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1275 |
phoenix |
/*
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* Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README
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*/
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#include <linux/config.h>
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#include <asm/uaccess.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/reiserfs_fs.h>
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/* this is one and only function that is used outside (do_balance.c) */
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int balance_internal (
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struct tree_balance * ,
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int,
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int,
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struct item_head * ,
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struct buffer_head **
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);
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/* modes of internal_shift_left, internal_shift_right and internal_insert_childs */
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#define INTERNAL_SHIFT_FROM_S_TO_L 0
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#define INTERNAL_SHIFT_FROM_R_TO_S 1
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#define INTERNAL_SHIFT_FROM_L_TO_S 2
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#define INTERNAL_SHIFT_FROM_S_TO_R 3
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#define INTERNAL_INSERT_TO_S 4
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#define INTERNAL_INSERT_TO_L 5
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#define INTERNAL_INSERT_TO_R 6
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static void internal_define_dest_src_infos (
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int shift_mode,
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struct tree_balance * tb,
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int h,
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struct buffer_info * dest_bi,
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struct buffer_info * src_bi,
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int * d_key,
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struct buffer_head ** cf
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)
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{
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memset (dest_bi, 0, sizeof (struct buffer_info));
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memset (src_bi, 0, sizeof (struct buffer_info));
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/* define dest, src, dest parent, dest position */
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switch (shift_mode) {
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case INTERNAL_SHIFT_FROM_S_TO_L: /* used in internal_shift_left */
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src_bi->tb = tb;
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src_bi->bi_bh = PATH_H_PBUFFER (tb->tb_path, h);
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src_bi->bi_parent = PATH_H_PPARENT (tb->tb_path, h);
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src_bi->bi_position = PATH_H_POSITION (tb->tb_path, h + 1);
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dest_bi->tb = tb;
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dest_bi->bi_bh = tb->L[h];
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dest_bi->bi_parent = tb->FL[h];
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dest_bi->bi_position = get_left_neighbor_position (tb, h);
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*d_key = tb->lkey[h];
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*cf = tb->CFL[h];
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break;
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case INTERNAL_SHIFT_FROM_L_TO_S:
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src_bi->tb = tb;
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src_bi->bi_bh = tb->L[h];
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src_bi->bi_parent = tb->FL[h];
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src_bi->bi_position = get_left_neighbor_position (tb, h);
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dest_bi->tb = tb;
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dest_bi->bi_bh = PATH_H_PBUFFER (tb->tb_path, h);
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dest_bi->bi_parent = PATH_H_PPARENT (tb->tb_path, h);
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dest_bi->bi_position = PATH_H_POSITION (tb->tb_path, h + 1); /* dest position is analog of dest->b_item_order */
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*d_key = tb->lkey[h];
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*cf = tb->CFL[h];
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break;
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case INTERNAL_SHIFT_FROM_R_TO_S: /* used in internal_shift_left */
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src_bi->tb = tb;
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src_bi->bi_bh = tb->R[h];
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src_bi->bi_parent = tb->FR[h];
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src_bi->bi_position = get_right_neighbor_position (tb, h);
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dest_bi->tb = tb;
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dest_bi->bi_bh = PATH_H_PBUFFER (tb->tb_path, h);
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dest_bi->bi_parent = PATH_H_PPARENT (tb->tb_path, h);
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dest_bi->bi_position = PATH_H_POSITION (tb->tb_path, h + 1);
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*d_key = tb->rkey[h];
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*cf = tb->CFR[h];
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break;
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case INTERNAL_SHIFT_FROM_S_TO_R:
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src_bi->tb = tb;
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src_bi->bi_bh = PATH_H_PBUFFER (tb->tb_path, h);
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src_bi->bi_parent = PATH_H_PPARENT (tb->tb_path, h);
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src_bi->bi_position = PATH_H_POSITION (tb->tb_path, h + 1);
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dest_bi->tb = tb;
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dest_bi->bi_bh = tb->R[h];
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dest_bi->bi_parent = tb->FR[h];
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dest_bi->bi_position = get_right_neighbor_position (tb, h);
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*d_key = tb->rkey[h];
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*cf = tb->CFR[h];
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break;
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case INTERNAL_INSERT_TO_L:
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dest_bi->tb = tb;
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dest_bi->bi_bh = tb->L[h];
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dest_bi->bi_parent = tb->FL[h];
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dest_bi->bi_position = get_left_neighbor_position (tb, h);
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break;
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case INTERNAL_INSERT_TO_S:
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dest_bi->tb = tb;
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dest_bi->bi_bh = PATH_H_PBUFFER (tb->tb_path, h);
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dest_bi->bi_parent = PATH_H_PPARENT (tb->tb_path, h);
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dest_bi->bi_position = PATH_H_POSITION (tb->tb_path, h + 1);
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break;
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case INTERNAL_INSERT_TO_R:
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dest_bi->tb = tb;
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dest_bi->bi_bh = tb->R[h];
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dest_bi->bi_parent = tb->FR[h];
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dest_bi->bi_position = get_right_neighbor_position (tb, h);
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break;
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default:
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reiserfs_panic (tb->tb_sb, "internal_define_dest_src_infos: shift type is unknown (%d)", shift_mode);
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}
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}
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/* Insert count node pointers into buffer cur before position to + 1.
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* Insert count items into buffer cur before position to.
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* Items and node pointers are specified by inserted and bh respectively.
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*/
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static void internal_insert_childs (struct buffer_info * cur_bi,
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int to, int count,
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struct item_head * inserted,
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struct buffer_head ** bh
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)
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{
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struct buffer_head * cur = cur_bi->bi_bh;
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struct block_head * blkh;
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int nr;
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struct key * ih;
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struct disk_child new_dc[2];
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struct disk_child * dc;
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int i;
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if (count <= 0)
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return;
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blkh = B_BLK_HEAD(cur);
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nr = blkh_nr_item(blkh);
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RFALSE( count > 2,
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"too many children (%d) are to be inserted", count);
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RFALSE( B_FREE_SPACE (cur) < count * (KEY_SIZE + DC_SIZE),
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"no enough free space (%d), needed %d bytes",
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B_FREE_SPACE (cur), count * (KEY_SIZE + DC_SIZE));
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/* prepare space for count disk_child */
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dc = B_N_CHILD(cur,to+1);
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memmove (dc + count, dc, (nr+1-(to+1)) * DC_SIZE);
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/* copy to_be_insert disk children */
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for (i = 0; i < count; i ++) {
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put_dc_size( &(new_dc[i]), MAX_CHILD_SIZE(bh[i]) - B_FREE_SPACE(bh[i]));
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put_dc_block_number( &(new_dc[i]), bh[i]->b_blocknr );
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}
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memcpy (dc, new_dc, DC_SIZE * count);
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/* prepare space for count items */
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ih = B_N_PDELIM_KEY (cur, ((to == -1) ? 0 : to));
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memmove (ih + count, ih, (nr - to) * KEY_SIZE + (nr + 1 + count) * DC_SIZE);
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/* copy item headers (keys) */
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memcpy (ih, inserted, KEY_SIZE);
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if ( count > 1 )
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memcpy (ih + 1, inserted + 1, KEY_SIZE);
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/* sizes, item number */
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set_blkh_nr_item( blkh, blkh_nr_item(blkh) + count );
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set_blkh_free_space( blkh,
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blkh_free_space(blkh) - count * (DC_SIZE + KEY_SIZE ) );
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do_balance_mark_internal_dirty (cur_bi->tb, cur,0);
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/*&&&&&&&&&&&&&&&&&&&&&&&&*/
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check_internal (cur);
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/*&&&&&&&&&&&&&&&&&&&&&&&&*/
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if (cur_bi->bi_parent) {
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struct disk_child *t_dc = B_N_CHILD (cur_bi->bi_parent,cur_bi->bi_position);
