/*
 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
 */

#include <asm/uaccess.h>
#include <linux/string.h>
#include <linux/time.h>
#include <linux/reiserfs_fs.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)
{