Re: O_DIRECT question

[Bodo Eggert]

Bill Davidsen <davidsen@xxxxxxx> wrote:

> My point is, that there is code to handle sparse data now, without
> O_DIRECT involved, and if O_DIRECT bypasses that, it's not a problem
> with the idea of O_DIRECT, the kernel has a security problem.

The idea of O_DIRECT is to bypass the pagecache, and the pagecache is what
provides the security against reading someone else's data using sparse
files or partial-block-IO.
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