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put_dc_size( t_dc, dc_size(t_dc) + (count * (DC_SIZE + KEY_SIZE)));
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do_balance_mark_internal_dirty(cur_bi->tb, cur_bi->bi_parent, 0);
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/*&&&&&&&&&&&&&&&&&&&&&&&&*/
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check_internal (cur_bi->bi_parent);
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/*&&&&&&&&&&&&&&&&&&&&&&&&*/
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}
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}
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/* Delete del_num items and node pointers from buffer cur starting from *
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* the first_i'th item and first_p'th pointers respectively. */
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static void internal_delete_pointers_items (
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struct buffer_info * cur_bi,
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int first_p,
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int first_i,
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int del_num
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)
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{
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struct buffer_head * cur = cur_bi->bi_bh;
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int nr;
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struct block_head * blkh;
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struct key * key;
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struct disk_child * dc;
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RFALSE( cur == NULL, "buffer is 0");
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RFALSE( del_num < 0,
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"negative number of items (%d) can not be deleted", del_num);
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RFALSE( first_p < 0 || first_p + del_num > B_NR_ITEMS (cur) + 1 || first_i < 0,
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"first pointer order (%d) < 0 or "
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"no so many pointers (%d), only (%d) or "
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"first key order %d < 0", first_p,
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first_p + del_num, B_NR_ITEMS (cur) + 1, first_i);
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if ( del_num == 0 )
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return;
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blkh = B_BLK_HEAD(cur);
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nr = blkh_nr_item(blkh);
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228 |
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if ( first_p == 0 && del_num == nr + 1 ) {
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RFALSE( first_i != 0, "1st deleted key must have order 0, not %d", first_i);
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make_empty_node (cur_bi);
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return;
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}
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RFALSE( first_i + del_num > B_NR_ITEMS (cur),
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"first_i = %d del_num = %d "
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"no so many keys (%d) in the node (%b)(%z)",
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first_i, del_num, first_i + del_num, cur, cur);
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/* deleting */
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dc = B_N_CHILD (cur, first_p);
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memmove (dc, dc + del_num, (nr + 1 - first_p - del_num) * DC_SIZE);
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key = B_N_PDELIM_KEY (cur, first_i);
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memmove (key, key + del_num, (nr - first_i - del_num) * KEY_SIZE + (nr + 1 - del_num) * DC_SIZE);
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247 |
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248 |
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/* sizes, item number */
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set_blkh_nr_item( blkh, blkh_nr_item(blkh) - del_num );
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250 |
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set_blkh_free_space( blkh,
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blkh_free_space(blkh) + (del_num * (KEY_SIZE + DC_SIZE) ) );
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253 |
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do_balance_mark_internal_dirty (cur_bi->tb, cur, 0);
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/*&&&&&&&&&&&&&&&&&&&&&&&*/
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check_internal (cur);
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256 |
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/*&&&&&&&&&&&&&&&&&&&&&&&*/
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257 |
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258 |
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if (cur_bi->bi_parent) {
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259 |
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struct disk_child *t_dc;
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t_dc = B_N_CHILD (cur_bi->bi_parent, cur_bi->bi_position);
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put_dc_size( t_dc, dc_size(t_dc) - (del_num * (KEY_SIZE + DC_SIZE) ) );
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262 |
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263 |
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do_balance_mark_internal_dirty (cur_bi->tb, cur_bi->bi_parent,0);
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264 |
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/*&&&&&&&&&&&&&&&&&&&&&&&&*/
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265 |
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check_internal (cur_bi->bi_parent);
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266 |
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/*&&&&&&&&&&&&&&&&&&&&&&&&*/
|
267 |
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}
|
268 |
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}
|
269 |
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|
270 |
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|
271 |
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/* delete n node pointers and items starting from given position */
|
272 |
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static void internal_delete_childs (struct buffer_info * cur_bi,
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273 |
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int from, int n)
|
274 |
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{
|
275 |
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int i_from;
|
276 |
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|
277 |
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i_from = (from == 0) ? from : from - 1;
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278 |
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279 |
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/* delete n pointers starting from `from' position in CUR;
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280 |
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delete n keys starting from 'i_from' position in CUR;
|
281 |
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*/
|
282 |
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internal_delete_pointers_items (cur_bi, from, i_from, n);
|
283 |
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}
|
284 |
|
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|
285 |
|
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|
286 |
|
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/* copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest
|
287 |
|
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* last_first == FIRST_TO_LAST means, that we copy first items from src to tail of dest
|
288 |
|
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* last_first == LAST_TO_FIRST means, that we copy last items from src to head of dest
|
289 |
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*/
|
290 |
|
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static void internal_copy_pointers_items (
|
291 |
|
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struct buffer_info * dest_bi,
|
292 |
|
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struct buffer_head * src,
|
293 |
|
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int last_first, int cpy_num
|
294 |
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)
|
295 |
|
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{
|
296 |
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/* ATTENTION! Number of node pointers in DEST is equal to number of items in DEST *
|
297 |
|
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* as delimiting key have already inserted to buffer dest.*/
|
298 |
|
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struct buffer_head * dest = dest_bi->bi_bh;
|
299 |
|
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int nr_dest, nr_src;
|
300 |
|
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int dest_order, src_order;
|
301 |
|
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struct block_head * blkh;
|
302 |
|
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struct key * key;
|
303 |
|
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struct disk_child * dc;
|
304 |
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|
305 |
|
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nr_src = B_NR_ITEMS (src);
|
306 |
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|
307 |
|
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RFALSE( dest == NULL || src == NULL,
|
308 |
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"src (%p) or dest (%p) buffer is 0", src, dest);
|
309 |
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RFALSE( last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST,
|
310 |
|
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"invalid last_first parameter (%d)", last_first);
|
311 |
|
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RFALSE( nr_src < cpy_num - 1,
|
312 |
|
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"no so many items (%d) in src (%d)", cpy_num, nr_src);
|
313 |
|
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RFALSE( cpy_num < 0, "cpy_num less than 0 (%d)", cpy_num);
|
314 |
|
|
RFALSE( cpy_num - 1 + B_NR_ITEMS(dest) > (int)MAX_NR_KEY(dest),
|
315 |
|
|
"cpy_num (%d) + item number in dest (%d) can not be > MAX_NR_KEY(%d)",
|
316 |
|
|
cpy_num, B_NR_ITEMS(dest), MAX_NR_KEY(dest));
|
317 |
|
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|
318 |
|
|
if ( cpy_num == 0 )
|
319 |
|
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return;
|
320 |
|
|
|
321 |
|
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/* coping */
|
322 |
|
|
blkh = B_BLK_HEAD(dest);
|
323 |
|
|
nr_dest = blkh_nr_item(blkh);
|
324 |
|
|
|
325 |
|
|
/*dest_order = (last_first == LAST_TO_FIRST) ? 0 : nr_dest;*/
|
326 |
|
|
/*src_order = (last_first == LAST_TO_FIRST) ? (nr_src - cpy_num + 1) : 0;*/
|
327 |
|
|
(last_first == LAST_TO_FIRST) ? (dest_order = 0, src_order = nr_src - cpy_num + 1) :
|
328 |
|
|
(dest_order = nr_dest, src_order = 0);
|
329 |
|
|
|
330 |
|
|
/* prepare space for cpy_num pointers */
|
331 |
|
|
dc = B_N_CHILD (dest, dest_order);
|
332 |
|
|
|
333 |
|
|
memmove (dc + cpy_num, dc, (nr_dest - dest_order) * DC_SIZE);
|
334 |
|
|
|
335 |
|
|
/* insert pointers */
|
336 |
|
|
memcpy (dc, B_N_CHILD (src, src_order), DC_SIZE * cpy_num);
|
337 |
|
|
|
338 |
|
|
|
339 |
|
|
/* prepare space for cpy_num - 1 item headers */
|
340 |
|
|
key = B_N_PDELIM_KEY(dest, dest_order);
|
341 |
|
|
memmove (key + cpy_num - 1, key,
|
342 |
|
|
KEY_SIZE * (nr_dest - dest_order) + DC_SIZE * (nr_dest + cpy_num));
|
343 |
|
|
|
344 |
|
|
|
345 |
|
|
/* insert headers */
|
346 |
|
|
memcpy (key, B_N_PDELIM_KEY (src, src_order), KEY_SIZE * (cpy_num - 1));
|
347 |
|
|
|
348 |
|
|
/* sizes, item number */
|
349 |
|
|
set_blkh_nr_item( blkh, blkh_nr_item(blkh) + (cpy_num - 1 ) );
|
350 |
|
|
set_blkh_free_space( blkh,
|
351 |
|
|
blkh_free_space(blkh) - (KEY_SIZE * (cpy_num - 1) + DC_SIZE * cpy_num ) );
|
352 |
|
|
|
353 |
|
|
do_balance_mark_internal_dirty (dest_bi->tb, dest, 0);
|
354 |
|
|
|
355 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&&&*/
|
356 |
|
|
check_internal (dest);
|
357 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&&&*/
|
358 |
|
|
|
359 |
|
|
if (dest_bi->bi_parent) {
|
360 |
|
|
struct disk_child *t_dc;
|
361 |
|
|
t_dc = B_N_CHILD(dest_bi->bi_parent,dest_bi->bi_position);
|
362 |
|
|
put_dc_size( t_dc, dc_size(t_dc) + (KEY_SIZE * (cpy_num - 1) + DC_SIZE * cpy_num) );
|
363 |
|
|
|
364 |
|
|
do_balance_mark_internal_dirty (dest_bi->tb, dest_bi->bi_parent,0);
|
365 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&&&*/
|
366 |
|
|
check_internal (dest_bi->bi_parent);
|
367 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&&&*/
|
368 |
|
|
}
|
369 |
|
|
|
370 |
|
|
}
|
371 |
|
|
|
372 |
|
|
|
373 |
|
|
/* Copy cpy_num node pointers and cpy_num - 1 items from buffer src to buffer dest.
