On Mon, 22 May 2000, Ingo Oeser wrote:

I thought encryption should be done before calling brw_page() in 
mm/page_io.c:rw_swap_page_base()

only in the write case of course.

and decryption in fs/buffer.c:after_unlock_page(), if the
page->count is >0 after passing every other of the tests in this
function.

If the page->count during swapping is zero then it's going to be a
bug. You shouldn't need to check the page count.

So when is a page actually considered written to disk and when is
it accessed first after this? 

Of course you have to encrypt on a kind of bounce page, not on the swap
cache. While decrypting you can decrypt in place instead.

I have also problems tracking reads vs. writes, because this

I see. You can probably check if the page is uptodate or not to know if
it's a read or a write during disk completation.

Andrea

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