Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1222 insertions, 0 deletions

diff --git a/fs/reiserfs/lbalance.c b/fs/reiserfs/lbalance.c
new file mode 100644
index 000000000000..2406608fc5cd
--- /dev/null
+++ b/fs/reiserfs/lbalance.c
@@ -0,0 +1,1222 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/config.h>
+#include <asm/uaccess.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/reiserfs_fs.h>
+#include <linux/buffer_head.h>
+
+/* these are used in do_balance.c */
+
+/* leaf_move_items
+   leaf_shift_left
+   leaf_shift_right
+   leaf_delete_items
+   leaf_insert_into_buf
+   leaf_paste_in_buffer
+   leaf_cut_from_buffer
+   leaf_paste_entries
+   */
+
+
+/* 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;
+    int item_num_in_dest;               /* 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 */
+    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 = B_N_PITEM_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, B_N_PKEY (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 < I_ENTRY_COUNT(ih)) {
+                set_le_ih_k_offset( &new_ih, deh_offset( &(deh[from]) ) );
+                /*memcpy (&new_ih.ih_key.k_offset, &deh[from].deh_offset, SHORT_KEY_SIZE);*/
+            } 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->bi_bh, item_num_in_dest,
+                        (last_first == FIRST_TO_LAST) ? I_ENTRY_COUNT(B_N_PITEM_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;
+  int dest_nr_item, src_nr_item; /* number of items in the source and destination buffers */
+  struct item_head * ih;
+  struct item_head * dih;
+  
+  dest_nr_item = B_NR_ITEMS(dest);
+  
+  if ( last_first == FIRST_TO_LAST ) {
+    /* 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 */
+    ih = B_N_PITEM_HEAD (src, 0);
+    dih = B_N_PITEM_HEAD (dest, dest_nr_item - 1);
+    if (!dest_nr_item || (!op_is_left_mergeable (&(ih->ih_key), src->b_size)))
+      /* there is nothing to merge */
+      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 (NULL, "vs-10020: leaf_copy_boundary_item: "
+                          "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, B_I_PITEM(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 = B_N_PITEM_HEAD (src, src_nr_item - 1);
+  dih = B_N_PITEM_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)) {
+    if ( bytes_or_entries == -1 )
+      /* bytes_or_entries = entries number in last item body of SOURCE */
+      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, B_I_PITEM(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 = B_N_PITEM_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, B_N_PITEM_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, B_N_PITEM(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 ) */
+        if (is_direntry_le_ih (ih = B_N_PITEM_HEAD(src,item_num)))
+            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, B_N_PITEM (src, item_num), 0);
+        }
+    } else {
+        /*  if ( if item in position item_num in buffer SOURCE is directory item ) */
+        if (is_direntry_le_ih(ih = B_N_PITEM_HEAD (src, item_num)))
+            leaf_copy_dir_entries (dest_bi, src, LAST_TO_FIRST, item_num, I_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, SHORT_KEY_SIZE);
+
+            n_ih.ih_version = ih->ih_version; /* JDM Endian safe, both le */
+
+            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 );
+
+            n_ih.ih_version = ih->ih_version; /* JDM Endian safe, both le */
+
+            leaf_insert_into_buf (dest_bi, 0, &n_ih, B_N_PITEM(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_bi->bi_position = PATH_H_B_ITEM_ORDER (tb->tb_path, 0);     /* src->b_item_order */
+        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 (NULL, "vs-10250: leaf_define_dest_src_infos: shift type is unknown (%d)", shift_mode);
+    }
+    RFALSE( src_bi->bi_bh == 0 || dest_bi->bi_bh == 0,
+            "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 ) {
+    if (B_NR_ITEMS (S0) == 0) { /* number of items in S[0] == 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: leaf_shift_left: 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 (B_N_PITEM_HEAD (S0, 0))
+                && !I_ENTRY_COUNT (B_N_PITEM_HEAD (S0, 0)))) &&
+              (!op_is_left_mergeable (B_N_PKEY (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
+        )
+{
+  //  struct buffer_head * S0 = PATH_PLAST_BUFFER (tb->tb_path);
+  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);
+
+            if (is_direntry_le_ih (ih = B_N_PITEM_HEAD(bh, B_NR_ITEMS(bh)-1)))  /* 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 * inserted_item_ih,
+                           const char * 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 = B_N_PITEM_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) {
+        print_cur_tb ("10177");
+        reiserfs_panic ( NULL, "vs-10177: leaf_paste_in_buffer: ero number == %d, paste_size == %d",
+                         zeros_number, paste_size);
+    }
+#endif /* CONFIG_REISERFS_CHECK */
+
+
+    /* item to be appended */
+    ih = B_N_PITEM_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( I_ENTRY_COUNT(ih) < from + del_count,
+          "10185: item contains not enough entries: entry_cout = %d, from = %d, to delete = %d",
+          I_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 = I_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 = B_N_PITEM_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)));
+            /*memcpy (&ih->ih_key.k_offset, &(B_I_DEH (bh, ih)->deh_offset), SHORT_KEY_SIZE);*/
+            }
+    } 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 = B_N_PITEM_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_head * bh,
+                        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;
+
+    if (new_entry_count == 0)
+        return;
+
+    ih = B_N_PITEM_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( I_ENTRY_COUNT (ih) < before,
+          "10230: there are no entry we paste entries before. entry_count = %d, before = %d",
+          I_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 = I_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 = I_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));
+/*      memcpy (&ih->ih_key.k_offset, 
+                       &new_dehs->deh_offset, SHORT_KEY_SIZE);*/
+    }
+
+#ifdef CONFIG_REISERFS_CHECK
+  {
+    int prev, next;
+    /* check record locations */
+    deh = B_I_DEH (bh, ih);
+    for (i = 0; i < I_ENTRY_COUNT(ih); i ++) {
+      next = (i < I_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_warning (NULL, "vs-10240: leaf_paste_entries: directory item (%h) corrupted (prev %a, cur(%d) %a)",
+                          ih, deh + i - 1, i, deh + i);
+      if (next && next >= deh_location( &(deh[i])))
+        reiserfs_warning (NULL, "vs-10250: leaf_paste_entries: directory item (%h) corrupted (cur(%d) %a, next %a)",
+                          ih, i, deh + i, deh + i + 1);
+    }
+  }
+#endif
+
+}