修剪内存的函数trim_cache()

hjwsm1989

void Client::trim_cache()
{
  unsigned last = 0;
  while (lru.lru_get_size() != last) {
    last = lru.lru_get_size();

    if (lru.lru_get_size() <= lru.lru_get_max())  break;

    // trim!
    Dentry *dn = (Dentry*)lru.lru_expire();
    if (!dn) break;  // done
   
    dout(15) << "trim_cache unlinking dn " << dn->name
             << " in dir " << hex << dn->dir->parent_inode->ino
             << dendl;
    if (dn->dir->parent_inode->flags & I_COMPLETE) {
      dout(10) << " clearing I_COMPLETE on " << *dn->dir->parent_inode << dendl;
      dn->dir->parent_inode->flags &= ~I_COMPLETE;
      dn->dir->release_count++;
    }
    unlink(dn);
  }

  // hose root?
  if (lru.lru_get_size() == 0 && root && root->ref == 0 && inode_map.size() == 1) {
    dout(15) << "trim_cache trimmed root " << root << dendl;
    delete root;
    root = 0;
    inode_map.clear();
  }
}

那位大虾能够帮帮忙解释啊……谢谢了