Method make_path_string

src/mds/CInode.cc:1095–1128

* Because a non-directory inode may have multiple links, the use_parent * argument allows selecting which parent to use for path construction. This * argument is only meaningful for the final component (i.e. the first of the * nested calls) because directories cannot have multiple hard links. If * use_parent is NULL and projected is true, the primary parent's projected * inode is used all the

 * generate full path.
 */
void CInode::make_path_string(string& s, bool projected,
			      const CDentry *use_parent,
			      int path_comp_count) const
{
  if (!use_parent) {
    use_parent = projected ? get_projected_parent_dn() : parent;
  }

  if (use_parent) {
    if (path_comp_count == -1) {
      use_parent->make_path_string(s, projected, path_comp_count);
    } else if (path_comp_count >= 1) {
      --path_comp_count;
      use_parent->make_path_string(s, projected, path_comp_count);
    } else if (path_comp_count == 0) {
      // this indicates that path has been shortened.
      s = "...";
      return;
    }
  } else if (is_root()) {
    s = "";
  } else if (is_mdsdir()) {
    char t[40];
    uint64_t eino(ino());
    eino -= MDS_INO_MDSDIR_OFFSET;
    snprintf(t, sizeof(t), "~mds%" PRId64, eino);
    s = t;
  } else {
    char n[40];
    uint64_t eino(ino());
    snprintf(n, sizeof(n), "#%" PRIx64, eino);
    s += n;
  }
}

/* XXX Generating more than 10 components of a path for printing in logs will
 * consume too much time when the path is too long (imagine a path with 2000