Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1427 insertions, 0 deletions

diff --git a/fs/reiserfs/lbalance.c b/fs/reiserfs/lbalance.c
new file mode 100644
index 000000000..f5cebd70d
--- /dev/null
+++ b/fs/reiserfs/lbalance.c
@@ -0,0 +1,1427 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/uaccess.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include "reiserfs.h"
+#include <linux/buffer_head.h>
+
+/*
+ * copy copy_count entries from source directory item to dest buffer
+ * (creating new item if needed)
+ */
+static void leaf_copy_dir_entries(struct buffer_info *dest_bi,
+				  struct buffer_head *source, int last_first,
+				  int item_num, int from, int copy_count)
+{
+	struct buffer_head *dest = dest_bi->bi_bh;
+	/*
+	 * either the number of target item, or if we must create a
+	 * new item, the number of the item we will create it next to
+	 */
+	int item_num_in_dest;
+
+	struct item_head *ih;
+	struct reiserfs_de_head *deh;
+	int copy_records_len;	/* length of all records in item to be copied */
+	char *records;
+
+	ih = item_head(source, item_num);
+
+	RFALSE(!is_direntry_le_ih(ih), "vs-10000: item must be directory item");
+
+	/*
+	 * length of all record to be copied and first byte of
+	 * the last of them
+	 */
+	deh = B_I_DEH(source, ih);
+	if (copy_count) {
+		copy_records_len = (from ? deh_location(&deh[from - 1]) :
+				    ih_item_len(ih)) -
+		    deh_location(&deh[from + copy_count - 1]);
+		records =
+		    source->b_data + ih_location(ih) +
+		    deh_location(&deh[from + copy_count - 1]);
+	} else {
+		copy_records_len = 0;
+		records = NULL;
+	}
+
+	/* when copy last to first, dest buffer can contain 0 items */
+	item_num_in_dest =
+	    (last_first ==
+	     LAST_TO_FIRST) ? ((B_NR_ITEMS(dest)) ? 0 : -1) : (B_NR_ITEMS(dest)
+							       - 1);
+
+	/*
+	 * if there are no items in dest or the first/last item in
+	 * dest is not item of the same directory
+	 */
+	if ((item_num_in_dest == -1) ||
+	    (last_first == FIRST_TO_LAST && le_ih_k_offset(ih) == DOT_OFFSET) ||
+	    (last_first == LAST_TO_FIRST
+	     && comp_short_le_keys /*COMP_SHORT_KEYS */ (&ih->ih_key,
+							 leaf_key(dest,
+								  item_num_in_dest))))
+	{
+		/* create new item in dest */
+		struct item_head new_ih;
+
+		/* form item header */
+		memcpy(&new_ih.ih_key, &ih->ih_key, KEY_SIZE);
+		put_ih_version(&new_ih, KEY_FORMAT_3_5);
+		/* calculate item len */
+		put_ih_item_len(&new_ih,
+				DEH_SIZE * copy_count + copy_records_len);
+		put_ih_entry_count(&new_ih, 0);
+
+		if (last_first == LAST_TO_FIRST) {
+			/* form key by the following way */
+			if (from < ih_entry_count(ih)) {
+				set_le_ih_k_offset(&new_ih,
+						   deh_offset(&deh[from]));
+			} else {
+				/*
+				 * no entries will be copied to this
+				 * item in this function
+				 */
+				set_le_ih_k_offset(&new_ih, U32_MAX);
+				/*
+				 * this item is not yet valid, but we
+				 * want I_IS_DIRECTORY_ITEM to return 1
+				 * for it, so we -1
+				 */
+			}
+			set_le_key_k_type(KEY_FORMAT_3_5, &new_ih.ih_key,
+					  TYPE_DIRENTRY);
+		}
+
+		/* insert item into dest buffer */
+		leaf_insert_into_buf(dest_bi,
+				     (last_first ==
+				      LAST_TO_FIRST) ? 0 : B_NR_ITEMS(dest),
+				     &new_ih, NULL, 0);
+	} else {
+		/* prepare space for entries */
+		leaf_paste_in_buffer(dest_bi,
+				     (last_first ==
+				      FIRST_TO_LAST) ? (B_NR_ITEMS(dest) -
+							1) : 0, MAX_US_INT,
+				     DEH_SIZE * copy_count + copy_records_len,
+				     records, 0);
+	}
+
+	item_num_in_dest =
+	    (last_first == FIRST_TO_LAST) ? (B_NR_ITEMS(dest) - 1) : 0;
+
+	leaf_paste_entries(dest_bi, item_num_in_dest,
+			   (last_first ==
+			    FIRST_TO_LAST) ? ih_entry_count(item_head(dest,
+									  item_num_in_dest))
+			   : 0, copy_count, deh + from, records,
+			   DEH_SIZE * copy_count + copy_records_len);
+}
+
+/*
+ * Copy the first (if last_first == FIRST_TO_LAST) or last
+ * (last_first == LAST_TO_FIRST) item or part of it or nothing
+ * (see the return 0 below) from SOURCE to the end (if last_first)
+ * or beginning (!last_first) of the DEST
+ */
+/* returns 1 if anything was copied, else 0 */
+static int leaf_copy_boundary_item(struct buffer_info *dest_bi,
+				   struct buffer_head *src, int last_first,
+				   int bytes_or_entries)
+{
+	struct buffer_head *dest = dest_bi->bi_bh;
+	/* number of items in the source and destination buffers */
+	int dest_nr_item, src_nr_item;
+	struct item_head *ih;
+	struct item_head *dih;
+
+	dest_nr_item = B_NR_ITEMS(dest);
+
+	/*
+	 * if ( DEST is empty or first item of SOURCE and last item of
+	 * DEST are the items of different objects or of different types )
+	 * then there is no need to treat this item differently from the
+	 * other items that we copy, so we return
+	 */
+	if (last_first == FIRST_TO_LAST) {
+		ih = item_head(src, 0);
+		dih = item_head(dest, dest_nr_item - 1);
+
+		/* there is nothing to merge */
+		if (!dest_nr_item
+		    || (!op_is_left_mergeable(&ih->ih_key, src->b_size)))
+			return 0;
+
+		RFALSE(!ih_item_len(ih),
+		       "vs-10010: item can not have empty length");
+
+		if (is_direntry_le_ih(ih)) {
+			if (bytes_or_entries == -1)
+				/* copy all entries to dest */
+				bytes_or_entries = ih_entry_count(ih);
+			leaf_copy_dir_entries(dest_bi, src, FIRST_TO_LAST, 0, 0,
+					      bytes_or_entries);
+			return 1;
+		}
+
+		/*
+		 * copy part of the body of the first item of SOURCE
+		 * to the end of the body of the last item of the DEST
