Enable e2fsck to use the tdb library to store the dirinfo abstraction

If e2fsck.conf configures a scratch_files directory which is available,
and the number of directories exceeds scratch_files.numdirs_threshold,
then try to use the tdb library to store the directory information
abstraction.  This allows us to check very large filesystems without
needing as much physical memory.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2 files changed