Comment by simcop2387

Definitely agree there. But it's also not always a good idea if you're going to do a lot of writes and rewrites to the same area of a file. If you're doing something more write once or a log append type pattern it won't make a difference usually. But if you're changing data a lot before closing/finishing the file then you might not want the dramatic performance change that O_SYNC can bring, and the race between fsync and close might still be worth it (esp if you're doing an fsync on all the directories involved to ensure metadata is commited too).