+		 * part defined by 'bytes_or_entries'; if bytes_or_entries
+		 * == -1 copy whole body; don't create new item header
+		 */
+		if (bytes_or_entries == -1)
+			bytes_or_entries = ih_item_len(ih);
+
+#ifdef CONFIG_REISERFS_CHECK
+		else {
+			if (bytes_or_entries == ih_item_len(ih)
+			    && is_indirect_le_ih(ih))
+				if (get_ih_free_space(ih))
+					reiserfs_panic(sb_from_bi(dest_bi),
+						       "vs-10020",
+						       "last unformatted node "
+						       "must be filled "
+						       "entirely (%h)", ih);
+		}
+#endif
+
+		/*
+		 * merge first item (or its part) of src buffer with the last
+		 * item of dest buffer. Both are of the same file
+		 */
+		leaf_paste_in_buffer(dest_bi,
+				     dest_nr_item - 1, ih_item_len(dih),
+				     bytes_or_entries, ih_item_body(src, ih), 0);
+
+		if (is_indirect_le_ih(dih)) {
+			RFALSE(get_ih_free_space(dih),
+			       "vs-10030: merge to left: last unformatted node of non-last indirect item %h must have zerto free space",
+			       ih);
+			if (bytes_or_entries == ih_item_len(ih))
+				set_ih_free_space(dih, get_ih_free_space(ih));
+		}
+
+		return 1;
+	}
+
+	/* copy boundary item to right (last_first == LAST_TO_FIRST) */
+
+	/*
+	 * (DEST is empty or last item of SOURCE and first item of DEST
+	 * are the items of different object or of different types)
+	 */
+	src_nr_item = B_NR_ITEMS(src);
+	ih = item_head(src, src_nr_item - 1);
+	dih = item_head(dest, 0);
+
+	if (!dest_nr_item || !op_is_left_mergeable(&dih->ih_key, src->b_size))
+		return 0;
+
+	if (is_direntry_le_ih(ih)) {
+		/*
+		 * bytes_or_entries = entries number in last
+		 * item body of SOURCE
+		 */
+		if (bytes_or_entries == -1)
+			bytes_or_entries = ih_entry_count(ih);
+
+		leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST,
+				      src_nr_item - 1,
+				      ih_entry_count(ih) - bytes_or_entries,
+				      bytes_or_entries);
+		return 1;
+	}
+
+	/*
+	 * copy part of the body of the last item of SOURCE to the
+	 * begin of the body of the first item of the DEST; part defined
+	 * by 'bytes_or_entries'; if byte_or_entriess == -1 copy whole body;
+	 * change first item key of the DEST; don't create new item header
+	 */
+
+	RFALSE(is_indirect_le_ih(ih) && get_ih_free_space(ih),
+	       "vs-10040: merge to right: last unformatted node of non-last indirect item must be filled entirely (%h)",
+	       ih);
+
+	if (bytes_or_entries == -1) {
+		/* bytes_or_entries = length of last item body of SOURCE */
+		bytes_or_entries = ih_item_len(ih);
+
+		RFALSE(le_ih_k_offset(dih) !=
+		       le_ih_k_offset(ih) + op_bytes_number(ih, src->b_size),
+		       "vs-10050: items %h and %h do not match", ih, dih);
+
+		/* change first item key of the DEST */
+		set_le_ih_k_offset(dih, le_ih_k_offset(ih));
+
+		/* item becomes non-mergeable */
+		/* or mergeable if left item was */
+		set_le_ih_k_type(dih, le_ih_k_type(ih));
+	} else {
+		/* merge to right only part of item */
+		RFALSE(ih_item_len(ih) <= bytes_or_entries,
+		       "vs-10060: no so much bytes %lu (needed %lu)",
+		       (unsigned long)ih_item_len(ih),
+		       (unsigned long)bytes_or_entries);
+
+		/* change first item key of the DEST */
+		if (is_direct_le_ih(dih)) {
+			RFALSE(le_ih_k_offset(dih) <=
+			       (unsigned long)bytes_or_entries,
+			       "vs-10070: dih %h, bytes_or_entries(%d)", dih,
+			       bytes_or_entries);
+			set_le_ih_k_offset(dih,
+					   le_ih_k_offset(dih) -
+					   bytes_or_entries);
+		} else {
+			RFALSE(le_ih_k_offset(dih) <=
+			       (bytes_or_entries / UNFM_P_SIZE) * dest->b_size,
+			       "vs-10080: dih %h, bytes_or_entries(%d)",
+			       dih,
+			       (bytes_or_entries / UNFM_P_SIZE) * dest->b_size);
+			set_le_ih_k_offset(dih,
+					   le_ih_k_offset(dih) -
+					   ((bytes_or_entries / UNFM_P_SIZE) *
+					    dest->b_size));
+		}
+	}
+
+	leaf_paste_in_buffer(dest_bi, 0, 0, bytes_or_entries,
+			     ih_item_body(src,
+				       ih) + ih_item_len(ih) - bytes_or_entries,
+			     0);
+	return 1;
+}
+
+/*
+ * copy cpy_mun items from buffer src to buffer dest
+ * last_first == FIRST_TO_LAST means, that we copy cpy_num items beginning
+ *                             from first-th item in src to tail of dest
+ * last_first == LAST_TO_FIRST means, that we copy cpy_num items beginning
+ *                             from first-th item in src to head of dest
+ */
+static void leaf_copy_items_entirely(struct buffer_info *dest_bi,
+				     struct buffer_head *src, int last_first,
+				     int first, int cpy_num)
+{
+	struct buffer_head *dest;
+	int nr, free_space;
+	int dest_before;
+	int last_loc, last_inserted_loc, location;
+	int i, j;
+	struct block_head *blkh;
+	struct item_head *ih;
+
+	RFALSE(last_first != LAST_TO_FIRST && last_first != FIRST_TO_LAST,
+	       "vs-10090: bad last_first parameter %d", last_first);
+	RFALSE(B_NR_ITEMS(src) - first < cpy_num,
+	       "vs-10100: too few items in source %d, required %d from %d",
+	       B_NR_ITEMS(src), cpy_num, first);
+	RFALSE(cpy_num < 0, "vs-10110: can not copy negative amount of items");
+	RFALSE(!dest_bi, "vs-10120: can not copy negative amount of items");
+
+	dest = dest_bi->bi_bh;
+
+	RFALSE(!dest, "vs-10130: can not copy negative amount of items");
+
+	if (cpy_num == 0)
+		return;
+
+	blkh = B_BLK_HEAD(dest);
+	nr = blkh_nr_item(blkh);
+	free_space = blkh_free_space(blkh);
+
+	/*
+	 * we will insert items before 0-th or nr-th item in dest buffer.
