->R[h], tb->R[h]->b_child, */ - 0, k, insert_key + 1, - insert_ptr + 1); - - replace_rkey(tb, h, insert_key + insert_num - k - 1); - - /* replace the first node-ptr in R[h] by node-ptr insert_ptr[insert_num-k-1] */ - dc = B_N_CHILD(tb->R[h], 0); - put_dc_size(dc, - MAX_CHILD_SIZE(insert_ptr - [insert_num - k - 1]) - - B_FREE_SPACE(insert_ptr - [insert_num - k - 1])); - put_dc_block_number(dc, - insert_ptr[insert_num - k - - 1]->b_blocknr); - - do_balance_mark_internal_dirty(tb, tb->R[h], 0); - - insert_num -= (k + 1); - } - } - - /** Fill new node that appears instead of S[h] **/ - RFALSE(tb->blknum[h] > 2, "blknum can not be > 2 for internal level"); - RFALSE(tb->blknum[h] < 0, "blknum can not be < 0"); - - if (!tb->blknum[h]) { /* node S[h] is empty now */ - RFALSE(!tbSh, "S[h] is equal NULL"); - - /* do what is needed for buffer thrown from tree */ - reiserfs_invalidate_buffer(tb, tbSh); - return order; - } - - if (!tbSh) { - /* create new root */ - struct disk_child *dc; - struct buffer_head *tbSh_1 = PATH_H_PBUFFER(tb->tb_path, h - 1); - struct block_head *blkh; - - if (tb->blknum[h] != 1) - reiserfs_panic(NULL, "ibalance-3", "One new node " - "required for creating the new root"); - /* S[h] = empty buffer from the list FEB. */ - tbSh = get_FEB(tb); - blkh = B_BLK_HEAD(tbSh); - set_blkh_level(blkh, h + 1); - - /* Put the unique node-pointer to S[h] that points to S[h-1]. */ - - dc = B_N_CHILD(tbSh, 0); - put_dc_block_number(dc, tbSh_1->b_blocknr); - put_dc_size(dc, - (MAX_CHILD_SIZE(tbSh_1) - B_FREE_SPACE(tbSh_1))); - - tb->insert_size[h] -= DC_SIZE; - set_blkh_free_space(blkh, blkh_free_space(blkh) - DC_SIZE); - - do_balance_mark_internal_dirty(tb, tbSh, 0); - - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - check_internal(tbSh); - /*&&&&&&&&&&&&&&&&&&&&&&&& */ - - /* put new root into path structure */ - PATH_OFFSET_PBUFFER(tb->tb_path, ILLEGAL_PATH_ELEMENT_OFFSET) = - tbSh; - - /* Change root in structure super block. */ - PUT_SB_ROOT_BLOCK(tb->tb_sb, tbSh->b_blocknr); - PUT_SB_TREE_HEIGHT(tb->tb_sb, SB_TREE_HEIGHT(tb->tb_sb) + 1); - do_balance_mark_sb_dirty(tb, REISERFS_SB(tb->tb_sb)->s_sbh, 1); - } - - if (tb->blknum[h] == 2) { - int snum; - struct buffer_info dest_bi, src_bi; - - /* S_new = free buffer from list FEB */ - S_new = get_FEB(tb); - - set_blkh_level(B_BLK_HEAD(S_new), h + 1); - - dest_bi.tb = tb; - dest_bi.bi_bh = S_new; - dest_bi.bi_parent = NULL; - dest_bi.bi_position = 0; - src_bi.tb = tb; - src_bi.bi_bh = tbSh; - src_bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h); - src_bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1); - - n = B_NR_ITEMS(tbSh); /* number of items in S[h] */ - snum = (insert_num + n + 1) / 2; - if (n - snum >= child_pos) { - /* new items don't fall into S_new */ - /* store the delimiting key for the next level */ - /* new_insert_key = (n - snum)'th key in S[h] */ - memcpy(&new_insert_key, B_N_PDELIM_KEY(tbSh, n - snum), - KEY_SIZE); - /* last parameter is del_par */ - internal_move_pointers_items(&dest_bi, &src_bi, - LAST_TO_FIRST, snum, 0); - /* internal_move_pointers_items(S_new, tbSh, LAST_TO_FIRST, snum, 0); */ - } else if (n + insert_num - snum < child_pos) { - /* all new items fall into S_new */ - /* store the delimiting key for the next level */ - /* new_insert_key = (n + insert_item - snum)'th key in S[h] */ - memcpy(&new_insert_key, - B_N_PDELIM_KEY(tbSh, n + insert_num - snum), - KEY_SIZE); - /* last parameter is del_par */ - internal_move_pointers_items(&dest_bi, &src_bi, - LAST_TO_FIRST, - snum - insert_num, 0); - /* internal_move_pointers_items(S_new,tbSh,1,snum - insert_num,0); */ - - /* insert insert_num keys and node-pointers into S_new */ - internal_insert_childs(&dest_bi, - /*S_new,tb->S[h-1]->b_next, */ - child_pos - n - insert_num + - snum - 1, - insert_num, insert_key, - insert_ptr); - - insert_num = 0; - } else { - struct disk_child *dc; - - /* some items fall into S_new, but some don't fall */ - /* last parameter is del_par */ - internal_move_pointers_items(&dest_bi, &src_bi, - LAST_TO_FIRST, - n - child_pos + 1, 1); - /* internal_move_pointers_items(S_new,tbSh,1,n - child_pos + 1,1); */ - /* calculate number of new items that fall into S_new */ - k = snum - n + child_pos - 1; - - internal_insert_childs(&dest_bi, /*S_new, */ 0, k, - insert_key + 1, insert_ptr + 1); - - /* new_insert_key = insert_key[insert_num - k - 1] */ - memcpy(&new_insert_key, insert_key + insert_num - k - 1, - KEY_SIZE); - /* replace first node-ptr in S_new by node-ptr to insert_ptr[insert_num-k-1] */ - - dc = B_N_CHILD(S_new, 0); - put_dc_size(dc, - (MAX_CHILD_SIZE - (insert_ptr[insert_num - k - 1]) - - B_FREE_SPACE(insert_ptr - [insert_num - k - 1]))); - put_dc_block_number(dc, - insert_ptr[insert_num - k - - 1]->b_blocknr); - - do_balance_mark_internal_dirty(tb, S_new, 0); - - insert_num -= (k + 1); - } - /* new_insert_ptr = node_pointer to S_new */ - new_insert_ptr = S_new; - - RFALSE(!buffer_journaled(S_new) || buffer_journal_dirty(S_new) - || buffer_dirty(S_new), "cm-00001: bad S_new (%b)", - S_new); - - // S_new is released in unfix_nodes - } - - n = B_NR_ITEMS(tbSh); /*number of items in S[h] */ - - if (0 <= child_pos && child_pos <= n && insert_num > 0) { - bi.tb = tb; - bi.bi_bh = tbSh; - bi.bi_parent = PATH_H_PPARENT(tb->tb_path, h); - bi.bi_position = PATH_H_POSITION(tb->tb_path, h + 1); - internal_insert_childs(&bi, /*tbSh, */ - /* ( tb->S[h-1]->b_parent == tb->S[h] ) ? tb->S[h-1]->b_next : tb->S[h]->b_child->b_next, */ - child_pos, insert_num, insert_key, - insert_ptr); - } - - memcpy(new_insert_key_addr, &new_insert_key, KEY_SIZE); - insert_ptr[0] = new_insert_ptr; - - return order; -} |