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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [reiserfs/] [lbalance.c] - Blame information for rev 1765

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/*
 * Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README
 */
 
#include <linux/config.h>
#include <asm/uaccess.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/reiserfs_fs.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 = 0;
    }
 
    /* 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 (0, "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 = 0;
        dest_bi->bi_position = 0;
        *first_last = LAST_TO_FIRST;
        break;
 
    default:
        reiserfs_panic (0, "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, 0);
 
  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, 0);
 
  /* 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 ( 0, "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 neccessary (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)\n",
                          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)\n",
                          ih, i, deh + i, deh + i + 1);
    }
  }
#endif
 
}
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [reiserfs/] [lbalance.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README`
3			`*/`
4
5			`#include <linux/config.h>`
6			`#include <asm/uaccess.h>`
7			`#include <linux/string.h>`
8			`#include <linux/sched.h>`
9			`#include <linux/reiserfs_fs.h>`
10
11			`/* these are used in do_balance.c */`
12
13			`/* leaf_move_items`
14			`leaf_shift_left`
15			`leaf_shift_right`
16			`leaf_delete_items`
17			`leaf_insert_into_buf`
18			`leaf_paste_in_buffer`
19			`leaf_cut_from_buffer`
20			`leaf_paste_entries`
21			`*/`
22
23
24			`/* copy copy_count entries from source directory item to dest buffer (creating new item if needed) */`
25			`static void leaf_copy_dir_entries (struct buffer_info * dest_bi, struct buffer_head * source,`
26			`int last_first, int item_num, int from, int copy_count)`
27			`{`
28			`struct buffer_head * dest = dest_bi->bi_bh;`
29			`int item_num_in_dest; /* either the number of target item,`
30			`or if we must create a new item,`
31			`the number of the item we will`
32			`create it next to */`
33			`struct item_head * ih;`
34			`struct reiserfs_de_head * deh;`
35			`int copy_records_len; /* length of all records in item to be copied */`
36			`char * records;`
37
38			`ih = B_N_PITEM_HEAD (source, item_num);`
39
40			`RFALSE( !is_direntry_le_ih (ih), "vs-10000: item must be directory item");`