+	 * It depends of last_first parameter
+	 */
+	dest_before = (last_first == LAST_TO_FIRST) ? 0 : nr;
+
+	/* location of head of first new item */
+	ih = item_head(dest, dest_before);
+
+	RFALSE(blkh_free_space(blkh) < cpy_num * IH_SIZE,
+	       "vs-10140: not enough free space for headers %d (needed %d)",
+	       B_FREE_SPACE(dest), cpy_num * IH_SIZE);
+
+	/* prepare space for headers */
+	memmove(ih + cpy_num, ih, (nr - dest_before) * IH_SIZE);
+
+	/* copy item headers */
+	memcpy(ih, item_head(src, first), cpy_num * IH_SIZE);
+
+	free_space -= (IH_SIZE * cpy_num);
+	set_blkh_free_space(blkh, free_space);
+
+	/* location of unmovable item */
+	j = location = (dest_before == 0) ? dest->b_size : ih_location(ih - 1);
+	for (i = dest_before; i < nr + cpy_num; i++) {
+		location -= ih_item_len(ih + i - dest_before);
+		put_ih_location(ih + i - dest_before, location);
+	}
+
+	/* prepare space for items */
+	last_loc = ih_location(&ih[nr + cpy_num - 1 - dest_before]);
+	last_inserted_loc = ih_location(&ih[cpy_num - 1]);
+
+	/* check free space */
+	RFALSE(free_space < j - last_inserted_loc,
+	       "vs-10150: not enough free space for items %d (needed %d)",
+	       free_space, j - last_inserted_loc);
+
+	memmove(dest->b_data + last_loc,
+		dest->b_data + last_loc + j - last_inserted_loc,
+		last_inserted_loc - last_loc);
+
+	/* copy items */
+	memcpy(dest->b_data + last_inserted_loc,
+	       item_body(src, (first + cpy_num - 1)),
+	       j - last_inserted_loc);
+
+	/* sizes, item number */
+	set_blkh_nr_item(blkh, nr + cpy_num);
+	set_blkh_free_space(blkh, free_space - (j - last_inserted_loc));
+
+	do_balance_mark_leaf_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);
+		RFALSE(dc_block_number(t_dc) != dest->b_blocknr,
+		       "vs-10160: block number in bh does not match to field in disk_child structure %lu and %lu",
+		       (long unsigned)dest->b_blocknr,
+		       (long unsigned)dc_block_number(t_dc));
+		put_dc_size(t_dc,
+			    dc_size(t_dc) + (j - last_inserted_loc +
+					     IH_SIZE * cpy_num));
+
+		do_balance_mark_internal_dirty(dest_bi->tb, dest_bi->bi_parent,
+					       0);
+	}
+}
+
+/*
+ * This function splits the (liquid) item into two items (useful when
+ * shifting part of an item into another node.)
+ */
+static void leaf_item_bottle(struct buffer_info *dest_bi,
+			     struct buffer_head *src, int last_first,
+			     int item_num, int cpy_bytes)
+{
+	struct buffer_head *dest = dest_bi->bi_bh;
+	struct item_head *ih;
+
+	RFALSE(cpy_bytes == -1,
+	       "vs-10170: bytes == - 1 means: do not split item");
+
+	if (last_first == FIRST_TO_LAST) {
+		/*
+		 * if ( if item in position item_num in buffer SOURCE
+		 * is directory item )
+		 */
+		ih = item_head(src, item_num);
+		if (is_direntry_le_ih(ih))
+			leaf_copy_dir_entries(dest_bi, src, FIRST_TO_LAST,
+					      item_num, 0, cpy_bytes);
+		else {
+			struct item_head n_ih;
+
+			/*
+			 * copy part of the body of the item number 'item_num'
+			 * of SOURCE to the end of the DEST part defined by
+			 * 'cpy_bytes'; create new item header; change old
+			 * item_header (????); n_ih = new item_header;
+			 */
+			memcpy(&n_ih, ih, IH_SIZE);
+			put_ih_item_len(&n_ih, cpy_bytes);
+			if (is_indirect_le_ih(ih)) {
+				RFALSE(cpy_bytes == ih_item_len(ih)
+				       && get_ih_free_space(ih),
+				       "vs-10180: when whole indirect item is bottle to left neighbor, it must have free_space==0 (not %lu)",
+				       (long unsigned)get_ih_free_space(ih));
+				set_ih_free_space(&n_ih, 0);
+			}
+
+			RFALSE(op_is_left_mergeable(&ih->ih_key, src->b_size),
+			       "vs-10190: bad mergeability of item %h", ih);
+			n_ih.ih_version = ih->ih_version;	/* JDM Endian safe, both le */
+			leaf_insert_into_buf(dest_bi, B_NR_ITEMS(dest), &n_ih,
+					     item_body(src, item_num), 0);
+		}
+	} else {
+		/*
+		 * if ( if item in position item_num in buffer
+		 * SOURCE is directory item )
+		 */
+		ih = item_head(src, item_num);
+		if (is_direntry_le_ih(ih))
+			leaf_copy_dir_entries(dest_bi, src, LAST_TO_FIRST,
+					      item_num,
+					      ih_entry_count(ih) - cpy_bytes,
+					      cpy_bytes);
+		else {
+			struct item_head n_ih;
+
+			/*
+			 * copy part of the body of the item number 'item_num'
+			 * of SOURCE to the begin of the DEST part defined by
+			 * 'cpy_bytes'; create new item header;
+			 * n_ih = new item_header;
+			 */
+			memcpy(&n_ih.ih_key, &ih->ih_key, KEY_SIZE);
+
+			/* Endian safe, both le */
+			n_ih.ih_version = ih->ih_version;
+
+			if (is_direct_le_ih(ih)) {
+				set_le_ih_k_offset(&n_ih,
+						   le_ih_k_offset(ih) +
+						   ih_item_len(ih) - cpy_bytes);
+				set_le_ih_k_type(&n_ih, TYPE_DIRECT);
+				set_ih_free_space(&n_ih, MAX_US_INT);
+			} else {
+				/* indirect item */
+				RFALSE(!cpy_bytes && get_ih_free_space(ih),
+				       "vs-10200: ih->ih_free_space must be 0 when indirect item will be appended");
+				set_le_ih_k_offset(&n_ih,
+						   le_ih_k_offset(ih) +
+						   (ih_item_len(ih) -
+						    cpy_bytes) / UNFM_P_SIZE *
+						   dest->b_size);
+				set_le_ih_k_type(&n_ih, TYPE_INDIRECT);
+				set_ih_free_space(&n_ih, get_ih_free_space(ih));
+			}
+
+			/* set item length */
+			put_ih_item_len(&n_ih, cpy_bytes);
+
+			/* Endian safe, both le */
+			n_ih.ih_version = ih->ih_version;
+
+			leaf_insert_into_buf(dest_bi, 0, &n_ih,
+					     item_body(src, item_num) +
+						ih_item_len(ih) - cpy_bytes, 0);
+		}
+	}
+}
+
+/*
+ * If cpy_bytes equals minus one than copy cpy_num whole items from SOURCE
+ * to DEST.  If cpy_bytes not equal to minus one than copy cpy_num-1 whole
+ * items from SOURCE to DEST.  From last item copy cpy_num bytes for regular
+ * item and cpy_num directory entries for directory item.