|
374 |
|
|
* Delete cpy_num - del_par items and node pointers from buffer src.
|
375 |
|
|
* last_first == FIRST_TO_LAST means, that we copy/delete first items from src.
|
376 |
|
|
* last_first == LAST_TO_FIRST means, that we copy/delete last items from src.
|
377 |
|
|
*/
|
378 |
|
|
static void internal_move_pointers_items (struct buffer_info * dest_bi,
|
379 |
|
|
struct buffer_info * src_bi,
|
380 |
|
|
int last_first, int cpy_num, int del_par)
|
381 |
|
|
{
|
382 |
|
|
int first_pointer;
|
383 |
|
|
int first_item;
|
384 |
|
|
|
385 |
|
|
internal_copy_pointers_items (dest_bi, src_bi->bi_bh, last_first, cpy_num);
|
386 |
|
|
|
387 |
|
|
if (last_first == FIRST_TO_LAST) { /* shift_left occurs */
|
388 |
|
|
first_pointer = 0;
|
389 |
|
|
first_item = 0;
|
390 |
|
|
/* delete cpy_num - del_par pointers and keys starting for pointers with first_pointer,
|
391 |
|
|
for key - with first_item */
|
392 |
|
|
internal_delete_pointers_items (src_bi, first_pointer, first_item, cpy_num - del_par);
|
393 |
|
|
} else { /* shift_right occurs */
|
394 |
|
|
int i, j;
|
395 |
|
|
|
396 |
|
|
i = ( cpy_num - del_par == ( j = B_NR_ITEMS(src_bi->bi_bh)) + 1 ) ? 0 : j - cpy_num + del_par;
|
397 |
|
|
|
398 |
|
|
internal_delete_pointers_items (src_bi, j + 1 - cpy_num + del_par, i, cpy_num - del_par);
|
399 |
|
|
}
|
400 |
|
|
}
|
401 |
|
|
|
402 |
|
|
/* Insert n_src'th key of buffer src before n_dest'th key of buffer dest. */
|
403 |
|
|
static void internal_insert_key (struct buffer_info * dest_bi,
|
404 |
|
|
int dest_position_before, /* insert key before key with n_dest number */
|
405 |
|
|
struct buffer_head * src,
|
406 |
|
|
int src_position)
|
407 |
|
|
{
|
408 |
|
|
struct buffer_head * dest = dest_bi->bi_bh;
|
409 |
|
|
int nr;
|
410 |
|
|
struct block_head * blkh;
|
411 |
|
|
struct key * key;
|
412 |
|
|
|
413 |
|
|
RFALSE( dest == NULL || src == NULL,
|
414 |
|
|
"source(%p) or dest(%p) buffer is 0", src, dest);
|
415 |
|
|
RFALSE( dest_position_before < 0 || src_position < 0,
|
416 |
|
|
"source(%d) or dest(%d) key number less than 0",
|
417 |
|
|
src_position, dest_position_before);
|
418 |
|
|
RFALSE( dest_position_before > B_NR_ITEMS (dest) ||
|
419 |
|
|
src_position >= B_NR_ITEMS(src),
|
420 |
|
|
"invalid position in dest (%d (key number %d)) or in src (%d (key number %d))",
|
421 |
|
|
dest_position_before, B_NR_ITEMS (dest),
|
422 |
|
|
src_position, B_NR_ITEMS(src));
|
423 |
|
|
RFALSE( B_FREE_SPACE (dest) < KEY_SIZE,
|
424 |
|
|
"no enough free space (%d) in dest buffer", B_FREE_SPACE (dest));
|
425 |
|
|
|
426 |
|
|
blkh = B_BLK_HEAD(dest);
|
427 |
|
|
nr = blkh_nr_item(blkh);
|
428 |
|
|
|
429 |
|
|
/* prepare space for inserting key */
|
430 |
|
|
key = B_N_PDELIM_KEY (dest, dest_position_before);
|
431 |
|
|
memmove (key + 1, key, (nr - dest_position_before) * KEY_SIZE + (nr + 1) * DC_SIZE);
|
432 |
|
|
|
433 |
|
|
/* insert key */
|
434 |
|
|
memcpy (key, B_N_PDELIM_KEY(src, src_position), KEY_SIZE);
|
435 |
|
|
|
436 |
|
|
/* Change dirt, free space, item number fields. */
|
437 |
|
|
|
438 |
|
|
set_blkh_nr_item( blkh, blkh_nr_item(blkh) + 1 );
|
439 |
|
|
set_blkh_free_space( blkh, blkh_free_space(blkh) - KEY_SIZE );
|
440 |
|
|
|
441 |
|
|
do_balance_mark_internal_dirty (dest_bi->tb, dest, 0);
|
442 |
|
|
|
443 |
|
|
if (dest_bi->bi_parent) {
|
444 |
|
|
struct disk_child *t_dc;
|
445 |
|
|
t_dc = B_N_CHILD(dest_bi->bi_parent,dest_bi->bi_position);
|
446 |
|
|
put_dc_size( t_dc, dc_size(t_dc) + KEY_SIZE );
|
447 |
|
|
|
448 |
|
|
do_balance_mark_internal_dirty (dest_bi->tb, dest_bi->bi_parent,0);
|
449 |
|
|
}
|
450 |
|
|
}
|
451 |
|
|
|
452 |
|
|
|
453 |
|
|
|
454 |
|
|
/* Insert d_key'th (delimiting) key from buffer cfl to tail of dest.
