Exemple #1
0
NAMED *hashTableLookup(HASH_TABLE *table, KEY name, size_t createSize)
{
  size_t i;
  if (table->size == 0) {
    if (!createSize)
      return 0;
    table->v = calloc(INIT_SIZE, sizeof(NAMED *));
    if (!table->v)
      return 0;
    table->size = INIT_SIZE;
    table->usedLim = INIT_SIZE / 2;
    i = hash(name) & (table->size - 1);
  }
  else {
    unsigned long h = hash(name);
    for (i = h & (table->size - 1);
         table->v[i];
         i == 0 ? i = table->size - 1 : --i) {
      if (keyeq(name, table->v[i]->name))
	return table->v[i];
    }
    if (!createSize)
      return 0;
    if (table->used == table->usedLim) {
      /* check for overflow */
      size_t newSize = table->size * 2;
      NAMED **newV = calloc(newSize, sizeof(NAMED *));
      if (!newV)
	return 0;
      for (i = 0; i < table->size; i++)
	if (table->v[i]) {
	  size_t j;
	  for (j = hash(table->v[i]->name) & (newSize - 1);
	       newV[j];
	       j == 0 ? j = newSize - 1 : --j)
	    ;
	  newV[j] = table->v[i];
	}
      free(table->v);
      table->v = newV;
      table->size = newSize;
      table->usedLim = newSize/2;
      for (i = h & (table->size - 1);
	   table->v[i];
	   i == 0 ? i = table->size - 1 : --i)
	;
    }
  }
  table->v[i] = calloc(1, createSize);
  if (!table->v[i])
    return 0;
  table->v[i]->name = name;
  (table->used)++;
  return table->v[i];
}
Exemple #2
0
/**
 * reiser4_replace_extent - replace extent and paste 1 or 2 after it
 * @un_extent: coordinate of extent to be overwritten
 * @lh: need better comment
 * @key: need better comment
 * @exts_to_add: data prepared for insertion into tree
 * @replace: need better comment
 * @flags: need better comment
 * @return_insert_position: need better comment
 *
 * Overwrites one extent, pastes 1 or 2 more ones after overwritten one.  If
 * @return_inserted_position is 1 - @un_extent and @lh are returned set to
 * first of newly inserted units, if it is 0 - @un_extent and @lh are returned
 * set to extent which was overwritten.
 */
int reiser4_replace_extent(struct replace_handle *h,
                           int return_inserted_position)
{
    int result;
    znode *orig_znode;
    /*ON_DEBUG(reiser4_extent orig_ext);*/	/* this is for debugging */

    assert("vs-990", coord_is_existing_unit(h->coord));
    assert("vs-1375", znode_is_write_locked(h->coord->node));
    assert("vs-1426", extent_get_width(&h->overwrite) != 0);
    assert("vs-1427", extent_get_width(&h->new_extents[0]) != 0);
    assert("vs-1427", ergo(h->nr_new_extents == 2,
                           extent_get_width(&h->new_extents[1]) != 0));

    /* compose structure for paste */
    init_new_extent(&h->item, &h->new_extents[0], h->nr_new_extents);

    coord_dup(&h->coord_after, h->coord);
    init_lh(&h->lh_after);
    copy_lh(&h->lh_after, h->lh);
    reiser4_tap_init(&h->watch, &h->coord_after, &h->lh_after, ZNODE_WRITE_LOCK);
    reiser4_tap_monitor(&h->watch);

    ON_DEBUG(h->orig_ext = *extent_by_coord(h->coord));
    orig_znode = h->coord->node;

#if REISER4_DEBUG
    /* make sure that key is set properly */
    unit_key_by_coord(h->coord, &h->tmp);
    set_key_offset(&h->tmp,
                   get_key_offset(&h->tmp) +
                   extent_get_width(&h->overwrite) * current_blocksize);
    assert("vs-1080", keyeq(&h->tmp, &h->paste_key));
#endif

    /* set insert point after unit to be replaced */
    h->coord->between = AFTER_UNIT;

    result = insert_into_item(h->coord, return_inserted_position ? h->lh : NULL,
                              &h->paste_key, &h->item, h->flags);
    if (!result) {
        /* now we have to replace the unit after which new units were
           inserted. Its position is tracked by @watch */
        reiser4_extent *ext;
        znode *node;

        node = h->coord_after.node;
        if (node != orig_znode) {
            coord_clear_iplug(&h->coord_after);
            result = zload(node);
        }

        if (likely(!result)) {
            ext = extent_by_coord(&h->coord_after);

            assert("vs-987", znode_is_loaded(node));
            assert("vs-988", !memcmp(ext, &h->orig_ext, sizeof(*ext)));

            /* overwrite extent unit */
            memcpy(ext, &h->overwrite, sizeof(reiser4_extent));
            znode_make_dirty(node);

            if (node != orig_znode)
                zrelse(node);

            if (return_inserted_position == 0) {
                /* coord and lh are to be set to overwritten
                   extent */
                assert("vs-1662",
                       WITH_DATA(node, !memcmp(&h->overwrite,
                                               extent_by_coord(
                                                   &h->coord_after),
                                               sizeof(reiser4_extent))));

                *h->coord = h->coord_after;
                done_lh(h->lh);
                copy_lh(h->lh, &h->lh_after);
            } else {
                /* h->coord and h->lh are to be set to first of
                   inserted units */
                assert("vs-1663",
                       WITH_DATA(h->coord->node,
                                 !memcmp(&h->new_extents[0],
                                         extent_by_coord(h->coord),
                                         sizeof(reiser4_extent))));
                assert("vs-1664", h->lh->node == h->coord->node);
            }
        }
    }
    reiser4_tap_done(&h->watch);

    return result;
}