+ */
+static int leaf_copy_items(struct buffer_info *dest_bi, struct buffer_head *src,
+			   int last_first, int cpy_num, int cpy_bytes)
+{
+	struct buffer_head *dest;
+	int pos, i, src_nr_item, bytes;
+
+	dest = dest_bi->bi_bh;
+	RFALSE(!dest || !src, "vs-10210: !dest || !src");
+	RFALSE(last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST,
+	       "vs-10220:last_first != FIRST_TO_LAST && last_first != LAST_TO_FIRST");
+	RFALSE(B_NR_ITEMS(src) < cpy_num,
+	       "vs-10230: No enough items: %d, req. %d", B_NR_ITEMS(src),
+	       cpy_num);
+	RFALSE(cpy_num < 0, "vs-10240: cpy_num < 0 (%d)", cpy_num);
+
+	if (cpy_num == 0)
+		return 0;
+
+	if (last_first == FIRST_TO_LAST) {
+		/* copy items to left */
+		pos = 0;
+		if (cpy_num == 1)
+			bytes = cpy_bytes;
+		else
+			bytes = -1;
+
+		/*
+		 * copy the first item or it part or nothing to the end of
+		 * the DEST (i = leaf_copy_boundary_item(DEST,SOURCE,0,bytes))
+		 */
+		i = leaf_copy_boundary_item(dest_bi, src, FIRST_TO_LAST, bytes);
+		cpy_num -= i;
+		if (cpy_num == 0)
+			return i;
+		pos += i;
+		if (cpy_bytes == -1)
+			/*
+			 * copy first cpy_num items starting from position
+			 * 'pos' of SOURCE to end of DEST
+			 */
+			leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST,
+						 pos, cpy_num);
+		else {
+			/*
+			 * copy first cpy_num-1 items starting from position
+			 * 'pos-1' of the SOURCE to the end of the DEST
+			 */
+			leaf_copy_items_entirely(dest_bi, src, FIRST_TO_LAST,
+						 pos, cpy_num - 1);
+
+			/*
+			 * copy part of the item which number is
+			 * cpy_num+pos-1 to the end of the DEST
+			 */
+			leaf_item_bottle(dest_bi, src, FIRST_TO_LAST,
+					 cpy_num + pos - 1, cpy_bytes);
+		}
+	} else {
+		/* copy items to right */
+		src_nr_item = B_NR_ITEMS(src);
+		if (cpy_num == 1)
+			bytes = cpy_bytes;
+		else
+			bytes = -1;
+
+		/*
+		 * copy the last item or it part or nothing to the
+		 * begin of the DEST
+		 * (i = leaf_copy_boundary_item(DEST,SOURCE,1,bytes));
+		 */
+		i = leaf_copy_boundary_item(dest_bi, src, LAST_TO_FIRST, bytes);
+
+		cpy_num -= i;
+		if (cpy_num == 0)
+			return i;
+
+		pos = src_nr_item - cpy_num - i;
+		if (cpy_bytes == -1) {
+			/*
+			 * starting from position 'pos' copy last cpy_num
+			 * items of SOURCE to begin of DEST
+			 */
+			leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST,
+						 pos, cpy_num);
+		} else {
+			/*
+			 * copy last cpy_num-1 items starting from position
+			 * 'pos+1' of the SOURCE to the begin of the DEST;
+			 */
+			leaf_copy_items_entirely(dest_bi, src, LAST_TO_FIRST,
+						 pos + 1, cpy_num - 1);
+
+			/*
+			 * copy part of the item which number is pos to
+			 * the begin of the DEST
+			 */
+			leaf_item_bottle(dest_bi, src, LAST_TO_FIRST, pos,
+					 cpy_bytes);
+		}
+	}
+	return i;
+}
+
+/*
+ * there are types of coping: from S[0] to L[0], from S[0] to R[0],
+ * from R[0] to L[0]. for each of these we have to define parent and
+ * positions of destination and source buffers
+ */
+static void leaf_define_dest_src_infos(int shift_mode, struct tree_balance *tb,
+				       struct buffer_info *dest_bi,
+				       struct buffer_info *src_bi,
+				       int *first_last,
+				       struct buffer_head *Snew)
+{
+	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 LEAF_FROM_S_TO_L:	/* it is used in leaf_shift_left */
+		src_bi->tb = tb;
+		src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
+		src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
+
+		/* src->b_item_order */
+		src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
+		dest_bi->tb = tb;
+		dest_bi->bi_bh = tb->L[0];
+		dest_bi->bi_parent = tb->FL[0];
+		dest_bi->bi_position = get_left_neighbor_position(tb, 0);
+		*first_last = FIRST_TO_LAST;
+		break;
+
+	case LEAF_FROM_S_TO_R:	/* it is used in leaf_shift_right */
+		src_bi->tb = tb;
+		src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
+		src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
+		src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
+		dest_bi->tb = tb;
+		dest_bi->bi_bh = tb->R[0];
+		dest_bi->bi_parent = tb->FR[0];
+		dest_bi->bi_position = get_right_neighbor_position(tb, 0);
+		*first_last = LAST_TO_FIRST;
+		break;
+
+	case LEAF_FROM_R_TO_L:	/* it is used in balance_leaf_when_delete */
+		src_bi->tb = tb;
+		src_bi->bi_bh = tb->R[0];
+		src_bi->bi_parent = tb->FR[0];
+		src_bi->bi_position = get_right_neighbor_position(tb, 0);
+		dest_bi->tb = tb;
+		dest_bi->bi_bh = tb->L[0];
+		dest_bi->bi_parent = tb->FL[0];
+		dest_bi->bi_position = get_left_neighbor_position(tb, 0);