|
455 |
|
|
* Copy pointer_amount node pointers and pointer_amount - 1 items from buffer src to buffer dest.
|
456 |
|
|
* Replace d_key'th key in buffer cfl.
|
457 |
|
|
* Delete pointer_amount items and node pointers from buffer src.
|
458 |
|
|
*/
|
459 |
|
|
/* this can be invoked both to shift from S to L and from R to S */
|
460 |
|
|
static void internal_shift_left (
|
461 |
|
|
int mode, /* INTERNAL_FROM_S_TO_L | INTERNAL_FROM_R_TO_S */
|
462 |
|
|
struct tree_balance * tb,
|
463 |
|
|
int h,
|
464 |
|
|
int pointer_amount
|
465 |
|
|
)
|
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, &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, d_key_position);
|
478 |
|
|
|
479 |
|
|
if (B_NR_ITEMS(src_bi.bi_bh) == pointer_amount - 1) {
|
480 |
|
|
if (src_bi.bi_position/*src->b_item_order*/ == 0)
|
481 |
|
|
replace_key (tb, cf, d_key_position, src_bi.bi_parent/*src->b_parent*/, 0);
|
482 |
|
|
} else
|
483 |
|
|
replace_key (tb, cf, d_key_position, src_bi.bi_bh, pointer_amount - 1);
|
484 |
|
|
}
|
485 |
|
|
/* last parameter is del_parameter */
|
486 |
|
|
internal_move_pointers_items (&dest_bi, &src_bi, FIRST_TO_LAST, pointer_amount, 0);
|
487 |
|
|
|
488 |
|
|
}
|
489 |
|
|
|
490 |
|
|
/* Insert delimiting key to L[h].
|
491 |
|
|
* Copy n node pointers and n - 1 items from buffer S[h] to L[h].
|
492 |
|
|
* Delete n - 1 items and node pointers from buffer S[h].
|
493 |
|
|
*/
|
494 |
|
|
/* it always shifts from S[h] to L[h] */
|
495 |
|
|
static void internal_shift1_left (
|
496 |
|
|
struct tree_balance * tb,
|
497 |
|
|
int h,
|
498 |
|
|
int pointer_amount
|
499 |
|
|
)
|
500 |
|
|
{
|
501 |
|
|
struct buffer_info dest_bi, src_bi;
|
502 |
|
|
struct buffer_head * cf;
|
503 |
|
|
int d_key_position;
|
504 |
|
|
|
505 |
|
|
internal_define_dest_src_infos (INTERNAL_SHIFT_FROM_S_TO_L, tb, h, &dest_bi, &src_bi, &d_key_position, &cf);
|
506 |
|
|
|
507 |
|
|
if ( pointer_amount > 0 ) /* insert lkey[h]-th key from CFL[h] to left neighbor L[h] */
|
508 |
|
|
internal_insert_key (&dest_bi, B_NR_ITEMS(dest_bi.bi_bh), cf, d_key_position);
|
509 |
|
|
/* internal_insert_key (tb->L[h], B_NR_ITEM(tb->L[h]), tb->CFL[h], tb->lkey[h]);*/
|
510 |
|
|
|
511 |
|
|
/* last parameter is del_parameter */
|
512 |
|
|
internal_move_pointers_items (&dest_bi, &src_bi, FIRST_TO_LAST, pointer_amount, 1);
|
513 |
|
|
/* internal_move_pointers_items (tb->L[h], tb->S[h], FIRST_TO_LAST, pointer_amount, 1);*/
|
514 |
|
|
}
|
515 |
|
|
|
516 |
|
|
|
517 |
|
|
/* Insert d_key'th (delimiting) key from buffer cfr to head of dest.
|
518 |
|
|
* Copy n node pointers and n - 1 items from buffer src to buffer dest.
|
519 |
|
|
* Replace d_key'th key in buffer cfr.
|
520 |
|
|
* Delete n items and node pointers from buffer src.
|
521 |
|
|
*/
|
522 |
|
|
static void internal_shift_right (
|
523 |
|
|
int mode, /* INTERNAL_FROM_S_TO_R | INTERNAL_FROM_L_TO_S */
|
524 |
|
|
struct tree_balance * tb,
|
525 |
|
|
int h,
|
526 |
|
|
int pointer_amount
|
527 |
|
|
)
|
528 |
|
|
{
|
529 |
|
|
struct buffer_info dest_bi, src_bi;
|
530 |
|
|
struct buffer_head * cf;
|
531 |
|
|
int d_key_position;
|
532 |
|
|
int nr;
|
533 |
|
|
|
534 |
|
|
|
535 |
|
|
internal_define_dest_src_infos (mode, tb, h, &dest_bi, &src_bi, &d_key_position, &cf);
|
536 |
|
|
|
537 |
|
|
nr = B_NR_ITEMS (src_bi.bi_bh);
|
538 |
|
|
|
539 |
|
|
if (pointer_amount > 0) {
|
540 |
|
|
/* insert delimiting key from common father of dest and src to dest node into position 0 */
|
541 |
|
|
internal_insert_key (&dest_bi, 0, cf, d_key_position);
|
542 |
|
|
if (nr == pointer_amount - 1) {
|
543 |
|
|
RFALSE( src_bi.bi_bh != PATH_H_PBUFFER (tb->tb_path, h)/*tb->S[h]*/ ||
|
544 |
|
|
dest_bi.bi_bh != tb->R[h],
|
545 |
|
|
"src (%p) must be == tb->S[h](%p) when it disappears",
|
546 |
|
|
src_bi.bi_bh, PATH_H_PBUFFER (tb->tb_path, h));
|
547 |
|
|
/* when S[h] disappers replace left delemiting key as well */
|
548 |
|
|
if (tb->CFL[h])
|
549 |
|
|
replace_key (tb, cf, d_key_position, tb->CFL[h], tb->lkey[h]);
|
550 |
|
|
} else
|
551 |
|
|
replace_key (tb, cf, d_key_position, src_bi.bi_bh, nr - pointer_amount);
|
552 |
|
|
}
|
553 |
|
|
|
554 |
|
|
/* last parameter is del_parameter */
|
555 |
|
|
internal_move_pointers_items (&dest_bi, &src_bi, LAST_TO_FIRST, pointer_amount, 0);
|
556 |
|
|
}
|
557 |
|
|
|
558 |
|
|
/* Insert delimiting key to R[h].
|
559 |
|
|
* Copy n node pointers and n - 1 items from buffer S[h] to R[h].
|
560 |
|
|
* Delete n - 1 items and node pointers from buffer S[h].
