Add support for with empty directory blocks in 64k blocksize filesystems

The rec_len field in the directory entry is 16 bits, so if the
filesystem is completely empty, rec_len of 0 is used to designate
65536, for the case where the directory entry takes the entire 64k
block.

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