+		*first_last = FIRST_TO_LAST;
+		break;
+
+	case LEAF_FROM_L_TO_R:	/* it is used in balance_leaf_when_delete */
+		src_bi->tb = tb;
+		src_bi->bi_bh = tb->L[0];
+		src_bi->bi_parent = tb->FL[0];
+		src_bi->bi_position = get_left_neighbor_position(tb, 0);
+		dest_bi->tb = tb;
+		dest_bi->bi_bh = tb->R[0];
+		dest_bi->bi_parent = tb->FR[0];
+		dest_bi->bi_position = get_right_neighbor_position(tb, 0);
+		*first_last = LAST_TO_FIRST;
+		break;
+
+	case LEAF_FROM_S_TO_SNEW:
+		src_bi->tb = tb;
+		src_bi->bi_bh = PATH_PLAST_BUFFER(tb->tb_path);
+		src_bi->bi_parent = PATH_H_PPARENT(tb->tb_path, 0);
+		src_bi->bi_position = PATH_H_B_ITEM_ORDER(tb->tb_path, 0);
+		dest_bi->tb = tb;
+		dest_bi->bi_bh = Snew;
+		dest_bi->bi_parent = NULL;
+		dest_bi->bi_position = 0;
+		*first_last = LAST_TO_FIRST;
+		break;
+
+	default:
+		reiserfs_panic(sb_from_bi(src_bi), "vs-10250",
+			       "shift type is unknown (%d)", shift_mode);
+	}
+	RFALSE(!src_bi->bi_bh || !dest_bi->bi_bh,
+	       "vs-10260: mode==%d, source (%p) or dest (%p) buffer is initialized incorrectly",
+	       shift_mode, src_bi->bi_bh, dest_bi->bi_bh);
+}
+
+/*
+ * copy mov_num items and mov_bytes of the (mov_num-1)th item to
+ * neighbor. Delete them from source
+ */
+int leaf_move_items(int shift_mode, struct tree_balance *tb, int mov_num,
+		    int mov_bytes, struct buffer_head *Snew)
+{
+	int ret_value;
+	struct buffer_info dest_bi, src_bi;
+	int first_last;
+
+	leaf_define_dest_src_infos(shift_mode, tb, &dest_bi, &src_bi,
+				   &first_last, Snew);
+
+	ret_value =
+	    leaf_copy_items(&dest_bi, src_bi.bi_bh, first_last, mov_num,
+			    mov_bytes);
+
+	leaf_delete_items(&src_bi, first_last,
+			  (first_last ==
+			   FIRST_TO_LAST) ? 0 : (B_NR_ITEMS(src_bi.bi_bh) -
+						 mov_num), mov_num, mov_bytes);
+
+	return ret_value;
+}
+
+/*
+ * Shift shift_num items (and shift_bytes of last shifted item if
+ * shift_bytes != -1) from S[0] to L[0] and replace the delimiting key
+ */
+int leaf_shift_left(struct tree_balance *tb, int shift_num, int shift_bytes)
+{
+	struct buffer_head *S0 = PATH_PLAST_BUFFER(tb->tb_path);
+	int i;
+
+	/*
+	 * move shift_num (and shift_bytes bytes) items from S[0]
+	 * to left neighbor L[0]
+	 */
+	i = leaf_move_items(LEAF_FROM_S_TO_L, tb, shift_num, shift_bytes, NULL);
+
+	if (shift_num) {
+		/* number of items in S[0] == 0 */
+		if (B_NR_ITEMS(S0) == 0) {
+
+			RFALSE(shift_bytes != -1,
+			       "vs-10270: S0 is empty now, but shift_bytes != -1 (%d)",
+			       shift_bytes);
+#ifdef CONFIG_REISERFS_CHECK
+			if (tb->tb_mode == M_PASTE || tb->tb_mode == M_INSERT) {
+				print_cur_tb("vs-10275");
+				reiserfs_panic(tb->tb_sb, "vs-10275",
+					       "balance condition corrupted "
+					       "(%c)", tb->tb_mode);
+			}
+#endif
+
+			if (PATH_H_POSITION(tb->tb_path, 1) == 0)
+				replace_key(tb, tb->CFL[0], tb->lkey[0],
+					    PATH_H_PPARENT(tb->tb_path, 0), 0);
+
+		} else {
+			/* replace lkey in CFL[0] by 0-th key from S[0]; */
+			replace_key(tb, tb->CFL[0], tb->lkey[0], S0, 0);
+
+			RFALSE((shift_bytes != -1 &&
+				!(is_direntry_le_ih(item_head(S0, 0))
+				  && !ih_entry_count(item_head(S0, 0)))) &&
+			       (!op_is_left_mergeable
+				(leaf_key(S0, 0), S0->b_size)),
+			       "vs-10280: item must be mergeable");
+		}
+	}
+
+	return i;
+}
+
+/* CLEANING STOPPED HERE */
+
+/*
+ * Shift shift_num (shift_bytes) items from S[0] to the right neighbor,
+ * and replace the delimiting key
+ */
+int leaf_shift_right(struct tree_balance *tb, int shift_num, int shift_bytes)
+{
+	int ret_value;
+
+	/*
+	 * move shift_num (and shift_bytes) items from S[0] to
+	 * right neighbor R[0]
+	 */
+	ret_value =
+	    leaf_move_items(LEAF_FROM_S_TO_R, tb, shift_num, shift_bytes, NULL);
+
+	/* replace rkey in CFR[0] by the 0-th key from R[0] */
+	if (shift_num) {
+		replace_key(tb, tb->CFR[0], tb->rkey[0], tb->R[0], 0);
+
+	}
+
+	return ret_value;
+}
+
+static void leaf_delete_items_entirely(struct buffer_info *bi,
+				       int first, int del_num);
+/*
+ * If del_bytes == -1, starting from position 'first' delete del_num
+ * items in whole in buffer CUR.
+ *   If not.
+ *   If last_first == 0. Starting from position 'first' delete del_num-1
+ *   items in whole. Delete part of body of the first item. Part defined by
+ *   del_bytes. Don't delete first item header
+ *   If last_first == 1. Starting from position 'first+1' delete del_num-1
+ *   items in whole. Delete part of body of the last item . Part defined by
+ *   del_bytes. Don't delete last item header.