|
561 |
|
|
*/
|
562 |
|
|
/* it always shift from S[h] to R[h] */
|
563 |
|
|
static void internal_shift1_right (
|
564 |
|
|
struct tree_balance * tb,
|
565 |
|
|
int h,
|
566 |
|
|
int pointer_amount
|
567 |
|
|
)
|
568 |
|
|
{
|
569 |
|
|
struct buffer_info dest_bi, src_bi;
|
570 |
|
|
struct buffer_head * cf;
|
571 |
|
|
int d_key_position;
|
572 |
|
|
|
573 |
|
|
internal_define_dest_src_infos (INTERNAL_SHIFT_FROM_S_TO_R, tb, h, &dest_bi, &src_bi, &d_key_position, &cf);
|
574 |
|
|
|
575 |
|
|
if (pointer_amount > 0) /* insert rkey from CFR[h] to right neighbor R[h] */
|
576 |
|
|
internal_insert_key (&dest_bi, 0, cf, d_key_position);
|
577 |
|
|
/* internal_insert_key (tb->R[h], 0, tb->CFR[h], tb->rkey[h]);*/
|
578 |
|
|
|
579 |
|
|
/* last parameter is del_parameter */
|
580 |
|
|
internal_move_pointers_items (&dest_bi, &src_bi, LAST_TO_FIRST, pointer_amount, 1);
|
581 |
|
|
/* internal_move_pointers_items (tb->R[h], tb->S[h], LAST_TO_FIRST, pointer_amount, 1);*/
|
582 |
|
|
}
|
583 |
|
|
|
584 |
|
|
|
585 |
|
|
/* Delete insert_num node pointers together with their left items
|
586 |
|
|
* and balance current node.*/
|
587 |
|
|
static void balance_internal_when_delete (struct tree_balance * tb,
|
588 |
|
|
int h, int child_pos)
|
589 |
|
|
{
|
590 |
|
|
int insert_num;
|
591 |
|
|
int n;
|
592 |
|
|
struct buffer_head * tbSh = PATH_H_PBUFFER (tb->tb_path, h);
|
593 |
|
|
struct buffer_info bi;
|
594 |
|
|
|
595 |
|
|
insert_num = tb->insert_size[h] / ((int)(DC_SIZE + KEY_SIZE));
|
596 |
|
|
|
597 |
|
|
/* delete child-node-pointer(s) together with their left item(s) */
|
598 |
|
|
bi.tb = tb;
|
599 |
|
|
bi.bi_bh = tbSh;
|
600 |
|
|
bi.bi_parent = PATH_H_PPARENT (tb->tb_path, h);
|
601 |
|
|
bi.bi_position = PATH_H_POSITION (tb->tb_path, h + 1);
|
602 |
|
|
|
603 |
|
|
internal_delete_childs (&bi, child_pos, -insert_num);
|
604 |
|
|
|
605 |
|
|
RFALSE( tb->blknum[h] > 1,
|
606 |
|
|
"tb->blknum[%d]=%d when insert_size < 0", h, tb->blknum[h]);
|
607 |
|
|
|
608 |
|
|
n = B_NR_ITEMS(tbSh);
|
609 |
|
|
|
610 |
|
|
if ( tb->lnum[h] == 0 && tb->rnum[h] == 0 ) {
|
611 |
|
|
if ( tb->blknum[h] == 0 ) {
|
612 |
|
|
/* node S[h] (root of the tree) is empty now */
|
613 |
|
|
struct buffer_head *new_root;
|
614 |
|
|
|
615 |
|
|
RFALSE( n || B_FREE_SPACE (tbSh) != MAX_CHILD_SIZE(tbSh) - DC_SIZE,
|
616 |
|
|
"buffer must have only 0 keys (%d)", n);
|
617 |
|
|
RFALSE( bi.bi_parent, "root has parent (%p)", bi.bi_parent);
|
618 |
|
|
|
619 |
|
|
/* choose a new root */
|
620 |
|
|
if ( ! tb->L[h-1] || ! B_NR_ITEMS(tb->L[h-1]) )
|
621 |
|
|
new_root = tb->R[h-1];
|
622 |
|
|
else
|
623 |
|
|
new_root = tb->L[h-1];
|
624 |
|
|
/* switch super block's tree root block number to the new value */
|
625 |
|
|
PUT_SB_ROOT_BLOCK( tb->tb_sb, new_root->b_blocknr );
|
626 |
|
|
//tb->tb_sb->u.reiserfs_sb.s_rs->s_tree_height --;
|
627 |
|
|
PUT_SB_TREE_HEIGHT( tb->tb_sb, SB_TREE_HEIGHT(tb->tb_sb) - 1 );
|
628 |
|
|
|
629 |
|
|
do_balance_mark_sb_dirty (tb, tb->tb_sb->u.reiserfs_sb.s_sbh, 1);
|
630 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&*/
|
631 |
|
|
if (h > 1)
|
632 |
|
|
/* use check_internal if new root is an internal node */
|
633 |
|
|
check_internal (new_root);
|
634 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&*/
|
635 |
|
|
tb->tb_sb->s_dirt = 1;
|
636 |
|
|
|
637 |
|
|
/* do what is needed for buffer thrown from tree */
|
638 |
|
|
reiserfs_invalidate_buffer(tb, tbSh);
|
639 |
|
|
return;
|
640 |
|
|
}
|
641 |
|
|
return;
|
642 |
|
|
}
|
643 |
|
|
|
644 |
|
|
if ( tb->L[h] && tb->lnum[h] == -B_NR_ITEMS(tb->L[h]) - 1 ) { /* join S[h] with L[h] */
|
645 |
|
|
|
646 |
|
|
RFALSE( tb->rnum[h] != 0,
|
647 |
|
|
"invalid tb->rnum[%d]==%d when joining S[h] with L[h]",
|
648 |
|
|
h, tb->rnum[h]);
|
649 |
|
|
|
650 |
|
|
internal_shift_left (INTERNAL_SHIFT_FROM_S_TO_L, tb, h, n + 1);
|
651 |
|
|
reiserfs_invalidate_buffer(tb, tbSh);
|
652 |
|
|
|
653 |
|
|
return;
|
654 |
|
|
}
|
655 |
|
|
|
656 |
|
|
if ( tb->R[h] && tb->rnum[h] == -B_NR_ITEMS(tb->R[h]) - 1 ) { /* join S[h] with R[h] */
|
657 |
|
|
RFALSE( tb->lnum[h] != 0,
|
658 |
|
|
"invalid tb->lnum[%d]==%d when joining S[h] with R[h]",
|
659 |
|
|
h, tb->lnum[h]);
|
660 |
|
|
|
661 |
|
|
internal_shift_right (INTERNAL_SHIFT_FROM_S_TO_R, tb, h, n + 1);
|
662 |
|
|
|
663 |
|
|
reiserfs_invalidate_buffer(tb,tbSh);
|
664 |
|
|
return;
|
665 |
|
|
}
|
666 |
|
|
|
667 |
|
|
if ( tb->lnum[h] < 0 ) { /* borrow from left neighbor L[h] */
|
668 |
|
|
RFALSE( tb->rnum[h] != 0,
|
669 |
|
|
"wrong tb->rnum[%d]==%d when borrow from L[h]", h, tb->rnum[h]);
|
670 |
|
|
/*internal_shift_right (tb, h, tb->L[h], tb->CFL[h], tb->lkey[h], tb->S[h], -tb->lnum[h]);*/
|
671 |
|
|
internal_shift_right (INTERNAL_SHIFT_FROM_L_TO_S, tb, h, -tb->lnum[h]);
|
672 |
|
|
return;
|
673 |
|
|
}
|
674 |
|
|
|
675 |
|
|
if ( tb->rnum[h] < 0 ) { /* borrow from right neighbor R[h] */
|
676 |
|
|
RFALSE( tb->lnum[h] != 0,
|
677 |
|
|
"invalid tb->lnum[%d]==%d when borrow from R[h]",
|
678 |
|
|
h, tb->lnum[h]);
|
679 |
|
|
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]);*/
|
680 |
|
|
return;
|
681 |
|
|
