ext2fs: don't use O_DIRECT if not available

O_DIRECT is not defined on OSX.  Since direct IO is only a new
optimization and not needed for correct functionality, disable
it if O_DIRECT is unavailable.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed