From: Jakub Jermar <jermar@itbs.cz>

I found out that BFS filesystem will eventually try to read and interpret
garbage past the end of directory in bfs_add_entry().  If the garbage
(interpreted as i-node number) is not set to zero (does it have to be?)
bfs_add_entry() will consider it a regular directory entry. 

This causes weird things like this:
# touch a
# rm a
# ls
# touch b
# ls
a

My patch detects an attempt to read past the end of directory and explicitly
clears the garbage that represents i-node number.  Thus the correct behaviour
is achieved.

(was unable to contact Tigran)