}
|
682 |
|
|
|
683 |
|
|
if ( tb->lnum[h] > 0 ) { /* split S[h] into two parts and put them into neighbors */
|
684 |
|
|
RFALSE( tb->rnum[h] == 0 || tb->lnum[h] + tb->rnum[h] != n + 1,
|
685 |
|
|
"invalid tb->lnum[%d]==%d or tb->rnum[%d]==%d when S[h](item number == %d) is split between them",
|
686 |
|
|
h, tb->lnum[h], h, tb->rnum[h], n);
|
687 |
|
|
|
688 |
|
|
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]);*/
|
689 |
|
|
internal_shift_right (INTERNAL_SHIFT_FROM_S_TO_R, tb, h, tb->rnum[h]);
|
690 |
|
|
|
691 |
|
|
reiserfs_invalidate_buffer (tb, tbSh);
|
692 |
|
|
|
693 |
|
|
return;
|
694 |
|
|
}
|
695 |
|
|
reiserfs_panic (tb->tb_sb, "balance_internal_when_delete: unexpected tb->lnum[%d]==%d or tb->rnum[%d]==%d",
|
696 |
|
|
h, tb->lnum[h], h, tb->rnum[h]);
|
697 |
|
|
}
|
698 |
|
|
|
699 |
|
|
|
700 |
|
|
/* Replace delimiting key of buffers L[h] and S[h] by the given key.*/
|
701 |
|
|
void replace_lkey (
|
702 |
|
|
struct tree_balance * tb,
|
703 |
|
|
int h,
|
704 |
|
|
struct item_head * key
|
705 |
|
|
)
|
706 |
|
|
{
|
707 |
|
|
RFALSE( tb->L[h] == NULL || tb->CFL[h] == NULL,
|
708 |
|
|
"L[h](%p) and CFL[h](%p) must exist in replace_lkey",
|
709 |
|
|
tb->L[h], tb->CFL[h]);
|
710 |
|
|
|
711 |
|
|
if (B_NR_ITEMS(PATH_H_PBUFFER(tb->tb_path, h)) == 0)
|
712 |
|
|
return;
|
713 |
|
|
|
714 |
|
|
memcpy (B_N_PDELIM_KEY(tb->CFL[h],tb->lkey[h]), key, KEY_SIZE);
|
715 |
|
|
|
716 |
|
|
do_balance_mark_internal_dirty (tb, tb->CFL[h],0);
|
717 |
|
|
}
|
718 |
|
|
|
719 |
|
|
|
720 |
|
|
/* Replace delimiting key of buffers S[h] and R[h] by the given key.*/
|
721 |
|
|
void replace_rkey (
|
722 |
|
|
struct tree_balance * tb,
|
723 |
|
|
int h,
|
724 |
|
|
struct item_head * key
|
725 |
|
|
)
|
726 |
|
|
{
|
727 |
|
|
RFALSE( tb->R[h] == NULL || tb->CFR[h] == NULL,
|
728 |
|
|
"R[h](%p) and CFR[h](%p) must exist in replace_rkey",
|
729 |
|
|
tb->R[h], tb->CFR[h]);
|
730 |
|
|
RFALSE( B_NR_ITEMS(tb->R[h]) == 0,
|
731 |
|
|
"R[h] can not be empty if it exists (item number=%d)",
|
732 |
|
|
B_NR_ITEMS(tb->R[h]));
|
733 |
|
|
|
734 |
|
|
memcpy (B_N_PDELIM_KEY(tb->CFR[h],tb->rkey[h]), key, KEY_SIZE);
|
735 |
|
|
|
736 |
|
|
do_balance_mark_internal_dirty (tb, tb->CFR[h], 0);
|
737 |
|
|
}
|
738 |
|
|
|
739 |
|
|
|
740 |
|
|
int balance_internal (struct tree_balance * tb, /* tree_balance structure */
|
741 |
|
|
int h, /* level of the tree */
|
742 |
|
|
int child_pos,
|
743 |
|
|
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 = ( tbSh ) ? PATH_H_POSITION (tb->tb_path, h + 1)/*tb->S[h]->b_item_order*/ : 0;
|
775 |
|
|
|
776 |
|
|
/* Using insert_size[h] calculate the number insert_num of items
|
777 |
|
|
that must be inserted to or deleted from S[h]. */
|
778 |
|
|
insert_num = tb->insert_size[h]/((int)(KEY_SIZE + DC_SIZE));
|
779 |
|
|
|
780 |
|
|
/* Check whether insert_num is proper **/
|
781 |
|
|
RFALSE( insert_num < -2 || insert_num > 2,
|
782 |
|
|
"incorrect number of items inserted to the internal node (%d)",
|
783 |
|
|
insert_num);
|
784 |
|
|
RFALSE( h > 1 && (insert_num > 1 || insert_num < -1),
|
785 |
|
|
"incorrect number of items (%d) inserted to the internal node on a level (h=%d) higher than last internal level",
|
786 |
|
|
insert_num, h);
|
787 |
|
|
|
788 |
|
|
/* Make balance in case insert_num < 0 */
|
789 |
|
|
if ( insert_num < 0 ) {
|
790 |
|
|
balance_internal_when_delete (tb, h, child_pos);
|
791 |
|
|
return order;
|
792 |
|
|
}
|
793 |
|
|
|
794 |
|
|
k = 0;
|
795 |
|
|
if ( tb->lnum[h] > 0 ) {
|
796 |
|
|
/* shift lnum[h] items from S[h] to the left neighbor L[h].
|
797 |
|
|
check how many of new items fall into L[h] or CFL[h] after
|
798 |
|
|
shifting */
|
799 |
|
|
n = B_NR_ITEMS (tb->L[h]); /* number of items in L[h] */
|
800 |
|
|
if ( tb->lnum[h] <= child_pos ) {
|
801 |
|
|
/* new items don't fall into L[h] or CFL[h] */
|
802 |
|
|
internal_shift_left (INTERNAL_SHIFT_FROM_S_TO_L, tb, h, tb->lnum[h]);
|
803 |
|
|
/*internal_shift_left (tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,tb->lnum[h]);*/
|
804 |
|
|
child_pos -= tb->lnum[h];
|
805 |
|
|
} else if ( tb->lnum[h] > child_pos + insert_num ) {
|
806 |
|
|
/* all new items fall into L[h] */
|
807 |
|
|
internal_shift_left (INTERNAL_SHIFT_FROM_S_TO_L, tb, h, tb->lnum[h] - insert_num);
|
808 |
|
|
/* internal_shift_left(tb->L[h],tb->CFL[h],tb->lkey[h],tbSh,
|
809 |
|
|
tb->lnum[h]-insert_num);
|
810 |
|
|
*/
|
811 |
|
|
/* insert insert_num keys and node-pointers into L[h] */
|
812 |
|
|
bi.tb = tb;
|
813 |
|
|
bi.bi_bh = tb->L[h];
|
814 |
|
|
bi.bi_parent = tb->FL[h];
|
815 |
|
|
bi.bi_position = get_left_neighbor_position (tb, h);
|
816 |
|
|
internal_insert_childs (&bi,/*tb->L[h], tb->S[h-1]->b_next*/ n + child_pos + 1,
|
817 |
|
|
insert_num,insert_key,insert_ptr);
|
818 |
|
|
|
819 |
|
|
insert_num = 0;
|
820 |
|
|
} else {
|
821 |
|
|
struct disk_child * dc;
|
822 |
|
|
|
823 |
|
|
/* some items fall into L[h] or CFL[h], but some don't fall */
|
824 |
|
|
internal_shift1_left(tb,h,child_pos+1);
|
825 |
|
|
/* calculate number of new items that fall into L[h] */
|
826 |
|
|
k = tb->lnum[h] - child_pos - 1;
|
827 |
|
|
