Log files are opened using O_DIRECT causing problems if block size != 512

open("./ib_logfile0", O_RDWR)           = 3

fcntl(3, F_SETFL, O_RDONLY|O_DIRECT)    = 0

strace ./mysqld --innodb_flush_method=O_DIRECT >& /tmp/log

read(8, "\0\0\0\0\0\0\4\f\0\0\0\1\6\303\247\326\4\306E\326\1\0\0\0\377\377\377\377\377\377\377\377"..., 512, 512) = 512