+*/
+void leaf_delete_items(struct buffer_info *cur_bi, int last_first,
+		       int first, int del_num, int del_bytes)
+{
+	struct buffer_head *bh;
+	int item_amount = B_NR_ITEMS(bh = cur_bi->bi_bh);
+
+	RFALSE(!bh, "10155: bh is not defined");
+	RFALSE(del_num < 0, "10160: del_num can not be < 0. del_num==%d",
+	       del_num);
+	RFALSE(first < 0
+	       || first + del_num > item_amount,
+	       "10165: invalid number of first item to be deleted (%d) or "
+	       "no so much items (%d) to delete (only %d)", first,
+	       first + del_num, item_amount);
+
+	if (del_num == 0)
+		return;
+
+	if (first == 0 && del_num == item_amount && del_bytes == -1) {
+		make_empty_node(cur_bi);
+		do_balance_mark_leaf_dirty(cur_bi->tb, bh, 0);
+		return;
+	}
+
+	if (del_bytes == -1)
+		/* delete del_num items beginning from item in position first */
+		leaf_delete_items_entirely(cur_bi, first, del_num);
+	else {
+		if (last_first == FIRST_TO_LAST) {
+			/*
+			 * delete del_num-1 items beginning from
+			 * item in position first
+			 */
+			leaf_delete_items_entirely(cur_bi, first, del_num - 1);
+
+			/*
+			 * delete the part of the first item of the bh
+			 * do not delete item header
+			 */
+			leaf_cut_from_buffer(cur_bi, 0, 0, del_bytes);
+		} else {
+			struct item_head *ih;
+			int len;
+
+			/*
+			 * delete del_num-1 items beginning from
+			 * item in position first+1
+			 */
+			leaf_delete_items_entirely(cur_bi, first + 1,
+						   del_num - 1);
+
+			ih = item_head(bh, B_NR_ITEMS(bh) - 1);
+			if (is_direntry_le_ih(ih))
+				/* the last item is directory  */
+				/*
+				 * len = numbers of directory entries
+				 * in this item
+				 */
+				len = ih_entry_count(ih);
+			else
+				/* len = body len of item */
+				len = ih_item_len(ih);
+
+			/*
+			 * delete the part of the last item of the bh
+			 * do not delete item header
+			 */
+			leaf_cut_from_buffer(cur_bi, B_NR_ITEMS(bh) - 1,
+					     len - del_bytes, del_bytes);
+		}
+	}
+}
+
+/* insert item into the leaf node in position before */
+void leaf_insert_into_buf(struct buffer_info *bi, int before,
+			  struct item_head * const inserted_item_ih,
+			  const char * const inserted_item_body,
+			  int zeros_number)
+{
+	struct buffer_head *bh = bi->bi_bh;
+	int nr, free_space;
+	struct block_head *blkh;
+	struct item_head *ih;
+	int i;
+	int last_loc, unmoved_loc;
+	char *to;
+
+	blkh = B_BLK_HEAD(bh);
+	nr = blkh_nr_item(blkh);
+	free_space = blkh_free_space(blkh);
+
+	/* check free space */
+	RFALSE(free_space < ih_item_len(inserted_item_ih) + IH_SIZE,
+	       "vs-10170: not enough free space in block %z, new item %h",
+	       bh, inserted_item_ih);
+	RFALSE(zeros_number > ih_item_len(inserted_item_ih),
+	       "vs-10172: zero number == %d, item length == %d",
+	       zeros_number, ih_item_len(inserted_item_ih));
+
+	/* get item new item must be inserted before */
+	ih = item_head(bh, before);
+
+	/* prepare space for the body of new item */
+	last_loc = nr ? ih_location(&ih[nr - before - 1]) : bh->b_size;
+	unmoved_loc = before ? ih_location(ih - 1) : bh->b_size;
+
+	memmove(bh->b_data + last_loc - ih_item_len(inserted_item_ih),
+		bh->b_data + last_loc, unmoved_loc - last_loc);
+
+	to = bh->b_data + unmoved_loc - ih_item_len(inserted_item_ih);
+	memset(to, 0, zeros_number);
+	to += zeros_number;
+
+	/* copy body to prepared space */
+	if (inserted_item_body)
+		memmove(to, inserted_item_body,
+			ih_item_len(inserted_item_ih) - zeros_number);
+	else
+		memset(to, '\0', ih_item_len(inserted_item_ih) - zeros_number);
+
+	/* insert item header */
+	memmove(ih + 1, ih, IH_SIZE * (nr - before));
+	memmove(ih, inserted_item_ih, IH_SIZE);
+
+	/* change locations */
+	for (i = before; i < nr + 1; i++) {
+		unmoved_loc -= ih_item_len(&ih[i - before]);
+		put_ih_location(&ih[i - before], unmoved_loc);
+	}
+
+	/* sizes, free space, item number */
+	set_blkh_nr_item(blkh, blkh_nr_item(blkh) + 1);
+	set_blkh_free_space(blkh,
+			    free_space - (IH_SIZE +
+					  ih_item_len(inserted_item_ih)));
+	do_balance_mark_leaf_dirty(bi->tb, bh, 1);
+
+	if (bi->bi_parent) {
+		struct disk_child *t_dc;
+		t_dc = B_N_CHILD(bi->bi_parent, bi->bi_position);
+		put_dc_size(t_dc,
+			    dc_size(t_dc) + (IH_SIZE +
+					     ih_item_len(inserted_item_ih)));
+		do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
+	}
+}
+
+/*
+ * paste paste_size bytes to affected_item_num-th item.
+ * When item is a directory, this only prepare space for new entries
+ */
+void leaf_paste_in_buffer(struct buffer_info *bi, int affected_item_num,
+			  int pos_in_item, int paste_size,
+			  const char *body, int zeros_number)
+{
+	struct buffer_head *bh = bi->bi_bh;
+	int nr, free_space;
+	struct block_head *blkh;
+	struct item_head *ih;
+	int i;
+	int last_loc, unmoved_loc;
+
+	blkh = B_BLK_HEAD(bh);
+	nr = blkh_nr_item(blkh);
+	free_space = blkh_free_space(blkh);
+
+	/* check free space */
+	RFALSE(free_space < paste_size,
+	       "vs-10175: not enough free space: needed %d, available %d",
+	       paste_size, free_space);
+
+#ifdef CONFIG_REISERFS_CHECK
+	if (zeros_number > paste_size) {
+		struct super_block *sb = NULL;
+		if (bi && bi->tb)
+			sb = bi->tb->tb_sb;
+		print_cur_tb("10177");
+		reiserfs_panic(sb, "vs-10177",
+			       "zeros_number == %d, paste_size == %d",
+			       zeros_number, paste_size);
+	}
+#endif				/* CONFIG_REISERFS_CHECK */
+
+	/* item to be appended */
+	ih = item_head(bh, affected_item_num);
+
+	last_loc = ih_location(&ih[nr - affected_item_num - 1]);
+	unmoved_loc = affected_item_num ? ih_location(ih - 1) : bh->b_size;
+
+	/* prepare space */
+	memmove(bh->b_data + last_loc - paste_size, bh->b_data + last_loc,
+		unmoved_loc - last_loc);
+
+	/* change locations */
+	for (i = affected_item_num; i < nr; i++)
+		put_ih_location(&ih[i - affected_item_num],
+				ih_location(&ih[i - affected_item_num]) -
+				paste_size);
+
+	if (body) {
+		if (!is_direntry_le_ih(ih)) {
+			if (!pos_in_item) {
+				/* shift data to right */
+				memmove(bh->b_data + ih_location(ih) +
+					paste_size,
+					bh->b_data + ih_location(ih),
+					ih_item_len(ih));
+				/* paste data in the head of item */
+				memset(bh->b_data + ih_location(ih), 0,
+				       zeros_number);
+				memcpy(bh->b_data + ih_location(ih) +
+				       zeros_number, body,
+				       paste_size - zeros_number);
+			} else {
+				memset(bh->b_data + unmoved_loc - paste_size, 0,
+				       zeros_number);
+				memcpy(bh->b_data + unmoved_loc - paste_size +
+				       zeros_number, body,
+				       paste_size - zeros_number);
+			}
+		}
+	} else
+		memset(bh->b_data + unmoved_loc - paste_size, '\0', paste_size);
+
+	put_ih_item_len(ih, ih_item_len(ih) + paste_size);
+
+	/* change free space */
+	set_blkh_free_space(blkh, free_space - paste_size);
+
+	do_balance_mark_leaf_dirty(bi->tb, bh, 0);
+
+	if (bi->bi_parent) {
+		struct disk_child *t_dc =
+		    B_N_CHILD(bi->bi_parent, bi->bi_position);
+		put_dc_size(t_dc, dc_size(t_dc) + paste_size);
+		do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
+	}
+}
+
+/*
+ * cuts DEL_COUNT entries beginning from FROM-th entry. Directory item
+ * does not have free space, so it moves DEHs and remaining records as
+ * necessary. Return value is size of removed part of directory item
+ * in bytes.