bi.tb = tb;
|
828 |
|
|
bi.bi_bh = tb->L[h];
|
829 |
|
|
bi.bi_parent = tb->FL[h];
|
830 |
|
|
bi.bi_position = get_left_neighbor_position (tb, h);
|
831 |
|
|
internal_insert_childs (&bi,/*tb->L[h], tb->S[h-1]->b_next,*/ n + child_pos + 1,k,
|
832 |
|
|
insert_key,insert_ptr);
|
833 |
|
|
|
834 |
|
|
replace_lkey(tb,h,insert_key + k);
|
835 |
|
|
|
836 |
|
|
/* replace the first node-ptr in S[h] by node-ptr to insert_ptr[k] */
|
837 |
|
|
dc = B_N_CHILD(tbSh, 0);
|
838 |
|
|
put_dc_size( dc, MAX_CHILD_SIZE(insert_ptr[k]) - B_FREE_SPACE (insert_ptr[k]));
|
839 |
|
|
put_dc_block_number( dc, insert_ptr[k]->b_blocknr );
|
840 |
|
|
|
841 |
|
|
do_balance_mark_internal_dirty (tb, tbSh, 0);
|
842 |
|
|
|
843 |
|
|
k++;
|
844 |
|
|
insert_key += k;
|
845 |
|
|
insert_ptr += k;
|
846 |
|
|
insert_num -= k;
|
847 |
|
|
child_pos = 0;
|
848 |
|
|
}
|
849 |
|
|
} /* tb->lnum[h] > 0 */
|
850 |
|
|
|
851 |
|
|
if ( tb->rnum[h] > 0 ) {
|
852 |
|
|
/*shift rnum[h] items from S[h] to the right neighbor R[h]*/
|
853 |
|
|
/* check how many of new items fall into R or CFR after shifting */
|
854 |
|
|
n = B_NR_ITEMS (tbSh); /* number of items in S[h] */
|
855 |
|
|
if ( n - tb->rnum[h] >= child_pos )
|
856 |
|
|
/* new items fall into S[h] */
|
857 |
|
|
/*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],tb->rnum[h]);*/
|
858 |
|
|
internal_shift_right (INTERNAL_SHIFT_FROM_S_TO_R, tb, h, tb->rnum[h]);
|
859 |
|
|
else
|
860 |
|
|
if ( n + insert_num - tb->rnum[h] < child_pos )
|
861 |
|
|
{
|
862 |
|
|
/* all new items fall into R[h] */
|
863 |
|
|
/*internal_shift_right(tb,h,tbSh,tb->CFR[h],tb->rkey[h],tb->R[h],
|
864 |
|
|
tb->rnum[h] - insert_num);*/
|
865 |
|
|
internal_shift_right (INTERNAL_SHIFT_FROM_S_TO_R, tb, h, tb->rnum[h] - insert_num);
|
866 |
|
|
|
867 |
|
|
/* insert insert_num keys and node-pointers into R[h] */
|
868 |
|
|
bi.tb = tb;
|
869 |
|
|
bi.bi_bh = tb->R[h];
|
870 |
|
|
bi.bi_parent = tb->FR[h];
|
871 |
|
|
bi.bi_position = get_right_neighbor_position (tb, h);
|
872 |
|
|
internal_insert_childs (&bi, /*tb->R[h],tb->S[h-1]->b_next*/ child_pos - n - insert_num + tb->rnum[h] - 1,
|
873 |
|
|
insert_num,insert_key,insert_ptr);
|
874 |
|
|
insert_num = 0;
|
875 |
|
|
}
|
876 |
|
|
else
|
877 |
|
|
{
|
878 |
|
|
struct disk_child * dc;
|
879 |
|
|
|
880 |
|
|
/* one of the items falls into CFR[h] */
|
881 |
|
|
internal_shift1_right(tb,h,n - child_pos + 1);
|
882 |
|
|
/* calculate number of new items that fall into R[h] */
|
883 |
|
|
k = tb->rnum[h] - n + child_pos - 1;
|
884 |
|
|
bi.tb = tb;
|
885 |
|
|
bi.bi_bh = tb->R[h];
|
886 |
|
|
bi.bi_parent = tb->FR[h];
|
887 |
|
|
bi.bi_position = get_right_neighbor_position (tb, h);
|
888 |
|
|
internal_insert_childs (&bi, /*tb->R[h], tb->R[h]->b_child,*/ 0, k, insert_key + 1, insert_ptr + 1);
|
889 |
|
|
|
890 |
|
|
replace_rkey(tb,h,insert_key + insert_num - k - 1);
|
891 |
|
|
|
892 |
|
|
/* replace the first node-ptr in R[h] by node-ptr insert_ptr[insert_num-k-1]*/
|
893 |
|
|
dc = B_N_CHILD(tb->R[h], 0);
|
894 |
|
|
put_dc_size( dc, MAX_CHILD_SIZE(insert_ptr[insert_num-k-1]) -
|
895 |
|
|
B_FREE_SPACE (insert_ptr[insert_num-k-1]));
|
896 |
|
|
put_dc_block_number( dc, insert_ptr[insert_num-k-1]->b_blocknr );
|
897 |
|
|
|
898 |
|
|
do_balance_mark_internal_dirty (tb, tb->R[h],0);
|
899 |
|
|
|
900 |
|
|
insert_num -= (k + 1);
|
901 |
|
|
}
|
902 |
|
|
}
|
903 |
|
|
|
904 |
|
|
/** Fill new node that appears instead of S[h] **/
|
905 |
|
|
RFALSE( tb->blknum[h] > 2, "blknum can not be > 2 for internal level");
|
906 |
|
|
RFALSE( tb->blknum[h] < 0, "blknum can not be < 0");
|
907 |
|
|
|
908 |
|
|
if ( ! tb->blknum[h] )
|
909 |
|
|
{ /* node S[h] is empty now */
|
910 |
|
|
RFALSE( ! tbSh, "S[h] is equal NULL");
|
911 |
|
|
|
912 |
|
|
/* do what is needed for buffer thrown from tree */
|
913 |
|
|
reiserfs_invalidate_buffer(tb,tbSh);
|
914 |
|
|
return order;
|
915 |
|
|
}
|
916 |
|
|
|
917 |
|
|
if ( ! tbSh ) {
|
918 |
|
|
/* create new root */
|
919 |
|
|
struct disk_child * dc;
|
920 |
|
|
struct buffer_head * tbSh_1 = PATH_H_PBUFFER (tb->tb_path, h - 1);
|
921 |
|
|
struct block_head * blkh;
|
922 |
|
|
|
923 |
|
|
|
924 |
|
|
if ( tb->blknum[h] != 1 )
|
925 |
|
|
reiserfs_panic(0, "balance_internal: One new node required for creating the new root");
|
926 |
|
|
/* S[h] = empty buffer from the list FEB. */
|
927 |
|
|
tbSh = get_FEB (tb);
|
928 |
|
|
blkh = B_BLK_HEAD(tbSh);
|
929 |
|
|
set_blkh_level( blkh, h + 1 );
|
930 |
|
|
|
931 |
|
|
/* Put the unique node-pointer to S[h] that points to S[h-1]. */
|
932 |
|
|
|
933 |
|
|
dc = B_N_CHILD(tbSh, 0);
|
934 |
|
|
put_dc_block_number( dc, tbSh_1->b_blocknr );
|
935 |
|
|
put_dc_size( dc, (MAX_CHILD_SIZE (tbSh_1) - B_FREE_SPACE (tbSh_1)));
|
936 |
|
|
|
937 |
|
|
tb->insert_size[h] -= DC_SIZE;
|
938 |
|
|
set_blkh_free_space( blkh, blkh_free_space(blkh) - DC_SIZE );
|
939 |
|
|
|
940 |
|
|
do_balance_mark_internal_dirty (tb, tbSh, 0);
|
941 |
|
|
|
942 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&&&*/
|
943 |
|
|
check_internal (tbSh);
|
944 |
|
|
/*&&&&&&&&&&&&&&&&&&&&&&&&*/
|
945 |
|
|
|
946 |
|
|
