AFFS preallocates few blocks per inode as an optimisation. Unfortunately
there is a race condition and the same blocks ends up being allocated
for both data and metadata, metadata gets overwritten and so the file is
partially unreadable. Here is a fix.
Please indicate if this isn't the right place to submit this or my
previous fs-related patches.

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko