Corruption caused by umount not flushing the buffer cache.

[Alan Cox]

> It is not as you say "my caches flushing". It is "our caches flushing".
> Unmounting a file-system must force all pending I/O operations to the
> mounted device to complete.

He's talking about reads not writes.

> You cannot make changes in the behavior of a Linux, that divorce it
> completely from the Historical behavior of Unix.

I can't find anything  in the posix or SuS about this. In fact I can't find
anything in the V7 manual about it either.

Its quite valid for non-removable media to keep the data cached


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