/* put new root into path structure */
|
947 |
|
|
PATH_OFFSET_PBUFFER(tb->tb_path, ILLEGAL_PATH_ELEMENT_OFFSET) = tbSh;
|
948 |
|
|
|
949 |
|
|
/* Change root in structure super block. */
|
950 |
|
|
PUT_SB_ROOT_BLOCK( tb->tb_sb, tbSh->b_blocknr );
|
951 |
|
|
PUT_SB_TREE_HEIGHT( tb->tb_sb, SB_TREE_HEIGHT(tb->tb_sb) + 1 );
|
952 |
|
|
do_balance_mark_sb_dirty (tb, tb->tb_sb->u.reiserfs_sb.s_sbh, 1);
|
953 |
|
|
tb->tb_sb->s_dirt = 1;
|
954 |
|
|
}
|
955 |
|
|
|
956 |
|
|
if ( tb->blknum[h] == 2 ) {
|
957 |
|
|
int snum;
|
958 |
|
|
struct buffer_info dest_bi, src_bi;
|
959 |
|
|
|
960 |
|
|
|
961 |
|
|
/* S_new = free buffer from list FEB */
|
962 |
|
|
S_new = get_FEB(tb);
|
963 |
|
|
|
964 |
|
|
set_blkh_level( B_BLK_HEAD(S_new), h + 1 );
|
965 |
|
|
|
966 |
|
|
dest_bi.tb = tb;
|
967 |
|
|
dest_bi.bi_bh = S_new;
|
968 |
|
|
dest_bi.bi_parent = 0;
|
969 |
|
|
dest_bi.bi_position = 0;
|
970 |
|
|
src_bi.tb = tb;
|
971 |
|
|
src_bi.bi_bh = tbSh;
|
972 |
|
|
src_bi.bi_parent = PATH_H_PPARENT (tb->tb_path, h);
|
973 |
|
|
src_bi.bi_position = PATH_H_POSITION (tb->tb_path, h + 1);
|
974 |
|
|
|
975 |
|
|
n = B_NR_ITEMS (tbSh); /* number of items in S[h] */
|
976 |
|
|
snum = (insert_num + n + 1)/2;
|
977 |
|
|
if ( n - snum >= child_pos ) {
|
978 |
|
|
/* new items don't fall into S_new */
|
979 |
|
|
/* store the delimiting key for the next level */
|
980 |
|
|
/* new_insert_key = (n - snum)'th key in S[h] */
|
981 |
|
|
memcpy (&new_insert_key,B_N_PDELIM_KEY(tbSh,n - snum),
|
982 |
|
|
KEY_SIZE);
|
983 |
|
|
/* last parameter is del_par */
|
984 |
|
|
internal_move_pointers_items (&dest_bi, &src_bi, LAST_TO_FIRST, snum, 0);
|
985 |
|
|
/* internal_move_pointers_items(S_new, tbSh, LAST_TO_FIRST, snum, 0);*/
|
986 |
|
|
} else if ( n + insert_num - snum < child_pos ) {
|
987 |
|
|
/* all new items fall into S_new */
|
988 |
|
|
/* store the delimiting key for the next level */
|
989 |
|
|
/* new_insert_key = (n + insert_item - snum)'th key in S[h] */
|
990 |
|
|
memcpy(&new_insert_key,B_N_PDELIM_KEY(tbSh,n + insert_num - snum),
|
991 |
|
|
KEY_SIZE);
|
992 |
|
|
/* last parameter is del_par */
|
993 |
|
|
internal_move_pointers_items (&dest_bi, &src_bi, LAST_TO_FIRST, snum - insert_num, 0);
|
994 |
|
|
/* internal_move_pointers_items(S_new,tbSh,1,snum - insert_num,0);*/
|
995 |
|
|
|
996 |
|
|
/* insert insert_num keys and node-pointers into S_new */
|
997 |
|
|
internal_insert_childs (&dest_bi, /*S_new,tb->S[h-1]->b_next,*/child_pos - n - insert_num + snum - 1,
|
998 |
|
|
insert_num,insert_key,insert_ptr);
|
999 |
|
|
|
1000 |
|
|
insert_num = 0;
|
1001 |
|
|
} else {
|
1002 |
|
|
struct disk_child * dc;
|
1003 |
|
|
|
1004 |
|
|
/* some items fall into S_new, but some don't fall */
|
1005 |
|
|
/* last parameter is del_par */
|
1006 |
|
|
internal_move_pointers_items (&dest_bi, &src_bi, LAST_TO_FIRST, n - child_pos + 1, 1);
|
1007 |
|
|
/* internal_move_pointers_items(S_new,tbSh,1,n - child_pos + 1,1);*/
|
1008 |
|
|
/* calculate number of new items that fall into S_new */
|
1009 |
|
|
k = snum - n + child_pos - 1;
|
1010 |
|
|
|
1011 |
|
|
internal_insert_childs (&dest_bi, /*S_new,*/ 0, k, insert_key + 1, insert_ptr+1);
|
1012 |
|
|
|
1013 |
|
|
/* new_insert_key = insert_key[insert_num - k - 1] */
|
1014 |
|
|
memcpy(&new_insert_key,insert_key + insert_num - k - 1,
|
1015 |
|
|
KEY_SIZE);
|
1016 |
|
|
/* replace first node-ptr in S_new by node-ptr to insert_ptr[insert_num-k-1] */
|
1017 |
|
|
|
1018 |
|
|
dc = B_N_CHILD(S_new,0);
|
1019 |
|
|
put_dc_size( dc, (MAX_CHILD_SIZE(insert_ptr[insert_num-k-1]) -
|
1020 |
|
|
B_FREE_SPACE(insert_ptr[insert_num-k-1])) );
|
1021 |
|
|
put_dc_block_number( dc, insert_ptr[insert_num-k-1]->b_blocknr );
|
1022 |
|
|
|
1023 |
|
|
do_balance_mark_internal_dirty (tb, S_new,0);
|
1024 |
|
|
|
1025 |
|
|
insert_num -= (k + 1);
|
1026 |
|
|
}
|
1027 |
|
|
/* new_insert_ptr = node_pointer to S_new */
|
1028 |
|
|
new_insert_ptr = S_new;
|
1029 |
|
|
|
1030 |
|
|
RFALSE(( buffer_locked(S_new) || atomic_read (&(S_new->b_count)) != 1) &&
|
1031 |
|
|
(buffer_locked(S_new) || atomic_read(&(S_new->b_count)) > 2 ||
|
1032 |
|
|
!(buffer_journaled(S_new) || buffer_journal_dirty(S_new))),
|
1033 |
|
|
"cm-00001: bad S_new (%b)", S_new);
|
1034 |
|
|
|
1035 |
|
|
// S_new is released in unfix_nodes
|
1036 |
|
|
}
|
1037 |
|
|
|
1038 |
|
|
n = B_NR_ITEMS (tbSh); /*number of items in S[h] */
|
1039 |
|
|
|
1040 |
|
|
if ( 0 <= child_pos && child_pos <= n && insert_num > 0 ) {
|
1041 |
|
|
bi.tb = tb;
|
1042 |
|
|
bi.bi_bh = tbSh;
|
1043 |
|
|
bi.bi_parent = PATH_H_PPARENT (tb->tb_path, h);
|
1044 |
|
|
bi.bi_position = PATH_H_POSITION (tb->tb_path, h + 1);
|
1045 |
|
|
internal_insert_childs (
|
1046 |
|
|
&bi,/*tbSh,*/
|
1047 |
|
|
/* ( tb->S[h-1]->b_parent == tb->S[h] ) ? tb->S[h-1]->b_next : tb->S[h]->b_child->b_next,*/
|
1048 |
|
|
child_pos,insert_num,insert_key,insert_ptr
|
1049 |
|
|
);
|
1050 |
|
|
}
|
1051 |
|
|
|
1052 |
|
|
|
1053 |
|
|
memcpy (new_insert_key_addr,&new_insert_key,KEY_SIZE);
|
1054 |
|
|
insert_ptr[0] = new_insert_ptr;
|
1055 |
|
|
|
1056 |
|
|
return order;
|
1057 |
|
|
}
|
1058 |
|
|
|
1059 |
|
|
|
1060 |
|
|
|