Re: [Help] How to Replace File Operations in File System?

[freeman <freeman.zhang1992@xxxxxxxxx>]

Hi Rishi,

With pleasure!
You can check it on https://github.com/freemandealer/droidcry
on your convenience.

 2014-02-19 23:17, Rishi Agrawal :

Good that you solved it your self, still if you can send me the idea on which you are working - I may also learn something.

On Tue, Feb 18, 2014 at 10:04 AM, freeman <freeman.zhang1992@xxxxxxxxx> wrote:

> Hi

>
> The operations will not change back until your object gets destroyed,
> whatever be the type of the object.
>
> Caching will not cause any issue here.
>
> Maybe if you can send the code we can have a look at it.
>
>
> --
> Regards,
> Rishi Agrawal

Hi Rishi,

It's very nice of you willing to help check my code!
I'm now very excited － problem solved!

I spent half a day beautifying my code yesterday (so that it won't annoy
you
that much), and find there is a problem:

Every time there is a read/write system call, I saved the lower file ops
and
address space ops. In their replacement(upper operations), I invoked
lower ones.
There's a possibility that it might saved the upper operations as lower
ones if I
open them twice in a short time. At this point, upper operation invoke
itself!
So I check the operations before truly save and replace them and, it works!

Thanks to you and all the amazing people in this amazing list that
helped me,
now I get both wrapfs and my own non-filesystem module functional for my
future work on transparent encryption, and most importantly, I've
learned and
enjoyed a lot!

Regards
Freeman Zhang

--
Regards,
Rishi Agrawal

Regards
Freeman Zhang

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