Пример #1
0
/* Returns 1 if buf looks like an internal node, 0 otherwise */
static int
is_internal(char *buf, int blocksize, struct buf *bp)
{
	int nr, used_space;
	struct block_head *blkh;

	blkh = (struct block_head *)buf;
	nr   = blkh_level(blkh);
	if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) {
		/* This level is not possible for internal nodes */
		reiserfs_log(LOG_WARNING, "this should be caught earlier\n");
		return (0);
	}

	nr = blkh_nr_item(blkh);
	if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) {
		/*
		 * For internal which is not root we might check min
		 * number of keys
		 */
		reiserfs_log(LOG_WARNING, "number of key seems wrong\n");
		return (0);
	}

	used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1);
	if (used_space != blocksize - blkh_free_space(blkh)) {
		reiserfs_log(LOG_WARNING,
		    "is_internal: free space seems wrong\n");
		return (0);
	}

	/* One may imagine much more checks */
	return (1);
}
Пример #2
0
/* returns 1 if buf looks like an internal node, 0 otherwise */
static int is_internal(char *buf, int blocksize, struct buffer_head *bh)
{
	struct block_head *blkh;
	int nr;
	int used_space;

	blkh = (struct block_head *)buf;
	nr = blkh_level(blkh);
	if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) {
		/* this level is not possible for internal nodes */
		reiserfs_warning(NULL, "reiserfs-5087",
				 "this should be caught earlier");
		return 0;
	}

	nr = blkh_nr_item(blkh);
	if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) {
		/* for internal which is not root we might check min number of keys */
		reiserfs_warning(NULL, "reiserfs-5088",
				 "number of key seems wrong: %z", bh);
		return 0;
	}

	used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1);
	if (used_space != blocksize - blkh_free_space(blkh)) {
		reiserfs_warning(NULL, "reiserfs-5089",
				 "free space seems wrong: %z", bh);
		return 0;
	}
	// one may imagine much more checks
	return 1;
}
Пример #3
0
static void check_leaf_block_head (struct buffer_head * bh)
{
  struct block_head * blkh;
  int nr;

  blkh = B_BLK_HEAD (bh);
  nr = blkh_nr_item(blkh);
  if ( nr > (bh->b_size - BLKH_SIZE) / IH_SIZE)
    reiserfs_panic (0, "vs-6010: check_leaf_block_head: invalid item number %z", bh);
  if ( blkh_free_space(blkh) > 
      bh->b_size - BLKH_SIZE - IH_SIZE * nr )
    reiserfs_panic (0, "vs-6020: check_leaf_block_head: invalid free space %z", bh);
    
}
Пример #4
0
/* 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,
				/* insert key before key with n_dest number */
				int dest_position_before,
				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 = internal_key(dest, dest_position_before);
	memmove(key + 1, key,
		(nr - dest_position_before) * KEY_SIZE + (nr + 1) * DC_SIZE);

	/* insert key */
	memcpy(key, internal_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);
	}
}
Пример #5
0
static int
is_leaf(char *buf, int blocksize, struct buf *bp)
{
	struct item_head *ih;
	struct block_head *blkh;
	int used_space, prev_location, i, nr;

	blkh = (struct block_head *)buf;
	if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) {
		reiserfs_log(LOG_WARNING, "this should be caught earlier");
		return (0);
	}

	nr = blkh_nr_item(blkh);
	if (nr < 1 || nr >
	    ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) {
		/* Item number is too big or too small */
		reiserfs_log(LOG_WARNING, "nr_item seems wrong\n");
		return (0);
	}

	ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1;
	used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih));
	if (used_space != blocksize - blkh_free_space(blkh)) {
		/*
		 * Free space does not match to calculated amount of
		 * use space
		 */
		reiserfs_log(LOG_WARNING, "free space seems wrong\n");
		return (0);
	}

	/* FIXME: it is_leaf will hit performance too much - we may have
	 * return 1 here */

	/* Check tables of item heads */
	ih = (struct item_head *)(buf + BLKH_SIZE);
	prev_location = blocksize;
	for (i = 0; i < nr; i++, ih++) {
		if (le_ih_k_type(ih) == TYPE_ANY) {
			reiserfs_log(LOG_WARNING,
			    "wrong item type for item\n");
			return (0);
		}
		if (ih_location(ih) >= blocksize ||
		    ih_location(ih) < IH_SIZE * nr) {
			reiserfs_log(LOG_WARNING,
			    "item location seems wrong\n");
			return (0);
		}
		if (ih_item_len(ih) < 1 ||
		    ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) {
			reiserfs_log(LOG_WARNING, "item length seems wrong\n");
			return (0);
		}
		if (prev_location - ih_location(ih) != ih_item_len(ih)) {
			reiserfs_log(LOG_WARNING,
			    "item location seems wrong (second one)\n");
			return (0);
		}
		prev_location = ih_location(ih);
	}

	/* One may imagine much more checks */
	return 1;
}
Пример #6
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;
}
Пример #7
0
/* 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);
		/*&&&&&&&&&&&&&&&&&&&&&&&& */
	}

}
Пример #8
0
/* 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);
		/*&&&&&&&&&&&&&&&&&&&&&&&& */
	}
}
Пример #9
0
/* 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);
		/*&&&&&&&&&&&&&&&&&&&&&&&& */
	}

}
Пример #10
0
static int is_leaf(char *buf, int blocksize, struct buffer_head *bh)
{
	struct block_head *blkh;
	struct item_head *ih;
	int used_space;
	int prev_location;
	int i;
	int nr;

	blkh = (struct block_head *)buf;
	if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) {
		reiserfs_warning(NULL, "reiserfs-5080",
				 "this should be caught earlier");
		return 0;
	}

	nr = blkh_nr_item(blkh);
	if (nr < 1 || nr > ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) {
		/* item number is too big or too small */
		reiserfs_warning(NULL, "reiserfs-5081",
				 "nr_item seems wrong: %z", bh);
		return 0;
	}
	ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1;
	used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih));
	if (used_space != blocksize - blkh_free_space(blkh)) {
		/* free space does not match to calculated amount of use space */
		reiserfs_warning(NULL, "reiserfs-5082",
				 "free space seems wrong: %z", bh);
		return 0;
	}
	// return 1 here

	/* check tables of item heads */
	ih = (struct item_head *)(buf + BLKH_SIZE);
	prev_location = blocksize;
	for (i = 0; i < nr; i++, ih++) {
		if (le_ih_k_type(ih) == TYPE_ANY) {
			reiserfs_warning(NULL, "reiserfs-5083",
					 "wrong item type for item %h",
					 ih);
			return 0;
		}
		if (ih_location(ih) >= blocksize
		    || ih_location(ih) < IH_SIZE * nr) {
			reiserfs_warning(NULL, "reiserfs-5084",
					 "item location seems wrong: %h",
					 ih);
			return 0;
		}
		if (ih_item_len(ih) < 1
		    || ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) {
			reiserfs_warning(NULL, "reiserfs-5085",
					 "item length seems wrong: %h",
					 ih);
			return 0;
		}
		if (prev_location - ih_location(ih) != ih_item_len(ih)) {
			reiserfs_warning(NULL, "reiserfs-5086",
					 "item location seems wrong "
					 "(second one): %h", ih);
			return 0;
		}
		prev_location = ih_location(ih);
	}

	// one may imagine much more checks
	return 1;
}