+ */
+static int leaf_cut_entries(struct buffer_head *bh,
+			    struct item_head *ih, int from, int del_count)
+{
+	char *item;
+	struct reiserfs_de_head *deh;
+	int prev_record_offset;	/* offset of record, that is (from-1)th */
+	char *prev_record;	/* */
+	int cut_records_len;	/* length of all removed records */
+	int i;
+
+	/*
+	 * make sure that item is directory and there are enough entries to
+	 * remove
+	 */
+	RFALSE(!is_direntry_le_ih(ih), "10180: item is not directory item");
+	RFALSE(ih_entry_count(ih) < from + del_count,
+	       "10185: item contains not enough entries: entry_count = %d, from = %d, to delete = %d",
+	       ih_entry_count(ih), from, del_count);
+
+	if (del_count == 0)
+		return 0;
+
+	/* first byte of item */
+	item = bh->b_data + ih_location(ih);
+
+	/* entry head array */
+	deh = B_I_DEH(bh, ih);
+
+	/*
+	 * first byte of remaining entries, those are BEFORE cut entries
+	 * (prev_record) and length of all removed records (cut_records_len)
+	 */
+	prev_record_offset =
+	    (from ? deh_location(&deh[from - 1]) : ih_item_len(ih));
+	cut_records_len = prev_record_offset /*from_record */  -
+	    deh_location(&deh[from + del_count - 1]);
+	prev_record = item + prev_record_offset;
+
+	/* adjust locations of remaining entries */
+	for (i = ih_entry_count(ih) - 1; i > from + del_count - 1; i--)
+		put_deh_location(&deh[i],
+				 deh_location(&deh[i]) -
+				 (DEH_SIZE * del_count));
+
+	for (i = 0; i < from; i++)
+		put_deh_location(&deh[i],
+				 deh_location(&deh[i]) - (DEH_SIZE * del_count +
+							  cut_records_len));
+
+	put_ih_entry_count(ih, ih_entry_count(ih) - del_count);
+
+	/* shift entry head array and entries those are AFTER removed entries */
+	memmove((char *)(deh + from),
+		deh + from + del_count,
+		prev_record - cut_records_len - (char *)(deh + from +
+							 del_count));
+
+	/* shift records, those are BEFORE removed entries */
+	memmove(prev_record - cut_records_len - DEH_SIZE * del_count,
+		prev_record, item + ih_item_len(ih) - prev_record);
+
+	return DEH_SIZE * del_count + cut_records_len;
+}
+
+/*
+ * when cut item is part of regular file
+ *      pos_in_item - first byte that must be cut
+ *      cut_size - number of bytes to be cut beginning from pos_in_item
+ *
+ * when cut item is part of directory
+ *      pos_in_item - number of first deleted entry
+ *      cut_size - count of deleted entries
+ */
+void leaf_cut_from_buffer(struct buffer_info *bi, int cut_item_num,
+			  int pos_in_item, int cut_size)
+{
+	int nr;
+	struct buffer_head *bh = bi->bi_bh;
+	struct block_head *blkh;
+	struct item_head *ih;
+	int last_loc, unmoved_loc;
+	int i;
+
+	blkh = B_BLK_HEAD(bh);
+	nr = blkh_nr_item(blkh);
+
+	/* item head of truncated item */
+	ih = item_head(bh, cut_item_num);
+
+	if (is_direntry_le_ih(ih)) {
+		/* first cut entry () */
+		cut_size = leaf_cut_entries(bh, ih, pos_in_item, cut_size);
+		if (pos_in_item == 0) {
+			/* change key */
+			RFALSE(cut_item_num,
+			       "when 0-th enrty of item is cut, that item must be first in the node, not %d-th",
+			       cut_item_num);
+			/* change item key by key of first entry in the item */
+			set_le_ih_k_offset(ih, deh_offset(B_I_DEH(bh, ih)));
+		}
+	} else {
+		/* item is direct or indirect */
+		RFALSE(is_statdata_le_ih(ih), "10195: item is stat data");
+		RFALSE(pos_in_item && pos_in_item + cut_size != ih_item_len(ih),
+		       "10200: invalid offset (%lu) or trunc_size (%lu) or ih_item_len (%lu)",
+		       (long unsigned)pos_in_item, (long unsigned)cut_size,
+		       (long unsigned)ih_item_len(ih));
+
+		/* shift item body to left if cut is from the head of item */
+		if (pos_in_item == 0) {
+			memmove(bh->b_data + ih_location(ih),
+				bh->b_data + ih_location(ih) + cut_size,
+				ih_item_len(ih) - cut_size);
+
+			/* change key of item */
+			if (is_direct_le_ih(ih))
+				set_le_ih_k_offset(ih,
+						   le_ih_k_offset(ih) +
+						   cut_size);
+			else {
+				set_le_ih_k_offset(ih,
+						   le_ih_k_offset(ih) +
+						   (cut_size / UNFM_P_SIZE) *
+						   bh->b_size);
+				RFALSE(ih_item_len(ih) == cut_size
+				       && get_ih_free_space(ih),
+				       "10205: invalid ih_free_space (%h)", ih);
+			}
+		}
+	}
+
+	/* location of the last item */
+	last_loc = ih_location(&ih[nr - cut_item_num - 1]);
+
+	/* location of the item, which is remaining at the same place */
+	unmoved_loc = cut_item_num ? ih_location(ih - 1) : bh->b_size;
+
+	/* shift */
+	memmove(bh->b_data + last_loc + cut_size, bh->b_data + last_loc,
+		unmoved_loc - last_loc - cut_size);
+
+	/* change item length */
+	put_ih_item_len(ih, ih_item_len(ih) - cut_size);
+
+	if (is_indirect_le_ih(ih)) {
+		if (pos_in_item)
+			set_ih_free_space(ih, 0);
+	}
+
+	/* change locations */
+	for (i = cut_item_num; i < nr; i++)
+		put_ih_location(&ih[i - cut_item_num],
+				ih_location(&ih[i - cut_item_num]) + cut_size);
+
+	/* size, free space */
+	set_blkh_free_space(blkh, blkh_free_space(blkh) + cut_size);
+
+	do_balance_mark_leaf_dirty(bi->tb, bh, 0);
+
+	if (bi->bi_parent) {
+		struct disk_child *t_dc;
+		t_dc = B_N_CHILD(bi->bi_parent, bi->bi_position);
+		put_dc_size(t_dc, dc_size(t_dc) - cut_size);
+		do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
+	}
+}
+
+/* delete del_num items from buffer starting from the first'th item */
