From mboxrd@z Thu Jan  1 00:00:00 1970
From: freeman.zhang1992@gmail.com (Freeman Zhang)
Date: Fri, 07 Mar 2014 10:34:18 +0800
Subject: how to deal with page
In-Reply-To: <CAHPoDxKFR3Grn0gwQOAJqjBY6jm6hs-tLyzj2sCevsHW5Upo0Q@mail.gmail.com>
References: <CAHPoDxKFR3Grn0gwQOAJqjBY6jm6hs-tLyzj2sCevsHW5Upo0Q@mail.gmail.com>
Message-ID: <5319302A.9030409@gmail.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

Hi,

 2014-03-06 17:20 ???:
> Hi. nowdays i am studing Transparent encryption in linux system. when
> reading file needs do_generic_file_read function decrpty file. but in
> do_generic_file_read Physical data using struct page ,how did i use
> page decrpty.
Maybe you need to do en/decryption in the address_space operations,
which is used with struct page. The do_generic_file_read will evoke the
page->mapping->a_ops->readpage, and the readpage is  one of the
address_space operations. So I guess that's what you want.
Hope this can help!



Regards,
Freeman Zhang