+static void leaf_delete_items_entirely(struct buffer_info *bi,
+				       int first, int del_num)
+{
+	struct buffer_head *bh = bi->bi_bh;
+	int nr;
+	int i, j;
+	int last_loc, last_removed_loc;
+	struct block_head *blkh;
+	struct item_head *ih;
+
+	RFALSE(bh == NULL, "10210: buffer is 0");
+	RFALSE(del_num < 0, "10215: del_num less than 0 (%d)", del_num);
+
+	if (del_num == 0)
+		return;
+
+	blkh = B_BLK_HEAD(bh);
+	nr = blkh_nr_item(blkh);
+
+	RFALSE(first < 0 || first + del_num > nr,
+	       "10220: first=%d, number=%d, there is %d items", first, del_num,
+	       nr);
+
+	if (first == 0 && del_num == nr) {
+		/* this does not work */
+		make_empty_node(bi);
+
+		do_balance_mark_leaf_dirty(bi->tb, bh, 0);
+		return;
+	}
+
+	ih = item_head(bh, first);
+
+	/* location of unmovable item */
+	j = (first == 0) ? bh->b_size : ih_location(ih - 1);
+
+	/* delete items */
+	last_loc = ih_location(&ih[nr - 1 - first]);
+	last_removed_loc = ih_location(&ih[del_num - 1]);
+
+	memmove(bh->b_data + last_loc + j - last_removed_loc,
+		bh->b_data + last_loc, last_removed_loc - last_loc);
+
+	/* delete item headers */
+	memmove(ih, ih + del_num, (nr - first - del_num) * IH_SIZE);
+
+	/* change item location */
+	for (i = first; i < nr - del_num; i++)
+		put_ih_location(&ih[i - first],
+				ih_location(&ih[i - first]) + (j -
+								 last_removed_loc));
+
+	/* sizes, item number */
+	set_blkh_nr_item(blkh, blkh_nr_item(blkh) - del_num);
+	set_blkh_free_space(blkh,
+			    blkh_free_space(blkh) + (j - last_removed_loc +
+						     IH_SIZE * del_num));
+
+	do_balance_mark_leaf_dirty(bi->tb, bh, 0);
+
+	if (bi->bi_parent) {
+		struct disk_child *t_dc =
+		    B_N_CHILD(bi->bi_parent, bi->bi_position);
+		put_dc_size(t_dc,
+			    dc_size(t_dc) - (j - last_removed_loc +
+					     IH_SIZE * del_num));
+		do_balance_mark_internal_dirty(bi->tb, bi->bi_parent, 0);
+	}
+}
+
+/*
+ * paste new_entry_count entries (new_dehs, records) into position
+ * before to item_num-th item
+ */
+void leaf_paste_entries(struct buffer_info *bi,
+			int item_num,
+			int before,
+			int new_entry_count,
+			struct reiserfs_de_head *new_dehs,
+			const char *records, int paste_size)
+{
+	struct item_head *ih;
+	char *item;
+	struct reiserfs_de_head *deh;
+	char *insert_point;
+	int i, old_entry_num;
+	struct buffer_head *bh = bi->bi_bh;
+
+	if (new_entry_count == 0)
+		return;
+
+	ih = item_head(bh, item_num);
+
+	/*
+	 * make sure, that item is directory, and there are enough
+	 * records in it
+	 */
+	RFALSE(!is_direntry_le_ih(ih), "10225: item is not directory item");
+	RFALSE(ih_entry_count(ih) < before,
+	       "10230: there are no entry we paste entries before. entry_count = %d, before = %d",
+	       ih_entry_count(ih), before);
+
+	/* first byte of dest item */
+	item = bh->b_data + ih_location(ih);
+
+	/* entry head array */
+	deh = B_I_DEH(bh, ih);
+
+	/* new records will be pasted at this point */
+	insert_point =
+	    item +
+	    (before ? deh_location(&deh[before - 1])
+	     : (ih_item_len(ih) - paste_size));
+
+	/* adjust locations of records that will be AFTER new records */
+	for (i = ih_entry_count(ih) - 1; i >= before; i--)
+		put_deh_location(&deh[i],
+				 deh_location(&deh[i]) +
+				 (DEH_SIZE * new_entry_count));
+
+	/* adjust locations of records that will be BEFORE new records */
+	for (i = 0; i < before; i++)
+		put_deh_location(&deh[i],
+				 deh_location(&deh[i]) + paste_size);
+
+	old_entry_num = ih_entry_count(ih);
+	put_ih_entry_count(ih, ih_entry_count(ih) + new_entry_count);
+
+	/* prepare space for pasted records */
+	memmove(insert_point + paste_size, insert_point,
+		item + (ih_item_len(ih) - paste_size) - insert_point);
+
+	/* copy new records */
+	memcpy(insert_point + DEH_SIZE * new_entry_count, records,
+	       paste_size - DEH_SIZE * new_entry_count);
+
+	/* prepare space for new entry heads */
+	deh += before;
+	memmove((char *)(deh + new_entry_count), deh,
+		insert_point - (char *)deh);
+
+	/* copy new entry heads */
+	deh = (struct reiserfs_de_head *)((char *)deh);
+	memcpy(deh, new_dehs, DEH_SIZE * new_entry_count);
+
+	/* set locations of new records */
+	for (i = 0; i < new_entry_count; i++) {
+		put_deh_location(&deh[i],
+				 deh_location(&deh[i]) +
+				 (-deh_location
+				  (&new_dehs[new_entry_count - 1]) +
+				  insert_point + DEH_SIZE * new_entry_count -
+				  item));
+	}
+
+	/* change item key if necessary (when we paste before 0-th entry */
+	if (!before) {
+		set_le_ih_k_offset(ih, deh_offset(new_dehs));
+	}
+#ifdef CONFIG_REISERFS_CHECK
+	{
+		int prev, next;
+		/* check record locations */
+		deh = B_I_DEH(bh, ih);
+		for (i = 0; i < ih_entry_count(ih); i++) {
+			next =
+			    (i <
+			     ih_entry_count(ih) -
+			     1) ? deh_location(&deh[i + 1]) : 0;
+			prev = (i != 0) ? deh_location(&deh[i - 1]) : 0;
+
+			if (prev && prev <= deh_location(&deh[i]))
+				reiserfs_error(sb_from_bi(bi), "vs-10240",
+					       "directory item (%h) "
+					       "corrupted (prev %a, "
+					       "cur(%d) %a)",
+					       ih, deh + i - 1, i, deh + i);
+			if (next && next >= deh_location(&deh[i]))
+				reiserfs_error(sb_from_bi(bi), "vs-10250",
+					       "directory item (%h) "
+					       "corrupted (cur(%d) %a, "
+					       "next %a)",
+					       ih, i, deh + i, deh + i + 1);
+		}
+	}
+#endif
+
+}